Winder cuts out

[geez150]

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!

Did you get an knock lights with the three bar sensor, When the sled was acting up?

 

[AAdavis]

No. It quit running until you let off the throttle and picked it back up slowly. Seeing 17lbs of boost and 11/1 A/F readings now.

 

[geez150]

How are you seeing your A/F ratio?

 

[ClutchMaster]

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.

 

[KnappAttack]

No. It quit running until you let off the throttle and picked it back up slowly. Seeing 17lbs of boost and 11/1 A/F readings now.

3 bar tune is different than a 2 bar tune. and will give you a warning on your phone if you have it connected to the flasher on the sled. 2 bar tune will never read higher than high 16 - low 17 lbs. Hence the reason to use the 3 bar tune to see what the actual boost is.

 

[Doowithblue]

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!

Apparently his new 3 bar tunes are fixed but yeah i had same issue. I thought it was a bad sensor but it wasn't.

 

[geez150]

Apparently his new 3 bar tunes are fixed but yeah i had same issue. I thought it was a bad sensor but it wasn't.

Are these updated flashes stock muffler tune or performance muffler?

 

[ClutchMaster]

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 assume your not tuned? Stock everything?
It’s possible your O2 sensor has $hit the bed, they are commonly a problem as vehicles age.

Also a bad backfire can ruin the map sensor.

I wouldn’t rule out the fuel pressure regulator, but it’s fairly uncommon they fail. When they do, the diaphragm leaks and floods the engine through the vacuum line, so that’s probably not your issue.

If it were me I would replace the O2 sensor.
Your symptoms are in line with such a failure.

You can disconnect the battery, this will clear the fuel trim table. Upon restarting it should run better for a limited time. That’s the way most vehicles are anyway.

 

[Doowithblue]

Are these updated flashes stock muffler tune or performance muffler?

Everything is updated now as far as I know with no known issues.

 

[AAdavis]

How are you seeing your A/F ratio?

I have a three inch exhaust with a bung in it. I already had a wide band A/F ratio meter so I just hooked it up. Then I added a boost gauge.

 

[AAdavis]

Apparently his new 3 bar tunes are fixed but yeah i had same issue. I thought it was a bad sensor but it wasn't.

Well either my sensor is bad or something else changed. I have not put the three bar sensor back in to see if it now runs on that.

 

[AAdavis]

3 bar tune is different than a 2 bar tune. and will give you a warning on your phone if you have it connected to the flasher on the sled. 2 bar tune will never read higher than high 16 - low 17 lbs. Hence the reason to use the 3 bar tune to see what the actual boost is.

So if I put the 3bar sensor back in and it now works I am going to have more that 17lbs of boost?

 

[AAdavis]

So am I reading this right that the Hurricane 27o tunes with 3 bar sensor did not work right at some point?

 

[KnappAttack]

So if I put the 3bar sensor back in and it now works I am going to have more that 17lbs of boost?

No, it takes a different tune for the 3 bar vs the 2 bar, the sled will not run properly if you have the wrong map sensor or tune in it.

You can only see over 17 lbs on the dash or logs if you have the three bar tune and map sensor in it.

 

[Doowithblue]

I just assumed everyone knew you can't just toss in a 3 bar in a 2 bar menu and expect it to run. However the early 3 bar hurr tunes some guys had issues with. All I'm saying is this has since been corrected.