Nice job! How did you come to have all those pistons?
I hope you removed the cover/seal from the clutch side bearing? Seeing it has the proper seal on the other side you want some
lubrication to get in there.
I went to Europe in April and was able to visit a couple scoot "swapmeet". Still lot of NOS parts being sold there. There was one guy with a full trunk of NOS pistons.
These are not sealed bearings. They're polyamide ball caged bearings (instead of steel caged). They're supposed to be quieter, stiffer and more flexible...
So wouldn't you want the 'open' side towards the lubrication?
I got it now. In the 7th photo of the original post, it looks like there is a gap between the black cage bit and the outer bearing race. So oil can get past that.
What's the point of even keeping the black seal on, when it's on the inside facing the gears? Why not just take it out?
You are right. I was wondering why as well. Unfortunately, I did not know you can remove the bearing seal. Should I worry about the bearing not have enough lubrication?
V oodoo wrote:
Oh, how I love seeing battered old motors being lovingly coaxed back to life. You are doing it first class w/ all quality new bearings etc.
I've always wondered about those yellow inserts in the main crank bores. I always thought they were brass and yours look to be, but I scrapped a motor that had plated iron inserts. They weren't dimpled all around in the case like yours, seemed original and I've seen enough of them to think they are maybe factory items in some motors?
The dimples are not standard; someone has done this to stop the bearing from moving in the brass sleeve. I often see this on Asian bikes; this area is worn out. The right way to resolve this issue is to machine new brass sleeves and install. The early bikes had brass sleeves and later went to steel. Hope all that helps.
I see your point. I'm not original owner of this engine until 5 summers ago. It has 40+ years of unknown history.