i posted this in general/arctic cat forum but i think that it should be here

hi all,

I'm from Sweden so my english can be a bit "off"

my problem is this.

I start my sled,I let it warm up. It drives off well.
It runs smooth ( and has new cylinder and so on)
after about 1/4 mile it starts to run very bad at high rpm.
2 much fuel. It's like it fouls the spark plugs.
from what i can figure out it can be either the fuel pump or the ignition is out of time or what ever .
is there any one that knows about these problems
that can help me with some ideas what to check first
(cuz there seams to be allot to check)

the sled runs smooth idel and up 2 about 20 m/h

Do you have reed valves in your model or a rotery disk behind the carbourators?

sorry forgot

its a non battery fuleinjection

too much fuel? needle&seats ,flooded crank? wrong plug temp? air in fuel lines,caused by cracks on the ends of your fuel lines (replace) :thumbsup:

ok got
the sled 2 a dealer 2day

sled runs hot and fail safes ---> floods engine whit gas

also strator is not ok (actually broke down at the dealer lool )