Fowled Plugs? - Snowmobile Forum: Your #1 Snowmobile Forum

BRANDOB · 02-04-2006, 05:54 PM

97 VMAX SX AFTER ABOUT 90 MILES OR SO THE SLED MISSES. PULL THE PLUGS AND THEY ARE FOWLED OUT WITH BR9ES PLUGS. SLED HAS BEEN JETTED AND HAS A BENDER PIPE. SLED RUNS STRONG UNTILL 90 MILES THEN STARTS POPPIN AND BACKFIRES. CHANGE THE PLUGS AND THE SLED RUNS PERFECT AGAIN FOR ANOTHER 90MILES. ANY IDEAS??

letitsnow · 02-04-2006, 06:11 PM

did this only start to happen after the pipes? if so try a br8es, if they still foul you might be a little rich.

BRANDOB · 02-04-2006, 06:17 PM

I JUST PUT SOME BR8'S IN BUT HAVE NOT HAD A CHANCE TO RUN THEM YET. THIS PROBLEM JUST STARTED TO HAPPEN, I WAS THINKING THAT SOMETHING MIGHT BE OFF WITH THE JETTING.

**smallengineguy** · 02-04-2006, 06:24 PM

Are the plugs a wet oily blackish color? If so, it's jetted too rich. Might want to go down one jet size.

letitsnow · 02-04-2006, 06:25 PM

if it was working good after you re-jetted then started messing up for no apparent reason something is wrong and changing the plugs probably won't help. your needles and seats may be leaking in the carbs.

BRANDOB · 02-04-2006, 06:36 PM

THANKS FOR THE QUICK ADVICE. THE LAST TIME I RAN THE SLED I DIDNT GO FAR ENOUGH FOR IT TO ACT UP BUT WHEN I PULLED THE PLUGS THEY LOOKED OK BUT WERE A LITTLE WET AND BLACKISH. I WILL CK OUT THE CARBS, I CAN SEE THE ISSUE WITH IT BEING JETTED JUST SEEMS WEIRD THAT IT DIDNT DO IT RIGHT AFTER I HAD IT JETTED. THAT WAS THE ROUTE THAT I WAS GOING WITH JUST WANTED SOME EXTRA ADVICE. THANKS GUYS I WILL LET U KNOW THE RESULTS.

BRANDOB · 02-04-2006, 06:37 PM

P.S. THIS IS A AWSOME FORUM GLAD I FOUND IT. THANKS AGAIN!

**RJ Gleason** · 02-05-2006, 11:22 AM

Caps lock broken?

BskidooC · 02-05-2006, 01:43 PM

how many miles are you supposed to get outa a set of plugs
I fowled my first plugs at 250 miles and its been about 300 miles since then is that good?

YamahaVector · 02-05-2006, 02:59 PM

Quote:

Originally posted by RJ Gleason
Caps lock broken?

It looks like it is working perfectly.

BC_Dan · 02-05-2006, 08:08 PM

Plug fouling is a sign of incomplete combustion. It is an indicator that you are too rich or have too much oil being injected. I replace plugs once a year just because, not because they are fouled. If you foul every 300 miles, figure out the reason, it's not the plug, it's the carb or the oiler. 1000-1500 miles is not unheard of on a set of plugs in a two-stroke.

Sometimes switching brands can help; sometimes going to a step hotter plug can help. Some sleds seem to run better on one brand over another (for example, the Liberty Polaris engines do not seem to run as well on NGK plugs as they do on the Champions.)

BRPforlife · 02-06-2006, 10:51 AM

I got 4000 km on my first set of plugs in my rev! Coulda kept going longer but switched to iridium plugs.

BskidooC · 02-06-2006, 08:16 PM

well the reason those went bad on mine was because a laid my sled over and it flooded itself then I cleaned them as best as I could but they still wouldnt work

BRANDOB · 02-14-2006, 09:49 PM

PROBLEM SOLVED. ONE OF THE PLUG WIRES WAS LOOSE AT THE BOOT CAUSING THE WIRE ARC AND MELTING THE TOP OF THE PLUG. I DIDNT EVEN THINK TO LOOK AT THE TOP OF THE PLUG