2011 m8 bog off idle

[Cummins1]

Looking for help to troubleshoot my M8. ocational bog off idle when warm, especially if engine has been shut off for a few minutes, engine does not die, idles fine , I stab the throttle a few times, it then clears up and rips, no issues with midrange or top end power. No issues with starting either. I checked power valves this fall, very clean, 5000km. never had the engine apart. any help is appreciated. Thanks.

 

[gibsons]

Is this something out of the norm that you noticed or always been there? Reason being with the ones that I owned always seemed to load up on fuel on the bottom end. I ran a pipe and fuel controllers on 2 of them and the fuel controller helps. Is the sled stock?

 

[bkoz]

When's the last time your reeds were done?

 

[Jayste]

Welcome to Cat 800's, my '10M8, different buddy 's '12XF, '14M8000 & '09HCR all do it. The HCR did the oil delete and thinks it helped. I'm just used to it now, but have had a couple occasions where it got me into trouble or should I say would of got me out of trouble if it wouldn't of bogged.


Sent from my iPhone using Tapatalk

 

[Pilsner]

Check the reeds.

 

[RXN]

My 09 does that too.

If you figure it out let us know.

So far I've changed reeds. No change.
Disconnected the TPS. No change.
Today I rebuilt the secondary. New spring and rollers. And a new primary went it. With a new y pipe and can. Ran out of time to try it. But if the bog goes away I'll blame sticky clutching.

 

[mountianguy]

Looking for help to troubleshoot my M8. ocational bog off idle when warm, especially if engine has been shut off for a few minutes, engine does not die, idles fine , I stab the throttle a few times, it then clears up and rips, no issues with midrange or top end power. No issues with starting either. I checked power valves this fall, very clean, 5000km. never had the engine apart. any help is appreciated. Thanks.

One thing to do is always let it idle down after a wot run. lots dont and will pull up to the group and shut down and you will get a pop out the exhaust which is too much fuel and when they start up, the sled will bog until it cleans the fuel out. A low idle speed,loose throttle cable,broken or chipped reed,broken primary spring,worn belt,worn or sticky clutchs will cause a bog. As yours is occasional you can rule out some of the causes hopefully one helps. Good luck

 

[tmo1620]

Mine did it for three years, just the nature of the beast, once i put a pc5 on and full exhaust with intake the bog went away


Sent from my iPhone because I'm sledding or to lazy to get off the couch

 

[Cummins1]

Thanks for the replies folks, no engine mods other than an SLP can, Primary clutch and spring are in very good shape. I have not looked at the reeds and I usually let it idle for 10-15 secs after hard pulls. Engine did not bog when I bought it so I think I will start with reeds.

 

[NosRX1]

I put a 30 dollar timing key in mine and it worked great after that, advanced it by 2.2 degree's

 

[mtm]

5000 kms, its your primary rollers if you haven't replaced the clutch. Fought mine all last year, rips with a new primary this year.