F7 Big Bore help and opinions NEEDED! - HCS Snowmobile Forums

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Old 06-13-2016, 09:54 PM   #1 (permalink)
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Default F7 Big Bore help and opinions NEEDED!

Ok so here's my situation I bought a 2004 f7 at the end of the winter for cheap I've got a crossfire chassis to but the f7 in. The f7 has never been rebuilt but has a ridiculous amount of kms on it. Plan was to replace pistons and have cylinders re nickeled if needed and add pipes and such for horsepower gain. After looking at RK Tek big bore kit that looks like a better road to take a little more pricy but tons of power and reliable. Any feedback on these kits? Any that are better then others or should I stay away from big bores? Any help and opinions are greatly appreciated thanks guys
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Old 06-14-2016, 08:05 PM   #2 (permalink)
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Do a search a lot has been written on the Big Bore F7 kits. Remember the 05 800 Mod was based ALL OFF A F7 MOTOR. It is a F7 motor that has been bore to a 800 with a big exh port and 2 shims gaskets. Now that also had a hot ECU and high Comp ratio with a head that was cut for short full throttle runs.
SO do the search. see what they have to say and make a choice.
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Old 07-04-2016, 09:20 PM   #3 (permalink)
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D&D racing has 800 big bores on sale.for only $895 for Cylinders and head.
Use to be a $3000 kit.
Wicked deal.
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Old 07-04-2016, 11:14 PM   #4 (permalink)
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And it's a heck of a good kit.
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Old 08-03-2016, 10:50 AM   #5 (permalink)
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I got 164 HP out of my big bore F7 and thats after dyno tuning, personally refresh your engine with stock 700 specs and kick ass, the F7 is fast enough as is. Unless your lake racing all day. Leave it stock.
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Old 08-03-2016, 12:57 PM   #6 (permalink)
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Agreed on D&D products, Awesome Products and great people to work with!
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