HOW TO: The Ultimate Go Kart Engine Tuning Tool - POWER REPUBLIC

In this week's video, we're showing you the ultimate go kart tuning tool, the Mychron 5 Lambda sensor.
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[@p.c.h.6721]

Finally a lambda sensor video, can’t believe no one has ever made a video before, thank you so much!!! Quick question, would it be the same (0.90-1.0) for an IAME Super Shifter 175cc? If it works on a Super Shifter I’m buying a lambda sensor right away. Thanks again Derek, you’re the man! 🙏💪

[@PowerRepublic]

Yes it will, most engines will perform best between 0.90 -1.00. there are exceptions but for the unfamiliar stick with the above. Thanks for tuning in PCH

[@p.c.h.6721]

@@PowerRepublic Thanks a lot 🙏

[@mecaserg]

Great channel. You can always learn something new. Nice touch the green zip ties to match the kart colour. 😄

[@brieee28]

Can you do a video on what maintenance is required for a KA100, and how often?

[@PowerRepublic]

sure can, where do you race your KA100?

[@brieee28]

@@PowerRepublic Don't have one, just doing some research and looking to get into it. I'm in the US.

[@Ch4seme]

@@PowerRepublic please make one I just bought mine and I’m still learning everything with it and I race at GoPro motorplex

[@gfronza]

Best Go-Kart channel ever!!!

[@PowerRepublic]

Thanks man! appreciate the positive vibes!

[@pieboy666]

Love all your videos keep it up!!

[@PowerRepublic]

Thanks legend 🙏

[@mosca3289]

Really good quality content 👍🏻

[@PowerRepublic]

Hey mate, thanks for tuning in 👍

[@billdaras7261]

First of all I love your videos.I have a question is there a big difference between the new rotax with the red motor cover and the old. I'm new to the sport so I'm learning 😂

[@billdaras7261]

When I say old I mean 2014 and new 2016

[@PowerRepublic]

Hey Bill, most guys are using the new painted engines now. I drove some karts last week that had old and new engines and the lap times were all within a few tenths. If you are learning to drive use what you have or can afford. if you are racing for championships then get yo self the latest engines, they are the most consistently the best engines

[@billdaras7261]

@@PowerRepublic ok thanks

[@chrisandryracing]

Awesome video dez! Could you do one on installation of mychron sensors for rotax. E.g water temp sensor?

[@PowerRepublic]

thanks Chris. I could do that on TikTok or IG Reels I reckon.

[@chrisandryracing]

@@PowerRepublic that’d be cool!

[@slidejobcentral]

Hey Des, what end of the .9 to 1 scale is lean and rich? So if we’re at .85 do go richer or leaner to get into the preferred range? Odd that there isn’t a single video on KZbin on how to actually read the data and adjust it to get to the sweet spot….

[@retokern5716]

Hi. Awesome channel and great videos. I am looking for a full video how to rebuild a DD2 EVO engine. I know there is some tricks for better performance by rebuilding and still be ok for the RMC series. Do you have one already and I can’t find it or could make one. I was also looking on your webside and contacted you about a month ago.. i am sure there will be a lot of ppl out there interested for it then there is really nothing to find in the web other then the guide from rotax which is only general. thank you

[@PowerRepublic]

Hey Reto, I only have the tutorial series on Race Winning Engines for Senior Max, but they are the same as the DD2. did you check that out on our website www.powerrepublic.com.au/products/race-winning-engines-the-rotax-edition-part-one-bottom-end

[@christoferfedrick4940]

Where would you Attach one to a rotax evo exhaust and when racing to msa standards are there any do’s and dont’s for the welds/ use ?

[@PowerRepublic]

Hi Chris, great question. Thanks heaps for tuning in and sharing the videos. You could weld it into the inside radius of the pipe, halfway from the header and the stinger outlet. We use MiG to weld ours but you bronze weld too.

[@psalvest]

Gidday Derek, thanks for all your guidance, you've been so helpful. If I'm running at the same track all the time & have tuned my kart with a LCU One, do I need to re-tune and/or check the tune every time I race at the same track or once it's tuned, it's tuned? I get weather & track conditions would change from day to day but would they really change enough to have to change the tune, particularly when I'm really only a weekend warrior who won't ever be running at the elite level. I'm also running 3x karts so does that mean 3x LCU Ones or - in the same vein as my 1st q - once it's tuned it's tuned & I can just shift it from kart to kart to tune each one? Thanks again

[@PowerRepublic]

Hey PS. Merry Christmas. Yeah just the one should do it. Then swap the LCU 1 to each kart as required. Once’s it tuned, should be GTGG

[@psalvest]

@@PowerRepublic Perfect thanks kindly Derek. Thanks again for all your guidance...

[@nathansimpson1289]

Is there a video on wheel rims?

[@PowerRepublic]

sure do my friend

[@carlosturpo4409]

Que porcentaje de aceite por galón de combustible recomiendas usar para la mezcla de un motor iame x30.? Según el manual del motor recomienda 4%.

[@PowerRepublic]

we use 5%

[@psalvest]

Gidday, any chance you wouldn't mind running a similar vid on the Easitune please?

[@PowerRepublic]

can do my friend, thanks for tuning in and sharing the video!

[@psalvest]

@@PowerRepublic perfect thankyou kindly. always a pleasure to learn from you, especially during lockdown!

[@gfronza]

Hi Dez! What's the durability of this lambda sensor? I've been using the Mychron5 EGT sensor here and I find It to be so fragile... it's a decent tool, but I can't seem to find a way for it to be durable enough (6/8 sessions and it's usually gone). To be fair, we race the old Iame Suddan MY here in Brazil, which produces a lot of vibration :/

[@PowerRepublic]

Hey Germano, yeah they are fickle, so maybe just use them to tune the carby then take it off. the older same engines do vibrate a lot if they don't have a balance gear

[@gfronza]

@@PowerRepublic yeah good point and will do that! Thanks for getting back to me man! I really appreciate it.

[@robertkamperin4382]

I know you covered this somewhere else but where can I get the slip-on wheel covers?

[@PowerRepublic]

www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwjSt8_zpJrwAhUgwzgGHb4pCrUQFjADegQIAxAD&url=https%3A%2F%2Fwww.oglove.shop%2F&usg=AOvVaw2RqEgNP-bqNBjekF9FOyqK

[@dannyhyland2911]

Will the LCU-One lambda sensor work with the older MyChron 5 or will it only work with the newer MyChron 5S? Thanks

[@PowerRepublic]

sure will. works on both. thanks heaps for tuning in 👌

[@keithelkins4330]

But can you run the EGT and the lambda sensor at the same time?

[@okmanvargas6106]

Hello! I have a problem with my rotax go kart, and everytime its idle it turns off :( do you now what could be wrong?

[@PowerRepublic]

No problems other than cleaning out the jets so it carbs easier. You could turn up the idle screw or adjust the throttle pedal to suit higher idle speed.

[@s0k4rting93]

Hi I started karting around 7 months ago. I have gone out around 10 times. And the race speed lap times are around 43.2 and I’m at 50.0 on adverage how much faster do you say I will have to if I wanted to get a mycrone?

[@PowerRepublic]

get one if you want it. otherwise get some more practise and coaching and use the Mychron money for some new tyres. that will get you going faster IMO

[@tyschlorer2229]

You mentioned two different placements. Is there a difference in the readings?

[@PowerRepublic]

great question, I haven't used them both at the same time to tell you.

[@Unidentified-t7e]

Does that also work for shifters ? Asking cause they normally don't have a battery 🤔

[@PowerRepublic]

Yeah it would work excellent. But yeah you would need to add a battery

[@henryhardachre9603]

The SupaTuna tuning lights I use normally run off a 9v battery but I've adapted it to use the X30's battery. Not sure how the Easytune lights work. "tempdrive.xyz/Henry/X4%20Kart%20S-Wheel%20side%20view.jpeg" "tempdrive.xyz/Henry/X4%20Kart%20S-Wheel.jpeg"

[@henryhardachre9603]

As a side note I've ordered a 12v to 3v stepdown module off eBay, not an Alfano part, and will be adapting the Alfano to run off the X30 battery also.

[@realagent83]

Thanks!

[@realagent83]

Would you recommend the lambda sensor on a cadet kart running a Rok Mini. Someone told me to get the exhaust temp sensor. Thanks

[@PowerRepublic]

Thanks legend , yeah the lambda is better for learning how to set up the carb IMO. The EGT is allowed for competition but I find it a little vague for fine tuning the carb. get a LCU 1 kit and get the carb all set up (float level, air bleed, main jet, Needle clip ) in the combination that suits and then you can take it out for racing.

[@Ian_Smith16]

Hi what are the tyre warmers you are using in this vid and where can i get some ?

[@mariusloseth]

Hey. Im going to instal this lambda sensor om my 2021 tonykart with x30. The messurement off 115mm from the exhaust port is that best position for the sensor? I see that on unigo i say’s Mount the sensor min. 200 mm from the backside of the piston, in an angle of 30-45 degrees.? What to use?

[@PowerRepublic]

you can weld them in the body of the muffler in between the diverging and converging cones. otherwise in the header pipe is good too. 115mm is what we used to use on the older X30. the modern heated O2 sensor can be placed further away from the exhaust port.

[@mariusloseth]

@@PowerRepublic i found that 290mm from piston is perfect position on the new 2021 exhaust is now one pice. Then the sensor don’t get in the way for nything, Do you think that this is a good position to use att 290mm from piston? And hope you will make a video on explaning when to use rear torsion bar or not ;)

[@PowerRepublic]

@@mariusloseth thanks heaps for tuning in and sharing the information about your exhaust. gee, great idea. we haven't used them in years. most likely good for super heavy guys that are bending the kart too much.

[@pablin123]

How long do you think the sensor will last considering it is a 2stroke?

[@PowerRepublic]

they are pretty heart considering the environment they live. you can get replacement sensors, or if you were really concerned, you could remove the sensor after you have tuned the carney to the engine.

[@pablin123]

@@PowerRepublic thank you! i've always used wideband's in 4 stroke but never in 2s due to the mix. I think that, what you said, to remove it after tune, it is the best option for me.

[@PowerRepublic]

@@pablin123 most guys just leave them in. what engine are you using?

[@pablin123]

@@PowerRepublic Rotax DD2, i currently use only EGT

[@PowerRepublic]

@@pablin123 when you change the main jet or carby, are you seen a direct correlation in EGT up or down?

[@abuckshort]

Is there a benefit to using one on a Rotax Evo senior? My kart shop says no.

[@PowerRepublic]

we don't use them here ourselves either. so probably not essential

[@nathansimpson1289]

Hi, I've been having issues with my kart bottoming out through some corners, is there any advice you could give so I can overcome this?

[@PowerRepublic]

you could raise the ride height of the stub axles. as long as that doesn't effect your lap times negatively then you are all good

[@olivermortimer9100]

Hey mate, I was starting up my Rotax Max 125cc Junior for the first time in a while, and when it started up the engine started gaining revs, and then it wouldn't turn on, do you have any idea why this is

[@PowerRepublic]

It’s probably out of fuel. Check the fuel pump is pumping fuel to the carby and the carby isn’t blocked

[@olivermortimer9100]

@@PowerRepublic Yeah we had more than enough fuel, so potentially we may have been running the wrong fuel or the carb has been blocked, thanks.

[@miltiadiscolivas5060]

I had this exact same issue, ended up being the throttle cable was not letting go completely because of a broken wire in the sleeve was digging into the liner on occasion.

[@olivermortimer9100]

@@miltiadiscolivas5060 Thanks, yeah I will check that out.

[@sandhands600]

Can I use this on a rotax? My battery harness doesnt have the spades would this be a problem?

[@robertkamperin4382]

No worries, there was a Rotax type battery mounted on this kart and as you can see, they have just added some terminal adapters.

[@PowerRepublic]

yeah that is correct, the little terminals just screw on. the LCU 1 kit will draw down your battery power, so make sure you bring a spare or battery charger

[@henryhardachre9603]

@@PowerRepublic B^) Or switch to an X30 as it charges the battery as you drive around. (-;

[@jakepowers2603]

Great video! New Go Kart Dad here in the US. Carb tuning is something I definitely want to learn; specifically the KA 100. Would you recommend that range .9 - 1 for the KA jr? Where in the track would you measure? Out of a corner and longest straight? Lastly, how much does AD affect carb tuning? I assume it’s a couple minutes one way or the other

[@jakepowers2603]

Thank you for all the info you post!!

[@PowerRepublic]

Hey Jake, cool name BTW, thanks for tuning in. yeah they can run as lean as 1.10 but best kept around 1.0 in the .90's off the corners like a hairpin, then it should run leaner down the straight if possible. but with some practise and testing you will find what gives you guys best on track performance.

[@kennethmrk4739]

mychron 5s 2t manual kan den bruge på en 4 cylinder motor

[@PowerRepublic]

yeah it should work whit a 4 stroke motor

[@BLITZKRIEG1]

you'd think after all this time OTK would accommodate a mychron/Alfano unit onto their steering wheels without the need of an adaptor.

[@henryhardachre9603]

I've just bought an Arrow X5, the wheel on that is supposed to support both Alfano (what I have) and Mychron. It hasn't arrived yet so I can't test that.

[@PowerRepublic]

yeah I reckon, you can make one pretty simply with a aluminium flat bar 30mm wide by 80mm long.

[@MatrixTheme]

If the guy who invented zip ties knew how big impact he had on karting!

[@PowerRepublic]

Hell yeah to that. Love that guy 👊

[@sathviksarathy4275]

Hey guys, what does the lambda sensor measure?

[@desperadoehitus8704]

air fuel ratio

[@henryhardachre9603]

The amount of Oxygen in the exhaust. From that you can then tell if the mix is lean or rich or just right !

[@sathviksarathy4275]

@@henryhardachre9603 does the EGT not also say if it’s rich or lean? So what’s the point of knowing the oxygen?

[@henryhardachre9603]

@@sathviksarathy4275 Not as accurately as O2. The O2 sensor measures the amount of oxygen in the exhaust gas just after it leaves the cylinder head. Knowing how much O2 you can then extrapolate with accuracy the air to fuel mix. EGT measures exactly that, the Exhaust Gas Temperature, if everything is normal in the engine you can also extrapolate the air/fuel mix with less accuracy and if things are not normal there could be less correlation between the ETG readings and the air/fuel mix. An O2 sensor measures one of the 2 main concerns in determining the air/fuel mix, the oxygen in the air. An EGT measures the temperature of the result of combustion, which do you think is better for checking for checking air/fuel mix?

[@sathviksarathy4275]

@@henryhardachre9603 Probably lambda sensor is more accurate. Thank you for explaining.

[@fan4ous]

Cannot find in all KZbin videos how to set alarm lights

[@PowerRepublic]

that's in the LED menu. click through and can change them for the different sensors and sensor outputs. sorry for that, but she's pretty easy once you get in there. Hope that helps.

[@fan4ous]

@@PowerRepublic i checked it. It’s giving me the msg “set temp limits first”… but where and how doesn’t say anywhere

[@PowerRepublic]

@@fan4ous look on the screen, the buttons normally change function once in the sub menus. let me try it out this weekend when I'm at the track and I will make a little reel on IG for ya

[@bernardplanko6780]

@@fan4ous the limits you set in Race studio

[@diegougarte]

why my mychron doesnt show in the display list options the lambda ones?

[@diegougarte]

maybe becaus i havent connected to it yet?

[@PowerRepublic]

have you got it connected? otherswise it won't show up for selection

[@diegougarte]

@@PowerRepublic that was exactly wtha wass happening haha

[@PowerRepublic]

@@diegougarte sweet, easy fix!!!

[@keithpoirier1205]

👍🏻👍🏻

[@PowerRepublic]

thanks for tuning in Keith

[@benjisyt]

👌👌👌👌👌

[@benjisyt]

These videos been a huge help with setups etc for myself as I'm just about to start getting into the tag125cc class, keep the great work with the videos up lads!

[@PowerRepublic]

@@benjisyt talks Yo, glad to help you out. now get out there and destroy some tyres!!!!

[@jacksonbermingham2168]

I have a lambda for sale spare.

[@PowerRepublic]

Thanks Jacks

[@OzDizzer]

8 advertisements in like 2 minutes.. sadness.

[@PowerRepublic]

sorry bout that bro, small price to pay for so much awesome !

[@OzDizzer]

@@PowerRepublic Hahaha.. yeah but its like double advertisements... one for the lambda sensor and one for youtube. But yeah, if i didnt want to know about the lambda i wouldn't have watched. :P

[@PowerRepublic]

@@OzDizzer thanks legend 👊