2004 Firecat F-7 EFI Sno Pro....Performance Issues? - HCS Snowmobile Forums

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Old 03-23-2009, 06:36 PM   #1 (permalink)
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I have a 2004 Arctic Cat Firecat F-7 EFI Sno Pro that I am having performance issue with. I have a Speedwerx pipe, Speedwerx Clutch kit, Speedwerx head, V-Force reeds, and 153 studs in the Sno Pro track.

Here is my problem.....It runs great up to 80 MPH, then it falls flat on its face....Top speed is 92-93MPH. I'm losing races on the top end. My sled runs great, is it possible that my track (Sno Pro) is eating that much off of my MPH? I am very dissapointed with my top end.

Any suggestions?

Thanks!
Karl (KZR800)
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Old 03-23-2009, 06:48 PM   #2 (permalink)
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Sounds like you fucked up the clutching you sure you have the right kit for that setup. You probably need an EFI controller box too cuz with that setup your not getting the right amount of fuel without a way to manage it.
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Old 03-23-2009, 07:10 PM   #3 (permalink)
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Quote:
I have a 2004 Arctic Cat Firecat F-7 EFI Sno Pro that I am having performance issue with. I have a Speedwerx pipe, Speedwerx Clutch kit, Speedwerx head, V-Force reeds, and 153 studs in the Sno Pro track.

Here is my problem.....It runs great up to 80 MPH, then it falls flat on its face....Top speed is 92-93MPH. I'm losing races on the top end. My sled runs great, is it possible that my track (Sno Pro) is eating that much off of my MPH? I am very dissapointed with my top end.

Any suggestions?

Thanks!
Karl (KZR800)[/b]
what were the conditions like? did you look at your clutches to see how far the belt is climbing the primary? i know the speedwerx weight's do not have alot of tip weight and there clutch kits are designed sort of like sno-cross clutching.
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Old 03-23-2009, 10:38 PM   #4 (permalink)
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My O2, its probably in the clutching. You don't need a boondocker for the mods you have. I forget which one, primary or secondary, but draw a marker line from top to bottom and ride it. Then check and make sure the whole marker line disappeared. If it didn't, then clutching is probably off. What belt are you using?? Should use an 020 for best results. Not sure if you did it or not, but I adjusted my oil pump before I did the Big Bore when it was basically stock and that made a big difference. It could be running pig rich upstairs at WOT. I was disappointed with my top speed too when my sled stock. The sno-pro track and studs will slow you down a bit versus a standard, but you should still break the 100 mark.
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Old 03-24-2009, 08:33 AM   #5 (permalink)
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My O2, its probably in the clutching. You don't need a boondocker for the mods you have. I forget which one, primary or secondary, but draw a marker line from top to bottom and ride it. Then check and make sure the whole marker line disappeared. If it didn't, then clutching is probably off. What belt are you using?? Should use an 020 for best results. Not sure if you did it or not, but I adjusted my oil pump before I did the Big Bore when it was basically stock and that made a big difference. It could be running pig rich upstairs at WOT. I was disappointed with my top speed too when my sled stock. The sno-pro track and studs will slow you down a bit versus a standard, but you should still break the 100 mark.[/b]

I checked my clutches before my last ride and all was good. Alignment and deflection were good, and I'm pulling my belt all the way. I am running the 031 belt....Is there an advantage of running the 020? My Speedwerx pipe is supposed to run at 7800 - 7900 RPMS....I pull that too. However, I am hitting 7800 - 7900 RPMS at about 80 MPH, then it is a slow crawl from there?
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Old 03-24-2009, 11:26 AM   #6 (permalink)
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I checked my clutches before my last ride and all was good. Alignment and deflection were good, and I'm pulling my belt all the way. I am running the 031 belt....Is there an advantage of running the 020? My Speedwerx pipe is supposed to run at 7800 - 7900 RPMS....I pull that too. However, I am hitting 7800 - 7900 RPMS at about 80 MPH, then it is a slow crawl from there?[/b]
Is the primary spring a titanuim one, if so I've seen acouple of these bind & make it very slow to upshift after that. Also remove the springs from your clutches and put them back together w/out the springs and look for any small binding in them.
The 020 belt grabs better in the clutches, than the 031 is hard and better for high milage riding.

020 will take less primary weight to acheve the same clutching results.

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Old 03-24-2009, 12:30 PM   #7 (permalink)
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020 belt is softer so it may help. You should be fine with a 031 all depends on what belt speedwerx uses as their belt on the sled they did the testing on with the 04's. At WOT the sled is pulling 7800, what happens if you let off the throttle a little bit? If the sled should gain speed then you need more weight, check this first. Also could have a spring bind issue. Put the stock primary spring back in and see what happens. Top end with the SP track should be 10-12mph faster up top then what you are currently seeing.

If all else fails post on arctic chat, Jeremy Houle from speedwerx is on the site.
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Old 03-24-2009, 09:46 PM   #8 (permalink)
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ive had my 06 f7 sno pro efi 105 on the lake and i figured that was good enought for me so i let off. do you guys think i should be getting alittle more or what.

good luck with your problem man.
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Old 03-24-2009, 10:09 PM   #9 (permalink)
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I'm so pissed off about this piss poor performance....i thought F-7's were fast!?! Now I have to wait until it snows again....In the fall, to even test these options.

I believe I have a two fold problem. The first is the Sno Pro track. The second is the clutching on my sled. I have checked it twice. I called Speedwerx and gave them a run down on the clutch, and John verified that it is the right clutch kit for my sled (Pipe and head mod)? I'm thinking about trying a different clutch kit.

Question: Should I try an ODS clutch kit (I have read good things about it), or do I try cutsom clutching?
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Old 03-25-2009, 04:56 AM   #10 (permalink)
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Quote:
I'm so pissed off about this piss poor performance....i thought F-7's were fast!?! Now I have to wait until it snows again....In the fall, to even test these options.

I believe I have a two fold problem. The first is the Sno Pro track. The second is the clutching on my sled. I have checked it twice. I called Speedwerx and gave them a run down on the clutch, and John verified that it is the right clutch kit for my sled (Pipe and head mod)? I'm thinking about trying a different clutch kit.

Question: Should I try an ODS clutch kit (I have read good things about it), or do I try cutsom clutching?[/b]
how did it work with the stock clutching?
it sounds like a clutching issue... im guessing they cut the head for more compression? how much compression are you running?
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