Tried the obvious still only goes 50 no power *solved*

[JP7272]

I have new gas, overrode TORS, replacaed plugs, tried the obvious. Sounds like its miss firing when its warmed up at low rpm. Please help

 

[yamahas]

at what rpms does it start missing? what year? The more info the better.

 

[JP7272]

It seams to do it intermitantly it does only after it gets warmed up high rpm low rpm comes in and out its an 07 fx it will only run 8700 rpm wide open and seems to be very boggy at half throttle

 

[yamahas]

what does it idle at when warm?

 

[JP7272]

1400

 

[JP7272]

any help would be great thanks i will check tomorrow

 

[yamahas]

thats way too low, should be around 1750. up at the front behind your left a arms there should be a rubber cap. take it out and warm the sled up. should be a phillips screw in there that you tighten and the rpms will go up.

could be a good place to start.

 

[JP7272]

I'm not second guessing you but why would that affect the top end

 

[yamahas]

it could explain the missing down low.

i think this adjustment changes the sctual lengh of the throttle cable because of the way its written in the manual imo. so it could be that you cantget the throttle opend all the way?? might be far fetched but i would give it a try, if it fiexes the missfires on the low rpm's then you only have a problem with the higher rpms.

either way it should be higher so it would be good to adjust it.

 

[Voda2000]

I would check to see if the throttle bodies are still attached to the block. They can pull off the rubber boots if someone tried to remove the air box without getting all the screws out that hold the air box to the throttle bodies.

This would seriously lean out your sled.

 

[cannondale27]

How did the plugs look when you took them out?We need to try figuring out if this is a fuel or electrical issue.

 

[RoicIND]

Just a thought, but also check the exhaust for obstructions.

If the sled stored and it's doing this for the first time this year, I'm gonna go out on a limb and say something fuzzy's been living in the exhaust...

When running, what kind of exhaust pressure is there?

 

[3wheelerdude]

Just a thought, but also check the exhaust for obstructions.

If the sled stored and it's doing this for the first time this year, I'm gonna go out on a limb and say something fuzzy's been living in the exhaust...

When running, what kind of exhaust pressure is there?

If you dont find anything furry in the exhaust , then check the airbox, as they love to crawl in there too.

 

[LEE337]

^^ Yep found a nice nest in mine when i tore it apart to get it ready for the season. Little buggers

 

[RoicIND]

FMF makes a great exhaust plug to prevent this sort of thing.

I have a couple extra for the bikes that I throw in the exhaust when not in use......