Nytroed
Veteran
Hello everyone I have a 08 nytro that runs lean with fuel control box maxed out. The sled used to have a 240 kit now has 180 switched fuel control box and nothing. Mpi has been 0 help anytime I called. I ride 7-10000 ft and 7-8 # of boost. Sled seems to run OK till you try to gain rpm then a pop and Afr jumps to 20s. Anywhere to start?
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- Snowmobile
- 2020 Sidewinder SRX
Are you sure your AFR sensor is good? What fuel controller are you running?
Nytroed
Veteran
I have changed the sensor and the fuel controller. I have the gems controller. The fuel pump is a mpi upgrade but it starts weak then turns to a fast squeal. Not sure if that's normal.
- Joined
- Apr 13, 2003
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- Schofield, WI
- Website
- www.totallyamaha.com
- Country
- USA
- Snowmobile
- 2020 Sidewinder SRX
If you have the gems maxed out and the AFR is lean, you have the wrong controller.
kingtut
Expert
I was also thinking this. Anyone near you have a 180 kit?
Nytroed
Veteran
I have the 240 controller and the 180 controller and have swapped them back and fourth no change. I am the only 4 stroker out here.
- Joined
- Apr 13, 2003
- Messages
- 21,311
- Age
- 54
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- Schofield, WI
- Website
- www.totallyamaha.com
- Country
- USA
- Snowmobile
- 2020 Sidewinder SRX
Something else does not add up.
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- 2016 apex xtx
2011 apex xtx
2009 phaser rtx/x
1997 et410t/r
1988 vk 540
is the fuel pressure dropping on it?
Nytroed
Veteran
That I'm not the only 4 stroke on the mtn? Ya tell me about it I've scrambled everything that I could think of I am a pretty decent mechanic and I understand most all of it. Any other thoughts?
Nytroed
Veteran
I'm not sure my pressure tester will be in tonight. I wonder if the injectors are malfunctioning?
- Joined
- Apr 13, 2003
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- 21,311
- Age
- 54
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- Schofield, WI
- Website
- www.totallyamaha.com
- Country
- USA
- Snowmobile
- 2020 Sidewinder SRX
I have installed an Apex Charger that run ok until I added a little box from Dave at Hurricane and 2 Nytro Chargers and they have worked pretty good box stock 180hp at sea level. Could be fuel pressure or a bad controller.. I am at a loss. If you don't like dealing with MPI, contact Dave at Hurricane. I had a strange spot in my first Apex that he figured out for me. I was chasing my tail for 2 years on it.
Nytroed
Veteran
Ya I am going to check the pressure this weekend. And I will have to try to find his his number and see what he says. That's kinda where I'm at!
- Joined
- Apr 13, 2003
- Messages
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- Age
- 54
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- Schofield, WI
- Website
- www.totallyamaha.com
- Country
- USA
- Snowmobile
- 2020 Sidewinder SRX
I wish I could be more help. Hard to help when you can be there to actually hear and see what its doing. Daves number is 613-925-2019, thats the last number I show or check online https://www.facebook.com/Hurricane-Performance-Canada-Inc-655887444516904/
Nytroed
Veteran
Hey thanks I appreciate it all everything helps! This Colorado weather is changing towards winter I hope and I want to ride the fat nytro my little my 850 is too light and nimble. I kinda like to feel like I went to the gym a day or two! Lol
Nytroed
Veteran
So I lifted the track and 13.9-14 at idle 11.2 at 2500rpm 13 at 3000 Afr then a fast roll into full it jumps to 20s-30. 1.5 # at idle. Pressure Gauge hasn't showed up yet any thoughts with new info?
