Maintenance & Technical > KX500 Steel Frame Conversion (SFC)
2003 KX 250 SF Conversion
dave916:
These motors are never ending when you start doing work to them :-D
As u are gone so far i would check for side movement on the complete crank
I reckon 50% of kx500 have either worn crank journals or main case races
A steel set of valves is what u need {think the 86 had them}
A modded Steel set with a 4mm spacer {nut} loctite to the kiips shaft{see black arrow}
dave916:
If your kipps valves were not fitted to cylinder i presume the kipps chamber would be opened all the time which kill top end
Bottom end would also be affect as the exhaust sub port would also be opened
Hopefull the valves fitted would have big gain bottom to top
Only down side it may be a bit harder to kick
umberto:
Luckily, there was no side to side either. All in all it seems to be a very solid motor.
I wasn't that impressed with the 88 KIPS valves, they seem to be made of some pretty cheap metal. I wasn't able to locate any 86 valves. Do you know if the later model valves will work?
dave916:
--- Quote from: umberto on August 12, 2015, 02:32:26 PM ---Luckily, there was no side to side either. All in all it seems to be a very solid motor.
I wasn't that impressed with the 88 KIPS valves, they seem to be made of some pretty cheap metal. I wasn't able to locate any 86 valves. Do you know if the later model valves will work?
--- End quote ---
All the KIPPS valve 86/88 will interchange/ alloy and steel {
IF You had a steel set i think the should last for ever
The steel one have a narrower stem than the alloy ones
umberto:
I pulled the cylinder off my bike last weekend, and was going to install the exhaust valves from the 88 head I bought on eBay. I stopped because I wanted to see if a buddy of mine could make new ones out of steel. While the cylinder was sitting on my work bench, I noticed that the exhaust ports that tie to the KIPS ports are very different from the 88 head I bought, and the one that came on my bike.
Here is the 88 head from eBay:
Here is the head from my motor:
Does anyone know why the exhaust ports would be so different? Maybe the head was sleeved with a later model sleeve? I'm not that familiar with the K5 heads, and was hoping someone could help me figure it out. Thank you!
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