These shots really show the differences in the boots as they enter the box. You can also see the air horn effect on the carb opening.
The only other modifications to the carbs were to the slides.
I have found that Ski-Doo's with primer start are extremely fat on the low end. To offset that, I turn the slides from a 2.5 side cut, into a 3.5 side cut. This leans it out about perfect for me.
It is kind of hard to see in the picture. The slide in the foreground is the stock 2.5. The slide behind is the one I altered to a 3.5.
The next modification that needed to be made was to move the handlebars forward and up higher.
I cut 2.5" out of the stock steering post. I then machined a solid piece of metal to fit inside the pipe. I then drilled holes in the top and bottom of the pieces and welded in the holes to the inside piece. I then ground a V into both pieces and TIG'd the whole thing in three passes. This should provide sufficient support for any "hard landings".
The first shot is the stock set up. The next two show the Articulating Riser and the TAG Metals aluminum handle bars.
Here is a shot of the completed steering post and bars with Powermad handguards.
Now that the sled is all together, it is time to head to the dyno room to find out where the power band was, and make sure the jetting/clutching is correct.
Scott Minzenmeyer of Recreational Motorsports here in Cedar Rapids, Iowa (who can be found on Internet at http://www.recmotor.com/) was instrumental in the engine work on ALL my sleds. I do my own port work, and I trust NO ONE else to do my machine work. His work is impeccable, and knows how to get things done correctly.
He is also extremely helpful with performance work. I could not have completed this project, (or Madness) without his insight, expertise and knowledge.
Here is a shot of the machine room at Recreational Motorsports. He specializes in 120 Mini-Sleds. He also builds mini-tractor motors and all small motors. In addition, he is one of 3 machine shops to inspect and build Legend Car motors.
You can go to his shop at anytime and see anything from snowmobile motor powered rail dragsters to custom 120 Mini-Mountain sleds to high performance boat motors. His walls are full of pictures from grateful racers that he has done machine work for. The man does it all...and does it all EXTREMELY well.
I can't say "Thank You" enough to Scott and his crew.
This is a shot of the dyno room at Recreational Motorsports. It is sound proofed and has a window to watch the motor from without being in the room.
It has an exhaust fan to draw out the fumes. You can also open a window from the outside to drop the temps. If that is not cold enough, he can also turn on the A/C and really drop the temps.
We ran the motor at a RAD (Relative Air Density) of 94.69. The air temp in the room was around 50 degrees, the humidity was around 30%, and Barometric Pressure was 28.56hg and the Vapor Pressure was 0.158hg.
Not an optimal day, but not a poor day either.
This is a shot of the control station for the dyno. This dyno uses a water break for the results.
There is a lever that attaches to the throttle linkage and you can control everything from this station.
After each pull, you can lay the graphs together to see the differing results.
Here the sled hooked and ready to roll.
Everything is set, the exhaust fan is on, the water is set, the window open, the sound door closed and ready for the first pull.
After breaking the motor in at Derby Week in Wisconsin last year, I took plug readings and piston wash. I then made jetting changes before heading to the dyno room.
Scott did an initial pull to set the system up. We then checked over all the equipment and went to the hard pull.
First pull out of the shoot netted a 130.4HP and 90 foot/lbs of torque.
We shut it down and pulled the plugs. I checked the plugs, and Scott checked for piston wash. Then Scott looked over the plugs and we agreed that they looked pretty good where they were.
We did another pull to back it up. The pull was virtually identical.
I had the timing retarded about .009" to break in the motor. I bumped the timing back up to 0.076", and we did another pull.
This pull came in at 132.7HP and 92.8 foot/lbs of torque.
We pulled the plugs and checked the piston wash. Everything was extremely good. The plugs and wash were reading a very safe margin. I would rather lose a couple of HP, than run the motor on the ragged edge. Could we have gotten to 135hp, quite possibly; however, it would have been at the expense of reliability.
We then ran another, and pretty much duplicated the last run. I got everything I needed to set up my clutching, and the jetting is just where I want it.
Below is a shot of Scott compiling the information to download the graph. Also, there is a shot of the graph that was printed out.
I airbrushed the hood in Tru-Fire with a skull comming from the flames, and a hand holding the BRP logo from the fire.
My buddy Howler made all the decals for the sled. He can make some killer graphics to fit about any style of sled. I took all the factory decals off the hood, trailing arm and rear suspension. He cut all the new hood decals, the SICKNESS with flames logo for the trailing arms and a new SC10-III logo for the rear suspension.
He also did also decals on Madness (the mountain sled). I can't say enough about his work. Simply AWESOME!
I must say that if anyone is looking to do this for a living, it is probably not a good field to look into.
I do it as a hobby. It is something I love to do. All my friends are always saying that I am "fiddling", or "fiddle, fiddle fiddle". I don't fiddle when I am riding. I HATE that. I just want to get out and ride. I will "fiddle" when I get home. I don't do it for the competition. I do it to relax, and unwind. If I don't have an outlet for my ideas, they build. LOL.
I have an extremely understanding wife, and a TON of parts laying around from years of building, collecting, wrecking and blowing stuff up. Her most famous line is "Don't stay up too late" as she heads off to go to bed.
I am lucky. I have people like Scott that I can turn to when I have a question. If he doesn't know, he can call someone who does. I try to relay that same integrity when people ask me questions. If I know the answer, I will tell you. If I don't, I will also tell that. I will also be willing to find the answer for you.
This sport isn't about who has the fastest sled, who has the most wild paint scheme, who can ride the fastest or who can climb the steepest chute - it is about being amongst friends and a feeling of self accomplishment.
There is no greater feeling than dreaming up a scheme that makes someone think, "That is Madness", or "It's a Sickness with you". Then when you have done EXACTLY what someone else has deemed impossible, it is a good feeling.
I can't say "Thank you" enough to Recreational Motorsports for all their assistance in all my insane ideas. Whenever I shoot a new idea past Scott he just gets this smile on his face like, "Oh, no. Here we go again."
If you see me on the trails or in the mountains, stop and say "Hey". You are always amongst friends on a sled.
I am thinking of putting a turbo on the mountain sled. If I do, I will take pictures of the good, the bad...and the possibly ugly results.
