Idle.

[Mike]

HELP! I have a 98 yamaha250hpSWS EFI. The problem I'm having is she won't stay at idle It will start up in aturn of the key 'but after a minute or so'it will spit and die. high rpms are no problem. This is what has been done so far .all new filters,throttle control valve ,ox sensor ,new fuel,new plugs

 

[DaleH]

Plug gap?

Any VST filter?

 

[Megabyte]

Happens to me from time to time...
I just throttle up a bit while she is warming up, and all is good. :wink:

 

[Fishinfireman]

I would check the low pressure fuel pumps for leaks. I don't know that this is your problem but they are simple to check and repair. A leak can affect your idle.

 

[Parker23]

My 200hp ox66 does same thing, if it starts with a crappy idle i turn it of and restart it and it runs fine. 8)

 

[gw204]

Does it just do it once, or does it constantly do it?

If it's a consitent problem, sounds to me like you have a fuel line blockage.