Maintenance & Technical > KX500 Original
CR500 rod and Piston in KX500
Johnniespeed:
Hillclimber147, Could a 90mm piston ( CR) be special ordered with the piston pin hole machined in the KX location ? Or could you purcahse the unmachined piston forging and you machine the pin hole to KX diameter and location. That would allow your 90mm bore,rod would be unchanged and port timing would not be changed. Using a shorter rod increases the thrust angle and places more thrust on the cylinder wall, not good.. And moving the barrel upwards, increases the crankcase volume which is not good in theory. I see no gain in using the CR rod except that it would fit onto the CR piston.
Since we are only talking here, I thought that moving the pin hole was easier than changing the rod and fussing with barrel height. John
hillclimber147:
I haven't been able to find anyone who does custom pistons. And from the last I heard you had to order a large number of them.
Paul:
Any piston manufacturer will machine you any piston you want. I have a set of 4.040" SBF Ford pistons that use a Chrysler rod, Chevy rings, a 4.15" stroke and have a "39cc" dish in the top to achieve 8.8:1 CR for my FI engine. While expensive, it isn't impossible to get what you want / need. As far as I was told (by JE) these are the only pistons of these deminsions they have ever made.
Paul:
--- Quote from: hillclimber147 on January 04, 2007, 08:58:24 AM ---I haven't been able to find anyone who does custom pistons. And from the last I heard you had to order a large number of them.
--- End quote ---
This may very well be the case for a single piston.
hillclimber147:
I just talked to Wiseco and they can make any size KX 500 piston I want. A run of four, 92mm pistons(with rings, circlips, and wrist pin) would cost $252 a piece, a run of 8 would cost $208 per piston. The price per piston is what I would expect for a custom piston it's the number I would have to buy thats painful. Anyone interested in a 571cc KX? LA Sleeve's big bore KX 540 sleeve has a 95mm OD, which is plenty big to house a 92mm piston.
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