07-17-2006, 12:59 PM #1
YAMAHA OEM to PRO-X Size comparison GP1200R
Red: 79.899 ~ 79.902 (3.1456 ~ 3.1457)
Orange: 79.903 ~ 79.906 (3.1458 ~ 3.1459)
Green: 79.907 ~ 79.910 (3.1459 ~ 3.1461)
Purple: 79.911 ~ 79.914 (3.1461 ~ 3.1462)
1-5 cylinder gets an A piston
6-10 cylinders gets a B piston
11-15 cylinders gets a C piston
16-20 cylinders gets a D piston
In Pro-X 7170
Red = A
Orange = B
Green = C
Purple = D
Pro-X piston kits can also be listed by other retailers as part numbers
24-7170A----Lynn Vick Products Pro-X kits
7170A-------LA-Sleeve Pro-X Kits
7170PX-A----RIVA (Yamaha Pro-X Kits)
07-30-2006, 12:33 PM #2
That spells it out.
07-30-2006, 02:41 PM #3
I run 1-size smaller piston for the hole on my ski......
07-30-2006, 08:24 PM #4
Interesting. I have a brand new PRO-X A piston and it feels tight (skirt area in the top of the bore) in the 0 and the 10 cylinder. The used pistons a PRO-X C feels much looser in the cylinders. The piston skirts must collapse in with wear. A good reason to break the ski in a little before hammering it.
07-30-2006, 10:39 PM #5
If you mic the used piston you will definetly see some collapse on the skirts. There is a thread on pwctoday by Harry that covers this in detail. I have mics in my garage up to 12" I think I have your range covered let me know if you need them to measure.
08-01-2006, 04:38 PM #6Originally Posted by RX951
08-01-2006, 04:43 PM #7Originally Posted by VOODOO
01-26-2008, 07:10 PM #8
so should i run a size smaller?
01-26-2008, 11:59 PM #9
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