I've got an 07 M8 SP EFI stock besides an MBRP can. Engagement is @ 3400 RPM, WOT is 7950 RPM, 75 g weights, white or tan drive spring (don't know exactly, bought the machine used), RKTek secondary clutch kit with 38/36 helix, SP Green secondary spring running at 1000' elevation. I know this sled wasn't designed for flatland drag racing, but that's what I was doing today with an F8 stock, F7 slightly modded and an MXZ600. When it ran good I took all off the line and to the 660' mark. Most of the time though it bogged and stuttered when I goosed it. If I held the brake and idled up to 4200 RPM it ran great. My question is how do I get rid of the bog? Do I raise the engagement via spring or weights or do I delve into the world of fuel controlling?
Help with curing a bog off of idle
- Thread starter ff92
- Start date
I hoped I wouldn't hear that. I'll try it. What I really need to know is how can I keep everything the same yet gain engagement rpm. I've considered getting 77g weights and grinding a flat spot on the heel to net 75 g, yet have more rpm at takeoff. Does this sound feasible?
What would be the next color spring from Arctic Cat that slows engagement a bit? thats what you would want right a little stiffer spring? I have the same problem every once in a while with my stock snowmobile except my MBRP can.
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Thanks for the insight guys. I'll look for a different spring, the Cat Orange/White looks like it might have the numbers I need (143/290). Anybody have one they would part with?
if you can find one they work great, I have heard they were replaced with the Orange black and they suck
Called the dealer today, says Orange/white is discontinued, replaced with Black/orange with identical rates 143/290. Any problems with the blk/orng?
YES! Blk/Orn are the ones that are breaking. Get the Yellow/White, tad lower engagement (maybe 100rpms) and same finish rate. Get a set of Thunder Products glide washers and install when you replace also. That will put the engagement up 100rpms with the 2 glide washers, they also give you 3 more washers to install in desired which will bump up engagement rpms 50rpms per washer.
Thanks for the info guys. Funny how the dealer wouldn't advise about the breakage possibility, and sell them anyway. That's why I come here first, contributors on the boards have tons more knowledge and info than most dealers.
Get a Speedworx Green/white it will work perfect. Its about 10lbs heavier off bottom and 5lbs on top. Are you running 87 oct fuel. If your not you should, the way the motor is built it will run better on 87. maybe even more power.
I buy Premium, but who knows for sure what the hell is in it, I think it's advertised as 89. That's funny, the Speedwerx Grn/Wht H5 was on my shortlist but at $40 US plus cross border shipping I didn't want to pay $80 for a spring.
I don't care for the slp blue/pink, I might try a different combination but not impressed with it so far.
A local dealer can't get you one for less? I paid $44 out the door from my dealer.
A local dealer can't get you one for less? I paid $44 out the door from my dealer.
S
skimike
Member
I order everything on line from dirtcheap.com, they will smoke your dealer price and they have free shipping over 50 bucks, I only paid around 20 bucks for springs, Its funny I get slp parts cheaper from them than I can from slp direct. my can was 30 dollars cheaper from dirt cheap
carefull with the slp springs i think they have some great rates that fill a gap in cat spring lineup but i've got two slp springs that are a little larger o.d than the cat springs. they fit too tight in the spring cup in my opinion exacerbating the binding issue. glide washers are good but i would put a max of two (you only need one end to spin to not bind) or you may not get the primary to shift all the way. i have good luck with the yellow white spring 3800-3900 engagement no bog.
87 octane could take care of the bog. 87 explodes faster and burns hotter giving you more up and go, 91 burns slower it just has a higher compression to detonation rate. with just a can you are loosing running anything higher than 87.
Think of it like a diesel, say diesel is 60 octane and blows up under compression only, and you get massive low end torque. AC built the compression rates of these motors to run on 87 for best performance and until you add power to increase the rate of compression you don't need 91.
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Does anyone know where I could buy the OEM Arctic Cat Springs? I need the Orange/White primary spring and the white ACT driven spring?
B
Burn Down
Well-known member
Need to reread the posts above. You can't get the orange-white anymore it is discontinued, orange-black is what replaces it but it is known to break. I think alot of the folks on here use Product Tester for OEM parts might try shooting a pm.
I have a yellow-white engagement is 3800-3900 silky smooth, no bog or stutter, but has a ton of mods.
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