hard warm idle stalls

[jocelyn gauthier]

Hi everyone how are you my name is Jocelyn im new and i speak french so i will do my best to be understood.

I have a 2006 apex gt

Cold start is very good
Then when it begin to be warmer the rpm decrease to 1500 (good)

As it heats up more and i give gas (below 3500 to not engage the clutches).. It will drop down to 700-900 rpm and run very rough and stalls.

I put key off.. Hold a bit of throttle and starts fine again.. But will stalls again.. Always when hot only.. Even in the garage

My battery is good
I put new spark plugs
Sled has 21 000 km

My tps values in the speedo are 19-96

My CO's are all -10.

Would i need a valve job ? Valves wont seat properly when they are hot and expand ?

Thanks a lot

 

[tomanytoyz]

Hello welcome.are you the original owner?

 

[jocelyn gauthier]

Hello welcome.are you the original owner?

No. Im not. Im the third

The guy i purchased from changed the pickup coil 2 years ago thats it.. Has not run since..

Fresh gas in ..

 

[tomanytoyz]

Hmmmm 2yrs ago hard to really say what it is.any codes on dash .have you drove it around and get it up to temperature and blow out the carbon and exercise everything .

 

[jocelyn gauthier]

Had code 12-22-30-84
Changed the pickup coil
I cleared them

They are old codes . they dont come back .

 

[jocelyn gauthier]

My tech said he would adjust the valve clearance because its stalling only when hot engine

Is he right ?

 

[tomanytoyz]

Ok .if they dont come back take the machine out if you have snow and run it and see.if no snow find a stand or some lift to spin track and get warm.

He maybe right ,check -lots of variables .

 

[tomanytoyz]

You said you got warm but need to put under real world test.

 

[jocelyn gauthier]

Yes i have a stand to spin the track. I did it.
Its really when its warm. I have to play with throttle .if not stalls immediatly.

The big black plastic idle valve screw doesnt change anything really. Cant seem to work because when warm it want to stalls..

 

[tomanytoyz]

Ok .some guys have good luck bringing the C0 numbers down more .you said you have -10.bring it down more ,.try this first and see. go down to -20.

Cant believe its valves with the miles.i have sportbike like my own with more miles with more abuse and valves are fine

 

[jocelyn gauthier]

Tried -25 no changes

 

[tomanytoyz]

I have always started my machine 1 a week since i bought it new ,every week for the past 8-yrs. always run Yamaha fuel products in everything i own and i have no issues with running or starting.

I am a firm believer in doing this and will not stop.

I have seen fuel and carbon and ruin things.

Maybe the guy that owned it before ran it hard.__ Nitrous ?

 

[jocelyn gauthier]

Nah. Its a old guy almost 60 years old.

 

[tomanytoyz]

If it was exhaust donuts you would hear it.

You said you are 3 owner.

What about the 1st guy.

 

[jocelyn gauthier]

I dont know the first and i dont believe it was hard ridden honestly. There is something wrong that someone could know the prob..