09-17-2007, 07:35 PM #1
How bad to use A size piston is B cylinder?
could I use a A size pro x piston in a B cylinder? How bad would it be??? 2001 GP1200R.
09-17-2007, 07:38 PM #2
What number is on the cylinder?
09-17-2007, 07:41 PM #3
09-17-2007, 07:43 PM #4
I believe either 7 or 8 I just ask because some kits dont even do different sizes.
09-17-2007, 07:53 PM #5
If it's a stock cyl, it doesn't matter unless your looking for the absolute most you can get out of you motor. The size differences are in microns, it won't matter - did it on my 1200R and still runs like a top.
Call Island Racing or Group K, they'll confirm this (they told me that bit of info in the first place).
09-17-2007, 07:58 PM #6
09-17-2007, 08:02 PM #7
my number 1 and 3 have 1 size smaller pistons than what the cylinder stamping calls for been running like this for 4+ years.
The difference is so small.
I am not recommending it, but letting you know it has not hurt my engine at all.
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
09-17-2007, 08:04 PM #8
another question can I reuse the cylinder base gasket and exhaust manifold gasket they have about 45 minutes on them I am hoping when I go to take them off they come off easy and can just reuse them. Anyone do this?
09-17-2007, 08:11 PM #9
09-17-2007, 08:11 PM #10
exhaust manifold gaskets I haev reused. But base gaskets IMHO are too risky to reuse. I would use a new base gasket. You don't want to chance any leaks.
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