bluelightning
New member
hey all,
just arrived back home from a weekend of snowmobiling up in pittsburg new hampshire. was expecting the time of my life, until i ended up having to ride a polaris 550 air cooled rental
when we arrived and unloaded, we were just puttin around the lake a bit waiting for everyone else to get ready (our cabin was right on the lake it was sweet). after zippin around for about 20 minutes, i lined up with my buddy on his mxz670. we ran back and forth a few times, and on the last run, WOT the rpms dropped to 7500 and was makin a bogging noise, let off the gas and it died........tryed to start it and the pull cord would not budge. walked away fed up throwing a tantrum like a little baby back to the cabin, and one of my buddies went to see what i was talkin about and wham, started right up for him! and it was runnin fine also. figured i would zip it around a bit more to make sure there were no further problems. ended up doing it again, with the same result. dropped to 7500 rpm, dies when i let off the gas, when i went to pull it it wouldnt budge, but if i pulled it very slowly through one rotation, i could then start it up fine!
then here comes the good part. was ridin on the trail, and she started coughin and bogging, sounded like a fouled plug. left it running, pulling one wire at a time so i could tell which cylinder the problem was on, and i narrowed it down to the mag side. changed all the plugs anyway and tryed firing her up. started up fine, but was still only runnin on 2. yamaha dealer was only a few miles down the road, so i decided to limp it down. tech came out and took the plug out, put his thumb over the hole as i pulled it over, and he proceded to tell me "you're f*cked" out of curiosity when i got back to the cabin, i tryed this out, as no one had a compression tester. the mag side pulled much weaker than the other 2.
was just serviced professionally 2 weeks ago, cleaned and adjusted carbs and power valves, tuned my clutch and new track. was running like a raped ape in the snow we got around here last week.
what happened? and what caused it to happen? any ideas would be great
needless to say, it really sucked riding a rental all weekend
just arrived back home from a weekend of snowmobiling up in pittsburg new hampshire. was expecting the time of my life, until i ended up having to ride a polaris 550 air cooled rental

when we arrived and unloaded, we were just puttin around the lake a bit waiting for everyone else to get ready (our cabin was right on the lake it was sweet). after zippin around for about 20 minutes, i lined up with my buddy on his mxz670. we ran back and forth a few times, and on the last run, WOT the rpms dropped to 7500 and was makin a bogging noise, let off the gas and it died........tryed to start it and the pull cord would not budge. walked away fed up throwing a tantrum like a little baby back to the cabin, and one of my buddies went to see what i was talkin about and wham, started right up for him! and it was runnin fine also. figured i would zip it around a bit more to make sure there were no further problems. ended up doing it again, with the same result. dropped to 7500 rpm, dies when i let off the gas, when i went to pull it it wouldnt budge, but if i pulled it very slowly through one rotation, i could then start it up fine!
then here comes the good part. was ridin on the trail, and she started coughin and bogging, sounded like a fouled plug. left it running, pulling one wire at a time so i could tell which cylinder the problem was on, and i narrowed it down to the mag side. changed all the plugs anyway and tryed firing her up. started up fine, but was still only runnin on 2. yamaha dealer was only a few miles down the road, so i decided to limp it down. tech came out and took the plug out, put his thumb over the hole as i pulled it over, and he proceded to tell me "you're f*cked" out of curiosity when i got back to the cabin, i tryed this out, as no one had a compression tester. the mag side pulled much weaker than the other 2.
was just serviced professionally 2 weeks ago, cleaned and adjusted carbs and power valves, tuned my clutch and new track. was running like a raped ape in the snow we got around here last week.
what happened? and what caused it to happen? any ideas would be great
needless to say, it really sucked riding a rental all weekend
