Drive chain sprocket

cliff880

New Member
Nov 13, 2008
3
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0
florida
I finally recieved my 80CC engine this week and found that the chinese engrs.should never write the instructions!!Basically the bike is finished and looks A #1 but I have two problems that I can't seem to solve the first is the fact that when I tried to install the drive chain IT BINDS Against the engine block and I can see where the chain clearance is too close! Problem # 2 is that none of the color coded wiring matchs except the black.I finally just walked away until maybe someone can help me
Cliff
 

Bikeguy Joe

Godfather of Motorized Bicycles
Jan 8, 2008
11,843
235
63
up north now
Welcome to the forum...someone may be able to give you more insight to the sprocket problem. I have only heard of it once before. I think you could dremel out the area that the chain rubs on, but I'd wait for a more intelligent answer to that one.

Color coded wires....Blue to green or blue. Black to black. White wire is to be capped off and set out of the way as to not be grounded out, it's a wire to run a light with.
 

Allan

New Member
Nov 23, 2008
17
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Ontario, Canada
cliff880,
I've had the same problem. If the chain is rubbing against housing you need to grind down housing a little. It may also be rubbing against housing because the teeth on the sprocket are not seated. Lay your chain on a flat surface, take your sproket and roll it down the chain. If it pulls the chain up, grind the corners off the teeth a little. Do this until the sproket runs freely through the chain.
Regards,
Al
 

cliff880

New Member
Nov 13, 2008
3
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0
florida
cliff880,
I've had the same problem. If the chain is rubbing against housing you need to grind down housing a little. It may also be rubbing against housing because the teeth on the sprocket are not seated. Lay your chain on a flat surface, take your sproket and roll it down the chain. If it pulls the chain up, grind the corners off the teeth a little. Do this until the sproket runs freely through the chain.
Regards,
Al
Al I'll check out the grinding idea,guess I'll have to remove the drive sprocket first then use a dremel.
 

xPosTech

The Old Master Motorized Bicycle Builder
Oct 23, 2008
209
0
0
SETexas
Does the chain rub when wrapped on the engine sprocket only? If it rubs when wrapped around both engine and wheel sprocket it's chain line alignment.

I noticed on my engine that the sprocket is not symmetrical. I.E. the teeth are not ground on the centerline of the hub. If the sprocket were reversed on the clutch spindle the teeth would move away from the housing. Maybe yours is similar?

Ted
 

cliff880

New Member
Nov 13, 2008
3
0
0
florida
Al I'll check out the grinding idea,guess I'll have to remove the drive sprocket first then use a dremel.
Al,I used the dremel and ground the small flange behind the drive sprocket and although not perfect it seems to work alot better,I'll finish it tomorrow,I've learned to walk away sometimes Cliff880
 

vkray

Member
Jun 26, 2020
62
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18
76
cliff880,
I've had the same problem. If the chain is rubbing against housing you need to grind down housing a little. It may also be rubbing against housing because the teeth on the sprocket are not seated. Lay your chain on a flat surface, take your sproket and roll it down the chain. If it pulls the chain up, grind the corners off the teeth a little. Do this until the sproket runs freely through the chain.
Regards,
Al
I also am having the very same problem. I removed the sprocket, and ran the test, chain on a flat surface, and it did not stick or raise the chain! Wal la, fixed, nope still sticks and binds (BAD CHAIN)?
 

curtisfox

Well-Known Member
Dec 29, 2008
5,141
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minesota
I also am having the very same problem. I removed the sprocket, and ran the test, chain on a flat surface, and it did not stick or raise the chain! Wal la, fixed, nope still sticks and binds (BAD CHAIN)?
Need to take straight edge and line up the sprockets, must touch both sides of the sprockets front and rear. What happens is chain is touching on one side of sprocket and climbing up, and binding...........Curt 2008 post you replied to.
 
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Brianr1074

New Member
Jul 12, 2020
11
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46
Hello everyone I have a chain sprocket problem, I have 2 bikes same prob on both. How do I check the alignment of the chain?
pictures soon
 

Bikeguy Joe

Godfather of Motorized Bicycles
Jan 8, 2008
11,843
235
63
up north now
1.) read through this thread.
2.) Sight down the chain. Is it straight?

It should be or you'll have that.

3.) Thanks for the memories.
 

curtisfox

Well-Known Member
Dec 29, 2008
5,141
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minesota
Sighting don't really cut it straight edge is the best touching both front and rear of sprockets, no gaps..........Curt