XFR/Firecat/Sabercat Regular 128" XF / Firecat/Sabercat chassis

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Old 01-12-2011, 10:17 PM   #1
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Sled: 2005 F7 Sno Pro EFI
2005 F7 Sno Pro EFI Max RPM

Took my F7 out for the first time last w/e. Night and day over my old Yamaha. The sled ran great, but I could only pull 7500 max rpm. It ran good up to the 7500 no bog or miss. It is stock other than Boyesen Reeds, Orange Primary Spring, Green Secondary Spring & 78gr Dalton weights. I need some help on some things to look at.
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Old 01-12-2011, 11:51 PM   #2
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check your secondary clutch,the moveable sheave bushing ,there known to cause that problem,check the belt deflection,and try a new belt
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Old 01-13-2011, 07:23 AM   #3
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you confirmed my thoughts on the secondary. Is the deflection spec 1"-1-1/2"? what's the best way to check that? Is the cat belt, the best one to use?
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Old 01-13-2011, 07:31 AM   #4
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78 gram weights are a tad too heavy for a stock engine.
Those weights go along with a y-pipe upgrade and a stealth pipe, at least that's what I run with my set-up and I pull 7800-7900 rmps .
Stock weights would probably be a better choice (75????)
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Old 01-13-2011, 08:01 AM   #5
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Sled: 2005 F7 Sno Pro EFI
Yeah, the guy I bought it from had a D&D Y Pipe and pipe mod. I think I will get the D&D Y Pipe and the BMP Pipe Mod. I think I'll be back in the game again after that. I may pull the secondary to look it over. What's the deflection spec and best way to check it?
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