My first enguine was rattly since new- never got worse, still running as far as I know (sold it a year ago) the guy never came back, and I told him to if he had questions or problems.
__________________ If it ain't broke, and you mess with it long enough, it will be.
My engine is still getting better, seems like bottom end torque has gone up as it further breaks in. If it doesn't grenade, it should last some number of years.
Customers often don't understand why I put 50-100 miles on a new bike/engine before I sell it to them. The difference in power is the main reason as well as differences in ease of starting and overall engine operation on a new engine and one that is slightly broken in is noticeable.
One new engine recently, wouldn't go faster than 15mpg unless I was going down hill. It took dozens of repeated short trips at varying throttle settings to finally get those rings to seat. Its up to 21 mph after 18 miles and should top out at 25mph.
I never ended up getting that hole drilled all the way through so I replaced the roller bearing with a solid brass*?* bushing from livefastmotors. I am also running oil with 20% castor oil.
Thanks for all the ideas.
A theory for one of the failure modes of the roller bearing is that it might "walk" on the wrist pin and become off-center, then fail.
The bike is running well and so far has about 4 hours. I need to figure out which type of front brake will fit and order that.
Here is some pictures of my work in progress. Thing is the bushing on the wrist pin did not look bad in the first place. I just have some little marks or scratches on the cylinder walls, but not much. It's kind of like some crome pealed off or something that is where the red arrow is pointing to. Just a little spot and a little scratchy in another black arrow. I guess I will sand the area down where the bushing was and go with another bushing. Did a compression test was at 120 lbs and after 1/2 hr it was 118 lbs.
Sand off the old bearing surface with some fine sand paper.
Last edited by sisdavid : 05-23-2008 at 04:44 PM.
Reason: Forgot something.
How did you press your new bearing in? Don't want to smash it. Sould be able to pick up some breaks on e bay.com. also my little cardboard gasket on the bottome riped in two, wonder if anyone knows if that regular stuff you get at Autozone that is on a role like tar paper should work right?
Last edited by sisdavid : 05-23-2008 at 04:52 PM.
Reason: forgot
How did you press your new bearing in? Don't want to smash it. Sould be able to pick up some breaks on e bay.com. also my little cardboard gasket on the bottome riped in two, wonder if anyone knows if that regular stuff you get at Autozone that is on a role like tar paper should work right?
The bushing went in perfectly for me in the table vice. Con rod was against vice, board between vice and bushing. I held the parts with one hand and spun it into place with the other.
I used the autozone roll to regasket head and intake manifold, no issues so far (6.9 hrs). That permatex gasket shellac helps seal it too.
Re: wrist pin needle bearing lubrication holes 
Linear Mode
