Maintenance & Technical > KX500 Original
kx500 outlaw kart motor
sandblaster:
Port timing
Compression
Skipping 85---
86 had the highest port timing and compression.
89-04 was next best
87 was next best
89-04 was next best
88 was the worst
86-88 are the easiest to port and can all be made to scream.
89-04 can also be made to scream but it takes a bit more effort.
With my new valve design I'm hoping to make some significant improvements on the 89-04 but time and dyno testing will need to be done.
Mechanically I have it operational... Took me three attempts (welding and hand machining) to get what I wanted.
I'm sending my cylinder away next week to get it bored and machined..
I'm also sending in my crank to get it rebuilt.
So I should have something to test in about a month or so...
I hate sending my cylinder off to the competition because they will see what I am doing :-(
But they will only get half the story without the valves :-D
I won't say who it is going to either cause I really like the guy but we don't share everything :evil:
dave916:
86/ 88 had all almost similiar port timing {120/180duration}
only real differance was main exhaust port on 86 is far smaller
Dont know where clmer got those specs
sandblaster:
Hmmm... I did not know that.
I'll have to pull the 88 cylinder off the wall and do some measurements...
Do you have the exhaust port height and width for the 86?
umberto:
--- Quote from: sandblaster on June 16, 2018, 02:41:27 AM ---I'll have to pull the 88 cylinder off the wall and do some measurements...
--- End quote ---
Sorry to hijack a thread, but did you ever get an 88 cylinder head in? I'm still looking for one...
funkj:
Am I safe to assume the 86 cylinder is a 3 port exhaust with 2 drum valves and no main port flipper?
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