F7 won't go over 100 - Snowmobile Forum: Your #1 Snowmobile Forum
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post #1 of 23 (permalink) Old 01-21-2009, 03:11 PM Thread Starter
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F7 won't go over 100

I got my sled back from the shop after they fixed and adjusted my clutch and now it is alot snappyer but just like before i go it fixed, i can't get into thriple digits. i was on the lake last weekend on about 4-5inch of hardpack snow and i toped out at around 95. My sled gets there like instantly and it dosn't bog or anything, it just gets to around 90 and then crawls up. Wtf is wrong with it if it aint the clutch? i should be around 105 Help!
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post #2 of 23 (permalink) Old 01-22-2009, 05:14 AM
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What is the peak rpm at the time?
If you are over 8400, you are missing some of the set up.

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post #3 of 23 (permalink) Old 01-22-2009, 11:08 AM
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SP track? Studs? All that adds up to more rotational inertia....prolly won't see triple digits!

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post #4 of 23 (permalink) Old 01-22-2009, 08:46 PM Thread Starter
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I top out at about 7800 rpms
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post #5 of 23 (permalink) Old 01-22-2009, 09:44 PM
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I top out at about 7800 rpms
Your rpms are way to low. Sounds like an issue with the power valves. Even on looser condition you should pull 105-109 with a 1" track.
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post #6 of 23 (permalink) Old 01-22-2009, 11:59 PM
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The secondary needs to be set up right too.
If the spring is too weak for the primary clutch set up, you will not make the peak rpms needed for max hp.
You can move the spring one hole forward in the plate and that will raise the rpm at peak by 2-300 rpm and will make for better back shift too.

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post #7 of 23 (permalink) Old 01-23-2009, 06:32 AM
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Yep more tenssion on the driven will give more RPM! But alot has to be acounted for to hit 100! Are all the bearings good? Is the track just tight enough or too tight? All the way to how good are your carbides? Then conditions have to be right too! Glare ice at Zero out with a light breeze at your back will give you a big advantage!
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post #8 of 23 (permalink) Old 01-23-2009, 07:38 AM
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Your rpms are way to low. Sounds like an issue with the power valves. Even on looser condition you should pull 105-109 with a 1" track.

Disregaurd the rpms comment (had a brain cramp last night). Peak rpms are 7850 on the F7's which also means nothing wrong with your power valves.
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post #9 of 23 (permalink) Old 01-24-2009, 12:25 AM Thread Starter
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haha ya, and its got the 1.375 with studs so... lol i still should see triple digits tho?

[IMG][/IMG]
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post #10 of 23 (permalink) Old 01-24-2009, 09:11 AM
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haha ya, and its got the 1.375 with studs so... lol i still should see triple digits tho?

[IMG][/IMG]
I would assume that with that track 105 is about all it will go in prime conditions. If you want a lake racer you'll want a 1" track or less. The other thing you can do is check your shift out. You might need to gear down with that track. Take a black marker and put some vertical lines on your primary clutch. You should have nothing left or roughly 1/8". There is also some tricks to altering your helix/secondary to get a little more shift out as well. If I get a chance I will try to find the link that explains the secondary clutch trick (assuming you have a 03-04 F7 with a roller secondary).
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post #11 of 23 (permalink) Old 01-24-2009, 10:08 PM Thread Starter
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no i got an 2005 with the dimond drive and that good stuff

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post #12 of 23 (permalink) Old 01-26-2009, 08:44 AM
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Maybe it's that loud aftermarket can you have....they are known to rob HP!!

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post #13 of 23 (permalink) Old 01-26-2009, 09:31 AM
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I know, it needs more stickers on it, you know that the right ones actually add up to 10 hp.

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post #14 of 23 (permalink) Old 01-26-2009, 10:03 AM
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Is it EFI or Carb?

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post #15 of 23 (permalink) Old 01-26-2009, 02:27 PM Thread Starter
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It's EFI with no mods under the hood, i want a can but the fine costs as much as the can does haha one day tho
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post #16 of 23 (permalink) Old 02-02-2009, 12:29 PM
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actually my uncle put his sled on a dyno and got about half a horsepower out of the can..... And my dad has the identical sled like yours and it will oply do about 95 too and my 03 does 110
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post #17 of 23 (permalink) Old 02-02-2009, 07:17 PM Thread Starter
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y tho??
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post #18 of 23 (permalink) Old 02-03-2009, 07:43 AM
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The 03 Is the fastest F7! The diamond drive is slower and I dont understand why either! Maybe it's just gearing????
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post #19 of 23 (permalink) Old 02-03-2009, 11:40 AM
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haha ya, and its got the 1.375 with studs so... lol i still should see triple digits tho?]
You answered your own question....you want top speed, get a 1" track w/o studs!!

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post #20 of 23 (permalink) Old 02-03-2009, 12:01 PM
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+1 I put a 1.25" ripsaw on my 700 MXZ and lost a good 10km/h top end from the stock track. Its not studded either. I could only imagine what another 0.125" and studs would do. If you can get to 100mph you shoudl be plenty happy! Hell getting there is all the fun anyways and you should do that real quick now!

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