Maintenance & Technical > KX500 Original

Timing Question?

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doordie:
gowen,

Ask any preowner of old (before1984)Husky 488cr with motoplat rotor-ignitionsystem.Many broken wrists :lol:  :lol:  :lol:

Yes, that?s a problem you have to live with. :cry:

Many vintagebikers here start the bike with pulling first, so it?s more easy
to start it when warm close to race.

Little "inertiaweight" reduce the helping rotating force with a rotor.
(I have reduce the stock flywheel weight only,good for revving on iceroadracing but spinns the backwheel more easy though). :wink:

//doordie

gowen:
Well, just a small update on the timing. I did reduce the kick backs by retarding the timing. It's been fun, but now I'm running into another problem, it is a pain to start! I just replaced my kickstarter last year and now it is bent a little outward and it is now slipping slightly from the kick backs. When I get it started and it is HOT it is still hard to start, just as hard as cold. There is no way anybody could live with this bad starting on the KX. I will reinstall the stock ignition if that is the case. But, I will try to advance it tomarrow and see if that helps. Was wearing my riding boots (AXO RC5) and now have a huge bruise on the bottom of my foot from kicking. A little discusting. :-( Cam, a degree wheel would be awesome! my e-mail is gabeowen@earthlink.net

I'm also thinking I should go with a EIX plug instead of a ES plug. I will try tomarrow if my lower foot doesn't hurt as bad as it does now. :-) Any thoughts?

doordie:
gowen,

Here is some calculating:

2.4mm=16.9*
2.3mm=16.5*
2.2mm=16.2*

Stock is not 17* at 5000rpm it?s at 6000 rpm! :oops:

Some info about more or less advance:

If you want fast big "hit" in low and midrange adjust for more advance,but it will be more heat and easier to sieze at long straights.
The opposite with less advance with more topend and more "space" to siezing.

So, more advance with many sharp corners,and the opposite with long straights!

Just my idea. :wink:
 
(We have a good tuner from Finland as member,he will correct me if
I have wrong ideas). :lol:

// doordie who?s waitng for ice. :twisted:

mun:
I guess Doordie mean me :oops:. Eric Gorr is good tuner, not me, but i agree what  Doordie said about advance.

Maybe this can help you too:
If diameter of flywheel is 80mm, so circle is 80mm x pi(3,14..) = 251,3mm.
251,3mm / 360degrees = 0,698deg/1mm = 1mm in the circle is 0,688deg.
So 2,4mm in the circle is: 2,4mm * 0,698deg/1mm  = 1,6755mm.

I like write and ask more here, but my english, d**n :(

doordie:
mun,
Don?t worry,they understand my bad spelling so it?s no problem for you,I promise! :D
Everyone look at his website,and you understand mun can "a lot" of tuning. :wink:

//doordie

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