Roller or bushing on wrist pin

europorsche914

europorsche914

Member
just bought a new crank for my 67cc but i do not know whether its a roller bearing or bushing connecting rod (wrist pin end). It came without a bearing in it and i do not want to tear the motor down and discover i need another part.
 

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what did the seller say that was for ? he should know if it take a bushing or a bearing.
Norman
 
it was from boygofast and he didnt say jack...(no surprise there) I dont want to tear the motor down and waste another set of gaskets... norman do you have the dimensions for the connecting rod bushing or bearing?
 
BGF? Warning, high probability it isn't the correct part. He rarely sells what is advertised in his listings and pics and description hardly ever match what is purchased on fleabay.
 
europorsche914,

The engine I got from BGF had a needle bearing at the small end of the rod. I would think that if your new crank was a bushed type, the bushing would be installed?

I have this engine, (BGF), completely apart...give me a call tomorrow and I'll give you the I.D. dimension of the rod I have.

Jim
 
europorsche914 said:
will do thanks jim. Do you have any cool new parts i can spend my money on? (^)
Click to expand...

I am building a bike for a good customer...He brings in a lot of design/machine work for the shop. He wants this bike as a Christmas gift for his wife. I will for the most part make everything perfect. I should have pics in a few days. Most of the parts will be specific to this bike...which is a discontinued model from GT.

At this point I really don't have enough experience with different bikes to be able to offer universal parts...I am working on it!

Jim













i
 
Looks like a roller bearing to me. Those notches in the sides are the indicator, the bush has clean sides. Have fun, Dave
 
thats what i figured so im pretty sure this will work as a replacement crankshaft for my bushing motor. Does anyone know the diameter of the wrist pin? Ill get to ordering a bushing (14mm od) as soon as i know the wrist pin diameter.
 
i thought that you couldnt put a needle bearing in a bushing motor but you could but a bushing in a bearing motor. Maybe im confused what is the diameter then of a bushing motor's connecting rod-wrist pin end?
 
Not sure of the measurement, but you can't interchange them. I understand the bearing cage is too large for a bushed type rod end. The bushing then would be too small for a bearing type rod.
 
yea thats what i figured so im gonna buy a 14mm od 10mm id bushing from an outside company and fit it. It will be of higher quality than the original. I talked to jim and he suggested a phosphorus bronze bushing.
 
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