Depends on your location but there is a guy here in california mike manning is able to do it .But that also depends on what stage piston (Bore) your engine is at . Also depends on how much your willing to spend if the engine for example is at 52.80 then i believe the next piston size would be outlaw and there not cheap .
Well the reason why I bring up a shop out of state is because they can do these things for these prices
"Typically an unblueprinted Yamaha will put our about 11.5-12 hp with a pipe,
while after blueprinting it should make 16+ hp.
As for the difference in the rebuild costs, the $80 labor + parts is for
what we refer to as a "top-end" rebuild: new piston, ring, top rod bearing,
circlips, and labor to torque plate the cylinder, hone to correct clearance,
fix piston, gap ring, adjust for optimal exhaust port timing, and cut piston
for optimal intake timing, reassenble and check cc's and squish.
The $160 + parts is for a total rebuild, including all the above plus;
disassemble crankshaft, straighten rod, fit new bottom rod bearing and
thrust washers, replace main bearings and seals, reassemble and fit ignition
system, plus all work indicated above.
My advice would be, if you don't know the history of the engine, box it up
and send it to me. I'll examine it and assess what you have and what it
needs. Then, before I do anything, I'll confer with you about what is
required and what the cost will be. If you choose not to proceed, I'll box
it back up and send it back and all you'll owe me is the shipping.
If you choose to proceed, we'll get started on it."
They also do cryogenic treatment to the engine, which is said to greatly extend engine functionality. Can I have some contact info for this man in California to inquire on his price?
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