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I heard same issues with the 880's when I was looking at kits. Specialty sleds told me every 880 kit they built for guys melted cylinders, they didn't even want to build them anymore. Met a few guys on the hill said the same thing about their 880's. I stuck with the 860. Still have problems, but...

Was his altitude sensitive? Mine Seems to happen any elevation. I'll try to track him down. I assume a dealer could pick up on the timing by jus hooking onto the computer? I don't have a spare ECM to try with, and frankly they're a bit of money to just dump if that doesn't turn out to be the...

It's possible they have just copied the design. Rktek has no knowledge of what they are building though, not from what they told me

There's vibration, as with every sled. Wether it's more or less than normal I cannot say, never really compared it. I would lean towards it being normal. I've never got a feeling that there was any excessive movement in the engine

I'm sorry, I realize I did not word that comment about fuel very well. I only meant it as, the octane is there, i may need more of it being delivered to richen it, but there should be no way that 60% c111 with 91 premium is not enough. Could just need more fuel altogether. Out of curiousity, on...

That's not what rktek says. As far as they're concerned specialty buys their heads, but the rest of the build they know nothing about. They didn't really offer much tuning or troubleshooting help because of that, which is why I came here.

Thanks. I have the ECM update on mine as well. My dynoport has no restrictor in it, but I'm selling the mbrp can, gonna swap that out. Picked up my jets and gonna try those. Thanks for the info, exactly what I was hoping for.

It's a specialty sled 860 with the rk tek 14:1 heads

I'm going to put it out there so we can forget about it, I will bet anything octane is not my issue. I already run much higher race mixture than Anyone has said is required, I'm even high for low elevation riding, and have ran different brands with no noticeable change. The only reason I...

Serious. This is honestly the first time I've ever heard any good spoken of twins on a doo

No thanks. Gonna stick with my dynoport. I've heard way too much bad about twins on doos, probably won't ever go that route, unless something changes.

They loosen at elevation too. Definitely not going back to stock pipe and can, I know that much. Weight savings alone is a big motivator not to. I'll have to track down a can

Ya, i already got the mbrp can sold now that I know, I think it was the skinz can that rktek recommended, any info on those? Could look into the jaws too. I'm running dynoport pipe, stock y-pipe right now though. I stayed away from twins, everyone I talked to about them said doo's did not match...

I don't even know what stock jets are, 440's are what we're put in when specialty sleds built and tuned it. I asked them recently about it because I want to try the 460's to get rid of my detonating problem and they said most guys running their kits are using between 440's and 480's. 500's...

Do not know the gasket size. The engine was built by specialty sleds

All the riding except for trail up and down should e between the 6000-8000 mark. Not sure what the octane would turn out to be, probably a little over 100, I know when the kit was built I was told 40% c111 in the hills and have always run more than that. I checked plugs once in parking lot and...

Haven't had time to look into it yet, works been busy since I've been back. Once I get time it's gonna go in to get codes read and cleared, hoping that puts me in the right direction, then bring it back and tear er down and figure it out. I'll keep ya posted. If you get yours figured out before...

Hey guys. Need some advice. Got an 08 xp, full motor rebuild about 900 miles ago, 860 with rk tek 14:1 heads. My last trip out I had some issues with the sled, from what I'm seeing on here it sounds like I've got rave problems, going to take the sled in to get codes read and cleared anyway. My...

That's impressive! Those 07's and '08's are notorious for blowing cranks. They have poor bearings in them from factory. Blew my 08 at 2100 miles, and it was one of many 08's that were being rebuilt at the same time with similar miles. The 07's have the exact same motor.

I am having a similar problem with mine right now too. Light started by coming on every time I hit powerband but still pulled hard, then it came on and stayed on, still pulling good, then on the trail up didn't seem to sound quite right at 8000, and lost a couple hundred rpm, then couldn't clear...