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450high

pilot air jet recommendations

4 posts in this topic

03 wr450.I'm presently running 168 main,40 leak , 48 pilot , 70 starter & a 80 pilot air jet.Does any one have a better pilot air jet size to try and how does this jet affect the running.

Many thanks dave.

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What works for someone else wont always work for you.

Humidity,temperature, altitude, exhaust system etc etc will all make a difference to how it runs.

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You can try a 120 PAJ. It tends to allow the pilot to flow more fuel in on larger pilot jets. I run the 70 PAJ with my 48 pilot. NCMountainman runs the 120 PAJ with his 50 or 48 pilot jets. The difference is subtle. :)

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I run a 100 PAJ with my 48 pilot. Very happy with it. :) If the original jetting Q's post is still out there somewhere, one of the pioneers of jetting research on this site had made a post of the relationship of PAJ to PJ and how they afffect the pilot circuit. Basically a bigger PJ requires the correct PAJ to flow the proper amount of fuel. I have tried running the 100 PAJ with smaller PJ's and it is noticable that with a 100 PAJ/45 PJ combo is a little lean for my conditions while a 80/45 combo works well but doesn't offer the same torque off the bottom as the 100/48 combo.

-Lowedog

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