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.
Roller or bushing on wrist pin
- Thread starter europorsche914
- Start date
![1214081858[1].jpg](/data/attachments/3/3591-b90e35f148241dafa506418310c48da3.jpg)
Take about 5-10 min to get the top apart on your motor and find out!
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?
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
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
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.will do thanks jim. Do you have any cool new parts i can spend my money on?
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.