Racer Engine

[LittleG]

That seems like an; OOOH, There Will Be a hare scramble again.

Yes it should have been that way but will team cheney be making the journey. Gil is the defending broom ball champ

[wedge]

Not to Beat a dead horse But if you was starting from Scratch (nothing but a frame & body) what would you go for as far as engine ? This is for D stock class.
A snowmobile engine ( Yamaha 440 ) or relative or a Bandelaro 4 stroke ?
Or any other 4 stroke motor ??
Found older sleds cheap in my area but don't have a lot of Funds to through away in the Wrong places !

[countrybumpkin]

If it was me I would go with a 503 Rotax with single carb. The 484 chapperal is good too if you can find one. Both are 2 stroke. You would have to stick a lot of money in a 4 stroke to be competitive, but they sound so cool!

[ARGOJIM]

Just to clarify,
The D stock class is fan cooled 2 stroke with a single carb.. The Bandalero would run in the 4 stroke class, there is currently one other Bandalero (egoperf) in that class and other less powerful 4 strokes.

[wedge]

I already looked at the D stock class and that's why I was asking your all opinions. I like the Yamaha 440,s as I would thing parts are easy to get. Also there are some older sleds close to me at a good price.
Where or what did the Rotex 503 come in ?

[jpswift1]

Where or what did the Rotex 503 come in ?

The Rotax 503 came mostly in Ski Doo and some Moto Ski snowmobiles. I believe it was the Ski Doo 4500 and 5500 models.

[wedge]

Got it. Thank you !
Starting to look for them now.

[Don]

I think the JLO/Cuyuna 440 based on the Thunderchief was allowed with twin carbs in D stock, wasn't it?

[countrybumpkin]

I thought I saw an Attex with that set up from the factory once, but I wasn't sure. Maybe Howard Gerber remembers if they made those to race. The NATVA rules say D stock is single carb?

[hydromike]

So, if we're going back to the 1975 stock rules, it states that only single carbs are allowed, and no swapping of engine sizes/brands. I won't complain (okay, maybe a little bit...) but it's tough enough for the little 440 purists out there to hang with the G50B crowd, and even harder to keep up when the big honkin' Rotaxes pull up to the line in D/Stock.

http://www.6x6world.com/images/natva/natva-6x6-atv-racing-rules-1975-6.jpg

http://www.6x6world.com/images/natva/natva-6x6-atv-racing-rules-1975-7.jpg

"Competitors will be allowed to use the latest model available of the original engine which was installed by the manufacturer in their vehicle using a single carburetor and standard stock muffler..... No switching of engine brands or sizes will be permitted."