Ok I'm new to the sledding scene but I'm have issues with my m7 when I got it a few weeks ago it would pull hard then it would bog out with not much snow so I changed plugs and put new gas in it cleaned power Valves and put new reg fuel in it It ran pretty good pulled hard 95% of the time Then I filled tank with 5 gallons of premium and it ran like a piece of crap since. Just changed plugs and wires tonight took it for a ride tonight and won't pull worth a crap almost sound like it's not firing on both cylinders I'm kinda stuck pulled the plugs and both are a bit wet any ideas where I should go from here
2005 m7 power issue
- Thread starter z400
- Start date
moyiesledhead
Active VIP Member
M7's run like crap on premium. They only require 87 octane. Use that and you'll be fine. Also, the white plastic spring adjuster on the secondary has a habit of backing out and letting it stay in high gear when it should be back shifting. That adjuster should be cranked in about a half inch from the outer face. That could be your bogging problem. But first get rid of the premium fuel.
Most of 'em also don't much like aftermarket cans. Stick with the stock exhaust.
Most of 'em also don't much like aftermarket cans. Stick with the stock exhaust.
Last edited:
- Thread starter
- #3
Yeah your sled recommends the use of 87 not 91 or whatever your premium is. But make sure to check that your power valves are set right cause they might not be opening all the way. Check what your rpms are at when you are wide open throttle they should be from 7200-7400 I think but I could be wrong.
moyiesledhead
Active VIP Member
7800 max on an M7.
Your power valves start to open around 6000-6500 so there could quite possibly be a problem there. Normal symptom would be flashing the fault code for servo motor failure.....don't remember which one that is. Do one thing at a time though or you'll never know what it was. Get rid of the premium fuel first and try it, then go from there.
Your power valves start to open around 6000-6500 so there could quite possibly be a problem there. Normal symptom would be flashing the fault code for servo motor failure.....don't remember which one that is. Do one thing at a time though or you'll never know what it was. Get rid of the premium fuel first and try it, then go from there.
cnelson6
Active VIP Member
Sometimes they won't flash the code I chased that problem for a little bit on one of my sleds. It was a real intermittent problem! But as suggested eliminate one thing at a time so you don't just throw money away on something that doesn't need replacing.
- Thread starter
- #7
Are they realy that finicky that premium will cause this I bought the wife one and the guy told us he ran premium in it all the time but I will defiantly try that cause befor I added the premium it seamed to run a hell of a lot better
catinthehat
Active VIP Member
Yes they are that finicky on premium. As stated before they also don't like aftermarket cans, at least mine didn't. I put an SLP can on it and it would run fine for awhile then fall on its face. Maybe adding a fuel controller would help but I just went back to stock and rode the hell out of it.
- Thread starter
- #9
Ok I put new EEG gas in it and same thing it's 6800 and falls on its face I can cokes it to 7000 it seams to run strong to that point so is it power valves or clutching which I have no clue about I just can't imagine clutching as it has pulled good a few times so that to me rules out clutching but I could be wrong
apex88
Active member
Had the same problem, intermittently bog out and hold 6500 rpm, drove me crazy trying to find it, turned out to be faulty servo motor for power valves, if you've got a buddy with a cat just swap it to confirm before buying a new one!
cnelson6
Active VIP Member
I have a servo motor for a m7 pm me if you end up needing one. Also before you buy a new one check your cable length cause if that's out if will cause some funny stuff also!
- Thread starter
- #12
I'm not getting a code for servo but my wife has a m7 also so it's worth a try where exactly do you measure from on the cable is it from the end of plastic to the end of cable or to end of the led ball thing I know it's 1.35 inches so sounds like I have to be pretty dam persice
I had my M7 do what it sounds like urs is doing. turns out thepower valve cables were out of adjustment. Guy at Argyll Motorsports told me that the computer would lose track of where the valves were and would close them. With the valves closed the motor would be gettin way to much fuel and would bog. adjusted the cables and the problem was gone. Mine did not like an aftermarket can either but I ran premium all the time and had no issues with it.
- Thread starter
- #14
moyiesledhead
Active VIP Member
- Thread starter
- #16
Ok now I have a delemia it was messing around like normal for about the first 5 miles and I just kept it off the pipe then I just kept easing into it alittle at a time and it started pulling hard every time I got on it then shut it down for a few minutes then it acted up once then pulled hard again until I was done for the day so I'm a bit confused what the hell is going on is it power valves or something else still seams like power valves to me but why does it work intermittently could it have something with the temp outside or what I'm confused
cnelson6
Active VIP Member
Sounds like the servo to me.
moyiesledhead
Active VIP Member
Check/set your PV cables. Should do it every year anyway. Also check the atmospheric vent tube off your ECU. If it's plugged it'll cause problems, especially with altitude/weather changes. Also check your secondary. The white adjuster should be screwed about 1/2" in from the outer plate. Check this often, they tend to back off. Check your secondary rollers while you're at it. They tend to get lumpy or scuff the ramps and cause shifting issues which become bogging problems that feel like fuel issues but really aren't. You mentioned you have another M7. Just swap the secondaries and take both sleds for a rip to see if the problem switched sleds. Easiest way to troubleshoot a clutch problem when you have parts to swap. We do it that way lots.
Last edited:
calgarysledguy
Active VIP Member
If its not your power valves then Check your primary clutch over well. I had an intermittent power/ bog. It would run good then sometimes not. It was a clutch roller and weight problem for mine.15 miles later i figured it out.
Similar threads
