Maintenance & Technical > KX500 Original
Exhaust valve timing..?
John:
If you alread have it apart, could you count the coggs on the different gears involved to be able to calculate the total ratio agains the crank revolutions. I assume it's not 1:1
Be careful so that you don't modify too much. One of these balls went through the engine cover on my 125, it did a nice big hole. That was due to wear / exhaustion rather than modification. Expensive anyway!
Cheers!
//John
YUNGGUNNAZ:
ok.will do that tomorrow.good point.won't grind on it too much.will make sure at full extension that the balls cannot come out.will also mike them for size as with lockup clutches, gram weight makes a difference with spinning mass.
YUNGGUNNAZ:
here is somespec's on 99 k5 governor : balls-7.9mm(.311)WASHERS-1.02MM(.040),same thickness as trans washers.spring hgt. uncompressed-25mm(.985)coil dia.2.04mm(.080).plastic gear was 18 teeth and 13 on the crank.looking for my angle finder so i can maybe get the degree of angle of the ramp.anyone know whether there are optional ramps available to the public.heard some factory sponsored bikes try different ones.
John:
Nice work!
This would mean that for every crank revolution the small axle will rotate 13/18 of a revolution. So if 6000 crank RPM's is the theoretical opening time for the govenor, it would calculate out as 6000 x (13 / 18) = 4333 RPM's on the small axle.
Does anyone know what the specified opening times (RPM's) are supposed to be for the exhaust valves?
Does anyone know what the ideal opening times (RPM's) should be for the exhaust valves?
Could anyone make a general statement of how the exhaust valve opening times affects the general behaviour of the engine?
I assume fiddling with the timing would require a different jetting - needle anyway.
//John
doordie:
Harder spring in KX250. :wink:
(Nearly the same maximum rpm for kx250 and kx500).
I have a kx250 spring for testing later in winter. :twisted:
//doordie
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