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are you running any of the zero weight multi viscosity oils? (low oil pressure at idle that is ok when revving the motor)

Put the transfer rod back in. Without that piece, your rear suspension arm will fold forward and jam between your rails and cause what you are now experiencing.

That is a common failure for stock exhaust that have seen several seasons of hard use. It can't be welded (reliably) because the design is a slip fit of the y section into the larger single pipe section, and your crack is now essentially a butt joint. It will not be robust enough after...

Added a first gen Heelclicker clutch kit and an Excel exhaust to my 2006 MPI Apex.

Here is another way to look at the analysis of short track vs. long track, in terms of top speed. Generally speaking, the easiest way to attack a complex problem, is to reduce the problem to absurdly simple terms. Then, the answer becomes trivial. Imagine two scenarios, one sled with an...

I also have an MPI supercharger (2006 Apex) that runs 7 psi on 93 octane, stock compression. It has very linear power and instantaneous response. Response is so intense that it will shoot you off the trail in a corner if you bump the throttle inadvertantly. With a 128 cobra track, its...

Vehicle speed is limited by a few things, like hp, vehicle aerodymanic coefficient, surface conditions, etc. But, drive train speed is also a limitation. Internal combustion engines only make usable power with lots of rpm, basically stringing together hundreds of power pulses each second...

If you read the MSA article this month, there is one statement in there that is the foundation for this action. The author could not help himself but to be honest about the subject, but at the same time, did not want to usher in an apocalypse. He wrote "Sign it like a freeway, and people...

The Cobra costed me 6 mph on the speedo, 115 vs 109. But, it does hook up with authority. If you decide to cut it down, build a simple template/fence to set next to the lug and use an electric carving knife to slice through the lugs. I think that going down to 1 inch will net top end, but...

I had a 128 cobra with 100 studs and pulled 127 on the speedo down a plowed road and got out of the throttle a little early. I'm sure it would have broke 130 if I stayed in it. I'm running 7.5 psi with stock compression. Any snow cover at all, like what you may have had on the lake, will...

The M10s and 20s are nice for trail smoothness, but I find that if I stay in the motel and watch TV, instead of actually riding, I have the most comfort possible. In all seriousness, those suspensions do not transfer weight, so fast starts are non existent, and on top due to their extra...

Top Fuelers running under 5 seconds and over 330 mph in the 1/4 mile, use these belts to run their blowers. A 2000 hp top fueler uses 450 hp to run the blower. If they can support that, they can run our snow machines. These poly belts are a great performance adder over a chain and...

0W40 is too thin, especially for boost. That oil will get dangerously thin as the boosted motor gets hot, and if you're unlucky you'll spin a rod bearing as a result. I run Shell Rotella full synthetic 10W40 in all my toys. My ZX10R race bike has thousands of track day miles on it and the...

Everything is relative,,,,1/2 mile can be a very short distance and a very long distance, all dependent upon your point of view. A 1/2 mile feels very short as you cruise at speed along your favorite stretch of trail. On the other hand, if you had to PUSH your broken down sled 1/2 mile...

Front and rear exhaust driven boost are not your only options! Go SC and avoid all those clutching and exhaust manifold problems. There is nothing in the world like SC'd boost right off idle, especially with the stock (high) compression. Response is almost too abrupt; accidently bump the...

Will be there Wed around 9pm, staying at the Alger Falls with my buddy Jim Peterson.

Thanks for all the replies. For a topic like this with so many previous threads, I am appreciative of the offer from so many to help. But, I think I didn't make my point, given so many ideas for remedy. I was not asking for advice. The sled that I am talking about has a loose track, ski...

Sitting here at my desk, I find myself reflecting on the way this Midwest winter is playing out, and how in two weekends, I have blasted my slides down to the wear lines, in spite of the fact that the other sleds I shared the trail with are pratically unaffected. The first weekend I managed...

Snowmobiles suffer badly from rotational losses in the track and skid. Like a PWC, it takes HUGE increases in power to add significant top speed. So, if the more powerful sled gives up a little at launch due to traction issues, it is difficult to recover before both sleds fall victum to the...

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