TOPIC:

2 years ago I rebuilt the top end of my 305 but since oversized cylinders are unobtainium I couldn't do a rebore. The right cylinder was scored so I replaced that piston with a new one, but honing did not quite smooth out the bore so the rebuild was not entirely successful. It ran but smoked and blew oil on that side and lacked power.  I rode it up and down my street 15 total miles that summer, never getting above 45, and it hasn't been started since.

So after years of searching I finally found used cylinders that look good, but I won't know for sure until they arrive and get them measured. Assuming they are good to use with standard 61 mm pistons, do I need to do anything other than install it with new gaskets? Can I go with the present rings, which only have 15 miles on them?

 

Are these the rings that where fitted when it melted a piston ? If not I would think you will be ok but if they are, for the price I would replace (especially given the problems finding barrels)

Wookie58 wrote:

Are these the rings that where fitted when it melted a piston ? If not I would think you will be ok but if they are, for the price I would replace (especially given the problems finding barrels)

 

No that was a more recent thread from a different poster. My right skirt was scored along with the right cylinder, but I had the bores honed and replaced the bad right piston (kept the left one) and installed new rings on it. So all of the rings, and the right side piston, only have 15 miles on them. The left piston looked fine so I kept it and it has new rings with only 15 miles.

 

You should be fine as long as the pistons and rings have no sharp edges or burrs.


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My used cylinders arrived and they look great. I still need to get them measured and looked at by a pro but other than not seeing cross hatching I see no wear at all and they certainly haven't been overbored. Should I get them honed? I suppose with the rings being new-to-the-cylinders that I should, huh? Hate to take any metal off but guessing I need that hone

Yes, they should be honed.