2008 800 dragon rmk bogging need help ASAP

[TheBCSledder]

Hi guys. I will start with a run through of a typical ride: I warm my sled up to 100 degrees before I move it, and 120 before I ride hard. For the first few minutes of ridding it is fine at whatever throttle position... a little low on power perhaps but maybe thats because it isn't clutched for my home elevation.... I know, I am working on getting it clutched right. After the first few minutes though, when I pin it, it bogs on wide open throttle. It also has a small mid throttle stumble which seems to be normal for these year sleds. also, I have only seen it happen once or twice, but sometimes if I give it throttle and then let off (like if I am getting unstuck or whatever) it will idle a few hundred rpm low for 20-30 seconds, then come back up to proper idle.

So, here are things I have done: replaced fuel filter, checked compresion, (120 both sides warm), looked at plugs (new a few hours ago), they looked a perfect brown, checked mag side power valve, (looked great, are they supposed to look completely dry)? New belt a few hours ago, secondary helix and rollers don't show excessive wear.

I am at a loss and really need help. I run 91 octane (E0), but last year ran 91 E10 for a few rides. thanks in advance.

 

[MORSNO]

You are probably hitting the common mid range lean spot that most fix with a PCV a adding fuel in the middle throttle positions.

 

[PaulAnd]

What's dry on the valve? Inside bellows? Outside bellows? Pay attention to where the bog is on the throttle, if it's at the same spot every pull suspect tps, check your ves system carefully, make sure they open when they should, check air box, and tb adaptor, check fuel pressure under load, tape a cheap gm fuel pressure gauge from napa so you can see it under load. 58psi?ish check your voltage gauge under load.. low volts=bog, Mid throttle issues... Last April flash cured mine, check the stickies at the top of IQ section for great info

 

[TheBCSledder]

thanks guys for the help, I will try these things. Paul, what do you mean bye check voltage? I don't have electric start. it is the metal valve its self that is dry

 

[PaulAnd]

Just pay attention to your volts gauge if its low you may have a voltage regulator issue, could cause a high load bog

 

[PaulAnd]

Just pay attention to the voltage gauge on your dash, if its low you could have a voltage regulator going bad, that can cause a high load bog

 

[PaulAnd]

Doh! Damn phone!

 

[diamonddave]

What are you running for clutching? Weight, helix, etc.???

Did you just buy the sled?

If this is happening when you pin the throttle, you could be experiencing a split-second over-rev that is causing the rev limiter to cut out the engine by the ECM. It happens often with on trail, light throttle and engine loads and transitioning to full throttle. Very common on all CFI's when the clutches aren't loaded enough. I would throw a couple extra grams of weight to the clutch to verify.

I fixed 5 CFI's last year with this same complaint (symptom) simply by adding more weight to the primary clutch.

If this doesn't fix it, then report back with what mapping you have, power commander, TPS setting and verification, etc. and we'll help you out.

 

[TheBCSledder]

What are you running for clutching? Weight, helix, etc.???

Did you just buy the sled?

If this is happening when you pin the throttle, you could be experiencing a split-second over-rev that is causing the rev limiter to cut out the engine by the ECM. It happens often with on trail, light throttle and engine loads and transitioning to full throttle. Very common on all CFI's when the clutches aren't loaded enough. I would throw a couple extra grams of weight to the clutch to verify.

I fixed 5 CFI's last year with this same complaint (symptom) simply by adding more weight to the primary clutch.

If this doesn't fix it, then report back with what mapping you have, power commander, TPS setting and verification, etc. and we'll help you out.

Thanks man will do... I know the clutching is too light for this altitude... I will get parts on the way and update you guys. does anyone have an idea of where to get weights/primary springs, and what kinds are good? I have heard great things about the OEM setup so I might just stick with that. And yes, I bought the sled near the end of last season.

 

[diamonddave]

I like the bellybuster weights Carl's Cycle in Boise, Idaho sells. They also have a proprietary cut helix that will really wake up that sled. Ask for Chris Kasel.

 

[TheBCSledder]

Got the head pulled off my sled today and found scoring on the mag side cylinder. I'll pull the cylinders tomorrow and see what I find. Hopefully all they will need is a light honing.