Maintenance & Technical > KX500 Original

Jetting Question

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Roostmad1:

--- Quote from: Jopiz on August 02, 2010, 11:03:33 AM ---Raising needle clip makes your mixture leaner from 1/4 to 3/4 throttle. Main jet from 3/4 to 1. Pilot jet from no throttle to 1/4.

Belray MC1 is a very "heavy" oil. Its very similiar to motul 800 but known widely for gumming up the whole engine. Racing oils need high flow velocities to leave the engine. Lighter viscosity 2 stroke oils dont. Thick oil covers the crankcase and eventually spark plug which leads to fouling. Stick to ligher viscosity oil and jet correctly.
Don't know where you heard synthetic motual 800 gums up the engine?thats a load of rubbish!!,its the best oil for KX,s mate,i've used it for years at 32:1 on all my KX's and jetted correctly never fouls a plug even when putting around and also keeps the powervalves mint with superior lubrication,try some even smells nice

--- End quote ---

greencannon:
If it runs good, doesn't foul plugs and doesn't smoke badly - dont fix it..... Friar is right you could change jetting constantly and never be completely satisfied... find that happy medium
I used to run super M, if i remember correctly it is very dark oil with a spash of castor in it.  My bike ran great on it other than the dark plugs and spooge at the silencer. I now run
Yamalube R with same performance, lighter color plug and hardly any spooge, same jetting.
Be careful with a 7 plug. They work good for woods riding but I think they are too hot of a plug at wide open throttle.

Big Yac:
I really don't get alot of wide open throttle times, its mostly woods here with the occasional blast across an open field.  I did get a BR7ES.  By the way, whats the difference between the BR8ES and BR8EG?  The G says racing but what else does it mean?

Friar-Tuck:
Everything you wanted to know about Plugs :-D
http://www.ingfatrygg.se/Spark_plug_diagnostics.html
 \o/

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