just came back from riding this 4th up in the mountains at about4 to 5000 feet. my fan seemed to run alot and when iwould let of gas when it start idle down it would start small poping out tailpipe thougt it might be lean, but all i have done is hmf slipon & knfilter 5 univents in air box 145 front148 rear. or could it be rich causing the poping and the fan running cause it was hot outside&was riding pretty hard ??????? oh ya 04 v700..??

 

It's running lean. Definatly.

 

hey thanks, now wondering what 2 do shimneedles rejet its hard 2 do plug test where i live ,, but it was fast my uncle has a grizzley i think 02, but i walked away any time wanted tryed 2 get top speed but couldn't keep up.

 

I thought higher elev. made you run rich do to thinner air?

 

thats what i thought as well,but what else exsplans the fan running alot, popping on decell

 

???????????????????...Did you check the plug?

 

Check the plug just to see waht color it is. Then we can help you out more once we know that.

 

backfireing out the carbs is lean......out the pipe is rich...........but check your plugs.

 

Popping or backfireing on decell, is a lean idle circuit, and it will be in the exhaust.
The reason it runs hot, is because running at altitude cuts the horsepower, and you need alot more throttle, to get the same proformance at sea level.
Going up in altitude will definetly make it richer, but its possible to be too rich on main jet, and too lean on mixture screw and/ or pilot jet.