Maintenance & Technical > KX500 Original
CR500 rod and Piston in KX500
doordie:
Use 144mm H...da rod,and you don?t need to "shave off" barell so much,only 1mm difference between KX500 (145)and CR500(144). :wink:
I think you have to resleeve if you go bigger than 90mm in bore :|
The cylinder walls will be thin and maybe crack if you only replate :?
I think we have a few bigbores guys out there,help him out please! :-D
hillclimber147:
When extra base gaskets are added to raise port heights, how much are you guys raising the cylinder by? This mod shifts the power band up in the rpm range correct?
stroke.n.smoke:
Can you not just raise the transfers instead of lifting the whole cylinder up. The exhaust port hieght goes up as well, I think that is why the powerband increases to the upper rpm limit. What about widening the transfers and exhaust port and leaving the cylinder where it is at. I think widening the exhaust port gives a (wide) increase in the powerband. Increasing the torque as well. I would send the cylinder out to someone who knows the 500's ports and let them massage it to where it makes the most power all through the rpm. Speaking of that, is there someone on here that knows where to send the 500's cylinder out for the best porting???
hillclimber147:
I just got done crunching some numbers with the information Wiseco gave me about pin to timing edge height for a CR and KX piston. With a 139mm CR rod, the rod and piston combo is 3.2648mm shorter from crank center to piston timing edge. With the 144mm CR rod the combo is 1.7352mm longer.
My question is if I go with the shorter combo how much can be shaved off of the cylinder base, and how much can the cylinder be "raised" before port timing is out of wack.
If I go with the longer CR rod I would have to have a cylinder spacer of at least 1.7352mm thick to compensate. Which way would you guys go?
kx666:
hmmm... doesnt kawi make a +1 head gasket....then just find a +.7352 base gasket or makew a spacer???>
i am going to keep an eye out for a 144mm rod for s&g's
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