R&D powervalve yamaha cylinder

W

waxhead

wannabe backflipper
Location
gold coast
give me the measurements from the top of the cylinder to the top of the exhaust port
also the measurements from the top of the cylinder to the top of the transfers
 
MTRHEAD

MTRHEAD

Location
MotorCity
Eric sears said:
126.5mm
Click to expand...
Probably was a 6 or 8mm with 132 ktm or rad rods and a .125 or .060” baseplate if it had round tops. If it had flats could of been 8mm with 132 ktm/rad rods or Kawasaki rods (Suzuki tiger shark). either way it was more than likely for a 6mm or 8mm probably

Since with 8mm it comes out timing wise to 198/130 or 196/128. Common race timing
 
Last edited:
W

waxhead

wannabe backflipper
Location
gold coast
MTRHEAD said:
Probably was a 6 or 8mm with 132 ktm or rad rods and a .125 or .060” baseplate if it had round tops. If it had flats could of been 8mm with 132 ktm/rad rods or Kawasaki rods (Suzuki tiger shark). either way it was more than likely for a 6mm or 8mm probably

Since with 8mm it comes out timing wise to 198/130 or 196/128. Common race timing
Click to expand...
6m with 133 rods is a 130mm cylinder so it may be a 5mm with stock rods 125mm rods
That give you 199 and 125 which will run ok depending on what else is hanging off it
 
N

Nico2jz

Location
CT
FA2547B3-0CAC-4476-A8E6-E40174D89D08.jpeg
Just bought this motor. It’s apparently a 4mm stroker R&D but beyond that I have no idea. Bought it on a whim should be here tomorrow.
 
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