RMX Open House

[Jager Bomb 243]

Is that wet or dry weight in that sucker...thats an awesome weight loss!

 

[BadAftertaste]

On that sled, the major changes are the front suspension, rear suspension, skis, modified the drive clutch, modified the driven clutch, titanium clutch springs, titanium shock springs, CMX belt drive, modified the track (146"), changed the seat, coated the pipe, installed a light can and installed a shorter windshield.

I remeber one of the techs handing me a bag of track nubs that were cut off of one of your 08 RMX's that you were building when I picked up my RMX from the Dacono store. I was shocked at how much it weighed. Never did it to mine, but always considered it. Anyone have pics?

Congrats on the new venture Donovan. Best of luck. I'll get by there sometime.

 

[dfacey]

Cutting the track definitely helps and really seems to make them work better in our dry snow. We changed the pattern a little bit on the last couple we've done but I can get a picture of mine if that helps.

The sled was dry when we took those photos, should gain about 80 pounds full.

 

[blazer71]

So Donavon, what's the XMK 600 story....somewhat lighter than the 800? Have a stroker kit for the 600 kit yet

 

[PJ-Hunter]

Hope you had a good showing. Please tell Mindy thanks for the call this morning and see ya next week. BTW, the snow did not materialize into anything significant up on RE/Buff.

 

[dfacey]

The 600 may be a touch lighter but it's not significant. There's a theory that the smaller engines have less crankshaft mass and therefore less tendency to flatten themselves back out which makes them better for boondocking. Based on previous chassis, it doesn't seem likely to me that's going to a big difference but all those small changes do add up. The main reason Kellie went with a 600 is she really doesn't like the arm stretch of an 800. While she's plenty capable of riding an 800, she finds the 600 powerband to be less fatiguing. She also doesn't put herself in dumb positions as often we do, therefore making the need for more power to mask poor decision making less necessary!

We did modify the head on it but otherwise the engine is stock. With as close in price as the 600s and 800s are, if more power is important, buying an 800 to start with is more cost effective. Given her weight, riding ability, and all the weight off the sled, I think she'll give the average stock 800 some trouble. There is also something to be said for the fact that the smaller engines typically have less durability drama and certainly don't wear clutches, belts, etc. out as fast. It will also be interesting to see how the fuel mileage compares and how much the smaller engine and shorter stroke makes the whole sled feel different.

PJ - thanks for the call today...we would have liked to see you but I think you probably missed a less than enjoyable drive down this morning.

Thanks to everybody else who stopped by...we were really happy with the turnout especially given the weather today.

 

[BadAftertaste]

Cutting the track definitely helps and really seems to make them work better in our dry snow. We changed the pattern a little bit on the last couple we've done but I can get a picture of mine if that helps.

The sled was dry when we took those photos, should gain about 80 pounds full.

Please, pics would be great. It's been too long for me to remember...

 

[dfacey]

Here's a photo of how we've cut the last few tracks.

Thanks,
Donavon

 

[mountainhorse]

When you say "Dry"...

Does it have:

• Coolant?
• Oil in the shocks?

Also, did you convert this to Carbs or is it still CFi?
The diff in CFi to carbed would be pretty significant... prob in the order of 15-20lbs.

 

[PJ-Hunter]

Don't make him give up all of his secrets.

He busts his as$ to create badas$ sleds with power and lightweight.

 

[dfacey]

Mountainhorse - as pictured, it did not have coolant but there was oil in the shocks. In order to ride it, we added coolant, oil and fuel. The engine is still injected. Although the goal was to lose weight, we didn't want to do so at the expense of ultimately having a very usable and dependable sled. Given the advantages of fuel injection, I wouldn't want to give that up to lose weight. I've kind of enjoyed the last few years not having my thumbs and fingers cracked from gas exposure while changing jets...

 

[AndrettiDog]

I rode Donovan's lightweight D8. I was extremely (no pun intended!) impressed with how well it ran and how "flickable" it was. With any luck I'll get to ride his new lightweight Pro some day.