121 to 136 - HCS Snowmobile Forums

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Old 02-27-2011, 11:18 AM   #1 (permalink)
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Default 121 to 136

going to turn my 121 apex into a 136, what do i need, do I need to trade my er rear cooler for an attack one? thanks.
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Old 02-27-2011, 01:41 PM   #2 (permalink)
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Join Date: Oct 2006
Posts: 1,048
Current Sled(s): 800 Switchback Pro S & 78 ET 340
Previous Sled(s): Attak gt,APEX RTX ,SRX 700, XLT 600, Ski Whiz 440
Location: Salt Springs Nova Scotia
Favorite Riding Area: Cape Breton Highlands
14-15 Mileage: 2500
13-14 Mileage: 1800
Age: 47
Riding Since: 1976

I streathed mine and used 2 6 inch long pieces of aluminium pipe to allow for the extra length. It would look better with the right cooler but that's all I did to make it work. You'll never own a short track again, it's a wicked upgrade. Make sure the extention kit you get allows for the longer hyfax, some keep the regular hyfax and I wouldn't reccomend them.
72 Moto Ski; 72 Yamaha GP 292;74 Ski Whiz 76 STX 340 82 Yamaha Exell 3; 96 Indy 340 95 Polaris XLT 60001 Yamaha SRX700; 06 Yamaha APEX RTX 07 Yamaha Attak GT;16 Polaris Switchback 800Pro s
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Old 02-27-2011, 08:25 PM   #3 (permalink)
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thanks duste. i'm into a major overhall including engine work. i think an attack cooler would be the way to go.
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Old 03-07-2011, 07:17 AM   #4 (permalink)
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Join Date: Apr 2007
Posts: 144
Current Sled(s): 2012 XF1100 Turbo, 2011 Ace Renegade (Son's S
Previous Sled(s): 08 Apex GT, 91 Phazer II, 88 Sno Scoot, 82 ET300
Location: CBS, NL. Canada
Favorite Riding Area: Central Newfoundland
Age: 44
Riding Since: 1972

I used muffinworks kit to stretch mine to 144. Best thing I have ever done. A friend also did his to 136 and he is happy....not as happyas me but happy.
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Old 03-10-2011, 06:24 PM   #5 (permalink)
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Join Date: Nov 2009
Posts: 6
Current Sled(s): 2008 Yamaha Apex GT LTX
Riding Since: 1978

Helped my buddy do his extension kit and it was a breeze. We never had to touch the coolant system at all
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Old 03-10-2011, 07:06 PM   #6 (permalink)
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Posts: 38

I like to have something back there. if i can't score a cooler i might go with the alunium pipe. thanks all.
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Old 03-14-2011, 02:03 AM   #7 (permalink)
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Join Date: Mar 2011
Posts: 436
Current Sled(s): 2013 xf 1100 turbo high country
Previous Sled(s): 2001 yamaha sxr 500. 2006 apex rtx 144"
Location: East bethel mn
Favorite Riding Area: anka/isnti, n shore, st croix
Age: 28
Riding Since: 1989

Stretched mine to 144 tip up from muffinworks. The hardest part was putting the new track on. No coolent issues with stock.

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