Main Jet size with full exhaust

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#21

03-14-2011, 07:07 PM

407guy

Senior Member

1st Gear Member

Join Date: Jan 2011

Posts: 186

Quote:

Originally Posted by dan888

LOL.

FWIW, I have the TBR M7 exhaust (stock header) and this is what TBR recommended to me:

With the air box snorkel removed using the TBR exhaust:

Dyno Jet needle in the 3rd position
Stock 35 pilot jet
Dyno jet 128 main Jet
Fuel mixture screw 3 turns out

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#22

03-15-2011, 12:57 AM

TNC

Senior Member

1st Gear Member

Join Date: Sep 2009

Location: Abilene, TX

Posts: 5,050

Quote:

Originally Posted by IDRIDR

TNC - aren't you still running the stock #35 pilot jet? I bumped to a #38 and it's too rich, even with Kouba screw only a little over 1 turn out. So I'll be going back to the #35, leaving the #128 main and DJ with clip in 3rd from top (middle position) and see if that helps. Mileage is sucking at 48 mpg on the flat and easy. Air box lid off, HMF slipon, stock header, twinair filter, 3,000 feet above sea and up.

IDRIDR, I'm sorry I didn't notice your question until now. Yes, I'm running the 35 pilot. I installed the 38 when I installed the 300 jug, and it was definitely too rich. I'm not BS'ing about how crisp and smooth my jetting is, and my mileage is very satisfactory, as I've reported several times already. That said, it's odd but true that all KLX's...or any other motorcycle brand/type...will not respond in an absolutely exact manner from bike to bike...with jetting or other mods...but most of them should be in the ball park.