apex stutter at wot

[ebockus]

i have done a ton of searching but still have this stutter when i pan it. if i feed it to wot its ok for a second then will drop rpm and sounds like a rev limiter. its been deep snow so im only hitting 10,000 rpm. if i go from 1/8 throttle to wot its just stutters and hits 9000. like its dropping a cylinder. i changed my cr10ek plugs. it got better but is still there. i read about tors issues but it sounds like they have different symptoms. i tested my tps and i think the spec was 3.5-4.0 volts at wot and im like 3.4. the idle volts were in spec. thoughts? 2006 apex with 15000k

 

[HABS 1]

stator on its way out?check with a meter just to eliminate, the sled is at its miles for a new 1!

 

[ebockus]

its been doing this for the last 4000k. i hardly pan it wot but its annoying me now lol. i know the sensor on stator goes or u mean something different? what test do u mean? ohm reading on coils? not sure y the stator would make it "miss" at wot. it really feels like bad plug or injector or coil. i unplugged coils one by one at idle and it definitely changed the idle. not sure how else to test for injectors or coils

 

[Teamblue4]

Change your belt.

 

[ebockus]

belt is within spec at 34mm

 

[HABS 1]

ya ohm reading at plug to check, but i understand what u mesn it could test good but be cutting out at higher rpm, my 06 has bout same miles and stator went out when i went to get it out of storage, its almost like clockwork when they reach that milage, was just a thought to check! good luck

 

[ebockus]

ya ohm reading at plug to check, but i understand what u mesn it could test good but be cutting out at higher rpm, my 06 has bout same miles and stator went out when i went to get it out of storage, its almost like clockwork when they reach that milage, was just a thought to check! good luck

I thought when they quit they were dead dead? do they give the symptoms i describe when they start to go? thanks

 

[HABS 1]

i personally have had 2 stator issues with yamaha sleds 1 on my apex and years ago on my 700 triple and ya both times they were " dead dead" but have also herd of gyes experienceing cut out symtoms at high rpm or ilde fine but not getting rpm over 4000 etc with a bad or weak stator but again just throwin it out there , it lots of money to spend not to cure problem iknow!!

 

[ebockus]

i forgot to mention i can hear it cut out on idle sometimes. could be unrelated. i was reading today on how to test the ignition coils via resistance. i will test them see where we are at. also that injector 4 is a common failure. not sure how to test that.

 

[sideshowBob]

My Attak developed a stutter or stumble a couple years ago when you wacked the throttle open and performed poorly at full throttle. I had changed the exhaust donuts to copper the year before and they were all leaking. Once I fixed the exhaust issue the stumble was gone and it has performed flawlessly ever since.
It would be worth checking your headers and donuts for leaks.

 

[ebockus]

copper donuts. i passes the plug the exhaust and let it stall test. but i agree. thanks. keep it coming

 

[ebockus]

wait... u said your copper donuts were leaking. hmmm. i have copper but if i plug exhaust it does stall. i have had blown donuts before and never experienced this. its just like it drops a cylinder. its something for me to think about anyway... wonder if a little exhaust leak combined with my tps running a hair outta spec is making it do this. i dunno tho. its brutal when u do it. sounds bad.

 

[ebockus]

checked the tps by holding reset and select then turning the key on and hold for 8 seconds. d1 comes up. then press reset n select for 3 seconds do1 comes up. the number at the bottom of the screen was 16 closed and 95 wot.

 

[ebockus]

i changed my plugs. bypassed tors. added fuel via c0. plug were lean. headers and air box. mashed the throttle a dozen times in the field. wham. 10,800. sweet. see how it holds up on the trails. i think it was tors. the plugs were new this season. and i only changed one that looked a little shinney. it felt really bad before. like it was dropping two cylinders. im thinking tors was retarding the timing. i have been fighting this for two years. i dont mash it much. no need on apex on the trail so i didn't bother with it alot.

 

[ebockus]

when i mashed it before it would hit ten then drop to 9 making a bad sound