First Start of the Year - 1 Cylinder firing

[tomassend]

I have a 2003 Yamaha Mountain Viper. Last season I fogged down the motor, stabilized the fuel and shut her down in February. It ran perfect last year, jetted for 3-5000 ft at 0-20 degrees.

Just walked out to the sled tonight, popped a few gallons in it and turned it over. It started and lagged a little, but never got going. The only cylinder that is working seems to be the mag side.

I pulled the plugs, mag side was chocolate milk brown in color, the rest were gas logged. No warning light comes on either, it just bogs along. I ran it at idle for a while and it seems like one of the cylinders is put put put putting (like it wants to go) but never does.

Steps Taken:
- Disabled the TORS
- Disconnected headlight relay on clutch side
- Put in new plugs
- Gave some throttle to work the gas out


Anyone have any ideas? I am super stumped on this one.

Thanks in advance,

DT

 

[yamaha1973]

You havent cleaned your carbs yet? Pilot jets are probably plugged...

 

[tomassend]

I am definitely getting a lot of fuel, when I pull the spark plugs they are pretty soaked.

Would the stator be bad? I am not sure if a bad stator can run only one cylinder.

This bites.

 

[RXMax]

Get the carbs pulled and checked out. if you think its a spark problem pull the plugs and checked. Carbs should be pulled and cleaned every season on a 2 stroke.

 

[tcpeterson]

Like others have said, pull the carbs and clean them out. It may not even be the jets there are air passages that could be clogged causing the cylinders to load up to the point they can't fire.

If it ran fine when you put it away i'd put money on the carbs being plugged up.

 

[Yamaha_Ryder]

Carbs would be the first place I would look. Check exhaust for critter nests too.

Check the "technical pages" on www.totallyamaha.com for detailed instructions with pictures on how to clean those carbs.

Good luck!