96 Formula 500 L/C won't start - Snowmobile Forum: Your #1 Snowmobile Forum

roadstar03 · 01-20-2008, 11:48 AM

Hi everyone,
Newbie here with a problem, hope some one can help me out. My 96 500 L/C sat for two seasons, a couple of weeks ago I decided to get it going, finally we have snow, so I emptied out the gas tank and took the carbs of and cleaned thoroughly. Also pumped fresh fuel thru the pump to make sure it was clean. When I try to start it it will either back fire or it seems to bind up when it wants to fire. I have an electric start. First when I pulled the plugs they where getting wet, I assumed the crank case had gotted full of bad gas so I blew it out. When I pulled the plugs and watch for spark I noticed that the both plugs fire at the same time ? So my thought is seeing it is backfiring and binding up when it is due to fire that the CDI box is bad ? Has any one else run into this and could I be right about the cdi. This sled always ran great until it sat. Thanks in advance for your imput. Sorry for such a long question, but I wanted to give as much info as I could.

**RJ Gleason** · 01-20-2008, 08:50 PM

The plugs both fire at the same time (every 180 degrees) with the electronic ignition of the new sleds.

**smallengineguy** · 01-20-2008, 08:54 PM

Spark is right, wet plugs are not. Replace the plugs and try to start it with NO choke.

roadstar03 · 01-25-2008, 11:59 AM

I figured I'd give every one an update. My gut feeling was right, it turned out to be the cdi box. I got an aftermarket one from Al's and it started right up. Thanks for a great forum.