1990 RM80 Pistons

Started by chubbyEXboy300, April 05, 2006, 11:23:21 PM

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chubbyEXboy300

April 05, 2006, 11:23:21 PM
I need a .20+ piston for a 1990 Rm 80 that has been .20+ bored over. I think i should buy the .25+mm piston (wiseco) but im just not sure. Another site said .50+mm piston. I really need some help with this before i buy and install a new piston.
-2005 Trx300EX
-20"razr
-21" protrack
-HMF Exaust dg Header
-Sunstar 14 tooth front sprocket
-MSR /handle bars
-Gdc Oil cooler
-250r custom hood scoop
-Cut plastics
-All balls Bearings
-EBC brakes
-Shock covers
-Monster energy drink bar pad,
-ITP rims,
-K&n air filter
-Dyno jet kit

chubbyEXboy300

#1
April 05, 2006, 11:25:28 PM
if any of u tech guys need some specs to figure my problem out i have the Service manual so just reply to the thread. Thanx
-2005 Trx300EX
-20"razr
-21" protrack
-HMF Exaust dg Header
-Sunstar 14 tooth front sprocket
-MSR /handle bars
-Gdc Oil cooler
-250r custom hood scoop
-Cut plastics
-All balls Bearings
-EBC brakes
-Shock covers
-Monster energy drink bar pad,
-ITP rims,
-K&n air filter
-Dyno jet kit

Mrs.Nightbreed

#2
April 06, 2006, 01:30:46 AM
STD bore for that bike is 47.50mm. If it has been bored over once already then the piston that is in it should be 47.75mm. Then you would want the 2nd over, which is +.50mm Wiseco part # 579M04800, which is a 48.00mm piston. But you will have to have it bored. You can't just drop it in.

Check this out:
http://www.wiseco.com/PDFs/Catalogs/CB06/SuzukiCycleDirt.pdf
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