Cateye problem - Pocket Bike Forum - Mini Bikes
 
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post #1 of 8 (permalink) Old 2 Weeks Ago Thread Starter
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Cateye problem

So I bought a brand new 2 stroke motor recently and it has maybe 5 miles on it. The other day while riding I think I lost the clutch. Motor runs fine but when you accelerate it barely moves and sometimes not at all. What would I be looking for to insure itís the clutch? Tranny seems to work just fine but is there something specifically I should be looking at to know if I need a new clutch? Maybe itís something else? Any help would be appreciated. Typical stand up 49cc motor with exhaust out the rear.
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post #2 of 8 (permalink) Old 2 Weeks Ago
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Re: Cateye problem

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Originally Posted by Thearm420 View Post
So I bought a brand new 2 stroke motor recently and it has maybe 5 miles on it. The other day while riding I think I lost the clutch. Motor runs fine but when you accelerate it barely moves and sometimes not at all. What would I be looking for to insure itís the clutch? Tranny seems to work just fine but is there something specifically I should be looking at to know if I need a new clutch? Maybe itís something else? Any help would be appreciated. Typical stand up 49cc motor with exhaust out the rear.
Simply pull the transmission off and look at the clutch...if it's smoked you'll know in an instant

Also make sure your carb is tight...

Good luck

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Last edited by CAM2; 2 Weeks Ago at 01:05 PM.
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post #3 of 8 (permalink) Old 2 Weeks Ago Thread Starter
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Re: Cateye problem

Carb is tight but what would a bad clutch look like?
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post #4 of 8 (permalink) Old 2 Weeks Ago
Re: Cateye problem

Your clutch is mounted to the flywheel w/ 2 bolts, there are 2 arms and a spring that's in between. It keeps arms close so it don't turn the wheels when you started. The spring tension and weight of the clutch arms makes up the RPM of the engine and when the arms stretch the spring and hit the bell. If the spring is weak or broken it would act like your bike, but like CAM2 said if the pads are worn down to alum its going to slip also and make noise. Like CAM2 said, pull the trans, you will know right away believe me, lol. When you find the problem, come back here and we can make a plan, you want more horsepower, we can help you. See if I have some photos??
Attached Images
File Type: jpg Custom Piston Port Eng 1.jpg (506.7 KB, 5 views)
File Type: jpg Modified 49cc Piston Port Engine4.jpg (296.2 KB, 4 views)
File Type: jpg Modified Piston Port Clutch2.jpg (505.7 KB, 4 views)
File Type: jpg Modified 49cc Piston Port Engine2.jpg (412.4 KB, 3 views)
File Type: jpg Exploded Piston Port Engine.jpg (30.0 KB, 3 views)

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post #5 of 8 (permalink) Old 2 Weeks Ago Thread Starter
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Re: Cateye problem

Here are pics of what Iím looking at
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File Type: jpg 2413AC4C-2418-42D2-B521-617B2FA983E2.jpg (326.6 KB, 7 views)
File Type: jpg 546DA9D9-5299-402F-BAB2-B6801CE8441E.jpg (265.5 KB, 6 views)
File Type: jpg 478477FD-BAFF-4F8E-AFBE-28328AD13828.jpg (265.4 KB, 7 views)
File Type: jpg 48112829-FB10-4D41-8813-B72E877A4056.jpg (416.1 KB, 6 views)
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post #6 of 8 (permalink) Old 2 Weeks Ago
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Re: Cateye problem

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Originally Posted by Thearm420 View Post
Here are pics of what Iím looking at
Im assuming you bought the engine in "used/pre-owned condition".


There seems to be an abundance of oxidation which would prohibit proper function of the clutch.

Pull the clutchbolts off that hold the clutchpads onto the flywheel , de-oxidize them and deoxidize the clutch bolt mount holes on the pads and reinstall the bolts without the wavy washers...

Sometimes to get the correct fit the pad mount must be filed thinner so it doesn't have any friction stopping it from engaging smoothly when centrifugal force works its magic..

With the clutch pad bolts tight the arms should swing free without the clutch spring installed.......

Those bikes also have a freewheel mechanism in the rear rimhub that goes bad.......

Good Luck

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Last edited by CAM2; 2 Weeks Ago at 07:00 AM.
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post #7 of 8 (permalink) Old 2 Weeks Ago Thread Starter
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Re: Cateye problem

Thanks for the advice. I bought it brand new last year. Maybe has 5 miles on it if that
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post #8 of 8 (permalink) Old 2 Weeks Ago
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Re: Cateye problem

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Originally Posted by Thearm420 View Post
Thanks for the advice. I bought it brand new last year. Maybe has 5 miles on it if that

Oh ok...That's what I originally thought but wasn't sure....That transmission kinda threw me off...

Now that Im on a better mode of viewing your pics and a couple RedBulls..lol..It looks like it has too much oil inside of it too by all that black behind the bell also to mention its from an X1 pocketbike and needs to be mounted horizontally to keep seepage to a minimal....

Take some 100 grit sandpaper and clean up all that mess inside the bell and hit the gook with brakeparts cleaner......


Looking at the clutchspring it looks like its stretched on there pretty tight too and judging by the thickness of pad material left you should buy a new clutch as yours looks like its past its half-life already

I don't know how much you know about springs but a spring that's at its relaxed point should exhibit only a certain tension pressure while the spring coils appear to be relaxed with very minimal spread.

The way your spring is stretched looks like it engages at like 6 grand.....Now I know why youre happy with the engine the way it is...It appears to be a 43cc 40mm bore engine and engaging the clutch that high would cure any sluggish takeoff problems relating the engine being severely underpowered for anything rideable....LOL..

It looks like a Chinese kid put a steel clutch spring on an aluminum clutch....Once you get the clutch engagement in the right zone youll notice the takeoff deficiency a lot more...Ö.




The pic on the left is a new clutch....Middle pic clutch is smoked ;-no pads left and Right pic is a 3 shoe clutch mod where 1 shoe is missing a pad after1 ride.....LOL
Attached Images
File Type: jpg 017-3.jpg (123.5 KB, 3 views)
File Type: jpg 466.JPG (95.3 KB, 5 views)
File Type: jpg 039-3.jpg (127.1 KB, 6 views)

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Last edited by CAM2; 2 Weeks Ago at 01:12 PM.
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