Got a slighty missing, staggering, or stumbling Nytro?

MotoPsycho · Oct 30, 2008

After an entire season of riding, multiple trips to the dealer, and several hundred dollars... I found my problem.

My sled would hesitate, sometimes with a slight pop (afterfire), upon a quick "stab" of the throttle. It didn't matter if it was from a dead stop, riding at constant speed, or slowly accelerating, it was after the "stab".

Although I prefer to do my own wrenching, I took it to the dealer on more than 1 occasion for this problem. (After all, that is what the great warranty!!! :crap:

)

The first few times, they dismissed it entirely. The 3rd time, I insisted it was a ridability issue, and I wanted it resolved. I metioned that they may want to check the throttle body sync as well, as this may be the root of the problem. This particular trip was also my 500 mile check-up. Much to my dismay, I went to pick up my sled, and had a $420 bill as well. It was okay though.... my sled was no different than when I dropped it off - miss, and pop included.

Anyway, long story short, it's all about the TORS system. Throttle cable slack is the key - you don't want ANY SLACK in the cable!!! (or at least "minimal" slack) If there is excessive throttle cable slack, the cam device in your flipper will activate the TORS for a split second upon a quick stab on the throttle, which drops the engine to idle for a split second.

Just my .02 - hope it helps someone else out

-Moto

Grimm · Oct 30, 2008

That's good to know. Sorry to hear that you had so much grief and lack of proper service.

gormleyflyer2002 · Oct 30, 2008

fairly new Yamie dealer I'm guessing.....? TORS can do some wacky stuff.

1049 · Oct 31, 2008

Whoa guys, this is backwards. No throttle cable free play will cause TORS to engage, that's how the system works.

Stock spec is 3-4mm of cable free play at the flipper.

But you're right about TORS being very sensitive, a simple handlebar adjustment can kick in TORS. For sure if bars have been changed to aftermarket.

bholmlate · Oct 31, 2008

Hey Motopsycho

Thanks for the information. i just added a throttle cable extension to my sled since i reased the bars a litle to fit me better over the summer. It sounds like the tors system is sensitive to any change to the throtle cable.

I have not had a chance to ride my sled yet but if ths condition comes up up i now know what is it linked to.

MotoPsycho · Oct 31, 2008

MotoPsycho said:
you don't want ANY SLACK in the cable!!! (or at least "minimal" slack) If there is excessive throttle cable slack, the cam device in your flipper will activate the TORS...

3-4 mm is the equivalent to .1-.15 inches... that is 1/10th of an inch - pretty minimal

1049 said:
No throttle cable free play will cause TORS to engage, that's how the system works.

I don't believe that statement is entirely accurate. I believe the system works because when your hand is on the flipper, it pushes the flipper down against what amounts to a switch adjacent to the flipper pivot point. If this "switch" is not depressed when the throttle position sensor shows anything but idle, it will not feed additional fuel to the sled. This action is what keeps the sled from feeding anthing but idle fuel to the engine if your hand is not depressing the flipper.

My cable had enough slack that when you depressed the flipper, there was not enough immediate cable tension to hold the flipper into the "switch". Go out in the garage and check yours out, you will see how it works...

Crewchief47 · Oct 31, 2008

This should clear up any confusion.

MotoPsycho · Oct 31, 2008

Thanks Chief. That illustrates what I was trying to explain; PERFECTLY!

It's almost as good as a service manual!
hee hee hee...

terret725 · Oct 31, 2008

i was having problems with my tors on my phazer last year. we had a sleat storm and i had forgoten to cover my sled. well a little bit of water had made its way into the area of the tors and froze so that some times depending on how hard, what angle or how fast i hit the throtel the tors would kick in. if i throteled up slow or had some pressure pushing the flipper towds the center of the bars it wasnt a problem but if i bliped it the tors wold kick in.

just another thing to look for if ur having an intermedate problem with it.

Vmax4 · Nov 2, 2008

The TORS sinario doesn't explain your issue with it stumbling when cruising along and you punch it. Unless you had a TON of free play. At 1/2 throttle you would already have the injector body side of the sytem switch activated and would be off the thumb side switch, when you punched it, nothing in the TORS would be at fault................ unless of course you let the throttle all the way off and the injector side was still activated (stuck throttle cable scenario) and the thumb side also came back into the loop.

Does that make sense? Hitting the throttle harder after you are already off the initial idle circut wouldn't be a TORS related issue in my opinion.

PLUS....... it would flash the TORS code on the speedo. Try holding your thumb switch from activation/deactivating and watch the speedo flash you the code.

MotoPsycho · Nov 2, 2008

You nailed it. I had just slightly over 1/4" of freeplay in the throttle cable. I believe that is why when I rolled into the throttle smoothly it worked ok, but when I stabbed it, it would pull the flipper side off of the swtch momentarily.

Like I say, this isn't the be-all end-all for everyone, but it cured my problem 100%.

BTW, I'm short, so the only time I see the pod is when I lean way forward over the bars.

I dunno if it ever flashed a code or not, and I'd have to assume that as it was a very momentary "miss", I'd not have caught it anyway?

racinstation · Nov 18, 2008

If you are on the trail and don't have a caliper, you can use a dime. I like to have the flipper so you can slide a dime in between it and the housing. Otherwise, measure it right.

MotoPsycho · Nov 18, 2008

Nice to see you over here too Racin'!

BLUEBALLER · Nov 21, 2008

I sure hope this is my problem as well!! I've got over 5000 kms and it just started to do it last week.

Replaced spark plugs & tested the coils - primary/secondary resistance measured within spec.

Thumb throttle slack is a little over spec - gonna tighten her up tomorrow and try it out.

fingers are crossed as the misfire is definately annoying as hell. sure can hear it out the exhaust.

thanks for the tip MotoPsycho!!

MotoPsycho · Nov 21, 2008

BLUEBALLER said:
I sure hope this is my problem as well!! I've got over 5000 kms and it just started to do it last week.

Replaced spark plugs & tested the coils - primary/secondary resistance measured within spec.

Thumb throttle slack is a little over spec - gonna tighten her up tomorrow and try it out.

fingers are crossed as the misfire is definately annoying as hell. sure can hear it out the exhaust.

thanks for the tip MotoPsycho!!

NP fella! I hope it works for ya!

It's not a huge performance issue, but it sure is annoying... ain't it!?!?

Got a slighty missing, staggering, or stumbling Nytro?

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