Motorcycle Repair: 1999 Honda 400ex Carb, honda 400ex, altitude difference

Question
Hey Mark,

I moved to different state and my Quad wont stay running i would imagine that the altitude difference would be the problem, i don't know how to adjust it to keep it running. When i start it the only way it will stay running is if i keep my hand on the throttle and it backfires when i try to keep it close to idle.

your help is greatly appreciated.

Thanks,
Travis

Answer
Hi Travis,

Altitude affects air-fuel mixtures in the carburetor. Simple tuning can correct the problem.

I return tech information files by email. There was no email address with your question as requested and explained in my instructions.

Reply with the following and we'll pick it up from there:

1) email addy
2) elevation/altitude
3) average temperature
4) current jets sizes
5) type of air filter and exhaust

Respectfully,
Mark Shively