2001 Arctic Cat 4x4 - Running Lean

[drschwinn]

Need some advice... The exhaust coming out of the engine glows red hot when running for a few minutes. I have been told it is running too lean. How do I fix this? is there an adjustment on the carb? if so, where is it located? Thanks!

[oxidized_black]

here's a link for a manual that covers everything in 2001 for the Cats ...

https://www.yousendit.com/download/UW13clVJeDNrWTg5WThUQw

[oxidized_black]

it's a huge file, 197 Mb's. might take 10-15 mins to dload ....

[drschwinn]

Thanks for the help. I just had a look, and I cant figure out if the fuel air mixture can be adjusted without taking the carb apart. Does anyone know by chance?

[oxidized_black]

pm swampcat07 or he'll be on later and comment on anything arctic cat ...

[Whip]

Need some advice... The exhaust coming out of the engine glows red hot when running for a few minutes. I have been told it is running too lean. How do I fix this? is there an adjustment on the carb? if so, where is it located? Thanks!

If if an engine is running to lean the exhaust should not glow red hot! Sounds to me like something is restricting your exhaust for example: nest from dirt dobbers, rats, squirrels and other little critters can cause this. This same thing will occur on many vehicles with catalytic converter/s installed that become clogged over time. Hope This Helps, Whip

[drschwinn]

hmmmm...ok, interesting. So what do I do then? Pull exhaust off? Is that tough to do?

[oxidized_black]

probably 3 bolts starting near the seat. one will be a clamp to the straight pipe and then the other bolts would be to hold it to the frame. i would just take the muffler off and run it to see if that makes a difference. i have heard of running a garden hose thru the muffler to rid mud mud etc. ...

[drschwinn]

ok great, I will try that. Stupid question tho... wouldn't you be able to tell if it is plugged simply by checking the end of the pipe while it is running (without taking anything off)? Or can it be restricted just a little, causing it to glow red hot???

[oxidized_black]

my buddy had a 750 brute that was plugged and had the motor rebuilt from kawasaki and they didn't know, so, it's an easy check really, just a few curse words getting that bolt under the seat by the fender LOL

you'll get some pressure coming out, but maybe not all that it should be ... and if it still glows when the muffler is off, get a wire coat hanger and straighten it out and shove it down the straight pipe, but put a peice of tape on the hanger so you don't go too far in ... measure it a couple inches up from the bend into the cylinder

[drschwinn]

Ok great! Thanks so much! This board has been so much help! I will try that first thing in the morning.

[quadnut20]

ok great, I will try that. Stupid question tho... wouldn't you be able to tell if it is plugged simply by checking the end of the pipe while it is running (without taking anything off)? Or can it be restricted just a little, causing it to glow red hot???

Sounds like ur running lean Bigger Jet will help !! If you got a spark arrester I dought anything is in ur exhaust unless it ate the screen !!

[swampcat07]

I would check first for air leaks or torn boots before the carb or airbox. Is the lid on your airbox?

Did you snorkel the quad or replace/modify the muffler?

Also how cold is it there. If it was running fine before lets start threre.

[drschwinn]

No modifications to exhaust at all . Just below freezing here.

[swampcat07]

How was it running in the summer? I know the cold weather leans it out but not that much.

[marco01]

Hi i have a problem with my 2001 arctic cat 300 4x4 before we heard the ATV was backfiring and we saw a hole in the air intake boot so we replaced it  but still backfiring we think its running rich but we cant figure out where the screw is to chage that can anyone help