2003 rm 85

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rmrider45

Member

Sep 8, 2008

171

0

• Oct 6, 2008

• #1

i am ordering a piston and ring set for my sons bike

the nice thing is that the people we bought the bike from gave as the box with the numbers of the piston that the bike takes. it is a 806M05000 CLEAR:0.0020(0.O51MM)

I HAVE FOUND SOME WITH THIS PART NUMBER AND IT SAYS A 50MM BORE AND the box says 51?

http://www.denniskirk.com/jsp/produ...A0WTISM4VMDK0OWIV0?store=Main&skuId=806M05000
this is the kit

http://www.denniskirk.com/jsp/produ...in&catId=&productId=pPK1209&leafCatId=&mmyId=



correct one ?


any other places i could get that kit ?

 

R

RM85rider123

Member

Oct 28, 2007

681

0

• Oct 7, 2008

• #2

Did you bore it out? My manual says the stock bore is 48mm. Try to put the piston into the bore, and see if it goes in. If it doesn't, then return it. OR, you could bore it out the extra 2mm and use it. The reason it says CLEAR-.051mm, is because of the piston to cylinder wall clearance. The reason behind that, is because the piston expands through heat.

 

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rmrider45

Member

Sep 8, 2008

171

0

• Oct 7, 2008

• Thread starter
• #3

yes it was bored out 20 over from the last owner and he gave me a old piston in the box(with numbers). just wondering why the box says 51mm and most of the kits says 50mm. just making sure



CLEAR:0.0020(0.O51MM)
and the kits says 50 mm bore

http://www.denniskirk.com/jsp/produ...A0WTISM4VMDK0OWIV0?store=Main&skuId=806M05000


http://www.denniskirk.com/jsp/produ...in&catId=&productId=pPK1209&leafCatId=&mmyId=

 

J

JGrossijr

Member

Dec 29, 2004

36

0

• Oct 9, 2008

• #4

The piston is for a 50mm bore and should have .051mm piston to cylinder wall clearance. In other words the piston diameter is 49.949mm