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Post by Razor on Sept 14, 2018 11:48:36 GMT 1
Am I correct in thinking that +2.5 rebore the biggest the YPVS cylinders will take (safely)
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Post by midlifecrisisrd on Sept 14, 2018 13:42:29 GMT 1
To be honest 2mm is about it
Some say either 1ua or 31k can go to 2.5 but can't remember which one
Personally I wouldn't want to chance it
Steve
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Post by Tobyjugs on Sept 14, 2018 17:22:52 GMT 1
Yep I'm with midlife on this one
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Post by bare on Sept 14, 2018 17:33:29 GMT 1
There is also the PV valves fit to consider with silly overborings
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Post by midlifecrisisrd on Sept 14, 2018 18:26:14 GMT 1
There is also the PV valves fit to consider with silly overborings Yep, anything over 1.5mm needs pv's trimmed as well as head gasket Anything over 1.5 I'd be looking for replacement cylinders Steve |
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Post by Razor on Sept 14, 2018 19:18:58 GMT 1
At the moment I have the engine (and a spare) at 2.5. The original engine is in the bike now and running as it came with pistons etc
but, one side slightly gives more pressure than the other. But, it starts and runs ok - just was thinking whether to get liners renewed
and go back to original bore size
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