Mm700?

[Lt Rascal]

My father-in-law has a '98 MM700 that is always hard to start when it is really cold. We went to get it out of his storage unit Saturday. We pulled and pulled and pulled but it would not start. I checked to make sure the choke was pulling all the way up, filled the tank up with fresh gas, had spark all was good. So we winched it up into my trailer. Got it home pulled it into the garage. Sunday I went to try and start it and noticed the choke was still on from the day before. So I pulled on it and in 3 pulls it fired right up.

So My question how is by leaving the choke on helping.

 

[KFD070]

Was it warmer in your garage than your storage unit? I'm not a gearhead but not sure how leaving the choke on would help it start the next day???

 

[Lt Rascal]

The garage I put it in is not attached to the house so no it was not any warmer then the storage. I don't know how the choke helped ether or if it even helped at all. I just know that is the only thing that changed. We had tried a couple of time in the summer to start it wiel we were in the unit. I never would start. 90 + degrees never even try.

 

[swrev]

How long had the sled sat since it was last started? With my MTN MAX, if it's been over a month, I don't even pull the cord until I've put a little gas down each cylinder, then it fires right up. Until I started doing that, it seemed like I could pull forever and it wouldn't fire.

 

[Frostbite]

This may be the wrong thing to do but................................

I always shoot some carb cleaner into the airbox on sleds, bikes and ATVs before trying to start them if they haven't been run in a while. I have flattened many a battery trying to start my RX-1M, Wolverine, TTR, BMW etc.

Just about a 3 second shot into the airbox seems to light them right up. They may die in a second or two and another shot gets and keeps them running. I figure the carbs after being stored probably need some cleaning anyway.

Works for me

Frosty

 

[SD Coyote]

carb enrichener

My father-in-law has a '98 MM700 that is always hard to start when it is really cold. We went to get it out of his storage unit Saturday. We pulled and pulled and pulled but it would not start. I checked to make sure the choke was pulling all the way up, filled the tank up with fresh gas, had spark all was good. So we winched it up into my trailer. Got it home pulled it into the garage. Sunday I went to try and start it and noticed the choke was still on from the day before. So I pulled on it and in 3 pulls it fired right up.

So My question how is by leaving the choke on helping.

It sounds to me like your enrichener circuit could be partialy plugged. You probally should clean all jets and passageways if you pull all the float bowls. The enrichener circuit is the long gold colored one with the tiny hole, when looking from the bottom with bowl removed. If you spray carb cleaner through this small hole while manually holding the choke link wide open it should come out in the carb throat. Follow up with compressed air while holding choke link open and your starting system should be clean. When this system gets partially plugged it is like trying to start your sled with no choke. By leaving the enrichener turned on overnight and moving sled around it could have slowly filled the circuit allowing it to start.

 

[theultrarider]

My guess is this. When they sit long enough, the fuel will drain and/or evaporate out of the float boals in the carbs and you fuel lines and pump can go dry as well. When this happens, it's takes alot of pulling to get the fuel pump primed and pumping again to fill the bowls and get the motor to fire. I have 2 poo 800s and a 700. One of the 800's is terrible at doing this, I think the fuel pump is mounted alittle higher in this paticular sled so it goes dry easier. Takes a month or two of sitting for this to occur, but does so every time it's allowed to sit without running. The other 800 tales about 3 moths for it to happen. The 700 never has an issue??? Either a shot of starting fluid or a little gas down the spark plug holes with fire them up first pull, run a bit and die. repeat this cycle about 3 or 4 times and then the fuel pump will prime and you are off to the races. Beats pullin til your arms fall off. Had an old mm700 that was even worse. Start it once a week, and it would always start on the 2nd or 3rd pull cold.