jetpilot785
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- Feb 8, 2014
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4strokes
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- Mar 13, 2018
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- 51
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- charlemont ma
- Country
- USA
- Snowmobile
- 18 winder xtx 09 nytro xtx 06 apex gt
mine did it once, near new, frozen morning after warm up. seemed dead obvious to me it was sensor related. bypassed roll over and never happened again. my guess is the roll valve sends in a glob of frozen goo to the intake. the valve has an upward neck that fills with milky oil and freezes
jetpilot785
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- Feb 8, 2014
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Just tried the bypassing the ROV theory this weekend and still cuts out. I inspected intake and airbox and no oil so my issue isn’t oil fill or oil injestion related. Doing it more and more when coming off throttle into a corner and laboring up top. Still feels like fuel starvation as it did from the get go. Taking both sleds to dealer to be plugged in and see if any data had been recorded in ecu. If nothing, then the next step is to look at fuel pump and fuel pressure regulator.
piskapo
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- Feb 18, 2012
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- 84
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- 46
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- Barrie
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- Canada
- Snowmobile
- 2014 Viper LTX-SE 240 Hurricane Turbo Kit
I had same issue. I upgraded my fuel pump and fuel regulator and it's working perfect now.
jetpilot785
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- Feb 8, 2014
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What parts did you upgrade to if you don’t mind me asking? OEM or aftermarket? Tuned ecu or stock? How many miles since upgrade? Any repeats of backfires or cut outs since upgrade? Any info would be great. Thanks
piskapo
Extreme
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- Feb 18, 2012
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- 84
- Age
- 46
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- Barrie
- Country
- Canada
- Snowmobile
- 2014 Viper LTX-SE 240 Hurricane Turbo Kit
I am TD tuned. I added TD fuel pump and regulator. I rode this past weekend did approx 600 miles no issues. Before the pump and regulator I had cut outs.
jetpilot785
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- Feb 8, 2014
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Thanks for the info. I have a feeling it may be pump/regulator related. You’re not the first to report a change to one or both with satisfactory results. This year is done so I will have to play with them next year more but if nothing shows on the plug in, then I will change the pump and regulator and see what happens.
Another Phase
Extreme
Forgive me if this has been addressed somewhere else. I searched and this thread was what came up. I have the falling on it's face and backfiring issue, but it hasn't gone away. I can replicate it on the sled lift in the driveway in above freezing temps after the sled has spent days in a heated garage. I have checked everything mentioned here and am at a loss as to where to go next. Is the fuel pump or regulator the fix that actually worked? 2017 with 1000 miles on it. Ran great last season and first ride this year it acted up within the first 10 minutes and has not stopped. Premium fuel with Seafoam and octane boost. Pulling my hair out!
jonlafon1
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- Aug 18, 2014
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- 50
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- USA
- Snowmobile
- 2022 Sidewinder LTX_SE
2024 Catalyst RXC
2017 Sidewinder LTX-SE. 11750 miles (SOLD)
No codes? Checked all wiring harness? Any chance you checked UNDER fuse panel? The block up front in nose of sled. I have a 17 with 7500 miles and mine is fine but guys have pics on here showing wires rubbed. Did you change the plugs? Make sure the plug caps are tight and pushed down ALL THE WAY. Just throwing ideas man. Sound maybe electrical.
jonlafon1
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- 4,102
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- 50
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- USA
- Snowmobile
- 2022 Sidewinder LTX_SE
2024 Catalyst RXC
2017 Sidewinder LTX-SE. 11750 miles (SOLD)
Is the fuel tank filled full?
upnumber6
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- Jan 3, 2016
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- 102
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- 35
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- Winnipeg
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- Canada
- Snowmobile
- 2007 apex rtx, 2011 apex se
I’m not sure if it fixed mine or it was a coincidence. But I took all the lines off the sensors below the fuse box. Let them hang down over night(don’t forget where the go). Took the sensors out blew them out with my mouth and since I was that far I took the inter cooler out and set it so it could drain out. Next day put it back together and never had an issue since
jonlafon1
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- Aug 18, 2014
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- 4,102
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- USA
- Snowmobile
- 2022 Sidewinder LTX_SE
2024 Catalyst RXC
2017 Sidewinder LTX-SE. 11750 miles (SOLD)
Well did you find the problem??
Another Phase
Extreme
No codes. I have had everything apart, intercooler off and drained a small amount of oily residue, pulled everybsensor hose and blew out, removed air filter and intake tube that feeds the turbo after finding a bit of oil in the filter and tube. Completely cleaned before reinstalling.
Changed the plugs because the PTO side plug showed a different colour around the outside. Thought that was it, but no love. I replaced the main relay and fuel pump relay with sealed relays. I'll check under the fuse block for rubbed wires. Thanks for input, everything helps.
jetpilot785
Pro
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- Feb 8, 2014
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- 131
I believe it’s sensor/ecu related. I ended up putting an AFR, boost/vac and fuel pressure gauge on my sled to see what was going on when it happened. It wasn’t fuel pump or regulator related. I tried 3 different fuel pumps and 2 different regulators and still had the same issue. When it would cut out, the fuel pressure stayed constant and boost would drop a little as exhaust pressure would drop but the AFR’s went from averaging 11.8-12.2 at WOT to 22.4 which is the highest the gauges reads and is also the default number when you first calibrate the sensor. So what I believe is happening is a sensor is tripping and the ecu is shutting down the injectors and depending on how bad the sensor is whether it’s moisture related or what, depends on how bad it acts up. Sometimes I was limited to 3/4 throttle and about 6-7lbs of boost and could muster 80-90mph and sometimes it would be as bad as couldn’t get out of vacuum and could only go a max of 30-35mph. The second season, I tried flashing the ecu with a hurricane 225 87 oct flash to see if it was a programming issue from the factory, swapped over to a walbro 255lph fuel pump, dried out all sensors and lines and also removed intercooler and drained any oil or water residue and it ran good for 52 miles and started doing it again. I then switched out regulators and tried another new fuel pump and no change.
I got tired of having 2 sleds doing the same thing and sold them both and I am still getting surveys from Yamaha about the sleds continually going in for warranty work for the same issues I was having so even the dealers haven’t figured it out yet so I’m glad I got rid of those junk piles. I have since went to the new 2019 ZR7000’s and with clutching and gearing changes, I’m almost as fast as the sidewinders I had ever were which was 99-100 on the speedo which I thought was low for the sidewinders but the pull they had was nice. The 7000’s don’t pull as hard but they pull hard enough and with the 21/41 gearing I put in them, they have noticeably less track spin compared to the sidewinders so they feel almost as strong from 0-80 as the winders did and so far with only 1 day of testing the new gearing in 35* air and softer snow conditions, I saw 96 on the speedo so I bet with good conditions, they will be 100-102 on the speedo which was about what the sidewinders were on their best day. I’m even using the same skis and tracks off the sidewinders for equal testing comparisons.
Long story short, I’m glad I ditched the sidewinders and went back to the NA motors. The sidewinders were fun for the first 900 miles but then they were a bear to ride and the issues were intolerable to me and honestly, the NA motor with the clutching and gearing changes is perfect for the trails we ride. We were never really able to utilize the sidewinders added power anyway so these are trouble free and way more practical anyway so it worked out for us in the end.
Another Phase
Extreme
Fuel level is half full.
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