mxz 670 sparkplugs - Snowmobile Forum: Your #1 Snowmobile Forum

zipper670 · 01-21-2008, 06:58 PM

I have just bought a '97 MXZ 670 and it runs great, but the spark plugs have fouled 3 times in a week. They seen to foul after its been idling a long while. This the first time I’ve owned a ski-doo so i don’t even know how to set the carbs, and there is no factory setting on the hood of the sled, that i can see anyway. Any help would be greatly appreciated, thanks.

-Zipper670-

**smallengineguy** · 01-21-2008, 07:46 PM

Plugs should be a BPR9ES. It may have stuck choke plungers.

zipper670 · 01-21-2008, 08:18 PM

How would you check that?

widetrack man · 01-21-2008, 08:53 PM

These sleds are a bit hard on plugs, with the 583's and 670's, if you don't drive them fast, then you will be certain to blow a plug. I don't own one, but seen 2 or 3 that all do the same thing. I don't know if this was any help or not, but just wanted to let you know.

**smallengineguy** · 01-22-2008, 07:24 AM

The chokes are the cables that go into the carb off to one side. Use a 12mm wrench and remove the nut that goes into the carb. The choke plunger should lift up and out of the carb if they are OK. If they are stuck, that's your problem.

jay80 · 01-22-2008, 10:29 AM

no choke, primer.... Mine sometimes fouls plugs if the sled idles for long periods of time when cold or if its started and shut off a few times before its fully warmed. Make sure you gap is correct and carb is tuned right. I always carry 4-6 plugs with me when I ride just in case. Its rare that I foul a plug during a day of riding, if it happens its usually at first start of the day and during warm up.

zipper670 · 01-22-2008, 03:25 PM

I totally agree with above, I have yet to foul a plug when on the trails, it is only when I am just starting out or warming machine up. Thanks for everyone’s help, I can relax and have fun now, rock on!!