Viper (Very) Cold Starting

[cdnredline]

Anyone having issues with starting the new Vipers in cold temps. We are talking -20F (-29C) or colder?

 

[Yamadog]

Anyone having issues with starting the new Vipers in cold temps. We are talking -20F (-29C) or colder?

crank a bit if it does not fire bump the throttle and hit key again

 

[Studroes144]

Started mine yesterday at -10. Turned the key to on, let the fuel pump cycle then I shut it off. Tuned it on again and let it cycle then cranked it and it fired right up only turned over 2-3 times and took right off. When mine is hot it has somewhat of a starting issue. Will quite often misfire on first crank and then it'll take off after that. Hopefully an update will be out soon for it

 

[Alpha]

same with mine. When its cold it starts fine. But when warm it takes longer. Has to be in the mapping inthe ecu.

 

[Studroes144]

The xf7000 seems to be much better with warm starting. It has happened a few times were it didn't start right away. But the viper it happens nearly every time. Must be ecu issue

 

[Nytro40th]

no issues here and its been over -30 here in southeastern manitoba

 

[cdnredline]

It likely has to be -18F or colder to notice what we have up here.

 

[Nytro40th]

I meant celsius

 

[loudelectronics]

Southwestern MB it has been -40 with windchill and no problems with starting.

 

[cdnredline]

Southwestern MB it has been -40 with windchill and no problems with starting.

Glad to hear it as I'm guessing you were at the -30C that we had in Saskatchewan. We had experienced some no starts on the Vipers when below -30C though. On one unit with 200kms on it at -32C (sat outside all night) we had the engine turn over well but not fire. Covering the exhaust pipe outlet with our mitt then cranking over for a few seconds produced an almost start. Removing the mitt then turning the key had the Viper running.

FYI wind chill is not relevant on your car or sled - see quote below from University of Alaska
"If we were to take an engine block and install it on mounts in the middle of a field for the winter, it would make no difference in the temperature of that engine block if the wind blew or not. It would remain at the ambient temperature of the air surrounding it, whether or not the air was moving. However, if we were to start up that engine and let it warm up, there would be a great deal of difference in the block temperature depending on whether or not the wind was blowing.

Any object that creates its own internal heat will find that heat is removed from it faster if the air around it is moving. It is simply a matter of heat transfer--the "conveyor belt" of moving air (convection) will snatch the heat away much faster than if it were still.

So the answer to the question is yes. Wind chill does affect machines, but only if they are at a temperature above that of the surrounding air. "

 

[loudelectronics]

It also affects them when running lifepo batteries. They need to generate heat to get power to start. Running the earth x 36d and they still started. Sleds started including my nytro at -33. Sleds kept outside in elements.

I am aware of how windchill works. Just stating the temp as that was how cold most report around here cause that is what it feels like.

Both nytro and viper took some cranking and fuel priming but they both started.

 

[misterbrutus03]

When its cold it starts fine. But when warm it takes longer. Has to be in the mapping inthe ecu.

Sounds to me like Yamaha never found a good map for these Vipers cause the prototypes I rode last season were the same way. Yamaha had the tune correct in the Nytro's...
Can't even imagine!! Oh wait I can!!

 

[Nytro40th]

It also affects them when running lifepo batteries. They need to generate heat to get power to start. Running the earth x 36d and they still started. Sleds started including my nytro at -33. Sleds kept outside in elements.

I am aware of how windchill works. Just stating the temp as that was how cold most report around here cause that is what it feels like.

Both nytro and viper took some cranking and fuel priming but they both started.

I was thinking of running that battery for the weight loss alone, I have heard mixed reviews, what do you think?

 

[loudelectronics]

Curious of what mixed reviews you have heard?

Ran it in my nytro all winter last year. Run them in my quads to cause they are better for winching.

They work good at -23 and up with no battery cycles needed to warm up. Once you get to -30 you have to leave key on for a bit to warm battery up. Once warm they turn sled over just fine.

A quick 10 lb weight loss.

If you want one, I have some extras kicking around new in box.

 

[Nytro40th]

I heard the negatives on some forum, no personal experience myself. pm sent