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| Motorized Bicycle General Discussion Topics on bicycle engine kits, help articles, repair and modifications for your motorized bicycles |
Roller or bushing on wrist pin
Discussion at Motorized Bicycle Engine Kit Forum in the Motorized Bicycle General Discussion forum. just bought a new crank for my 67cc but i do not know whether its a roller bearing or bushing ...  | | 
12-14-2008, 07:03 PM
|  | Motorized Bicycle Elite Member | | Join Date: Jun 2008 Location: Lancaster, PA / Newark, DE
Posts: 156
| |  Roller or bushing on wrist pin
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. |
12-14-2008, 07:47 PM
|  | Motorized Bicycle Elite Member | | Join Date: Sep 2008 Location: Seattle
Posts: 442
| |  Re: Roller or bushing on wrist pin
 Take about 5-10 min to get the top apart on your motor and find out! |
12-14-2008, 07:55 PM
|  | LORD VADER Moderator | | Join Date: Jan 2008 Location: pampa texas
Posts: 2,095
| | Re: Roller or bushing on wrist pin
what did the seller say that was for ? he should know if it take a bushing or a bearing.
Norman |
12-14-2008, 08:44 PM
| | Motorized Bicycle Elite Member | | Join Date: Jun 2008 Location: Lancaster, PA / Newark, DE
Posts: 156
| | Re: Roller or bushing on wrist pin
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? |
12-14-2008, 09:20 PM
| | Motorized Bicycle Newbie | | Join Date: Sep 2008
Posts: 12
| | Re: Roller or bushing on wrist pin
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. |
12-14-2008, 11:17 PM
|  | MANIC Mechanic | | Join Date: Sep 2008 Location: Clearwater, FL
Posts: 1,122
| | Re: Roller or bushing on wrist pin
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 |
12-14-2008, 11:31 PM
| | Motorized Bicycle Elite Member | | Join Date: Jun 2008 Location: Lancaster, PA / Newark, DE
Posts: 156
| | Re: Roller or bushing on wrist pin
will do thanks jim. Do you have any cool new parts i can spend my money on?  |
12-14-2008, 11:47 PM
| | MANIC Mechanic | | Join Date: Sep 2008 Location: Clearwater, FL
Posts: 1,122
| | Re: Roller or bushing on wrist pin
Quote:
Originally Posted by europorsche914  will do thanks jim. Do you have any cool new parts i can spend my money on? | 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 |
12-15-2008, 12:04 AM
|  | Motorized Bicycle Elite Member | | Join Date: Jan 2008 Location: Long Beach Ca
Posts: 572
| | Re: Roller or bushing on wrist pin
Looks like a roller bearing to me. Those notches in the sides are the indicator, the bush has clean sides. Have fun, Dave |
12-15-2008, 08:18 AM
|  | Motorized Bicycle Elite Member | | Join Date: Mar 2008 Location: Treasure Coast, Florida
Posts: 747
| | Re: Roller or bushing on wrist pin
I agree with Egor, the notches are for more oil to get to the rollers in the bearings cage.
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