Would you go back to a carbed mountain sled???
- Thread starter machinest660
- Start date
Had two 550 rmk that had to be jetted for every where we went that was different elevation. Pain in the a$$. I had a carbed 2004 600 rmk with the ATTAC system and never had to re-jet it once. ran great. Then got 3 600 rmk all cfi. they are all pull and go which is so much better
That's blasphemy talk right there!
To get back to the subject matter I really like the fuel injection but never really had much problem with carbs so depending on what I was starting my project with carbs would be an option for sure. machinest660 if you rode a carbed sled at Revy you would just have to take it easy on the trail in until you gained some altitude. If you want to have your sled running close to maximum efficiency at all times though CFI is the way to go. I guess I never spent much time upside down so the carb flooding was never much of an issue for me.
G
gman086
Well-known member
Exactly! If you understand what the different jetting systems do, and know how to tune, I found BRP's setup rather enjoyable and my Summit still runs better than my Pro but I'm a pretty damn good tuner if I do say so myself (you have to like to tinker). My '11 Pro's map isn't optimized like the latter model years and you have to get a damn $500+ fuel controller to do any tuning (and tuning IS necessary with each and every performance mod you do). I don't miss the upside down starting issue tho when I'm on the Pro! Half dozen one, six of the other - I can and do live with both!
Have FUN!
G MAN
Never had any issues with carbs, but I like the injection for the pull and go deal , however I will say if your in the boonies and the injection takes a dump good luck fixing it, I can pretty much get a carb deal running no matter what happens, even if you had to gravity feed the float bowl lmao .
But ill stick with the injection....just to nice not ever messing with it.
But ill stick with the injection....just to nice not ever messing with it.
I finally replaced my 03 RMK 600 this year with a new pro and can't wait to go play with my first injected sled. I have ridden that 600 since it was brand new and whether it was going to run right in the mountains from trip to trip was always a mystery. It's had a tempaflow installed on it since new but sometimes it wouldn't idle at altitude or simply would barely run at all and it was anyone's guess when it would happen. My dad had a 03 700 with ATACC and it never ran right in the mountains no matter what. EFI all the way!
I didn't have any issues with my TM40 flatsides on my Polaris.
I got the needles and pilot dialed with my porting and twin pipes and never looked back because I used a needle shim kit and the multi-range Variflow.
Most people that had big issues with lean spots and flat spots weren't due to main jet problems.
They were due to pilot and needles.
I got the needles and pilot dialed with my porting and twin pipes and never looked back because I used a needle shim kit and the multi-range Variflow.
Most people that had big issues with lean spots and flat spots weren't due to main jet problems.
They were due to pilot and needles.
I've never ridden anywhere but Michigan and Wisconsin, but I rode all last season with a carbed sled rolled it over multiple times with no start up issues, I always jet mine about 3 steps lower than stock. Ive loved the reliability nor all my carbed sleds bought a 600cfi at the end of last winter I rode it 3 miles before it blew up. With that said I now have a 15 RMK 800 CFI. I do agree though cleaning/rejetting carbs sucks.
With a setup attacc or dpm, and a decent flatside, there should be no runability issues. There have been some stupid OEM carb experiments, like the 02 summit, that are tougher to work around. But the vast majority with the right air density scheme installed for your riding, like holtzman's, can be setup and tuned for your mods, and then just ran. You MUST be able to tune idle, pilot, needle (size and shim) and main circuits, with or without an air density device, or find someone who can. That's becoming a lost skill for some under 30 now.
Are there a few posts insinuating that you are concerned about issues with the fuel injection system? Granted I'm sure there have been some issues, but few and far between.
Patience young grasshoppers...snow will be here before you know it!
Its just an idea I had been thinking of for some time now. A carbed premix 660 or 685 pro, timbersled suspension. C3 belt drive. Camo extreme 2.5 and a few other goodies. 400lbs ish. 150hp. I think thats a recipe for one hell of a fun sled. Just wanted to here others opinions on carbs in the mountains. We alway ran carb sleds in the prairies but never changed jets till spring when the weather warmed up.
Yes! We build a 2013 Pro with Carbon Fiber body parts and Titanium suspension and bolts with a PAR 1100 in it. We opted to go with Lectron Carb for light weight and tunability. If I remember right we lost 10 lbs going with carbs (this does not include removal of the oil system). The sled runs great. Carbs work awesome when set up correctly. It does take a little more time and know how though.
It is interesting to notice that all 3 manufactures are running carbs on their snocross race sleds too. I am curious whether carbs will make more power on an identical sled with EFI. Considering taking two pro's and getting a CDI and carbs for one and running them side by side to see if there is a difference. Hardest part is that the motor will need to be raised up a bit for the carbs to clear the Jackshaft.
It is interesting to notice that all 3 manufactures are running carbs on their snocross race sleds too. I am curious whether carbs will make more power on an identical sled with EFI. Considering taking two pro's and getting a CDI and carbs for one and running them side by side to see if there is a difference. Hardest part is that the motor will need to be raised up a bit for the carbs to clear the Jackshaft.
Wow thats a wicked looking sled thanks for posting. I never gave that a thought of having to lift the motor for carbs to clear... thanks for that tip. I am sure Brad at PAR would be able or already has made motor mount plates if I decide to go through with this idea.
i made a topic about this a while ago. the KISS sled (keep it simple stupid) a company out there gives you what you need to bolt the 800 cylinders to a 600rr bottom end in a iq. What i propose is the same idea with 858 jugs on a 600rr cases bolted into a pro. maybe lectron 42 carbs.
Nothing wrong with carbs, less things to break or go wrong. everyone loves efi, till it leaves you stranded.
Nothing wrong with carbs, less things to break or go wrong. everyone loves efi, till it leaves you stranded.
H
hoov165x
Well-known member
Bingo! The Lectron is key here. The Miks are absolute junk! Finicky, overly sensitive junk. Lectron's newest owner has spent a lot of time in redesign and development for two stroke application. I have one on my WB165 Husky (a big bore 125) and it incredible. The power is smoother and the carb works well from sea level to 6,000 feet and temperature changes in excess of 40 degrees- ALL WITH NO ADJUSTMENT. Because of the design, it has somewhat of a compensating ability. My TMX couldn't stand a 5 degree change in temperature or a 200 foot change in elevation and I was always jetting it. If the manufacturers had ante'd up and bought Lectron carbs we wouldn't need FI now.
I ran the Mikuni tm40 flats (they were straight bored too almost 42mm) on my 1155 twin. Had ZERO reliability issues. Probably Could have picked up a couple top end ponies but had great bottom end and mid range.
Sweet,which flywheel,stator and cdi do you use on this? Are you using mikuni tps?twin pipes?
I just came from owning three Ski-Doos, and their DPM for alt. change worked great. I just hated trying to start the dam thing after roll over or sitting facing to steeply down hill.
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