Weird issue on first ride.

maxout01

maxout01

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Ballston Spa, ny
sled runs great except when it gets up to 5-7,000 rpm, or just a quick blast of throttle. it kinda bogs and loses rpms until about 3-3,300rpm. While that happens if I give it any throttle it bogs to 2,800 rpm no matter how much throttle I give it. Seems almost like its trained, lol! Its not really a typical bog, its kinda like you just driving around and running great it just stops moving and loses rpms until at around 3,300 again then its all good again. It happens more after quick blasts of the throttle, and when I give throttle up to higher rpms. My girl friend last year said she was going up a hill and it all of the sudden bogged like this and rolled down the hill back wards until it hit 3-3,300 rpm and then came back again, that was nerve racking to hear. Anyone know where I should start??
 
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daman said:
Clutching? you over shifting?? hows it going max havent heard from you much this season hiding out? lol
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Hey there!! Yea I haven't been on in along time. I've been really busy this year and basically didn't touch my sleds or even think about snowmobiles until about a month ago when I striped my rev down and went through it. Just in the last week have I been on here, dootalk and the local sled sites. The poor ol' yami sat in the trailer untouched from march till today.. I feel bad for it sometimes.. How you been?

Now to the sled.. I throughly went through it last year and fogged it before parking for the summer. It was showing signs of this last year, but only happened once according to the girlfriend (I never road the sled last year but once, she did the whole season). Now this season its very intermittent and much worse when it happens. But it happens so quick I cant tell if its carb related or clutching.. Both clutching last season were completely rebuilt and everything in them is new..
I'll be honest after I posted this thread I went out for a quick ride it rode it extremely hard as I wanted to see if it got worse or not. It got better and completely went away until I was on the way back and then at around 5,000 rpm did it again, and I gave it gas during it and it completely bogged, dropped to 3,300 rpm and would not come above that until a few seconds later and then was fine.. that to me seems to be a carb issue, am I thinking wrong here??
 
Been good same ol stuff just a year older right,lol...

anyway Hmm weird,hard saying what it could be on this side of the keyboard,id try cleaning carbs, check clutching again, fresh gas,fuel delivery etc, etc..

is it poping or backfiring at all? next time it boggs hit the choke see if it comes out of it.
 
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Thanks guys. It makes no popping or anything at all. Basically if you give it a good throttle it will hit higher rpm and then just slow down in rpm to about 3-3,300 rpm and during that time if I try to give it gas it will bog to 2,800 rpm and then a few seconds later back to normal. The more I look into it the more it looks like tors is activating..
 
I doubt it, most of this is a ten minute ride around the yard, lol! Theres no snow to ride any trails right now.
In fact before I even put the belt back on when I first started it was the first time I noticed it. Without the belt after it warmed up I gave it a few good blasts of throttle just sitting there. It happened every time, then still did it when I took it for a few rips.
 
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maxout01 said:
sled runs great except when it gets up to 5-7,000 rpm,
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It's not tors then my friend,,if that was the case you wouldnt get her over 2,800-3,000 EVER and it would sound like a rev limiter on a car, bla,bla,bla.....

people are to qwick to blam tors for this stuff
 
I had simaler problems with a sled that did what you described.. It was a bad seal in the crank! Hope thats not your problem.
 
daman said:
It's not tors then my friend,,if that was the case you wouldnt get her over 2,800-3,000 EVER and it would sound like a rev limiter on a car, bla,bla,bla.....

people are to qwick to blam tors for this stuff
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Thats what I thought but after searching I've found a good 15 threads with the same issues and tors was it. I'm just guessing I haven't looked yet, we still dont have more then 2" of snow on the ground so It may be awhile before i can take it on a good enough run to check it out.

The tors activated a few years ago on this after putting the throttle cable to tight and it did not act like bla,bla,bla it simply dropped in rpm, and bogged and then came back. Weird.. maybe its been f-up all along, lol!

I'll be out tomorrow am checking it out. I'll start with unhooking the tors and then check the clutches. Could be both, lol!
 
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yammy said:
I had simaler problems with a sled that did what you described.. It was a bad seal in the crank! Hope thats not your problem.
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how did you find that to be the problem? In order to find that you would have to take the whole motor and everything out, which in return you may have solved the problem and found another all in one shot..
 
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daman said:
Let us know max....
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I will! This sled has always had a weird issue from time to time were it would bog and do this. Then it stopped for two years, and now its back with different symptoms, could be a number of things. I think I will start with the tors, since its the easiest, then if thats not it I'll take the clutches off and run it on the lift and see if the motor does it with some throttle bursts cause thats how it first happened. Honestly the sled is fresh out of the trailer. Needs plugs fresh gas and lots of other attention, so could be anything. I'm surely not riding it for awhile going by the freakin forecast..
 
what about wire rub through? float level if it happens on long bursts of throttle, pulls then flattens and or bogs,bring back to idle or low rpm then hit it and it does it again just a thought
 
It could be anything really. This sled has been a trailer queen for two season ever since I bought my 06 mxz. The yami hasn't been apart in along time. Carbs have not been touched since I think 2007-8 season, it has been on the same belt for way too long also. Last season I changed the chain case oil, and greased it all and rebuilt both clutches. That sums up the maintenance, lol! It went from 1,500 miles a year with full tear downs and going throughs at the end of the seasons to maybe 150 miles last year and then 9 months locked in a trailer. I'm thinking of taking the doo way up north tomorrow on the state trails might take this one too and ride it around alittle theres nothing here to test it on.. who knows though my mind changes every 5 mins, lol!
 
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