Maintenance & Technical > KX500 Original

Mainjet adjuster? Doordie please explain

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demographic:
While looking through the gallery I spotted this....



Also I spotted this picture...


I can't see it that well from the pictures but it looks like you have used O rings to seal your cylinder head, am I right?
and the port in the back of the piston? to lubricate the small end bearings?

Any chance of a port map to show us the location of that?
And a longer explanation cos I am very interested by that and as I now have two engines I have more bits to play with :wink:
What carb modifications have you made?

I can see the bit on the bottom left of this picture (have seen them advertised but can't remember what they are called :? Maybe an Airstriker wing?) but how well do they work?


And I take it that the mainjet adjuster is the part on the bottom right of the picture and it replaces the standard plug from the bottom of the carb?
If so it looks different from the other mainjet adjuster that you have, whats the difference?

Regards Scott

doordie:
Demographic,
Many questions there,but I`ll try to answer them!

1)Main adjusters in different size only,one I have made(the big) and one better made found at internet and copied.
2)Sealed with o-rings is old mods, but works very well IF you want to open head often and check.
3)Piston port it?s good for lubricate small bearings and to COOL pistontop(more power for long straights) and make piston a little bit lighter.(A Wisecopiston and a stock modified pistonpin make a huge different,oops a tuning secret). :shock:
4)Ovalbored Kehin PWK 39mm carburator.(Maybe a Lecron 40-42mm in future).
5)Powerblade (KTM 125/200cc use Kehin PWK 39mm)makes faster gasvelocities at part-throttle=more lowend power. :wink:
6)Sorry, no portmap from me. :twisted:

//doordie

YUNGGUNNAZ:
doordie,you have mail.thks

doordie:
YUNGGUNNAZ,

No received mail,try again! :wink:

//doordie

YUNGGUNNAZ:
sent pm again.thks

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