2011 F8 HO upgrades and mods help - ArcticChat.com - Arctic Cat Forum

F Chassis 2007- ?? Also known as the Twin Spar chassis.

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Old 01-28-2017, 09:32 AM   #1
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2011 F8 HO upgrades and mods help

Bought this year a used 2011 F8. Only 3800 miles. Went through it and upgraded the DD bearing, fixed the starter issue and swapped the front spring to the Arctic cat red spring. Going to finish the year as is and then over summer I am going to make my own plowman mount as no one makes them anymore and also add the shift assist bearing. I'd like to get a little more out of it without having to tune it. What can all be done without a tuner and maintain reliability?

I've heard to also swap to 74 gram weights in the clutch.

Muffler seems like a good gain and weight loss but don't want to be to loud?

What has everyone done and how much can I get away with without a tuner and still run 91?
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Old 01-29-2017, 08:41 AM   #2
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On our 2010 F8 HO I went through the clutchs and rebuilt both clutchs with new bushings (primary) and the Formula X1 secondary mod so you can change the big bushing in the back of the secondary and I am still using stock helix. Then put a new yellow/white primary spring in and a set of adjustable Daltons weights and installed a new orange secondary spring with shift assist and removed one of the black rubber spacers. I'm up to 76 grams of clutch weight and It is night and day difference from last year. As is it will hang with my boosted turbo to 95 mph. I needed to add more weight yet but now I am rebuilding the engine thanks to some idiot who turned down the oil pump before I bought it.
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Old 01-30-2017, 08:14 AM   #3
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 Quote: Originally Posted by Zrt1200 View Post
On our 2010 F8 HO I went through the clutchs and rebuilt both clutchs with new bushings (primary) and the Formula X1 secondary mod so you can change the big bushing in the back of the secondary and I am still using stock helix. Then put a new yellow/white primary spring in and a set of adjustable Daltons weights and installed a new orange secondary spring with shift assist and removed one of the black rubber spacers. I'm up to 76 grams of clutch weight and It is night and day difference from last year. As is it will hang with my boosted turbo to 95 mph. I needed to add more weight yet but now I am rebuilding the engine thanks to some idiot who turned down the oil pump before I bought it.
Thanks, Yes i saw your post on the motor that sucks!! I will be watching that thread. Do you have anyhting else done to the sled or no?

I have thought about replacing the secondary spring and might as well if I'm going to be in there. Did you replace the roller in the secondary at all, I see BDX has what looks like an upgrade in there "rock" rollers.

We haven't had good snow on the lakes yet and I've only seen mine up to 102 on the gauge but I lost pretty good to my buddies 800 Skidont.

I'm thinking the plowman and come of this other maintenance should be a good boost in being able to transfer the power.
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Old 02-04-2017, 09:53 AM   #4
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 Quote: Originally Posted by mechanicalmike08 View Post
Thanks, Yes i saw your post on the motor that sucks!! I will be watching that thread. Do you have anyhting else done to the sled or no?

I have thought about replacing the secondary spring and might as well if I'm going to be in there. Did you replace the roller in the secondary at all, I see BDX has what looks like an upgrade in there "rock" rollers.

We haven't had good snow on the lakes yet and I've only seen mine up to 102 on the gauge but I lost pretty good to my buddies 800 Skidont.

I'm thinking the plowman and come of this other maintenance should be a good boost in being able to transfer the power.
When I bought our F8 last year I had the dealer check the VIN numbers for any updates. He asked if it had E-start and I told him no. He said thats good as that E-start had a lot of problems in those chassis on the F8 HO. I hope you dont run into any of those issues.

Yes I went with the BDX rock rollers. I got them cheap some where but don't remember now. Oh wait a minute. I got them from Thunder products and I also installed one of there Glide washers in the primary clutch and got all my clutch bushings to rebuild the primary clutch from them.

https://thunderproducts.com/brand/arctic-cat/page/2/

If I can find a used D&D LTS head mod head cheap I might put that, a 2 degree key & a D&D y-pipe in it before finishing the rebuild. I am waiting on a part that back ordered till the 22nd on that sled. The combo of those parts are worth about 10HP bumping it up to the low 170's HP. If you go to D&D web site they have whats called a riot kit for the newer 800's with a can and clutching. On the 2010 & 2011 you dont need a the can. With that set up you dont need a fuel controller either and is one of the reason I am looking around for it. That and like all sledders I am Greedy in the HP department. lol

These motor mounts are very soft and a Plowman mount is a good idea to install IMO.

With the 2011 there was a ECU update make sure that got done. Have your VIN numbers checked to find out. Here is the link on Arctic Insider that talks about the reflash..

ArcticInsider - 2011 Arctic Cat 800 Reflash: The Fix is in for Ethanol
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Last edited by Zrt1200; 02-04-2017 at 10:00 AM.
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Old 02-17-2017, 10:39 AM   #5
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Won't find a Plowman mount. Stopped making them. ZR Sled Head on here had good results with just changing the primary weights to the 74 as you mentioned. Leave all other parts stock.
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