DOO XP Verse Nitro RTX

[rED FiSHeR]

Balance of the weight , not the weight. I know Yamaha is selling alot more than just a weight difference. Minor compared to the plus.

 

[sledneck27]

you are correct....103 HP show in rotax info I have.....so 27+ HP difference...I was looking at the HO specs by accident. As for the 399lbs sled...its happening ....everyone will find out tomorrow.....the reports for the 435lb sled are for the non X model....the X comes in even lower. and the TNT has all lightweight body parts, all alum. shocks, etc. and the 500SS is around 10-12lbs lighter I think it is, than the 600SDI. The X model 120" MXZ 600SDI is spec'd at 418lbs. Its a toss up as far as I am concerned....DOO has the weight advantage and HP to go with it for the 800 class, but Yami has the engine reliabilility, I wish I could combine the 2.

Well, like I said, I'll believe it when I see it. I just dont see these weights as realistic. Think about this, if Doo could chop this much weight off of a production sled, then why does the 440 still weigh 435lbs? Why havent they incorporated some of these weight saving ideas into thier race chassis to bring the sled down to the WPSA min of 400lbs? Obviously theyve been working on the XP for a while, yet we havent seen any of this stuff on the 440. BTW, does anyone know what the specs are for the new Doo race chassis? This will give us a big hint about the production models.

 

[CENA]

I think the riding position on the new nytro is going to be like the OLD rev, with your knees bent more than 90 degrees, not co
mfortable for long rides. Anyone else see this??

Watch the Yamaha video. He states right in the video that your knees are not bent in that way.

 

[kviper]

I don't think that statement is completely correct- while running in reverse the oil pump is also spinning backwards. That means no oil injection, they will run for a while like that but not all day... Still an awesome system though.

Does the oil pump really not work when the engine is running in reverse? Seems like a pretty big flaw if that is true.

It's not hard at all to design a pump the pumps in the same direction no matter which way the crank is turning. Take a look at any piston type air compressor for example.

I am quite sure oil pump's on the two smoke's are a simple cam that strokes a piston so they should pump in reverse. kviper