Chain does not fit rear sprocket - please help

[atomicmiata]

Hi,
I just bought an engine kit off ebay from boygofast.
an 80cc kit. (I know it is probably -70cc)
the chain pitch does not jive with the rear sprocket pitch.
(it appears that the chain would need to stretch considerably to fit)
anyone seen this before?
should I buy a new chain? what size?
or buy a new sprocket? if so, from where?

photo below:

http://www.atomicweb.com/images/100_1059.JPG

best regards,
steve in frederick, md

 

[MotorBicycleRacing]

Have complained to boygofast yet?

Have him send you the right parts or he gets a negative
Saying he has no warranty is one thing but this is different

Measure the pitch on the chain
Stock chains are junk anyway

probably the machining on the sprocket is off

How does it fit on the front sprocket?

Hi,
should I buy a new chain? what size?
or buy a new sprocket? if so, from where?

photo below:

http://www.atomicweb.com/images/100_1059.JPG

best regards,
steve in frederick, md

 

[HoughMade]

Agreed- likely a rear sprocket issue, but one that could be solved with some grinding- just taking off some edges and chrome plating on the teeth can do wonders.

 

[s_beaudry]

Have complained to boygofast yet?

Have him send you the right parts or he gets a negative
Saying he has no warranty is one thing but this is different

Yikes...

You are talking about someone who thrives on negative feedback and not answering ANY emails!

May need to rethink this idea!

 

[relaxxx]

Forget the 44T, get at least a 36t. I'll never go back to 44 again. It's a crime against nature, those sprockets.

 

[atomicmiata]

44T sprocket

well I live on a steep mountain and perhaps I need it geared down.
I will trade off not pedaling uphills for lack of top speed.

 

[atomicmiata]

420 size chain fits the sprocket pitch

>

Have complained to boygofast yet?

yes I did yesterday and am still waiting for a reply.


>Measure the pitch on the chain

I took the sprocket to a motorcycle shop today to try a different chain on it.
a 420 sized chain fit the pitch of the sprocket perfectly, tho a 420 is quite a bit wider which is not good.
anyone know of another size chain that has the pitch of a 420 but is narrow in width?

thanks!
-steve in frdeerick, md

 

[HoughMade]

#41- about the same outside width as the standard 415, wider between the plates, but the outside width is what you are concerned about. About $13-$14 for 10 feet at Tractor Supply or lowes or any small engine shop.

However, I would still knock the rough edges off the sprocket.

Curious- were yopu able to get the chain to seat when the sprocket is off the bike- in other words, can you get several links in a row to fit the sprocket?

 

[atomicmiata]

#41- about the same outside width as the standard 415, wider between the plates, but the outside width is what you are concerned about. About $13-$14 for 10 feet at Tractor Supply or lowes or any small engine shop.


that sounds like a winner.
thanks to all for your thoughtful replys.


Curious- were yopu able to get the chain to seat when the sprocket is off the bike

no, the stock chain will not seat into the teeth around the sprocket all the way.
I guess the supplied kit chain is not a 415 as it supposed to be...

 

[HoughMade]

Sounds like it- try the #41.

Here is a link to a good chain info page.

http://www.azusaeng.com/chain/mcyclchn.html