Continuing
on my YG1 engine.
In my earlier post I mentioned I found a NOS standard cylinder but the vendor only had a 1st oversize piston (0.25) over. I managed to find one on eBay but they wrongly sent a 1st oversize one. They were good about it and are sending the correct one but the wait is tough as its usually 4 to 6 weeks from the US to Malaysia.
If you remember I mentioned that the local bike shop said they could rebore my bike to 1.50 over..well I sent them the cylinder and old piston and I got them back 2 weeks ago. The new piston quality is not too good as the crown is pretty rough with one or two bumps from the casting process.. It also looks like the guy who did the rebore sanded the skirts a bit. Good sign as he probably checked the fit of the piston. The rings are unbranded.. They just have "trim 1" and "trim 2" marked on them.. I'm gonna install trim 1 top and trim 2 bottom unless anyone has any better ideas?
The rebore was supposed to be to 1.50 over but they ended up having to do 1.75 as the bore was too damaged to do a 1.50. Looks like it was done correctly as the piston sits square in the bore with minimal rocking.
I'll probably install it this weekend and hopefully get to ride it. Will keep you guys updated.
In my earlier post I mentioned I found a NOS standard cylinder but the vendor only had a 1st oversize piston (0.25) over. I managed to find one on eBay but they wrongly sent a 1st oversize one. They were good about it and are sending the correct one but the wait is tough as its usually 4 to 6 weeks from the US to Malaysia.
If you remember I mentioned that the local bike shop said they could rebore my bike to 1.50 over..well I sent them the cylinder and old piston and I got them back 2 weeks ago. The new piston quality is not too good as the crown is pretty rough with one or two bumps from the casting process.. It also looks like the guy who did the rebore sanded the skirts a bit. Good sign as he probably checked the fit of the piston. The rings are unbranded.. They just have "trim 1" and "trim 2" marked on them.. I'm gonna install trim 1 top and trim 2 bottom unless anyone has any better ideas?
The rebore was supposed to be to 1.50 over but they ended up having to do 1.75 as the bore was too damaged to do a 1.50. Looks like it was done correctly as the piston sits square in the bore with minimal rocking.
Piston. you can barely make out 1.75. Arrow points to exhaust port. Get this wrong and the bike won't run.
Nice and new.
The skirts are sanded a bit.
Rings. also marked 1.75. Trim 1 will go in the upper position.
Bigger bore.
I'll probably install it this weekend and hopefully get to ride it. Will keep you guys updated.
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