Maintenance & Technical > KX500 Aluminum Frame Conversion (AFC)
HELP w assembly
81cr450:
Darnit , wish I knew about the 88 jug being able to go to the 91mm before. I like the idea of eliminating that center flapper, as it doesnt seem like you could be gaining much with it & 1 less moving part to wear out , would be great.
I do have a couple more pics but I need to figure out how to do the image hosting thing again.
81cr450:
What is a safe powervalve center flapper to piston clearance? I'm thinking .025 , but I'd rather be safe than sorry.
Found it on wiseco's site
Exhaust Power Valves (2-cycle engines)
When boring cylinders with exhaust power valves, the exhaust power valve must be inspected
to ensure it does not extend into the cylinder. The exhaust power valve must have
approximately .015? clearance from the cylinder bore. Without proper clearance, the
exhaust power valve could contact the piston and engine damage could occur. If
machining the exhaust power valve is necessary, remove metal only in the area that extends
into the cylinder bore. (See illustration A)
81cr450:
How much static compression PSI is pump gas safe ? I have 170 with pretty well stock port timing. & how much will raising the jug .010 help? I have .039 squish clearance if that makes any difference. 5000 ft in elevation & up
Motorrad:
Short answer.....perfect run it..
Long answer..
Stock they dont like pump fuel...
recut on squish ban is a must
what CC is your Head?
static compression ratio?
81cr450:
47cc is what I ended up with, for 550cc's of motor.
4-5 degree squish angle. .039 squish
170 psi static , but I'm thinking you want corrected? Which I havent figured. Port heights are stock, just cleaned up. Thanks for the response, I just dont want to detonate the guts out of the thing.
Just a note I had to fix the squish angle after a couple rides, it hit HARD & tacked up quick but hit a wall up top. The constant 4 degree squish was over accellerating the combustibles. You need the 4-5* angle just for the first 4mm from the outside then the angle changes to 14-15* into the dome pocket.
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