Any fix for bog off the start? - 09 M8 HCR

[Sergeant HCR]

My HCR is stock and only has 320 miles on it. The reason for the low mileage is because I bought it new Fall 2009 and then early March 2010 went on sick leave. I had it out for a second ride this season today and another for tomorrow.

Anywho, I haven't been keeping up with the forum but was on here tonight looking for anything new on the bog I get when I start to move. Once I get moving 2-3 seconds later the big clears up.

I have an O-ring around the two tabs on the oil pump for the sticking issue. I also redid the belt deflection which seemed to help somewhat.

It's not good in deep powder when you need that power from the start.

Thanks in advance for any help

 

[RickM]

If your HCR is totally stock i would check your belt deflection one more time.
You want your belt to come up about 1/8 inch above the driven clutch, when set properly. If you set it correct your belt may squeel slightly when it idles.
this will give you the lowest ratio in your clutching. It just may correct you initial bog, its worth a try. I have an 09 M8 SP and thats the way I have mine set and its great. If you make any changes to air box you may create a bog also, but stock should not bog for you . Hope this helps you out.
RickM

 

[Sergeant HCR]

I checked deflection again and it was still slack. I maxed out the shims in my clutch and it was still slack. So I popped in a new belt I had as a spare and deflection was on the tighter end of normal.

That seemed to work for stopping and moving again but when I shut the sled down for a short period and start it, it often backfires and that bog is there once I give it gas and after 2-3 seconds it instantaneously clears up and I got all my power back.

 

[mmsports]

fuel pressure

Lower your fuel pressure if it rich on bottom end the your fuel pressure is probable just to high.

 

[rocketball]

lots of 09's seem to have this bog down low....My 09 crossfire has always had it. For instance if u are crossing a rd it always wants to load up. What does your sled engage at? I had a yellow/white primary spring go weak on me and my engagement was down around 3400. I replaced it and the higher engagement at 4000 helpes clean up the low end bog. But if u ride deep snow u may not want that high of an engagement.

 

[Frostbite]

That's strange.

What color primary spring do you have installed? Could your dealer have done a not so hot specialized setup for your particualr area?

I introduced that strange bog on my 09 M8 Sp last weekend with MDS weights and a Speedwerx 125/340 spring. It was weird, I have used that same Speedwerx spring with MTX weights with no bog but with the MDS weights it created a bog. Go figure. I put a Polaris 100/340 in the next day and the hesitation/bog was gone.

So, you may want to try another primary spring and it also may be your clutch weights are too tight. What RPM did you say your engagement was coming in?
I found a M8 last weekend that had a horrible nearly 6,000 RPm engagement. It turned out the clutch weights were way too tight. They should swing freely with the nuts on the weight bolts just tight enough to keep the O rings where they need to be. There's a fine line there.

Best of luck.

 

[Sergeant HCR]

Thanks for the replies. My engagement is around 4k if I recall. The spring is the titanium spring that came with the HCR's and its yellow/white. On Browns, there isn't different springs for different altitudes. I ride 0-3000ft. The dealer did tell me they prepped it for low altitude. There should be 77g weights in the clutch. Might not hurt to pop it off and give it a look over.

Either way, I still think its a fuel issue where the sled loads up, more so when shutting down for a few minutes and starting again versus stopping for a few seconds and moving again. Like I said, often it backfires when starting warm.

Also, I don't recall this when I first got the sled in the Fall of 2009. I may have noticed a tiny hesitation but nothing serious.

I also like to check the reeds. Doesn't seem to be a small job though to haul those out.

 

[rocketball]

my 09 crossfire 8 likes to backfire when the temps are warm....scares the crap out of people sitting at the pumps who are filling there vehicles ...i also think its louder now with the SLp pipe

Thanks for the replies. My engagement is around 4k if I recall. The spring is the titanium spring that came with the HCR's and its yellow/white. On Browns, there isn't different springs for different altitudes. I ride 0-3000ft. The dealer did tell me they prepped it for low altitude. There should be 77g weights in the clutch. Might not hurt to pop it off and give it a look over.

Either way, I still think its a fuel issue where the sled loads up, more so when shutting down for a few minutes and starting again versus stopping for a few seconds and moving again. Like I said, often it backfires when starting warm.

Also, I don't recall this when I first got the sled in the Fall of 2009. I may have noticed a tiny hesitation but nothing serious.

I also like to check the reeds. Doesn't seem to be a small job though to haul those out.

 

[greatnorth]

Low Elevation HCR with bog

Buy a PC-V and take fuel away from 750 rpm too 3750 rpm. You will have to play with it on the laptop. start at approx minus 9% at 750 and work down grad too minus 1% at 3750. You need too slope delivery.You know you went too far if you have a lean bog . First two fuel positions only! You will have to do some reading and absorb info first.

 

[Sergeant HCR]

That PC-V idea seems interesting but thats quite the extravagant solution for a problem on a stock sled.

I went out to look at it tonight and the o-ring I put around the 2 tabs on the oil pump is still there. I swapped in some new plugs too. The old plugs were black and somewhat crusty.

I wanted to haul the airbox out and throttle bodies but didn't have the time to take that apart for the first time. I need to read up on some instructions first.

 

[troyburt]

That PC-V idea seems interesting but thats quite the extravagant solution for a problem on a stock sled.

I went out to look at it tonight and the o-ring I put around the 2 tabs on the oil pump is still there. I swapped in some new plugs too. The old plugs were black and somewhat crusty.

I wanted to haul the airbox out and throttle bodies but didn't have the time to take that apart for the first time. I need to read up on some instructions first.

bring it to me in clarenville, i have got my 09 m8 running from what i can tell really good right now. be happy to have a look.

 

[blackie205]

what helix do u have in it make sure they did not put a crossfire helix in it that will cause a bog bad,my dealer did this to my m1000 was bad,if your helix is 42 or less u should be good and try a y pipe cleaned my buddys plugs up leaned out a bit

 

[Sergeant HCR]

@troyburt: I didn't notice you were from Clarenville. I'm in St. John's. If I was closer I'd run out with it. Thanks for the offer but I'll keep that in my back pocket for now haha

@blackie: I put new plugs in it to try tomorrow when I go riding. I'll also double check the helix. Thanks.

 

[jayman]

Do you have a can on this sled? If u do put the stock one back on and i bet the problem goes away...................

 

[Sergeant HCR]

Do you have a can on this sled? If u do put the stock one back on and i bet the problem goes away...................

No can. The sled is 100% stock minus a tether switch.

 

[Powder Buster]

Motor Mount?

I know your sled has low miles but might want to look at the engine mounts, mag side in particular. I've been chasing my tail on the sluggish low end of my '09. Tried new primary springs, mds weights, deflection and nothing changed it. Just found that my mag side engine mount is shot with just over 800 miles on it. It doesn't look bad until you really look at it closely and see that the rubber is seperated from its metal casing. That might also explain why your deflection is only good when you take all the shims out.

Something to look at anyway,

Good Luck

 

[Sergeant HCR]

I know your sled has low miles but might want to look at the engine mounts, mag side in particular. I've been chasing my tail on the sluggish low end of my '09. Tried new primary springs, mds weights, deflection and nothing changed it. Just found that my mag side engine mount is shot with just over 800 miles on it. It doesn't look bad until you really look at it closely and see that the rubber is seperated from its metal casing. That might also explain why your deflection is only good when you take all the shims out.

Something to look at anyway,

Good Luck

I checked the mount that is visible over the mag and it seems ok. But my deflection is good with extra shims, not removing shims. Either way, a new belt seemed to fix the deflection issue.

My power valves also are free moving. I put in new plugs but didn't make a big difference.

Getting a PC-V is an awfully expensive solution.

I'd like to try and identify the problem 100% before throwing money at it.

I do get good gas mileage. I matched a 2011 Backcountry after an 80+ mile run.

 

[troyburt]

I checked the mount that is visible over the mag and it seems ok. But my deflection is good with extra shims, not removing shims. Either way, a new belt seemed to fix the deflection issue.

My power valves also are free moving. I put in new plugs but didn't make a big difference.

Getting a PC-V is an awfully expensive solution.

I'd like to try and identify the problem 100% before throwing money at it.

I do get good gas mileage. I matched a 2011 Backcountry after an 80+ mile run.

what helix are you running? what weight cam arms?

 

[CATSLEDMAN1]

bog

this issue was resolved on several 08's when we plugged in another brain box.

one was ok after reflashing, one with square box was replaced after several reflashes. my o7 has that isssue just less intense, its in my box, i have run several other boxes and all significantly has less bog............never have made it go away entirely. ridden a lot of m8s there to some degree on all of them, been an issue since day one.

likely not clutching, you can engage an M8 at 3000 in deep wet snow and they will pull hard right from the bottom with stock secondary and correctly adjusted belt.

 

[Dam Dave]

Thanks for the replies. My engagement is around 4k if I recall. The spring is the titanium spring that came with the HCR's and its yellow/white. On Browns, there isn't different springs for different altitudes. I ride 0-3000ft. The dealer did tell me they prepped it for low altitude. There should be 77g weights in the clutch. Might not hurt to pop it off and give it a look over.

Either way, I still think its a fuel issue where the sled loads up, more so when shutting down for a few minutes and starting again versus stopping for a few seconds and moving again. Like I said, often it backfires when starting warm.

Also, I don't recall this when I first got the sled in the Fall of 2009. I may have noticed a tiny hesitation but nothing serious.

I also like to check the reeds. Doesn't seem to be a small job though to haul those out.

Yellow/white spring is not Ti, Ti spring is not painted

put a fresh spring in, they loose performance over time, break often also