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The wrist pin let go in my stock 600 Rev a few weeks ago, so I went with Big John's small bore motor as a replacement. I had always wondered if a snappy 700 ish motor(670cc) would satisfy my needs as a mountain sled. I can honestly say this is what I have always wanted. The instant throttle response and low end grunt combined with my sled set-up makes this a perfect combination for all my needs other than Epic Deep Snow. Even in the 2-3 feet of deep snow last weekend, it was neck and neck with all the other sleds and was a pure joy to ride.
Now here's the impressive part IMHO,;
The motor was installed last wednesday with Johns recommended jetting, gearing & clutching, I scrambled to get some break in miles before the cluster-gathering of Team Talkers Saturday in Afton. Was only able to put 29 miles on, checked plugs & heat cycled/cooled the motor 4 times. Then Saturday morning pinned it WFO almost all day long the next 2 days at elevations from 7500-10,000 and made Not ONE change in jetting, the plugs are perfect and the motor never missed a beat. Our initial clutching and gearing was spot on, and only required adjusting clickers up or down. Pretty impressive for someone who lives at 500' elevation and 1200 miles from the mountains I think.
Best of all the motor LIVES!!!!!!!
I am surprised there are not more sleddars who take this option, I highly recommend this motor and of course Sled Head Racing. If you are a DOO rider and looking for high output from a small motor and instant throttle response for all around riding conditions, this is your motor!
John, thanx for all your patience and help with my endless questions, this sled absolutely screams!![Cool :cool: :cool:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Now here's the impressive part IMHO,;
The motor was installed last wednesday with Johns recommended jetting, gearing & clutching, I scrambled to get some break in miles before the cluster-gathering of Team Talkers Saturday in Afton. Was only able to put 29 miles on, checked plugs & heat cycled/cooled the motor 4 times. Then Saturday morning pinned it WFO almost all day long the next 2 days at elevations from 7500-10,000 and made Not ONE change in jetting, the plugs are perfect and the motor never missed a beat. Our initial clutching and gearing was spot on, and only required adjusting clickers up or down. Pretty impressive for someone who lives at 500' elevation and 1200 miles from the mountains I think.
Best of all the motor LIVES!!!!!!!
I am surprised there are not more sleddars who take this option, I highly recommend this motor and of course Sled Head Racing. If you are a DOO rider and looking for high output from a small motor and instant throttle response for all around riding conditions, this is your motor!
John, thanx for all your patience and help with my endless questions, this sled absolutely screams!
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