Maintenance & Technical > KX500 Steel Frame Conversion (SFC)
2003 KX 250 SF Conversion
umberto:
I never thought about wider, but always felt like my 07 was just longer than my 03s and my 04. I may be wrong, but it sure looked and felt like it was. You're absolutely right about the handling. My 04 would turn circles around my 07.
zz3gmc:
Ive fiddled with my 07 and have come to terms with its handling. I like it a lot in tight, technical terrain (does great pivot turns) but when riding in more open terrain I just dont trust the front end. Likes to knife and wash at times. There is a fix on here that involves changing the steering head angle by cutting and rewelding it. I have thought about doing it in the future. Im still faster on the 500 hybrid! It handles great!
umberto:
I measured the 1988 head that I got off eBay, and the bore is 88 mm. The head that came with the motor is 86 mm, so if I want to use the eBay head I will obviously need a new piston (Wossner makes one). The engine displacement calculator I found online said this combo would give me 523 cc. Do you guys think I should go that route (my life insurance is paid up), or should I try to find an 86 mm bore 1988 head on eBay? I think the sleeve on the eBay head is okay, but I don't have that much experience with non-coated cylinders. Is there anywhere I can send the cylinder to that can evaluate it? Thank you for the advice!
dave916:
--- Quote from: umberto on August 16, 2015, 01:27:34 PM ---I measured the 1988 head that I got off eBay, and the bore is 88 mm. The head that came with the motor is 86 mm, so if I want to use the eBay head I will obviously need a new piston (Wossner makes one). The engine displacement calculator I found online said this combo would give me 523 cc. Do you guys think I should go that route (my life insurance is paid up), or should I try to find an 86 mm bore 1988 head on eBay? I think the sleeve on the eBay head is okay, but I don't have that much experience with non-coated cylinders. Is there anywhere I can send the cylinder to that can evaluate it? Thank you for the advice!
--- End quote ---
I would u the ebay cylinder {if there is wear u would feel with your nail on Exhaust side /3mm below TDC where the rings stop
May be better to use a 88mm head gasket as well
The old wiseco with the cut out at the side are the lightest piston u can get
not sure if this is a old one are not but pretty cheap
http://www.ebay.com/itm/WISECO-PISTON-BIG-BORE-KIT-1988-2004-KX-500-88MM-/271802068221?hash=item3f48aa6cfd&vxp=mtr
umberto:
The cylinder has some light marking, but no grooves at all. I think I should be okay. I am going to try a Wossner piston, Foxx and Sandblaster seem to really like them.
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