issue with 2006 yamaha apex er

[yamahinn03]

Throttle overide system, bypass and see what happens. Should be in owners manual

 

[Hammertime]

Hard to tell but is sounds to me like it's missing across the board. How many miles?
If you have new plugs in it, I would throw a compression test at it to rule that out. Check the connections at the coils and the injectors too! I know there watertight, but I would look in those connectors. Gotta be one of the 3....Fuel, Ignition or Compression.

It does sound like it's missing. Start with coil packs and plugs.

 

[rx1pat]

Sound quality wasn't the best, but sounds like exhaust donuts/cracked y pipe to me. Let it idle and stick your head underneath and you will hear the leak if there is one. And while it's running, put your hands over both ends of the exhaust and the sled should bog down/almost stall if the donuts are good. If it doesn't the exhaust is bad and time for new donuts and possibly a y pipe.

 

[rear2high]

X2 on fresh gas,get the seafoam out of there, had h can in my boat with a 4.3 and would hardly run until siphoned out and put fresh gas in and then pured like a kitten.

 

[troyhatt]

definately not running on all 4 put fresh gas and change plugs. then go from there. check the exuast donuts as well.

 

[Paulson14]

just got back from working away. Fired up my apex when its in rich mode it runs fine after its warmed up it backfires and miss firers. it bogs down when i put my hand over the exhaust going to change the plugs tonite. What kind of plugs is everyone using oem? or aftermarket and what kind.

thanks

 

[steve barber]

start with the simple things, fresh gas get old out , ck battey. I would becareful of bring up rpms like that your belt is going to be junk, put back up in air becareful

 

[MacAttak]

Check the exhaust Donuts.

 

[sledneck22]

A quick way to rule out the exhaust donuts is to let the sled idle, take two decent thick shop rags/towels, and plug both exhaust tips. If the sled continues to run your y-pipes/donuts are shot. If the sled kills then they should be alright but worth checking. (cover exhaust tips for 15-25sec) This is a quick way to eliminate that idea.
In my opinion, it doesn't sound like it is running right. If you are going to replace the plugs go with either stock, CR9EB, or a tad more HP CR10EK. I have 10EKs in my sled and have never had a problem plus dynoed at 2-3hp more.
And like everyone else said... Ditch the gas as soon as possible and start with fresh stuff... Wouldn't even hurt to get 91.