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03 LTZ 400 jetting question.

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James,

03 LTZ 400 with.... 435 JE 12.5:1, TC head + cams, 39 FCR, HMF FULL exhaust, Alba black box (1000rpm over), Pro Design with Uni filter with no lid or snorkel....

Carb bought from Sparks racing, pre-jetted..... 55 Pilot 165 Main 4th clip on WR needle ( I think its the WR needle ) 1.5 turns on mixture screw on Sunoco 110 race fuel... Running CR8e plug at sea level....

been from 155 to 195 plug shows no changes at all, color wise.... barking/popping on top........ seems to run well everywhere else... from some research done, it seems that most dudes are running in the 42-52 range on the pilot and 165 to 190 on the main........

just doesnt seem right..

Suggestions??????

Joe

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What is the needle code used in the carburetor?

Is this FCR an older or newer style? (The pilot jets are different)

The new style has a pilot jet like a 2-stroke Keihin PWK or PJ carb.

The pilot jet would depend on the needle-- #45-#50

Main jet in the range of #170-190 depending on needle again.

James

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Not trying to jack a thread . My friend has a stock 2005 LTZ with the new klien carb . What is the correct jetting for this . Its all stock except for a full yosh exhaust . Thanks for the help :naughty:

Rob

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