YES! Found the Weirdest Problem! Now onto the Most Powerful Two Stroke!

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[@IFRYRCE]

TWO VIDEOS IN ONE WEEK! We are truly blessed by the creator of copious crankcase capacity. Glad to have you back

[@Hnkka]

YES

[@1celtickiwi]

Thats what I was thinking...hahahahaha

[@avocadoarms358]

If you looked at it like 2 videos over a 5 week hiatus it doesn’t look as good so imma go with the 2 videos a week also😂

[@waffleown4258]

I was just about to comment the same 😂

[@guerreroa85]

Same think I was thinking.

[@justindastar]

dude that smile when you figured out it was the exhaust made me feel good, such sweet relief.

[@lesenegalais]

And then just a moment later a perplexed WTF look that I think we all got too!

[@Thorbrook]

Absolutely loved the smile when the motor reved up. A Win

[@MrJermbob]

Whats dumb is everyone else knows its the exhaust and have suggested changing it a million times. 2 Stroke is all in the pipe.

[@MrJermbob]

@@Thorbrook I don't care about his head, don't bring feelings into the motor please. This is a logical process. If you know anything about a 2 stroke its all in the pipe. Every change he has made needed a change to the pipe. You can just tell he isn't prepared to enter in pipe making, being the only thing holding him back from the optimal pipe for the motor exactly as it is. One degree in exhaust duration changes so much in the pipe.

[@MrJermbob]

@@Thorbrook Ive been tuning and building small cc two strokes for almost 20 years. I do know a thing or two. My exhaust pipe calculations came from Fritz Overmars himself. I used those for figures he wants to use. His pipe is totally wrong.

[@capzsgarage]

Back in the Alex's garage for the 2nd time in a week... am I dreaming? Go on man, your passion and your work are an inspiration for everyone!

[@MrNursi]

Nice to see a smile on the thumbnail Alex :) I thought you must have found something major. Onwards and upwards!

[@90invalid]

my father had the same problem with ski-doo 670cc(ported and big bore), solved with longer pipe in the begining the rest was the same. all this years he worked with the snowmobile in the garage was crazy!!!!

[@painlessadventure]

Now you need to adapt some kind of Trombone exhaust that will compensate low to high rpm.

[@rubikmonat6589]

Yes, servo driven trombone exhaust is needed.

[@theshippingcontainergarage]

Water inject also changes temp and therefore pulse

[@Mdsoebee]

Yes! He can make this, i would love to see it work!

[@theshippingcontainergarage]

@@Mdsoebee I've only ever heard of this system but never seen it put into practice.

[@MrJermbob]

Easily done. The people he hung out with in germany did it already too.

[@kasper-jw2441]

great, its so nice to see for once other tuners struggling with weird problems with tuning and working on 2 strokes i always have the idea that everybody knows and does everything without problems, but when i am trying to make something better, or faster, or build something myself i encounter problems that nobody has it seems like. great video's, all the glamour and failures makes it real!

[@billjacobs8035]

Amen to that 👍

[@a64738]

If it is with computers, electronics or engines, cars and so on I always have trouble no other have. And when I call in the experts they say no problem I will fix this, they try for a hour or 2 and give up and say this is impossible and I end up having to fix it myself anyway even if I have no clue what I am doing most of the time....

[@kasper-jw2441]

@@a64738 Exactly, most of the time we are humbled by their over confident behavior, thinking they gonna absolute fix it, and then indeed 2 hours later be dissapointed by those people, i think most of the time these people learned a trick somewhere and they think it applies to every situation. Specialists, or people who went to school to work in certain field lack a lot of the times basic fundamentals about stuff and because of that they often tend to black and white solutions, if certain car has x problem it has to be that part broken, why? because it always brakes on these cars. i always had fights with my boss over this as an mechanic, i quit being a mechanic because of the dumb down technical part of it all. so if you want to be a mechanic, know that the sport is in how fast they can fix something, or rebuild something, and not about real problem solving or making something better.

[@bluestripes1]

@@a64738 i feel this lol, no shop will even take the job for most of the problems i encounter

[@paradiselost9946]

i just dont do anything for, from the minute i wake, til the moment i fall alseep... everything breaks, falls over, is stolen, is seized, is missing... the simplest jobs require a screw here, a run to the hardware shop there, a complete give up and order a proper one from the US and wait two months, blah blah blah then finally someone drops in and there goes there goes the rest of the weekend as you sit around and talk shit with nothing being done.

[@tomboxyz5564]

When I went to tune my custom made powervalve controler, the shop owner (who builds most of the race-winning engines in Poland) said there's lots of problems with ignitech and zeeltronic units, they are quite terrible with reliability... My powervalve controler prototype has so far done about 4500km on an enduro bike in varying conditions, not a single issue yet (and it allowed me to get a degree in engineering) I'm actually working on a programable CDI + powervalve controler unit

[@ph0end]

Problem solving is a process frequently fraught with moments of helplessness, and I think a lesser person would be more inclined to hide all of that, posting only the content where forward progress is made. Instead, it's great to see you showcase the _entire_ development of your work, unabashedly bringing us along for the ups and downs. Bravo Sir.

[@garytompkins2116]

Extremely pleased to see you didnt end up laying under your desk awaiting the sweet release of death again in this video 😂 Great progress 👍

[@daveandrews5861]

Congratulations Alex, I had a feeling you were about to give up! Glad to see your determination has shown good results. Well done sir.

[@nikopoznat2408]

HINT: dont use brake cleaner to find air leaks, instead use plain household window cleaner, it will bubble and show you exact place of leak. I use it all time when checking tig welds that need to hold pressure 😉 its clean and it will evaporate you dont have to wash it

[@saetastr]

Brake cleaner is used for vacuum leaks as it is sucked by the engine and it is flammable so you will notice a rise in rpm. Soap and water is better for leaks where there is some pressure that vent to the atmosphere (a tyre for example)

[@andrewshipp2739]

An engine is not a pressure vessel, it's sucking air. Far easier to spray something which the engine can actually run on, ie brake cleaner. You're not checking with your eyes, but your ears. You'll hear it run different if it's got a leak. I do it often at work, something with a high and erratic idle will often run really nice for a moment when showing brake clean on the area... Stops being lean all of a sudden. Crank seals, intake boots, carb gaskets etc

[@andrewshipp2739]

Also I just watched the video and realised you were taking about a pressure test. Never mind my comment above 😂

[@codeack101wlck]

Don't yall know he was using his eyes as a detector? The more the pain the closer to the leak you are from getting sprayed

[@RenaeRacer]

@@saetastr Nope! The rpm will fall when the brake cleaner hits the leak! Try it out ;)

[@tracious2295]

Variable exhaustport as they do on mx-bikes. My guess would be that the port together with the exhaust is breaking the ability to rev and get out of low rpm's. Keep up the good work mate!

[@richardwestcott5002]

Not many get to experience the feelings that come from solving problems by themselves. Very, very happy for you. And yes, 43 years of loving 2-strokes and not experienced that result 👍

[@Scissors69]

I have a 50cc road bike, in a high state of tune, which behaved similarly to yours. I cobbled up a butterfly valve in the header pipe, which I operate, for the time being, with the choke lever on the bars. The butterfly valve opens to another chamber of about 100cc, which is also adjustable in volume. It has worked so well in getting over the hump that I am in the process of making a better, permanent, job of it, with a 1/4 turn rotary valve, just like the Honda ATAC system (which is what gave me the idea) and controlling it with a stepper motor

[@paulburkey2]

I would make a slip fit expansion chamber so you can adjust it like a trombone to dial in the pulse timing. then weld one up maybe even a YPVS servo to change the exhaust timing for low and high RPM

[@vvveenn]

The ups and downs of this channel are just brilliant. I was not expecting the conclusion of this massively frustrating issue to be our old friend RESONANCE 😅

[@OddsandEndsMachining]

Great to see you get to the bottom of this, as well as making a bleed valve to kill the resonance, you could make some different length header inserts to test out different lengths as well.

[@sidecarbod1441]

Maybe some sort of pipe with a slip joint and some method of electronically/mechanically adjusting the length of the pipe? Anyway great news that you have found the issue. By the way I have often though that your intake holes in the casing for the disk valve should not be round, you would get better pulses and more time-area if they were more 'wedge' shaped, you could run a less aggressive intake timing figure and still get the required gas flow.

[@2smokes]

Yes i was looking at the ardyno pcb and he can do it with the ardyno pcb and an servo motor

[@EddieTheH]

I once saw an interesting low-tech arrangement on Derbi Senda once that used a lever off the throttle cable to shift the pipe. Was a heavy throttle but it worked pretty well. Can't remember the specifics of it but I'm sure someone else in internetland has probably done it too.

[@Garageratto]

I saw a video of 2t outboard motor with "moving"exhaust to change the pipe lenght for low and high rpm. Popped in my mind when you found the problem.

[@blsully]

@14:03 ... 2STROKE STUFFING, the tragicomedy. Thanks for bringing us along, even through the confusion and frustration. It's all educational and you've developed into a great story-teller with your videos!

[@blackjackjwh]

I'm so happy that you were able to source the problem. The struggle can be so frustrating at times. Can't wait to see how you improve it from here.

[@funone8716]

Methodical, calm, problem solving for the WIN! Many guys would be smashing things up by now.

[@2strokecarbtuningportingin187]

Over a year ago I would have smashed it up.

[@funone8716]

@@2strokecarbtuningportingin187 I would at least be drinking a LOT more Bourbon

[@sebastianharrison6118]

Your just so amazing thank you for doing all the hard work for us

[@Cutter_Number_30]

I know that feeling when chasing an issue and finally you find it in the strangest places. You are so happy but you also wantyo throw whatever part it is as far as you can at the same time. We'll done for sticking with it.

[@Jeffsa12]

Hang on, how many 2 strokes won't run except idle without the exhaust/expansion chamber As a former small engine mechanic, I can tell you none in that category. Perhaps in the highly tuned racing world, it is not unheard of? Could there be an issue in your engine design regarding cylinder scavenging? ie: crankcase volume compression ratio, port timing, port shape with regard to airflow patterns and direction: ie too much exhaust dilution, over scavenging that is creating a low pressure when the ports close, etc... ? It seems there is just not enough fuel/air mixture available in the cylinder compression stroke to accelerate off idle without introducing some kind of reflective wave back towards the exhaust. It seems strange to me how well it idles as well. Perhaps there is more engineering (pressure wave scavenging) that goes into an industrial grade and racing 2 strokes than meets the eye, and we take for granted?

[@extec101]

Try the pipe from the enderbike.

[@RotarySMP]

Sometimes it pays to be lucky. That was a pretty lucky discovery, as you offered up your pipe, but your perseverance led to your luck. Nice one.

[@markw2436]

It is all about resonance. Great to see you in your garage again and I really hope you are having a wonderful and balanced life.

[@crottemole]

I love the speechless pause you had! Happy that you finally found the main source of all these issue. Here's to the most powerful two stroke!

[@mattthemechanic931]

Glad to see you've found your root issue! The look of surprise and relief, when you realized the issue is relatable. Amazing how small things make such a difference in how the engine behaves. Looking forward to the next video!

[@kimkeam2094]

Tuned pipes are a real bugger to get right and hard to get all the available power. All the best with your calculations as you modify it. I found it was the hardest thing to get right on my 2 strokes, but also very rewarding when you get the results. Glad to see you back and all the best to your family.

[@AnonyMous-jf4lc]

So true. You always have to leave some room to play as the real world is never quite the same as the theoretical.

[@dalejrjunior1298]

yeah i had a pipe on my 99 cr125 i tuned up that i had to saw open and add some moor room into the chamber because it would choke the motor like his

[@malcrandall1309]

Alex. When the original stinger was fitted to this pipe it achieved 18300 revs and climbing while using the Roots blower.

[@jasonaldenhaley1]

The struggle has been real, 100% truth. Your perciverance is something to aspire to, my guy!!

[@wifiguy_nz]

MAGIC DUDE!!! 13:52 to 14:06 is one of the best moments watching your channel. Did anyone see some sparks coming out of his head.

[@ThePartsBin]

Is it finally time for a variable length exhaust?!😍

[@impuls60]

Another factor to res frequency is a choke/narrowing. A narrowing/restriction will also give the same effects as a longer tube. So a valve might the easy solution here.

[@malcrandall1309]

When this expansion chamber had the original stinger fitted it achieved 18300 RPM and climbing while using the roots blower. To me this indicates the original design worked.

[@johnwall1224]

Congrats on finding the problem the exhaust I didn’t see that coming I can’t wait to see what you come up with

[@swicked86]

So glad to see the process of success, it's not normally well documented at the failures. Your spirit is strong!

[@dougwhite3819]

Beautiful!! Just covered resonance in my physics class, once I learn more about how two stroke exhausts work I'll make watching this video a class assignment

[@mikeford5106]

I believe Honda [and others] during the two stroke GP days utilised an electronic "stepper motor" to vary the length of the exhaust header, [and also the inlet ] length?

[@a64738]

Hei :) Exhaust valve and variable length exhaust is for low rpm power, this only need to rev high and give max power so no need for neither. It only needs to be tuned for max power at high rpm which it should be able to do without need for low rpm power (it will need high idle speed to keep it running). Also many say in the comments that for max power at high rpm you need longer exhaust and expansion chamber, not shorter...

[@michellatour150]

In my experiences Motoseal / Yamabond takes more than 24 hours to cure. You should try applying it with a syringe instead of fingers, makes a even bead.

[@kylegeorgeson9436]

We used to use different length spacer pipes between the head flange and the chamber when I used to do kart racing. That might be an option to test for the pipe situation

[@yelyab1]

We have to assume that there is a pressure wave in the X chamber that is bouncing back right at the time the next slug of fuel/air is suppose to go into the cylinder. Makes sense but where did a low frequency resonance come from to jam up the whole motor as much as it did here. I like the idea of a trombone type tuning of the X-chamber. Good for making adjustments for temperature, humidity, and barometric pressure. My little 60cc bike motor X chamber use to get so hot it would turn cherry red on extend runs. Slide trombone might not stand up to temperature changes.

[@leandrogarra]

13:48 that face explain the two stroke engine. Jajaja. Well done man!

[@westsussexbushcraft812]

The look on your face was priceless! Good to see you back at this madness .

[@hunnybunnysheavymetalmusic6542]

If you could tune the exhaust in some way so that it was driven along with the throttle cable, or else with a flyweight governor. Something that can bring the length of the exhaust port in closer as the RPMs climb, and let it out when they drop.

[@jeremykonkle4571]

Watching you for yrs now. I'm actually living this with you and it's hella inspiring. Keep at you're so close!!!

[@Kyrazlan]

That look of disbelief when you realized it was the exhaust lmao. I'm so glad you found the problem after years of frustration.

[@stuartbradbury9514]

Never have i seen someone so elated and confused at the same time 😂. Honest this new find opens up so many different questions

[@lookronjon]

Hi Alex. Great investigation. I was thinking a cone inside the exhaust pipe just inside that will keep the pulse from entering the exhaust port. It reflect it back into the pipe. I don’t know. Some auto headers have that. Some way to reflect it so it’s not interfering. I think that a straight pipe might work now. No chamber at all. Just my thought. Cheers from fenders junction Colorado.

[@808bigisland]

Also small motors with aggressive valve timing have a high idle. Your normal idle might be somewhere between 4-5000 rpm. A low idle might not be possible.

[@smokinamby]

More like 2k rpms.

[@808bigisland]

@@smokinamby not on a single 2 stroke. My 125 Mito would idle around 3k when hot.

[@d.thorpe2046]

Canadian mechanic here: an alternative to expensive and poisonous brake clean for finding leaks, soapy water. Some dish soap and water in a spray bottle. No bubbles, no troubles.

[@oikkuoek]

On the old 2T power boats, they used telescopic exhaust to fix this problem. Could work here as well.

[@aidshusten240]

4:54 thats the reason i dont like slit screws and mostly avoid them...in the age of torx hex and phillips

[@arielsaeth]

try two pipes that slide into each other you can adjust the length of the pipe while running before the expansion chamber,making a sort of power valve . an easy experiment to do.

[@szymont1918]

Honey, 2STROKE STUFFING just posted, time to ingore what you were doing right now and watch it at all cost EDIT: Where is the music? I miss the calm jazz in the background... EDIT 2: 15:20 What about a two expansion chambers with a valve, so you can switch between low/medium rpm pipe and high rpm pipe? Also, Have you considered a sidebleed expansion chamber?

[@benjaminritter5286]

After years as a mechanic , I use to test every time the case for leaks . Block the exhaust and intake and make a Vakuum on the case . After this I had a lot less problems. I think you need to check this engine this way every time you open it .

[@billshiff2060]

THAT is one of the most interesting things I have seen. You need to simulate that pipe at low rpm to try to understand how destructive resonance is happening. COOL!

[@MaNNeRz91]

I comment again about the variable tuning exhaust that I had on an RC car a few years back. A piston inside the exhaust makes the expansion chamber bigger when pressure increases

[@joshmeyer5280]

Really enjoyed this video, i can really relate as a mechanic, the frustration of looking for a abnormal problem then finding it in a eureka moment LOL. Keep up the good work!!

[@darkhorsegarage9623]

The look when you held the pipe up to the header was priceless.

[@TheRzMike]

Haha love that face after the first rev! This is a huge win, you found the problem thats been haunting you in your dreams :D

[@claudio8955]

There have been rotary valve kart engines that revved high. The valve was built very thin so that it could bend and seal.

[@HighDefBNG]

HOORAAYY!!!!! 🥳 This is very exciting. So glad to see this milestone. The journey continues! Thank you 2SS

[@darylnicklen3685]

Congrats on the findings. That exhaust now a new direction let's hope this time you nailed it down. You determination is something I admire. Be well glad your back and seeing success.

[@AimlessMoto]

I'm pretty sure when the engine was still on the stand last year I mentioned needing to make a telescopic down tube to adjust where the expansion chamber was in the line... thanks for validating my theory!

[@kevinpayne3804]

Just an idea, but it seems like it's ingesting too much fresh air with the exhaust off, and not enough with the exhaust mounted? Might be time for a little experiment, like drilling a small hole in the exhaust and plumbing it to inject something like 3-5 PSI of fresh air into the exhaust??

[@cringram1003]

Alex a variable length center section expansion chamber is worth checking into. Seen them do miracles on go-karts, look into it.

[@tonyalto1014]

It may be that the pipe volume is too small. Dirt bike and snowmobile manufacturers went to ‘fat pipes’ back in the 80’s to help get through that low speed range and still have the right timing pulses at high RPM. Alexander Graham Bell formulae make very small volume pipes with pretty narrow (but high) Peak HP power bands. OR, mess with variable exhaust port height to get through the lower and mid RPM ranges. A lower ex port will help tremendously at lower rpm. Just thinkin’ out loud here. Thanks for the great videos!

[@taylorhappe4212]

I believe if you're trying to make this 2-stroke 50cc put as much power out as a 125 or at 200 or 250 maybe you should try a pipe that would fit on a 250 and work your way down because the pulses have more displacement and when you go supercharged push out a compressed amount of replaced displacement like they say there's no replacement for displacement compressing are still needs to uncompress more than normally

[@appleseed_316]

"I can feel the leak with my eye" Dont know why but that really made me laugh so that for that and glad you making headway.

[@sirtroon]

I have missed your videos but have such respect for your decision in taking some time off . To see the last two episodes made me smile together with you. Can’t wait for the next. Best of luck sent from Søgne 😊

[@KrisisVal]

Maybe try adding a 1/4 frequency resonator on the exhaust, tune it so it cancels out the positive pressure pulse at low rpm

[@ingoegal1405]

I allways thougt that the pipe is too short but i have this feeling u will not change the pipe but instead try a few thousand different configurations to the engine😅 You are one crazy guy 🤣

[@thedarkknight1971]

A weird one, but... NICE ONE! I felt such relief for you when just that simple little toying about with the exhaust made that world of difference... 'Onwards and UPWARDS!' again 🤞👍👍👍 😎🇬🇧

[@timrattenbury4768]

please try a different, lower rpm exhaust before creating an exhaust valve... Amazing progress as always tho cant wait!

[@billjacobs8035]

Congratulations man!

[@stewitr]

Leak detection - smoke. Either get a vape thingy, or something else to blow smoke in the area. Any leaks will become evident quickly.

[@anthonythurgood4059]

Maybe make a power band valve with a counter weight clutch to open them at certain rpm. Keep the exhaust port low until its at peak then lift the port mechanically. The pipe will be Sucking all the mix out at low rpm with the high port timing on that pipe.

[@danlaporta6375]

consider a 'slippy pipe'?, pipe extends and contracts based on rpm, you could even introduce an opening (intended leak) at low rpm while pipe is long position which seals off when pipe shortens.

[@jonathanbobrow1883]

Amazing! Great job man, your reaction to finding the issue was amazing and I felt it with you, thank you for sharing it. Can't wait to see what's coming!

[@AlienLivesMatter]

Try different length exhaust runners before the expansion chamber to find a compromise that works low rpm and high.

[@pauldemeester9298]

Back in the late 80s Yamaha had a twin 350, two-stroke that had valving on the exhaust ports that was somehow, cable operated in connection with the throttle, these were great motors, making tremendous horsepower, until they were banned as most two strokes were,, but I think you have stumbled upon the same situation. Keep digging you’re on the right track finally

[@nathan584]

Now that you figured out it was just the exhaust pipe i gotta say it sounded like it was just being too restricted so I would take off the stinger and try that first before trying another pipe

[@JMB676]

That’s awesome you found that problem. I’m glad you're back.

[@yzmoto5753]

Guessing the return wave arrives too soon while the rotary is still open. A reed valve masks that sort of thing. Guessing that's one reason why rotarys were mainly used in road race engines. They just kept them at a really high idle rpm I'm guessing.

[@putteslaintxtbks5166]

Reminds me of the 1981 Honda Civic with a 1500cc engine. When Honda put the catalytic converter on it, they expected it would decrease miles per gallon, like on about every other car, but it improved mpg. Mine got 36 mpg in town and 46 mpg on the highway. If I remember right, I think it also got a bit more HP too.

[@discontinuuity]

Congratulations on figuring it out. Sounds like you need a power valve in the exhaust.

[@SB-fe4gt]

Might try a slippy pipe that has an adjustable length head tube...common on two stroke enduro racing karts. Can you pressurize the intake to see how things flex when the super charger is providing boost...but while the engine is not running just so you can check the clearances in the rotary valve?

[@printces4328]

You shold make a valve that controls 2 exhaust pipes. One for low rpm and one for higher rpm. or you could try the exhaust control flaps like on a regular dirtbike that close of a fraction of the port to shift timing.

[@ludditeneaderthal]

Exhaust cutout... run a dual, 1 tuned to get you to "pipe rpm", and your high Rev tuned pipe. Swinging valve to switch between the 2. 1 position runs the low pipe, the other the tuned pipe. Low pipe like a "performance street" set up, high your tuned to Rev to Venus pipe, lol.

[@martinduddridge329]

Yes. A win at last. Or at least until you start looking a variable exhaust lengths. I’d favour rotary reed valve as you’ve already got it all there bar the reeds!

[@paddy2661]

Now rest Alex's , that low idol sounded like low spark , but also a restriction , Alex you say at 15.30 short pipe for high rpm it's the opposite expansion chamber close to cylinder is for low rpm bottom end power why supercross mx use shorter and motocross use longer primary before expansion chamber for wide open topend power., same with gocart they tune pipe lenght for size of circuit , I've watched your videos from day dot it's the missing link for topend power , on the salt you won't need bottom end power , a powervalve on a rgv (wired full open) yes will give boggy bottom end but once powerband is on it revs out fully , powervalve adds low mid performance and smooves out rev range . I'd say the rotary valve is causing the pulses it's increasing on/off more dramatically shooting the pulses further out of exhaust port so increase the primary (start of exhaust) to your expansion chamber 500mm slowly increasing size last 150mm you'll see difference you may need 600mm primary for salt dyno will answer that. Cheers easy fix

[@martinhertsius9282]

This is not a channel about two-strokes. It's a channel about a crazy norwegian guy that introduces problems and then solves them. With a touch of philosophy added. Which is awesome.

[@justinfoster7291]

What if you was able to run two exhaust ports and two pipes I wonder if it would dampen the harsh pulses down low yet still have plenty of flow and also the sweet resonance needed to come to life ? Just thinking outside the box. I smiled immediately as she came to life when you was playing with the pipe

[@deztructo123]

I always wondered how he could get away with the exact same exhaust for each revision that alters the pulses. Now we know.

[@terryrobotham2762]

You could finally be on the right track,,,,,,,,,,,,,,,,,,at last. Keep it up!

[@voraz9002]

WHAT! couldn't believe it when I heard the engine rev and saw how you achieved it lmao couldn't watch your videos until now because I've been on a roadtrip through rainy norway 😉 finally a breakthrough!

[@BlackStar-nk7du]

you can do a two exhaust system , one for low RPM and one for high RMP and an electronic controlled valve can switch between the two that can give you the best performance @2STROKESTUFFING