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[QUOTE="Bateman147, post: 504587, member: 37509"]
Hi -

I'm going to be working on a YZ80 for a friend (I don't have it in hand yet).  It's in a YSR chassis, and used for mini roadracing.  It apparently has a later model cylinder and piston for a larger bore.  The owner thinks that makes it close to a 90.

I'm looking for advice/specs on tuning this combination.  I'm assuming a 1mm squish band at the approx. angle of the piston crown (5 degrees or so) will be correct.  Any help with suggest port heights, cylinder head volume, etc would be greatly appreciated.  I'm quite familiar with Honda RS125 roadrace engine tuning, but don't have any experience on this particular engine.

The pipe the owner says he'll be buying for it is from Team Calamari.  I don't have specs on the pipe yet, but should soon.  I'm assuming it will be run on VP C-12 fuel or the equivalent, but I will confirm that prior to working on the bike.

I really appreciate any advice anyone can give.

Thanks!

Michael
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