06 rev 800 missing

[SaskSummit]

My boys 800 seems to miss sometimes at wide open throttle. It will then go away. Doesnt do it all the time any ideas?

 

[nielsy]

check your rpm's maybe you are running it to the revlimit

 

[ForeverRMK!]

Might have ice in the carb sucking over the main jet, check the bowls for water and or dirt in them.. A little gas line antifreeze might help it out too.. Just triing to help!!

 

[SaskSummit]

None of the of above but thanks anyone else?

 

[rusty]

ok... what is your tra setting at?
what fuel are you putting in it,
has the sled been regeared or rejetted
is there any holes in the intake boots
is the dpm grounded properly
does it start good when it is warm
have someone recreate the syndrome safetly and as soon as it starts to miss shut it off and stop it as fast as you can.. pull plugs and check piston wash and plug color
i think you are running a high ethanol blended fuel and at higher rpms it is detonating because of preignition.
or it is indeed the engine hitting the rev limiter
or there is a place on the sled that a air leak is affecting the sled
this is very dangerous .. be very careful. this may burn engine down.

 

[rusty]

Also i checked your profile and it says some engine work has been done, have the jets been changed to match porting??

 

[DRD]

Does it actually misfire or surge and make a (wah, wah, wah) sound?

 

[whitegold]

It might be as simple as loose boots on the spart plugs.... or a loose wire leading to the boot. The plugs are in tight enough to ground out properly?

 

[Taminator]

It might be as simple as loose boots on the spart plugs.... or a loose wire leading to the boot. The plugs are in tight enough to ground out properly?

Ya what she said...also clean out the carbon build up in the spark plug boot, it seems to build up in there very fast and can cause a problem.

 

[SaskSummit]

ok... what is your tra setting at?
what fuel are you putting in it,
has the sled been regeared or rejetted
is there any holes in the intake boots
is the dpm grounded properly
does it start good when it is warm
have someone recreate the syndrome safetly and as soon as it starts to miss shut it off and stop it as fast as you can.. pull plugs and check piston wash and plug color
i think you are running a high ethanol blended fuel and at higher rpms it is detonating because of preignition.
or it is indeed the engine hitting the rev limiter
or there is a place on the sled that a air leak is affecting the sled
this is very dangerous .. be very careful. this may burn engine down.

the tra is set at 3 we were having trouble getting rpm out of it before
i always run premium and make sure there is no ethonol
it is jetted proporly i called slp
i put different boots on it when i did the engine the old ones where coming apart
not sure on the dpm
yes starts good warm
i will check the wash and plugs.
thanks for te info

 

[SaskSummit]

i will check the plugs and wires it seems to be a spark issue to me because it doesnt do it all the time.

 

[davelaw1982]

My 07 would miss/stutter at times recently. I had installed a prefilter on the air box intake above the clutch guard to keep out belt dust, but this messed with DPM. Gave it false pressure differential because it would suck the prefilter in, and with the hose going to the air box on the left door, cause it to be to rich, and misfire. Pulled off prefilter, and walla, things were all good. Check all DPM hoses for cracks, ice, other crap in them. It may not be correctly compensating, and over/under fueling. Make sure your DPM is working, a momentary rich fuel system could cause this. Does it stutter if you are giving it throttle near wide open and then let off and back on?

What about clutches, you may not be over reving, but when was clutch cleaned, inspected for wear? If you have a bad ramp, with a small ridge in only one, or a sticky roller, flattened roller, bad bushing, something that won't allow it to shift properly, could seem like a misfire/stutter.

 

[SaskSummit]

ok still doing it. i am going to get a new key tomorrow because there is a little peice missing on this one. I just don't know what else it could be.