Motorcycle Repair: JETTING CARB.., honda crf 50, elevation above sea level

Question
yes, I'm having trouble rejetting my 05 honda crf 50.. I have a BBR exhaust on it,a 88CC big bore kit on it with a 20mm carb,k/n air filter..I've tried moving the needle and ect ect.. it still bogs out really bad when I hit the gas.. I have a 90 main jet in it and 2 turns out on the air screw..thanks for any info..joe..

Answer
Hi Joseph,

Can you describe the appearance of the spark plug to me?

If you provide me with the following information, I can do the math and figure the corrected jetting.

1/The elevation above sea level of your riding/living environment.

2/Average air temperature of the environment.

3/Current sizes main & pilot jets. (I have the main jet size).

There was no email address as requested. I return tech information files email.

Respectfully,
Mark Shively