I want to rebuild my 2001 RM 125's top end. I have OEM piston and I think I have all I need and now... a man at our local track said I need to "Hone" the cylinder so the rings seat. He said the run the hone tool up and down 3-4 times to "rough" up the cylinder wall. He does this with his son's 60.
If you have done rebuilds please let me know about this. Thanks.
I just found out that the piston that came with my Suzuki top end kit has a flat top and is lighter than the one that is in the bike now. Is this a problem? When I did a search by part number this flat top piston comes up. However, my book (that come with the bike) calls for a different part number.
February 2001 saw the introduction of a completely revised 125 and 250 for Suzuki.
Both bikes have entirely new frames with redesigned suspension along with Showa suspension components.
The engine on the 125 was also completely new, (now displacing 124.8cc with a bore of 54mm and a stroke of 54.5mm). The engine is roughly 2 pounds lighter and 21mm shorter than the previos model, and features a new 38mm Mikuni carburetor, revised intake tract, head and piston, exhaust port timing and exhaust pipe.
The new RM125 is claimed by Suzuki to be substantially more powerful than the previos model.
It seems you have one of the earlier models (which to all intents and purposes is a 2000 model!)
I don't know whether you can use it, but I would doubt it Can you not exchange it?
Also ... Is your old piston in fact @#$% - ed?
If not ... a cheaper alternative may be to get new rings for your old piston, (honing and cleaning the bore / barrel lightly before assembling), and seeing where that takes you? and yes, you should order parts as tho' it is a 2000 model