Ingine misfire with full exhaust? Fixes???

[berge75]

I installed a full exhaust, and with or without a fuel controller(dolbeck) I have a miss ,or like a skip in acceleration under rapid throttle movement. I have a afr meter,and no matter where I set the fuel it doesn't change. Seems like a tps issue,but not sure?

 

[Phyxius74]

Sounds like a TPS issue to me, but then you should have had the same problem before you put the full exhaust on. I know Yamaha have had some TPS problems on the Phazer FX but they do exist nn the FX Nytro as well. Just helped a friend to switch TPS earlier this week on his 08 Nytro RTX.

 

[poleclimber]

Look in the nytro mtx section. There was a topic like this in there. His problem was the throttle cable was loose.

 

[berge75]

Sounds like a TPS issue to me, but then you should have had the same problem before you put the full exhaust on. I know Yamaha have had some TPS problems on the Phazer FX but they do exist nn the FX Nytro as well. Just helped a friend to switch TPS earlier this week on his 08 Nytro RTX.

What where your buds symtoms on his sled

 

[poleclimber]

here it is...not sure if its the same but this was his problem. http://www.ty4stroke.com/viewtopic.php?t=62725

 

[NyTrOMaNIaC]

Did you adjust your clutching ? It's possible you're just hitting the rev limiter due to the added power of the full exhaust. I know when I just added a slip on to mine, I gained over 500 rpms at WOT. Check your rpms when you notice it, and if you're well over 9g, you know it's just what I said above.

 

[bottlerocket]

dirkdigger was just telling me that when you get off the throttle yama shoots air thru the throttle bodies to help with engine breaking. Like he said thats a instant lean conidition for a split second which feels like a miss. Dont notice it with stock muffler!

 

[NyTrOMaNIaC]

dirkdigger was just telling me that when you get off the throttle yama shoots air thru the throttle bodies to help with engine breaking. Like he said thats a instant lean conidition for a split second which feels like a miss. Dont notice it with stock muffler!

Perhaps ya just don't hear it with a stock muffler.

 

[bottlerocket]

Exactly

 

[yooper1]

It does NOT do it with the stock muffler. I had the same issue with mine and nothing fixed it, put the stock muffler back on Monday night. Done, it is gone.

Had a Barker with PCIII and also with my GEMS same dead spot for a moment under WOT.

 

[berge75]

I disabled the tors when it first started missing,wasn't it. It seems like a signal sending issue, because all the led's on the feul controller light up all the way across and blink at the piont of the miss.

 

[Phyxius74]

Sounds like a TPS issue to me, but then you should have had the same problem before you put the full exhaust on. I know Yamaha have had some TPS problems on the Phazer FX but they do exist nn the FX Nytro as well. Just helped a friend to switch TPS earlier this week on his 08 Nytro RTX.

What where your buds symtoms on his sled

Exactly the same as yours. Like a misfire under rapid acceleration.

 

[attakmod]

Mabe you can play with the Co settings to clear it up?

http://www.ty4stroke.com/viewtopic.php?p=576397#576397

 

[berge75]

Sounds like a TPS issue to me, but then you should have had the same problem before you put the full exhaust on. I know Yamaha have had some TPS problems on the Phazer FX but they do exist nn the FX Nytro as well. Just helped a friend to switch TPS earlier this week on his 08 Nytro RTX.

What where your buds symtoms on his sled

Exactly the same as yours. Like a misfire under rapid acceleration.

Had a chat with Ullmer,(thanks Allen), Finger pointing at tps as culprit. Going to try a new one see if that takes care of it.

 

[poleclimber]

Stupid question but what is TPS do and stand for?