2016 race rules

[wedge]

I also wanted to ask. I am thinking of building a Racer this winter and was wanting to know what size engine I could use ? Also make best fitted for these ? Is a snowmobile engine a good choice ?
I ran a 440 Herth in my tiger back in the day . what about a 400 liquid cool engine ??
Any input would be helpful !
Also gearing and so on.
Thanks
Tj

[Joe M]

Glad I decided to visit the site. Looks like they're gitting serious about the racing saftey. I'll be making some changes to my machine.

[countrybumpkin]

I also wanted to ask. I am thinking of building a Racer this winter and was wanting to know what size engine I could use ? Also make best fitted for these ? Is a snowmobile engine a good choice ?
I ran a 440 Herth in my tiger back in the day . what about a 400 liquid cool engine ??
Any input would be helpful !
Also gearing and so on.
Thanks
Tj

It would help if we knew what brand atv you are racing and which class you want to race in. A 400 cc liquid would work but would most likely put you in the modified class with 500cc machines.

[wedge]

Well I am open on the motor at this point. I was planning on using a Max II as my platform.
Was looking at snowmobile engines so that's why I asked.
I would like as much info as possible like tires,gearing and so on. I know the die hard racer doesn't like to give this info out as I have raced everything from bikes to Sprint car's and am Not new to the racing community ! But as starting point would be of Great help so I can build and travel some distance to just get in the way.
Any help would be Great !!!
Thank you
Tj

[countrybumpkin]

Hi Tj,
The max is a good choice, just use inner bearings on the axels and beef up the jack shaft or eliminate it all together. 24 tooth sprockets on the axels from the t-20 is the best for most machines. The new Vandetta tires would be best or knobbys. Tires are really a crap shoot depending on track conditions. Any snowmobile motor can work with the right jetting. I can't be more specific without knowing which class you want to get in. You will find 6 wheel racing is pretty much 60% machine prep and 40% driver. I don't mind sharing some knowledge because the more people who race and are competitive, the better off the sport will be.

[wedge]

Did that ever get the classes set up ? I am starting from Scratch so if I know what class to shoot for that would be what engine I will get ?
Thing is I don't know how big or small to look for at this time ?
Like to have a plan before I start the build just don't know where to start ?
I really appreciate all your help !!

[countrybumpkin]

I think LittleG hopes to get the classes nailed down next month. Right now the biggest class is D stock, 0-500cc single carb, 2 stroke, fan cooled.

[wedge]

That sounds like a good class to look into. Good engine recommendation ?
Skydoo,polairess, ??
Also I take it that solid axles are a Must. But ys thing I would need the newer splinned ? I was thinking not as I plan on going lite and we aren't bogging it down in mud pits.

[countrybumpkin]

I would go for a 503 Rotax or 500 cc Spirit motor. Good power and parts availability. 1 1/4" solid axels with inner bearings and keyed sprockets would do fine. Splined are nice but pricey and heavy, and if you bend one they can't be straightened. Just be sure to have a good wheel hub that won't break or come off.

[wedge]

What did those engines come in ? I have been looking at Yamaha sleds but still looking.

[jpswift1]

What did those engines come in ? I have been looking at Yamaha sleds but still looking.

The 503 Rotax came in Ski Doo and some Moto Ski snowmobiles. Try to find one with CDI ignition and dual carbs. The 500 Spirit engine was in Arctic Cats. Also the Kawasaki TA440A, B, and C engines are a great choice. They came in Kawasaki snowmobiles. And one of my favorites, the Cuyuna 440 in Scorpion snowmobiles. Cuyuna bought out JLO/Rockwell from what I've heard. Their 6 bolt, 5 port head is a great design and can be built up to make very good power. Hydromike and I both run these engines in our Attex racers.

[wedge]

I thought that for D stock you Have to run a single carb?

[countrybumpkin]

I thought that for D stock you Have to run a single carb?

That is true. Some of the early sleds had single carbs. I would try for the newer dual carb and cdi motors and just find a single carb manifold for it. Then if you ever want to bump up to modified you would have the dual carb setup too.

[wedge]

Thats a Good point !

[LittleG]

Just to clearify on something that keeps coming back to me. The roll bar rule for 11/2 inch diameter .120. Thickness or (equivalent )means that if you use 2 inch of a.095 thickness that is considered the equivalent hope this helps. Also we are not NASCAR we don't have all the hoops and supports that they do which is why we set different standards again any questions feel free to ask thats what I am here for