Akpilot's next Project

[plkracer]

Looking good. *Did you sleeve the joints too?

[Akpilot]

Pilot Rage-

Now that I can see that the frame is going to house this size of engine I can use the Yamaha Rage motor I purchased. *I got this motor thinking of building the new Rorty stadium lite but this Pilot presented it's self and well my mind kept turning. * If the frame stretching did not lend its self to this motor I was going Polaris 2 stroke again. , I'm still a 2-stroke guy at heart. *

Why 4-stroke for me then?
1. *Others here have been singing the praises of 4-stroke and just maybe I'm softening. *If the 4stroke proves it's better than 2-stroke then I'll be the first to change. *I'm not brand loyal to the death as many snowmobilers are, heck I currently own Arctic Cat, Ski-doo and Polaris - Yamaha is still a bit too heavy in the steep and deep IMO.[smilie=icon_bolt.gif] *

2. *In my FL800 I do not like the throttle pull, 10' cable to sno-go throttle block to carbs and oil pump is taxing on the poor thumb, and with the Rage is should be easier.

3. *I'm not still not sure about my pipe, In stock trim the Polaris 800 should have 135 H.P., but I've learned that the motor will run on any billy-bob pipe, and I'm not sure of my current pipe output, so ease of exhaust is appealing. *

4. *I've heard that the Yamaha have great torque output and that's what I want in a 800+ pound buggy.

Anyway I'm committed and it should be fun
Wayne

[FL250Modder]

hmmm *Lookin good. *I think im gonna find a pilot for my next project

[plkracer]

How close would the headers be to your seat when the motor is reversed? Also, your direction of rotation would change, so you would have to be in reverse compared to having the carbs in front.

[LEE1969GB]

If you call it a rage pilot its going to get confusing http://ragemotorsport.com/

[K-fab]

You are going to LOVE that powerplant. *It will make you snub your nose at the old Two Smoke.

I was die hard two smoker for years, but I finally saw the light of the modern four stroke and now want nothing to do with the old smokers anymore.
No more messing with mixing fuel - although I really miss the smell of a good two stroke oil being burned.
EFI - *
Power output - wonderfully wide and flexible. *Even with a CVT setup, you'll notice that the four stroke is so much more flexible than a peaky two banger that it's a really nice change.
The four stroke can be made quite quiet. *Don't be afraid to choke down the exhaust note and loose a few ponies - the loss of sound will be more than worth what you'd loose and the amount of power you're putting in the machine is already at the limit of being too much, so it's a good trade off.

Welcome to the Five Valved Club!

[Akpilot]

250 modder,
Thanks for the kind words, I find the Pilot size appealing.

Plkracer,
Oddly enough the reason I'm not reversing the motor is I would have to have expensive reverse cut helixes cut in order for it to work. *Arctic Cat uses a Dimond drive gear reduction that is on the same side as the clutches. *The secondary attaches to a thin gear box which uses gearing and planatary gears for reduction. *I wanted to take out the planatary gears an thus have a reversing unit so the transmission would be in forward gear, trans would not last in reverse. *Anyhow complexity and the helixes are not worth the effort, so I stretched it more than the FL800.

Lee,
Yea, it might be confusing but they're about as far away from me as one could get on this planet and I like the name PILOT RAGE. *I've been thinking of having the side plastic sticker that says "Pilot" to have RAGE written diagonally across the "t" in Pilot. *I'm not artistic enough maybe I can talk Yoshi into something cool.

K-Fab,
Yes all the Yamaha guys tell me (small percentage here, matter of fact I have yet to ride one). *I am looking forward to the change, really did not want to do the same thing again.
One thing about this power plant is it is not EFI, it is like the RX-1 with carbs, only the new 2008 Nytro is EFI in the 3-cylinder power plant. *Also it is not Pto gear reduced, the clutch hangs off the crand and the motor turns at a clutch friendly RPM. *And last but not least it only has 4 valves to my knoledge. *This motor found it's way into the Yamaha: Vector, Viking Pro, Nytro and Rage snowmobiles, I might be missing one not 100% sure on that. *The Power plant make about 120 hp and should be bullet proof. *Anyway I think your right I will like this motor in a buggie!! *Only time will tell if it's one ups the FL800.

Wayne

[K-fab]

Ah. *I believe you are right about the top end. *I've only messed w/the YZF motocross bikes, the RX1/Apex and the Phazer engines, so I forget that they're not all the same. *The five valve design is almost universal for Yamaha's stuff, so when the throw in a 4 valve setup I get lost! *

I also missed the EFI versus carbs. *Once again, I'm stuck on thinking about what I have. *I'm either close minded or just oblivious - not sure. *

I did get 120 hp correct, though... .. .. *well, in my head. *I didn't write it anywhere.

[opsled]

You will LOVE!!! that engine.

*Here is what the guys at Dyno Tech had to say about it.

* * * * * *opsled

[Akpilot]

Thanks for posting that Opsled!
I have not seen a dyno sheet from this engine but everyone who I talked to about this engine was right about the torque, down low just what a heavy buggy needs (compaired to a sno-go). *It looks like 9000 should be the target RPM for this motor. (I assume a -200 RPM variance with stock tacks, not sure on Yamaha's they might be closer).

One thing that worried me is the airbox and the write up you posted confirmed this, and there is no way I can put on a stock airbox. *I purchased a airbox from e-bay just so I would have the air horns, I'll need to get this figured out before I weld the chassie together as I might need to stretch it more [smilie=banghead.gif]. *Also the exhaust also has me somewhat concerned, how close in length do I need to get? will keeping all three headers the same be good enough, the stock header is pretty long and straight (running the length of the seat).
I did buy all that I could when the motor became available, wiring harness, header, muffler, both clutches. *Since then I have purchased multi-function gage, and airbox.

Again thanks Opsled, this is sure making me ancy! *Screw work I'm calling in sick... oh wait I'm doing it at the shop, dang can't even call in sick. [smilie=big_explode.gif]

Wayne