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it is about 120 hp.
 

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I have a 98 670 and I was told 117hp so its all around there somewhere.
 

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95 and 96 Mach 1's are 125 hp. Twin pipes, 44mm carbs, 501 valve, short boots. Gut the airbox, up 3 mains and raise needle one notch and your set.
 

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I've always seen them run in the 115-117 area.  I dont think they are near the 95 Mach 1 area.  They had huge carbs on them.  I think 44mm.
 

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I  doo believe that a mxz 670 is faster then a twin piped mach,
even though the mach has more power.
 

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</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (Krusty @ April 08, 2002, 5:46pm)</td></tr><tr><td id="QUOTE">95 and 96 Mach 1's are 125 hp. Twin pipes, 44mm carbs, 501 valve, short boots. Gut the airbox, up 3 mains and raise needle one notch and your set.[/b][/quote]
what will this do for me?
and will it leave me in fear of a melt-down
 

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anytime you make changes to carburation and exhaust you have to watch for burndown..but once you get it tuned in properly, you shouldn't have to worry about it again
 

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alscool, the stuff I listed, you already have. Those are the differences between the Mach and the std. 670. Gutting the box really wakes them up. If you are not familiar with jetting I would leave it stock.
 

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Hey "MR670"
670 MX-Z beating a 95 or 96 MACH 1, NOT A CHANCE!!!!!!!
I have a 96 MACH 1(stock except for gutted airbox and 1" paddle track) and I consistantly beat up on my freinds 97 MX-Z 670 and another 98. This is from a dead stop or on the lake
( even with the bigger lug track with closed windows on the track & 192 1-1/4" studs)
 
 

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</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (MOOVS @ April 10, 2002, 08:29am)</td></tr><tr><td id="QUOTE">670 MX-Z beating a 95 or 96 MACH 1, NOT A CHANCE!!!!!!!
I have a 96 MACH 1(stock except for gutted airbox and 1" paddle track) and I consistantly beat up on my freinds 97 MX-Z 670 and another 98.[/b][/quote]
allright, thats what i like to hear

so gutting the air box will necessitate the main jet changes, more air = more fuel needed?
 

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I never changed any jets at all, but I might try it.
Though the sleds usually come over jetted from the factory so maybe gutting the air box lets a little more air for the factory over jetting?

I constantly abuse the #### out of mine ( hold the throttle wide open for 2-3 min on the big lakes)
Mine has over 10,000 km's on it and never been apart!!!
 

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MOOVS, so whats the top end speed of your sled??  No speedos,  radar or gps,  be honest now. When  my 670 mxz was stock it radared at 110.3
 

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I honestly don't know? The speedo readings are always different due to snow conditions. Personally I don't think it will go 110mph, maybe between 105-110.
Last year I had a 97 MACH 1(700 triple-triple), It would only do 111 on radar. Comparing to my buddies sled my 96 is just as fast ( if not faster) to 75mph as my 97 was but the triple was faster on the top end I believe. My 97 had an all open window 3/4 lug track with 144 in it( better top end track).
 

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I also own a 95 mach 1. Bought it new. Ran it with k&n filters with no jet changes and the plugs were just fine. (wisconsin)
Yes, they are jetted rich stock because these were in such a high state of tune from the factory. If you jet too lean they will not last.
I lunched a pto crank bearing/piston from ####### around trying to get ufo's to run right. Rebuilt it and now it is completely stock. I'll probaqbly put the k&n's back on once I am comfortable that the motor is broken in after the rebuild.
I have not ridden a stock sled that pulls as hard as my 95 mach 1 up to about 80mph. Once I had the ufo's pretty close to dialed in and oh boy, did it pull hard ! (probably too hard as the bearing let go eventually!) I'll never sell this sled. Very rare. The black f body ski-doos may not handle as nimbly as recent chassis, but they are the most sinister looking sleds that ski-doo has ever come out with imo. Great lake racers.
 

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</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (robert gleason @ April 10, 2002, 11:34am)</td></tr><tr><td id="QUOTE">I'll never sell this sled. Very rare. The black f body ski-doos may not handle as nimbly as recent chassis, but they are the most sinister looking sleds that ski-doo has ever come out with imo. Great lake racers.[/b][/quote]
what is 'rare' about this sled, will it be featured on vintagesled.com in 20 years?
 
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