Winder cuts out

[Another Phase]

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

I've had all the sensor lines removed and blown them out. Didn't find anything in them.

 

[Sledroll]

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.

Its a shame you had an experience like you describe , as you missed having the mind blowing performance of a properly running SW, as I and most have had .

 

[Another Phase]

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.

Wow, I can't believe that Yamaha has not figured this out when so many are having the same issue. I'm really disappointed to hear your experience and hope that I don't have to resort to getting rid of the sled. I feel like I've barely had a chance to ride this one. Still have my '13 Apex which has been flawless and I would never have a second thought about striking out on a journey on that one. I figured the 998 would be just as reliable being a Yamaha engine.

 

[jetpilot785]

Its a shame you had an experience like you describe , as you missed having the mind blowing performance of a properly running SW, as I and most have had .

Believe me, I tried my #*$&@ off to make them run as they were a blast to ride but after a season and a half of issues and ruining several week long vacations, it wasn’t fun anymore and of course the dealers never heard of such a thing so I was on my own trying to figure it out. I tried everything short of replacing every sensor on the machine to see if I could narrow it down but with a 5 year warranty I wasn’t about to start spending money I shouldn’t have to to try and figure this out. I was losing riding time trying to dick with these things so I told myself I would rather take a hit on power and have 2 good consistent reliable machines than to be farting around with 2 sleds that wouldn’t run right. It’s so embarrassing getting passed on the trail by people riding 20 year old sleds because your brand new 17k sled can’t go over 35mph without back firing and stalling in the middle of corners. I almost got rear ended a few times because people would roll up on me and it would stall mid corner trying to accelerate out of it. My girlfriend ended up almost hitting a tree because her sled backfired in a corner, scared some birds and one hit her in the face as it was accelerating after the backfire and she blew the next corner because she didn’t expect the backfire or acceleration after the backfire and then the bird to top it off so I was like, nope, now these are becoming a safety concern so I sold them both. I even told both guys that bought them that they did that and they both said that’s what warranty is for and the one guy even said his sons does the same thing and that didn’t stop him from buying hers. I just said ok brother, as long as you know about it so you don’t yell at me later when you ride it and it runs like dog #*$&@.

 

[Sledroll]

Wow, I can't believe that Yamaha has not figured this out when so many are having the same issue. I'm really disappointed to hear your experience and hope that I don't have to resort to getting rid of the sled. I feel like I've barely had a chance to ride this one. Still have my '13 Apex which has been flawless and I would never have a second thought about striking out on a journey on that one. I figured the 998 would be just as reliable being a Yamaha engine.

I was concerned, when I bought my 2017 SW LTX LE, based on limited seat time on a Viper , that I would like the ride of the chassis , that I kept my 2015 Apex XTX LE , with the Star suspension, that I absolutely LOVED !
I never rode the Apex again , and ended up selling it after it sitting in warm storage for 2.5 years.
Never have been towed home , but have towed others home .
I even flashed it to the 240 in the 3rd year , and had even more fun !
I would buy another one in a heartbeat . Or the new SW .2 version !
The 3 year warranty has come in handy , axle replacement , for a poor design issue , but never stopped working.
I snapped a primary spring in 3 , and the only clue it had happened , was the track creeped on the stand , and the acceleration was not quite as snappy , as once it was replaced .
I hope I haven't jinxed myself . but I am very happy with this sled.

 

[jonlafon1]

Fuel level is half full.

The reason I ask is I had 1-2 occasions where my sled would show the symptoms you describe. And it was when I was under a quarter tank or less. I was never able to figure if I had bad gas or it was related to fuel level in tank. 7500 miles on a 17.

 

[4strokes]

I would settle tank to a corner and get a sample for water

 

[Hammer Down]

Try a bottle or two of dry gas worked for me same issue

 

[Hammer Down]

Try a bottle or two of dry gas worked for me same issue

I had to run it bucking and farting for 5 or so miles

 

[yamamarc]

I seen similar issues (backfiiring running like crap ,cutting out ) with bad 3 bar map sensors on tuned sleds. Maybe worth a shot to swap the map sensor with a buddy and see if it cures the issue

 

[geez150]

I seen similar issues (backfiiring running like crap ,cutting out ) with bad 3 bar map sensors on tuned sleds. Maybe worth a shot to swap the map sensor with a buddy and see if it cures the issue

Any idea if you can test the map sensor with a meter and test for resistance? Not sure if doing an ohms reading would prove whether or not the map sensor is good or not?

 

[Another Phase]

Any idea if you can test the map sensor with a meter and test for resistance? Not sure if doing an ohms reading would prove whether or not the map sensor is good or not?

That would be nice if it's possible. I'm trying to rule things out as I go, so today I bypassed the roll over valve, drilled out red return fuel line elbow and then pulled the fuel pump and sender so I could have good access to the inside of the tank.
I cleaned the inside of the tank so it was spotless and added fresh fuel. Ran it on the stand and it seemed a bit better, but was still stumbling when under load and backfiring. It feels like it runs out of fuel when you load it hard and the you get a lean backfire. No flames out the exhaust so I doubt it's overfueling.
As a side note, the first time it happened I rode it back to the trailer over 60 miles and it did it the whole way. It was not an intermittent issue. The farther I went the less rpm it would allow me to achieve before falling down and backfiring. The exhaust side of the sled was way hotter than normal. It was hot enough that I couldn't ride with my boot in the footwell because my foot and right leg felt like they were up against a wood stove.

 

[Turboflash]

I would suspect bad sensor. ECU is confused - some input is out of range or wrong. MAP, boost sensor, etc.

 

[maim]

sounds like it is going lean. might be fuel pump slowing down or fuel pressure regulator sticking in an open position.

 

[AAdavis]

I have a 2020 SRX with a Hurricane 270 flash, 3 inch exhaust, 3bar Map sensor and piggy back intercooler. From day one it would fall flat on its face with a fast throttle opening. A/F ratio would go right to 16/1 when it did it. Called Dave, also read everything and thought about it for days. Today I put the stock Map sensor back in and PROBLEM SOLVED! Runs like a raped ape now. I was on the best traction snow yet today and at about 95mph it hooks up and feels like another gear!