How a 2 Stroke Clutch Shaft Works for a 50cc and 66/80cc BikeBerry Engine Kit

Learn how a 49cc or 66/80cc 2-stroke clutch works, plus fast and easy ways to fix any clutch problems.
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Everything you need to make your own Motorized Bicycle.

[@natedavis3943]

I just built a motorized bike and I just wanted to say thanks for taking the time to make this video. My clutch works great out of the box, but after watching your video I understand how it works... Which will come in handy when I inevitably have a problem with it.

[@wildbill23c]

Could you do a video on the clutch itself, serviceable components on the clutch, how often to expect to need to service the clutch, etc.

[@damonstevenson2620]

Thank you! I just finished building my 1st bike and you answered my question just by going through a simple demonstration. Saving me a lot of research time. And in addition to that I wouldn't a lot more about how the clutch works and how it engages in disengages. Thank you so very much, your new subscriber.

[@TheGearhead222]

GREAT video! I've owned my 49cc Grubbee Skyhawk GT-2B for over 10 years and NEVER fully understood this clutch design:)-John in Texas

[@caitabbott1021]

hey i like the fact that you are detailed with everything that you are saying about the bike im still having troublewith mine and would like to get help

[@presleyfleckmotorizedbikef4285]

Thanks for info much needed for memory keeping

[@MFourtySeven]

I fixed my bent holding pin. Thank you for the video.

[@katechapman8620]

i really like how he explains everything in such great detail.great job and i apreciate your help alan

[@sundial6919]

Its like reading between the lines

[@JorgeRodriguez-ei2gi]

Thanks, we need more videos of motorized bikes, issues, upgrades & tips, thans, say hello, joe.

[@michaellipinski2311]

I recently took the cover off where the driving sprocket is and noticed that when the clutch handle is pulled tight and the pin is pushed in the camshaft creates a lot of stress on the bolts holding the cover on (pushes the cover away from the engine). It actually stripped the longer bolt and inner threads closest to the clutch arm. Is this amount of stress from the camshaft on the cover normal? Is it possible that the camshaft was installed in the wrong position on the crank arm?

[@smokedkipper5]

Well done, thanks so much, solved a couple of mysteries for me, you are a champion.

[@caleb4790]

Hello, nice video, I just have a bike kit built a few weeks and havnt used it much, the clutch already seems off only after a few hours usage, I can't immagon it would have any of these problems allready or could it be faulty clutch?

[@stephenmichaelolney5880]

Very helpful Allen, thank you

[@aeronmalaluanartsstudio4179]

Please make tutorial about bt80 clutch problem..thank you very much

[@gotnitro4329]

On one of my bikes the clutch is super hard to pull in so you think loosening the collar on the spring will help make it easier to pull in?

[@boombarstick]

Great information I learn something new today.Thank you.

[@seanstinnett1473]

In the case of the clutch pins are hitting the inside of the outer case. Brand new engine. The cable arm is almost all the way to the adjustment on the case as well.

[@poochee2010]

Thanks allen, great job, God Bless you!

[@bernieolivera5632]

Yes very helpful video. I have a new motor. My clutch isn't engaging when I pull on the lever or when I push the lever by hand. I'll have to disassemble the clutch to see if the spring is to tight. On a unrelated subject I noticed in the video that your chain guide is pulling down on the drive side of the chain instead of pushing up on the return side. What is that about? I've never seen that done and honestly it doesn't seem right. I guess there is a reason you do it, please explain. I'm always interested in what people think. It seems that you would want pure drive with no possible obstructions. But I guess it works for you.

[@bikeberry]

You are completely right, the chain tensioner should be pushing up on the return side. This install was done in haste and without proper information. We are constancy trying to improve the quality and content of our videos. I'm not saying he was let go after this video, but he hasn't been part of our team since shortly after this video.

[@Johnsmith-tw2bp]

Hi bike berry, in one of your previous videos talking about magneto contacts one of you guys mentioned weather sealing the chase. I was wondering if you could do a video on this ?

[@seanryan3359]

Where did the ball bearing go? Thanks for your time

[@geoffreygrear937]

Man my bike is a piece of... Just old. Well my chain locked up in the little clearance (im not educated on the parts) but the small sprocket on the motor part lmao! Anyway, the pin that engaged the clutch is not sticking out its about an 1/8 of and inch in! Do you think that bind could have damaged the clutch assembly?

[@an7d7y]

Very good information in this video thanks man!!

[@ericellquist7007]

Great video, thanks for the info. What was the deal with the chain tensioner? I've never seen one like that before, with the adjustment at the top chain. Is this normal? What is the advantage if any?

[@WyattBerry]

Yes, the tensioner caught my eye too and I'm curious as well.

[@SnookTuned]

He explained it above. Apparently the dude that did that isn't with their team anymore.

[@josephcrosby4622]

This video helped me alot

[@ravencruz7576]

I was greasing the bucking bar, and all the ball bearings came out. Could you please help me on how to put th ball bearings back on place. thank you.

[@NorwinViney]

Does the bearing go in before the clutch shaft

[@AmritpalBharaj]

are there clutch bearings? my engine makes a screeching sound and wont let wheel turn smoothly, its also like at one area of a full wheel rotation it tightens up and hard to turn the wheel by hand with less force

[@FadedTSX]

I once took off the flower nut and when I tried to put it back on the clutch had too much pressure against my direction and wouldn’t let me screw it on how it was before. Then it was engaged all the time

[@mrthedudeman]

I want to replace my manual clutch with a centrifugal clutch. Would cut down on all wires. Do they have longer clutch shafts on the output end? I have really wide tires and need the sprocket to stick out further than stock. Does anyone have any safe solution to having the sprocket stick out a little further. I can't bring in rear sprocket and have it dish side out I should prob look into a flat rear sprocket instead of stock one.

[@schutztruppe]

so if I can force peal it and start the engine without using the clutch then the spring is too tight? I yes do I have to take it apart again or can I just adjust the flower nut? my bucking bar

[@saved_yet_so_as_by_fire]

What happens if there's grease on the clutch pads?

[@hardathsingh465]

very good video sir

[@kp4643]

I need a new ball bearings. what size is it and where can I get 1

[@mstzmikebsteviec1119]

My bolt on the sprocket side but a little sprocket keeps loosening and it won't engage anything I have to keep tightening it not sure what to do

[@rjalex]

I am installing a flying horse 80cc. When i went to put the chain on, i took off the clutch plate. The inner shaft was stuck to the outer clutch. After a few taps with a hammer it broke free. Then, i notice that the push pin has no movement. even tapping it with a wood block and hammer, it will not move. Any suggestions. by the way, i bought it from you guys. Asking for help from your support staff also.....

[@Enriquecervantes28]

did they have motorized kits for tricycles too?

[@carlosdejesus8275]

Enrique J Cervantes yes they do but a bit harder to find but they are out there mostly 4 stroke witch means no clutch.

[@mattsteva6878]

I thalt this would help alsome engine and good luck

[@fudddudd1672]

Good video thank you

[@evanferguson30]

I need to know where the ball berring goes Bc it fell out of the clutch

[@losojosdehotspanish2162]

Where can I buy the push pin in the clutch actuator I think I lost it.

[@bikeberry]

call us at [phone] for a special parts request.

[@robeetking7918]

Solved my problem, Thanks

[@raymondshrader3555]

Is'nt there a little key that fits in there somewhere? I think so and if so you did'nt mention it.... Tks for the video but a little more in depth video would be appricated....

[@ernestopdyke5058]

Helpful helping my friend with his he needs to replace the shaft n the cover. This video was a great help thanks so much

[@jasons4586]

helped a lot, thanks.

[@outsidegreaserecords]

good as vid

[@PisstNBrokeOffroad]

Why is every thing out of stock on your website like I was gonna buy it all at once but half the upgrades are out of stock

[@brandonkellogg9590]

My clutch is a bit hard to disengage. It takes more force to pull the lever than it does with other bikes I've built. My cable isn't the problem, and the flower nut is set good. What can I do to lessen the force needed to disengage the clutch?

[@caoimhin27]

maybe hit the gym so you can pull harder

[@thomasthornton8192]

My flower nut stripped on my way home any tips

[@ToTheMaxGaming1]

Could I use any of your engine kits on a BMX?

[@PisstNBrokeOffroad]

Sadly no the frame is to small it would take heavy modification

[@WillB-lv1xg]

Possibly one of their friction drive kits or electric hub kits.

[@dani-yk4dy]

bike berry i openend my 2 stroke engine uo and the piston was there and when i tried to reasembe it i cound not put the it back togther because of 2 black rings on the piston they broke what happens if i turn it on or somthing??? help pleasee!!?

[@kxlucifer]

dani 945. once the rings broke might as well get new piston,piston rings and jug

[@mioso5401]

perfect Video

[@mrjones3869]

You Are Great!

[@olliefarber7457]

What does wif mean he always says it

[@stevenhyde7708]

I put a new chain on and when I reassembled the couch pin wall the way in

[@dougseibel753]

i can move my gear without pulling in the clutch what could be my problem as thr bike can be pedaled without the motor running or clutch engaged and thr chsin is tight and clutch cable run properly could someone please hekp

[@bikeberry]

Give us a call at [phone] and one of our specialist will be happy to help

[@SammyDone]

My bucking bar wont move. plz help. Already released flywheel, no change.

[@kennetik61]

thanks,,,,allen u rock

[@stonefire777]

my kit I bought off ebay came and I notice clutch bar was going out instead of in. anyway I took apart as much as possible. adjusted clutch plate and put back together. now clutch bar goes in normally but, is very tight. checked clutch bar when in normal position and it is engaged. With clutch bar in it disengages. This is backwards I think. Anyway any advice of fixing this problem? Help! Anyone. Please very frustrated right now.

[@bikeberry]

Give us a call at [phone] and our specialist will be happy to help you.

[@junycot6902]

can you tell me? mine is always in engage it wont lock? is it maybe the clctch shaft is broken or?

[@bikeberry]

Check that the clutch cable has proper tension and that the flower nut on the clutch plate is hand tight. If those suggestions do not help call our customer service representatives at 1-800-317-0479

[@GadGetHackss]

Hey guys what's the best engine I can buy I want the best and fastest one from this company please someone reply? thanks

[@kxlucifer]

GadgetHacks 4 stroke

[@kofelee2358]

Thank you ..

[@codibaker8836]

I need help, badly. I was riding yesterday, and when I was coming to a stop, I pulled in my clutch, heard a pop, and then I had no more clutch. I've been having to ride around without a clutch today, and I need to fix this asap.

[@LaCourierInCrysis]

Luv you guys , thanks

[@HighestRank]

The flowered nut was not displayed @ 0:21

[@kenpottinger6479]

Followed the how to remove preload spring but still won't come out

[@flipdollar1]

Do u know what can be wrong if every time I press the clutch it revs high

[@sakenandersson7315]

You are the BEST !"!"

[@JohnHalliday-e9f]

I' bought this motor and instructions are impossible, I opened the plate of the motor to attach the chain and a ball baron fell out .where does it go

[@markmann117]

clutch doesnt engauge or disengauge is it camshaft and berrings?

[@bikeberry]

We'd love to help you. Contact our service team at 1-800-317-0479 and we can work together to get your bike up and running.

[@robeetking7918]

I thought it solved my problem but when i pulled the clutch in it was real hard to pull in then i adjusted the flower nut and it helped a little but then when i was riding the chopper and tried to pull the clutch in it would not pull in and i used both hands and then it snap..so whats up PLEASE HELP ??

[@bikeberry]

Contact our team at 1-800-317-0479 and we can work together to get your bike up and running.

[@mattsteva6878]

man I now there are machine that can make metal parts and pieces like clutch pin and bars and more hopefully you guys can come out with something high performance alot cheaper then a jack shaft so you can use your normal sprocket and shifter and simpler and easier to install so you can get more speed

[@garagerebuilds1604]

very use full ty

[@PappaGahnj]

I found out the hard way that a Skyhawk has a different clutch shaft then the flying horse engine...Skyhawk has smaller keys, half moons...flying horse takes 2 flatkeys...Skyhawk shaft is also a bit longer...

[@masterblaster3468]

why cant i put the pin back all the way in..help?

[@asphaltcowboy7868]

I have a clutch that won't disengage..but I can't get the clutch shaft out to adjust it..

[@brittanykobayashi3890]

awesome

[@waqarjamil6365]

So I i.tirws everything and my clutch won't engage thengine

[@kp4643]

It there an easy way to adjust the collar

[@mrmerhtin3625]

THANK YOU!!!

[@joshuacoronado4657]

This So helps🤘😎👌👍😋👉💯

[@matthewvanwamel5843]

thanks

[@jamesmata2945]

I can't put on my drive sprocket cover plz help.

[@bikeberry]

Contact our customer service representatives at 1-800-317-0479. We'd be happy to help you solve any problems you may have.

[@michaellurch9472]

Same but mine isn’t a bike berry brand. Did you ever figure it out?

[@alexbayne289]

When I go full speed on my bike it'll bog down and go slower, I don't know why. It also seems to be vibrating more than it did previously to this problem. This all surfaced after the motor was taken off of my bike and remounted.

[@daniel29646]

Air to fuel mix is too rich = too much gas+oil and no air, Remove carborator plastic cover

[@DataDiggerDon]

Great video...thanks for sharing your knowledge. #DataDiggerDon

[@archielamarr2950]

Ok my 80cc engine clutch bar only goes outward it doesn't go inward like I've seen on most videos it only moves outward away from the bike how do you get the clutch cable attached so that you can pull it in the direction it's moving which is outward that is the problem I'm having with my clutch on my 80cc how do you get the clutch arm to move inward like it's supposed to like I've seen and every other video I need some help guys

[@bikeberry]

Hey Archie, Were sorry to hear you are having this problem. Give us a call at [phone] and one of our technicians would be more than happy to assist you.

[@archielamarr2950]

Well i reset the insides of the clutch and have got it now so that the bar moves in the right way how it was the plate and spring was so tight that the spring was fully comprised on it self so there was no way to move the plate at all i lossed the plate and streched out the spring a bit and put it back together and didn't tighten the plate more then flush plus about 6 to 8 turns now the bar moves as its meant to and once i get a new cable it will be good to go

[@bikeberry]

Great! Keep us updated. We'd love to hear about it once it all comes together.

[@archielamarr2950]

Well i need to buy a new cable on the first and i will have the rest of the bike done this Wednesday so after that it should be online and what i have heard that my bike should be able to go about 40mph is that right? Its what i have been told by others so i don't know

[@bikeberry]

That's correct. The top speed varies between builds but it is usually in the upper 30s. We've even heard of special builds reaching into the 50s

[@crazyredneck9709]

Omg thank you!!!!!!!!!!!!!!!!!!!!!

[@cypionate250]

Thanks good info.

[@jessicakarns8502]

What about if it is too loose

[@bikeberry]

Give us a call at [phone] and we can properly assist you

[@williamlewis999]

If my clutch arm is in to far and it won't start up

[@thebluecreeper2574]

The main nut on the side of the buck bar keeps coming loose.

[@PisstNBrokeOffroad]

My clutch is locked in gear plz help

[@PisstNBrokeOffroad]

+lucajo16 I fixed it it was just the rotor was stuck

[@jlray565]

But where does the bearing go?

[@dannyjeansonne8352]

My clutch out of motor moves freely no tention on it

[@alexvalencia6088]

How do you take the sprocket out the one where the chain is on the motor one

[@bikeberry]

A deep socket should be able to undo the drive sprocket. Be sure to secure the sprocket in place when loosening the nut.

[@djlys8150]

Ty

[@bikeberry]

Entirely our pleasure.

[@kurtsigmund1369]

my clutch arm doesn't reach shaft what do I do

[@steveplotnersr8521]

How to properly install a spark plug

[@mattsteva6878]

but you have to understand the push pin is to short I got the push pin several time and everytime I order one it was to short when it was all assembled the push wasn't almost sticking out were the flower nut is on the pad a lot of times to short and kind of sunk in the flower nut like it to short so it make it real hard to make the clutch pad work right with out making the pad slip when drive it and and make the clutch handle to tight to pull so you guys really need to exception on the those pieces and the push pin to make sure it long enough before shipping it out ya that the only thing keep to completing my project

[@dennisskindzier8721]

Fired up my 49cc for the 1st time today...was running fine...then the little gear on the clutch is just wore compleately off