Maintenance & Technical > KX500 Original

Timing Question?

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gowen:
I've installed a PVL ignition, which is a little inner rotating flywheel and is a whole new ignition and I have a question about setting the timing, maybe Cam or Doordie or anybody!! can help.

PVL recommends the ignition setting to be set at 2.2mm-2.4mm before top dead center. Well, I used a dial indicator and set the mark at 2.3mm (.090in). It is a little harder to start, but has good revs and get this! The vibes are waaaaaay down!!!!!!! Anyway, for my question, they say in the manual that modified engines need to be retarded from the above figures. Now, is retarding the ignition going from a 2.3mm to 2.4mm or the other way? Also, does anybody have any clue as to how much I should retard? I'm very lost in this process and just plan to just play with it, but should I start by retarding the timing or advancing it? I favor the topend.

Thanks

Paul:
getting closer to TDC retards the timing. So 2.3 -> 2.2

doordie:
gowen,

Paul is right!
I will check up what timing you should use.
Don?t overadvance it ,you can ruin the engine!
The teory is so low advance as possibly. :wink:

//doordie

gowen:
Doordie, that would be awesome if you could do that! Thanks! Penton Imports told me the exact opposite. They also said, that all the modifications I will need to further advance it. Is this true? Or retard it? I remember on the stock ignition that I retarted the timing to bring up the top-end. Thanks doordie

Gabe

doordie:
gowen,

Alt 1:
A=Cos(P2+R2-L2)/2*P*R

A=ignition advance in degrees
R=Stroke divided by 2 in (mm)
L=conrod length (mm)
P=R+L-T

Alt 2:
T=ignition timing in (mm)

T=L+R*(I-Cos A)- "ROT"(don?t know word) L2-(R*Sin A)2

This is the formulas!

At 5000 rpm stock timing is about 17 degrees ,then fall back to XX degrees to it reach max rpm.(Don?t know what KX500-CDI have for set-up programed).

I will not say what you should use for timing,will not be responsbility! :oops:
Start at low advance and step up in 0,1mm and run it and check
if it runs better.Then when you have reach the best performance,fall back a little and see if you loss Hp.
My advice is to use the least of amount of advance conducive to peak performance.

Good luck! :twisted:

//doordie

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