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

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Old 01-11-2009, 06:55 PM   #1
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Hello,

I picked up a 2004 firecat f7 EFI this year. I have not been able to ride it till now. I was told that the F7 is a fast machine. The problem is that it runs kind of funny and has a maximum of only 6500 rpm. It seems to run fine when accelerating but awfully slow. I have a 2000 arctic cat 600 efi powder sled and it murders this firecat, and also my 2004 yamaha viper 700 just kills this thing.

The snowmobile idles at about 1200-1800 rpm sometimes dies

I have taken off the power valves and cleaned them, the valve cases were full of gasoline and oil after running the snowmobile, When I pulled them out of the ports the gasoline mixed with oil just spilled out on the engine. not sure if this is normal. The cables on the servo measure around 1 1/4 inch both cables and are same lenght. When I pulled on the valves cables they moved freely. The spring works fine.

The snowmobile has very poor throttle response, and hits a maximum of 6500 rpm, usually stays at 6200 at WOT. Does not scream like the other sleds. and doesn't go faster than 40 some miles per hour.

When the engine is running it doesn't sound as smooth as my 2000 600 efi arctic cat.

The engine light is not on.

I checked the clutches and they engage fine, they also look like they are in good condition.

Starts up no problem on first or secon pull.

Not sure what the problem is but if you guys could let me know what to diagnose and check, I would greatly appreciate it.

Thank you
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Old 01-11-2009, 08:17 PM   #2
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check your cylinders
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Old 01-11-2009, 09:36 PM   #3
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<div class='quotetop'>QUOTE (catman9 @ Jan 11 2009, 07:17 PM) <{POST_SNAPBACK}></div>
 Quote:
check your cylinders[/b]
Hello,

I have about 140-144 psi on each cylinder. Seems to run alright when your riding it. I tried starting the snowmobile with just one spark plug connected, I tried that on both cylinders, but it wouldn't start, also tried running it and taking of one spark plug wire off and it would die instanly. Maybe weak spark? I have a spare efi ingnition coil from a 2000 arctic cat 600 efi looks the same as the f7 coil except the connector is different, but the wire is still orange and black, would this coil pack work on the f7 just to try if it would run better? Could is be the stator going out? Seems like these firecats have lots of issues compared to the yamahas. I have been riding my sx viper 700 for 4500 miles now and not a single problem. i bought this firecat f7 for my brother but it doesn't run right.
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Old 01-11-2009, 09:45 PM   #4
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injectors and fuel system all clean?
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Old 01-11-2009, 10:02 PM   #5
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<div class='quotetop'>QUOTE (kick-er @ Jan 11 2009, 08:45 PM) <{POST_SNAPBACK}></div>
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injectors and fuel system all clean?[/b]
Hello,

Fresh gas in it, have not cleaned the injectors yet, will have to look at them.
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Old 01-12-2009, 09:33 AM   #6
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Hi,


Why is the snowmobile only running to 6500 rpm maximum? it gets to 6500 everytime you open up the throttle same everytime

Thanks
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