Cylinder head designs for the 80cc / 66cc 2-stroke Chinese bicycle engine

[@jeremiahgotelli895]

We're did you buy the head with three spark plug holes. Do you just use one cdi and attach 2 more boot caps?

[@codycastro8083]

hello. thanks for the video. We're did you get that cylinder head temperature sensor at.

[@jbolo5378]

I'd bet that 3 hole is a lot higher compression than you think because of the 3 plug tips and electrodes reduce the overall volume of the combustion chamber considerably. Just a hunch.

[@Str4ng3F0lk]

Sorry, im new to this. I thought more compression = more power? Why do you prefer a lower compression head?

[@1guy1car7]

run lower octane

[@lpacheco06226]

Definitely what I needed to know for my cylinder head rebuild.

[@VasilyYt]

Which cylinder heads are in the 2nd and 3rd places when it comes to performance and cooling in your opinion?

[@juniorsucnod.2609]

For the 3-sparksplug version, it goes with the same CDI? Or I have to get the Jaguar CDI? The magnet in the engine, it is standard too?

[@movingwater9111]

Hi fabian an an engineer i love your videos. Could you please do a video instrucrion on how to instal the jack shaft shift kit? Kind regards

[@SpiderRiderAdv]

Just a quick note about detonations... Higher compression heads needs higher octane fuel otherwise it'll start detonating.

[@TheLordMaximo]

or a different pistons and chamber format, theres variations on high compression heads about the dynamics from these ones

[@zedee2000]

@@TheLordMaximo I'm pretty sure autometer has a cylinder head temperature gauge with a spark plug ring that goes under the spark plug for measureing cyl head temp . They even have a few new adjustable warning gauges that you can wire up a few different ways to alert you with a light horn or both. It's basically a switch to cut on or off.

[@TheLordMaximo]

@@zedee2000 i'm not fan about place gauges for that, but that i would use if im using a heavy tuned engine, theres different pistons and i got 3 types differing on his head format, place where the ring goes and the strenght of these rings then for those parts each one makes different effects combinated but is about you have good ears and the correct tools to tune up these parts

[@zedee2000]

@@TheLordMaximo A water gauge saved my motor on a over 700 dynoed horse power motor when it got to hot the motor shut off and saved me from over heating. One of the best things I installed.

[@TheLordMaximo]

@@zedee2000 eh.... we are talkin about big engines or bicycle engines 😂?

[@zoologicalmilitia2241]

What does CNC stand for? good vid, thanks

[@bryduhbikeguy]

Computer Numerical Control ..Lathes,drills, and Mills,etc. for machining stock metal into shapes.

[@novavroomvroom2979]

I have a PK80 stock but I put a aluminum high compression head to cool off the engine.... Am I using the wrong head since it is all stock for the exception of the billet head

[@DirectCurrent4u]

no. That head will work fine on a stock PK80...

[@meskalin64]

Does any of theese have 47.3mm squish band?

[@sartjunanbtimes8663]

where to buy 2 ignition spark cylinder head

[@shelfingtonthe3rd659]

What about the shark head? What type of compression does the shark have?

[@bryangash1314]

Can I use a read valve and boost bottle together or will the read nul the bottle

[@cryptopyro]

A boost bottle is a waste of time. They only lighten your wallet.

[@salvatorej.quaglieri7792]

How come my cylinder head doesn't sit flush with the gasket, I have a a gap almost all the way around. The engine is brand new out of the box. I even tried it on another engine and it didn't sit flush with the gasket surface, even tightened down

[@noahsnyder7142]

I'm trying to learn about all of this seeing as i plan to build a motorized bike of my own, but unfortunately i am ignorant of how the motors actually work and what all the terms such as measurement, compression release, etc. Can anyone tell me blogs or channels i can go to that will teach me the detailed mechanisms of what means what and how it works?

[@cryptopyro]

You can try these websites, of which you will gain a lot of knowledge when researching topics of interest: motorizedbikeforum.the-talk.net/ www.motoredbikes.com/forum.php

[@noahsnyder7142]

I'll look these over. Thanks a lot Fabian F.

[@cryptopyro]

Noah Snyder Glad to be of any help

[@VirantRoss]

Noah Snyder me too... Lol

[@tjdukes7452]

Can u please tell me what the number on the piston means mine has a 3 on it. And I need to replace the cylinder. ..it's a power king kit. ...thanks

[@garychief2338]

Tj Dukes www.amazon.com/Generic-Cylinder-Motorized-Bicycle-Engine/dp/B00PAEEERQ/ref=pd_sbs_263_5?ie=UTF8&refRID=1WSG2P6ASVZREMF2RSE8

[@blgarage9519]

Which of these heads would you recommend?

[@richardnorris3367]

Capt. Bacon I would also like to know. I need low end torque. I live in Nevada and hills are abundant.

[@ricksimpson2167]

Richard Norris ,,, For Hills you need to change your. rear sprocket,,. 4 more tooth on the sprocket. Is more torque,,. Or 4 less teeth more speed,,,. Higher compression more power but slower to get there,, and you lose torque,,,. When you mess with an engine you're taking it away from bottom end and adding it to the top end,,. And cutting down the life of the engine rings and bearings,,, just gasket match your intake manifold to The Jug cut your gasket down to where there's nothing hanging over,, use high octane gas and better oil,, synthetic,,. Or mc1. For Hondas 2 stroke, less oil more power,,. More oil accumulates carbon wears out the engine quicker,, and it bogs,,. All these motors needs a slightly larger jet after they're broke in,,,. A racing carburetor will not help you climb Hills,,. It will be slower taking off and then faster when it's at top speed,,,. Trimming the Piston skirt down will give you higher speed but you'll lose torque taking off,,,. A racing Muffler or a loud Muffler will give you more speed,, but it will cut down your torque,,. See where I'm going with this,,,. Where do you want your power at,,. ???

[@Bull3tBikes]

The best performance mod is weight reduction of the rider

You never did give us the actual cc volume number for the three and two hole. I'm interested cc for the three hole that you said you got the best performance from.

[@rewabaso500]

Is the item for sale. How much does it cost?

[@NitinSainiOfficial]

hi,please tell which is best head to use in 80cc 2 stock engine ?

[@MoesKeckeEcke]

Nitin Saini Official the designer is called "darude sandstorm" you have to look for a vide on KZbin

[@cijoykjose]

Moes You take that ... Hahaha...

[@cijoykjose]

2 spark plug one is good and loaded with a lot of power ...

[@sartjunanbtimes8663]

but where to buy

[@cijoykjose]

Sartjunan btimes Search online

[@lukegaming86]

I have the small cylinder head and never had overheating problems

[@leedunlap92]

did they come with head gasket and what was the name and where did u find the head with the coldest temp.i live in fl. need low temps bad

[@bryduhbikeguy]

cr machine.com

[@joshuaharrison9331]

run a cooler spark plug then ...

[@rexterrocks]

Joshua Harrison A cooler spark plug isn't going to make an engine run cooler though is it? A hotter one won't make it hotter either. It's going to be exactly the same temperature whatever plug you use.

[@Xgamer121X]

great vid! can you make another one like this where you say how much compression each head gives?

[@joshuaharrison9331]

he said the cc compression of all the heads.

[@cesarlourencocesarmusicbox5278]

Hello, do you know if it's possible to mount a high compression head on a 49cc engine? Is the difference in the 49cc and 66cc engines only on the piston and cilinder? Can I mount a 66cc engine cilinder and piston on a 49cc engine? Thanks in advance. Cheers from Portugal.

[@zedee2000]

What is the name of the triple spark plug cylinder head and who sells it?

[@bea0cat0dark]

How much it cost the "B"

[@neardood1]

With the stock heads - without pulling it off how can you tell if its the high compression variant or not? (Mine was leaking so i took the head off and tightened it down, its stopped now but I don't want to mess with it)

[@cryptopyro]

Unless it has an angled spark plug hole, there is a high probability that the engine will have a low compression cylinder head. Because the engine uses an aluminium gasket, you will periodically need to retighten the cylinder head nuts, due to combustion vibration hammer peening the head gasket. This is completely normal, and nothing to worry about. A small amount of oil leakage from the standard cylinder head can be expected, and is also nothing to worry about.

[@neardood1]

I've since bought a head that looks identical to the lower second from the left. Its an angled high compression head with the keyhole shape. Interestingly the one that came with the bike was also angled but it lacked the keyhole shape, causing me a bit of confusion.

[@MiguelHernandez-hc8ui]

Hey Fabian, have a quick Q for you. Using the three or two spark design, how did you set up the dual/triple ignition? Used one coil for each plug?

[@cryptopyro]

The magneto does not supply enough power to run a dual ignition, however you could run a dual or triple ignition system if having an external power supply like a high A/h lithium battery and a bespoke electronics package that steps up battery voltage to replicate magneto output voltage as well as replicating the magneto A/C sine curve; allowing you to connect multiple Jaguar CDI's. In my case i simply connected the Jaguar CDI to the rear most (longitudinal) spark plug; using the second Jaguar CDI as a backup system should the primary Jaguar CDI fail in operation; giving the option of simply unplugging one CDI and plugging in the alternate CDI into the magneto output wires.

[@jeremiahdssdentmorgan3341]

I've NEVER had an issue with just one plug that's already hooked up to even make THAT an incentive

[@Westhelockpicker]

@@jeremiahdssdentmorgan3341 me neither

[@mcastillo8775]

where can i buy the one for 3 spark plugs ?

[@cryptopyro]

shop.crmachine.com/category.sc?categoryId=5

[@123hoodnig]

Amazon.

[@МикитаКостюшенко]

Hi. Do you know about 90-100 cc bike engine?

[@teddybesplitinlanes5500]

what parts are needed for the head with 3 spark plugs?

[@cryptopyro]

The cylinder head and 3 spark plugs or two spark plugs and the compression release mechanism.

@@cryptopyro Hi Fab. You never did give us the actual cc number for the three and two hole. I'm interested cc for the three hole that you said you got the best performance from.

[@Bull3tBikes]

Do an updated video with the diamond head and puch head

[@richardroulette996]

Speedstermotors Rick here none of these have the compression nor squish band that of what mine are I think about getting back into the industry. I did the 3rd design of the 4 cycle gearbox in 2008 and development was final in 2009 for the Nantong Jiali Gosoneine Engine Manufacturing Company that produced the first two Hoots which were failures. When I got out in 2015 from prison I noticed it took the market ..in 2011 Gas Bikes Sam and John who they and My Father had a phone conversation where there was a 12% agreement made to use my ads for which at the 2011 mark owed me over $100,000. Makes me sick. Thank for for Catching me up with these multi sparkplug and ignition variants mister..you and ya`ya all have a great Sunday..Rick

[@jayemmanuel9471]

i would like you to make a video on how to set up the 2 hole head...

[@cryptopyro]

+Jay Emmanuel It's simple. You put 2 spark plugs in the cylinder head, or you use one spark plug hole for a compression release mechanism. Not difficult to understand.

[@jayemmanuel9471]

So that will meet that I will need two cdi's to run both or there's a special one for it?

[@malcolmreevebenjamin7236]

Jay Emmanuel .

[@jayemmanuel9471]

can i get a link to get one of them 3way heads ??

[@cryptopyro]

+Jay Emmanuel shop.crmachine.com/category.sc;jsessionid=BFF02FFB2251AACB0CBC13B50C88FA4B.m1plqscsfapp01?categoryId=15

[@bryduhbikeguy]

Thanx for the information.I have the angle fire head and am pretty happy with it.No mods and run premium pump(93octane),with semi-synthetic oil.Summer is coming and there's alot of hills around here.I was wondering about better cooling fins with the same compression.(Oh,forgot to say I have the 66 with 40mm intake and exhaust ports.Great torque.Only non-stock is I used a Very fine file to the inner edges of the gaskets for both ports so there are no restrictions.)

[@russbilzing5348]

I have the Rock Solid head on a 50cc and it hauls my 225 lb ass all over town without a whimper.

[@matthewsteva368]

im suprise they have it come out 4 or 5 hole spark pluge head

[@RJ67.]

1:08 Over here in the good ole USA it's a bloody flashlight M8... a torch has flame man !! . Nice video seriously I was wondering if you could do a video comparing a motor with a boost bottle and one with out ..some claim better gas mileage as the fumes get trapped in the bottle I can see this being a benefit considering the minimal amount of fuel to run these

[@cryptopyro]

The "Boost Bottle" concept has been work-shopped to death. By the nature of the process, a boost bottle is a complete waste of time, and has proven to be a worthless concept, and a waste of money. You are far better off investing your money in a Rock Solid Engines reed-valve-intake. This design actually "does" improve low and midrange power/torque, hence the reason why it's fitted to my bike.

[@movingwater9111]

Over here in australia we dont really worry at all about good old usa. Its a torch and fries are chips.

[@cgod241]

where can these be purchased

[@joshuaharrison9331]

online.

[@linusmadrone]

Thanks for the information! nice vid!

[@COOL_CANADIAN]

Which would you recommend for speed?

[@COOL_CANADIAN]

My parts are a 66cc grubee SKYHAWK with a nt speed carb second gen, and a 36tooth rear sprocket

[@COOL_CANADIAN]

Also I prefer 1 spark plug

[@DarkLinkAD]

I wonder how this compares to the Yamaha ET650 2hp head. Built for lower rpm reliability.

[@rewabaso500]

How much is 50cc

[@honorb4glory606]

I just got a so called "PK80," and I was very surprised to find that the jug and head are one solid peice. Do you know of any pitfalls of this design?

[@danieljohnston6521]

Lil to no upgrades for the one peice cylinders but they are good motors

[@honorb4glory606]

@@danieljohnston6521 , Yes, reliability over performance. My bike isn't just for fun, it's a commuter, so that's exactly what I need. I installed the torquiest exhaust available, so it only goes 32mph, but the thing can't over-rev, and I don't need to pedal. Not even up the steepest hills, or when I take off. 👍

[@darkraft100]

@@honorb4glory606 hey, can you tell me what exhaust you have got? I need more torque on my 66cc

[@honorb4glory606]

@@darkraft100 , there are three called "torquer" or "super torquer" exhaust. There's a flexible one, which wont last, and two solid ones. The longest one will give you the most take-off torque, but for a 66cc, I recommend the slightly shorter one. That should match the engine better. You can find them on ebay and Bikeberry. Be prepared to send it back, because they wont fit all builds.

[@darkraft100]

@@honorb4glory606 I can modify a exhaust, also, what engine cc do you have?

[@sneffels]

Wow. for all the review types and all the other ( less a one or two for other reasons) reviews. Can I say oyu you so a good job, not only explaining but letting the camera and there for the viewer see.

[@cryptopyro]

+Sneff Happy to be of help. Hope you can now a more informed decision about cylinder heads for the Chinese 2-stroke motorised bicycle engine.

[@NitinSainiOfficial]

Sneff please tell.which is best for 80cc 2 stock engine and how much spark plug

[@coreyhigh6157]

The last one bottom right I bought I’m putting on my 66 cc running 100 octain

[@mariussalvesenmeland]

witch one is thre best and u shud make a video of wahts good and bad for 80cc

[@cryptopyro]

The best cylinder head is the one that is correct for your operational requirements. The best cylinder head for your needs might not be the best cylinder head for someone else's needs. The worst thing you can do to a Chinese 2-stroke motorized bicycle engine is to rev it past 5,000 rpm on a continual basis. Keep it below 4,500 rpm and it will live a long and happy life in conjunction with an aftermarket CDI such as the Jaguar CDI. Jetting the carburettor correctly is also very important to give the engine both good power and long life. There is no magic jet size, because the jetting needs to be optimised for your location as you will have different atmospheric conditions compared to someone else living in a significantly different location.

[@cryptopyro]

marius salvesen meland They all come from China, however the engines that come out of the Nantong Jali factory seem to be of reasonable quality. You will need to do your own research as to which companies get their engines from a distributor sourcing their stock from Nantong Jali.

[@ChuckHaney]

I'm building a Mongoose Dolomite. Very small triangle. I'll keep that slanted head in mind.

[@miguelislas8158]

i have a 2 stroke were can i buy a high cylinder head plz help the cowboy

[@smokeshow1984]

get a puch 70cc hi hi from treatland.com it will bolt right on and has way more surface area for cooling and 20% more compession, best part is its 30$ as opposed to 80-100$ ones he showed here

[@smokeshow1984]

make sure you use 91 octane id you do

[@miguelislas8158]

hi mike r my bike is on you tube then go to umoto bikes .com look 4 the yellow bike chopper my promblem im in tucson az cant find the head plz help

[@mr.motormaster9881]

FRED HEADS

[@Westhelockpicker]

The build break fix channel just did a test on a bunch of heads and ironically the cheap cast one on Amazon for like 20 bucks gave the best performance and ran the coolest. Now I feel like an idiot buying the one that's around 60 bucks

[@marthamryglod291]

I believe that the cr machine head has better squish and that makes for better combustion

[@zedee2000]

I think the man said the triple spark plug head was the best if they fire one after the other that makes the most power of course. I know because I had several dual spark plug 4 cylinder Nissan engines with 8 spark plugs total and two spark plugs in one cylinder fire one after the other for more power and cleaner burn. And disconnecting one coil slowed the motor down with both coils on the motor the motor revved up ran more smoother idle smoother and made more power.

[@Armilite1]

Let's hear more about this Dual Ignition, Dual Plug Heads!

[@akabiscuitwaffle]

The idea for the use of dual ignition is for inside extremely large cylinders where the only way to get the ignition to spread fast and evenly enough is to use 2 spark plugs spaced out. Inside a smaller engine like bike engines- the extra spark makes zero difference. Whichever one goes off first by even the smallest amount of time, will cause the entirety of the gasses to ignite by the time the 2nd one fires. If you're running extremely rich, or go for long rides, it's useful as a fail safe incase one fails mid-ride. However, just like with the three hole variant, it does lower compression- which can be a good thing if you're over 145 psi. As higher compression can limit the max RPM. Higher compression causes higher resistance on the compression stroke-which is where you can loose power despite each ignition being more powerful.

[@Homemadefood_44]

Where you get that string bracelet looks southeast asian

[@daltondrummer]

this was the most helpful video ever.

[@oldvoljin]

thanks, for the information.

[@cryptopyro]

Voljin Happy to be of any help.

[@scottytherambler6919]

if i was you i would get ahold of some copper pipe, and some extremely high temp epoxy, you then lay that pipe in a way where it wraps around the head between the veins, close the the most meaty parts of the engine, id also fill said gap with some kind of thermal paste, then once the paste, and pipes are laid in and placed nicely, you cover the area with an epoxy, and sand down to bare metal. the copper tube is a boiler, you then hook one end up to a condenser, and one end up to a resivoir, and you have automatic boiler powered water cooling. make sure the coolest liquid begins its flow across the hottest part of the head.

[@cryptopyro]

That is an option for those who want to add extra complexity to the system.

[@joshuaharrison9331]

why would you need more than one spark plug? only if you are running very bad fuel ...

[@cryptopyro]

A twin plug cylinder head gives more ignition consistency when using a marginal ignition system found on these bicycle engines.

[@joshuaharrison9331]

... it started to detonate so it was the worst cylinder ... I wonder if with the correct octane fuel it would be the best head ...

[@cryptopyro]

The fuel used was 98 octane (Australian East coast) unleaded or what would be called 93 octane in America.

[@robertjeeves4588]

Don't forget when you raise compression to high levels you may require a hotter grade plug

[@marthamryglod291]

Higher compression increases cylinder temperature, and a cooler plug is needed. It needs to get more heat off the tip than in a low compression engine.

[@mikegamba580]

Idk I always hook my temperature guage to an exhaust stud or exhaust bolt right on the cylinder head I figure the exhaust is usually the hottest spot. Idk I don't really have a real teacher just KZbin and common sense I guess lol love the video super cool stuff

[@corysnladventures2758]

So you need 3 coils to run 3 spark plugs? And why 3 plugs for 1 chamber ???

[@cryptopyro]

You do not "need" 3 coils to run the engine with this cylinder head, but you could do so if you so chose to do so. Commonly you can use a decompression release mechanism in one of the spark plug holes as well as running a twin plug, twin coil setup, if that is part of your ignition requirements.

[@ghlk1709]

what a joke

[@50ccRacing]

I did use a head with 3 sparkpugs and did test it in comparing with one sparkplug on my 90cc Kreidler draracer. Conclusion one spark is much better, because a strong squish press gasses all to the center of chamber and so burning period is much shorter. facebook.com/photo.php?fbid=10200735745995097&set=a.10200573123809644.1073741845.1805454134&type=3&theater

[@Kingtoneable]

Luc Foekema totally agree

[@KrustyKlown]

Many ignition systems aren't going to easily fire across 3 spark gaps ..my guess would be that ONLY 1 of 3 plugs actually fires (the path of least resistance). The extra plugs will disrupt flow, not good .. one plug is bad enough, why add 2 more? Lastly the 2 higher compression heads in upper left of table, look like the best ones, if those did not run well on his motor, then that motor needs some port work and/or better pipe. I have many many billet heads from scratch for kart racing motors.

[@50ccRacing]

Wrong, al three fires, because all three coils were loaded, so impossible not to fire. When all three were contected to 1 coil you are right, in that case one of the three will only fire.

[@cryptopyro]

Incorrect. When using such a system, you operate the engine with multiple ignition systems.

[@cryptopyro]

I agree

[@joneserupinsmoke9161]

Lol dude I appreciate all the shit went through but yea if u can't make a temp ring fit or work just stay home

[@poucheandrews5106]

Hey Fred . Like your page . My bike is different . Will send you pics . Dealing with mechanical aspect . Cylinder is scored , cannot remove , the wall is scored and the rings or wrist pin clips are catching In the oilers . will have to cut it . Need a cylinder and piston bored out . Contact me . D.A.

[@joshuaharrison9331]

useless video - this guys doesn't seem to know much about 2 stroke. He seems good a shopping though with 9 cylinder heads...

[@maxlvlnpcboss4812]

That first cylinder head is crap, I now know why it was only 30 bucks for the head and exhaust combo haha.

[@applepoop10]

Add a cooling fan and you will maximize cooling.

[@richardnorris3367]

Ian Above what type of fan is needed!?

[@derekess48]

One with a really long cord.