Steve - very interesting. That is a lot of sustained RPMs. I'll be interested to know how that works out. I am also surprised at the jetting. What altitude do you run at? If I remember right my stock jet was a 200 which was for sea level but I am guessing you are there because of the porting? Let us know how it all works out.

And, how does that pipe sound. Is it about the same loudness as stock?

Dan

 

Hey Dan
The pipe isn't any louder until you pin it, then it is a little louder. Sounds like a chain saw lol. Neil has different silencers 2,3,4,and 5". Each weighs a pound more and is a little quieter. Mine is a 4".

One thing I forgot to mention is Aaen does the head work rather cheap. I think it was just over $100. The port timing was just over $200. The ports on the 277 didn't look to bad as far as needing to be cleaned up. If I didn't need a new pipe, I wouldn't have done port timing. Probably would have cleaned them up a little my self and just sent the head out.

Another thing is the primary spring. Going with the 200/320 didn't really hurt the engagement much. Still pretty smooth.

The sled does seem like it has more power, but I hesitate to go by feel with it being 6 months since I ran it stock. I can't wait for more snow to give it a better test.

 

Steve,

Very interesting on the pipe. I'm sure you will have more power with the milled head.

Dan

 

I changed the Main Jet from 230 to 220 and also played more with clutch weights.

I am finding the EGT very helpful when doing the jetting. My testing was on the trail, but the next day we went ice fishing and I did long pulls pulling my gear in heavy snow on the lake. Watching my temps, I am pretty sure I can go down to a 210, but will leave it for now. Since I had put the UFO in the carb several years ago, my mileage has been fairly bad at somewhere around 10 mpg (this is mainly off trail or pulling my ice fishing gear). I know now that the needle was set fairly rich at one clip up from bottom. It is now 2 up. Will leave it for now though it looks like I could go one more up.

Clutch weights have been pretty interesting. I have the 200/320 primary and a new secondary spring. Note that the secondary I run is the one recommended as a replacement for the 06. This new one however is a 1/4" longer and a little more rap. For grins, I did some testing with different weights on a 100 yrd run

5 weights.
RPMs 7400, took longer to get there. Around 4000 rpm engagement. 40.6 mph max gps average 100 yrds. 46.5 max on longer trail run. Very sluggish getting back up to rpms after letting off the gas.

4 weights.
RPMs 7550. Didn't check engagement. 41.7 mph max 100 yrds, 47.5 On longer run. Definitely less sluggish.

3 weights
RPMs 7650 came up quick but faded a little. Around 4200 rpms engagement. 41.5 mph max 100 yrds. 47 on longer run. response is pretty good.

2 weights
RPMs 7750 and faded. Around 4250 rpm engagement. 40.5 mph max at 100yrds. 45 mph max on longer run. fast shifting.

I ended up with 3 weights for now. The trail isn't a good gage of what is needed in the powder. I tend to error on the side of higher rpms in my testing to ensure good rpms in the powder. Before I had the engine work done, I had the RPMs set at about 7200 rpms on the trail which would give me around 6800 unless in a steep climb. Now, I think the engine does like a little higher rpms. It definitely pulls harder then before.

I am going out to play this afternoon. We don't have any fresh snow, but hopefully will find some good places to play.