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

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Old 11-08-2010, 07:47 PM   #1
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Sled: 2004 F7 NIGHTFIRE SNOPRO
10-11 Mileage:
09-10 Mileage: 1000
08-09 Mileage: 800
07-08 Mileage: 250
06-07 Mileage: 250
compression??

Hey guys, looking for a little input. I have an 04 F7 with 5000miles. Just spent a bunch of $ on it to freshin it up. I did a compression test on it, pull 120psi per side. Is that in spec? Sled is stock ( for now). I want to add some go-fast parts to it but not if the motor won't handle the extra hp. Thoughts???

P.S. motor is original and never been touched.
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Old 11-08-2010, 07:53 PM   #2
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08-09 Mileage: 1050
07-08 Mileage: 1850
06-07 Mileage: 950
I believe it should be around 140 ish. Could be wrong. My 05 F7 was 145
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Old 11-08-2010, 09:00 PM   #3
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try another gauge they can read quite a bit different!
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Old 11-08-2010, 09:06 PM   #4
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Yeah, definitely try a different gauge, my 05 has about the same mileage on the stock parts and I had 138 and 137 in each.
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Old 11-08-2010, 09:13 PM   #5
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 Quote: Originally Posted by DARK HORSE View Post
Hey guys, looking for a little input. I have an 04 F7 with 5000miles. Just spent a bunch of $ on it to freshin it up. I did a compression test on it, pull 120psi per side. Is that in spec? Sled is stock ( for now). I want to add some go-fast parts to it but not if the motor won't handle the extra hp. Thoughts???

P.S. motor is original and never been touched.

Maybe I'm reading your post wrong?
You first said that you spent a bunch of $ freshening it up, but then you go on to say that it's never been touched?
If it was freshened, it's been touched in my book.
Not looking to bust stones, just think you'll get better replies if things are a bit clearer.
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Old 11-09-2010, 12:37 AM   #6
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 Quote: Originally Posted by raceguy View Post
Maybe I'm reading your post wrong?
You first said that you spent a bunch of $ freshening it up, but then you go on to say that it's never been touched?
If it was freshened, it's been touched in my book.
Not looking to bust stones, just think you'll get better replies if things are a bit clearer.
i agree, does that mean motors been rebuilt or what? I just rebuilt mine and I got 120 on one side and 130 on the other. Im hoping theyll even out once its been ran a lot and its broken in. That could be your issue too if its been rebuilt
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Old 11-09-2010, 08:33 PM   #7
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Sled: 2004 F7 NIGHTFIRE SNOPRO
10-11 Mileage:
09-10 Mileage: 1000
08-09 Mileage: 800
07-08 Mileage: 250
06-07 Mileage: 250
Sorry for the confusion guys. I powder coated the front and rear suspension, recharged all shocks, jack/drive shaft bearings and new track. I guess I used the wrong word there. Motor hasn't been touched. The gauge I was using was a old push in type, not the screw in type like I would of liked to use but its what was on hand. Assuming is was right, rebuild time? Sled ran great last year. I'm going to check it again with a different gauge.
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Old 11-10-2010, 05:51 AM   #8
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My 04 f7 has 8000 miles on it and it is 138 on both sides, even. I check it every year.
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Old 11-10-2010, 06:30 AM   #9
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How was the compression checked..engine up to operating temp or cold? Did you hold the throttle open when you pulled it over? Those will effect the compression. The over all number sounds a little low but not extremely low for a machine with 5k miles. Are both cylninders the same number? If not then I'd rebuild it...if they both are at 120 then i'd run it!
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Old 11-10-2010, 05:41 PM   #10
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Sled: 2004 F7 NIGHTFIRE SNOPRO
10-11 Mileage:
09-10 Mileage: 1000
08-09 Mileage: 800
07-08 Mileage: 250
06-07 Mileage: 250
Engine was cold, throttle closed and both sides equal. Haven't got a chance to try another tester yet, hopefully on weekend.
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