"Who's the engine manufacturer for Polaris?????" Fuji

 

White Brothers has had the Predator now for about 6 months and 100's of dyno tests later they have produced a very good slip-on pipe that gives about 6 hp over stock. On their dyno stock it was about 40 hp. Of course, every dyno reads differently as we all know. At this time, there should not be any back-orders on the Polaris/White Brothers pipes. They have recently shipped 2,100 pipes to Polaris which should take care of all back-orders and then some. The new headpipes should be available soon and have reportedly had gains of 6 more pounds of torque and 3 more hp at 4,000 rpm's. The pipe delivers a smooth delivery from bottom to top continuing to build 3 hp more all the way through the power range.

 

Mickey. do you have plans to modify the Predator engines or chassis?
I just brought mine home today. Dealer ordered the exhaust for it.

 

Yes I do. We are currently doing a magazine article with 4-Wheel ATV Action. We will be running Elka shocks, Douglas beadlock wheels (4 on 110 bolt pattern rear hubs, 1" narrower on each side to make it the same width as the front for cross-country racing), AC Racing nerfs, bumper, etc., Rath Racing steering stem and other items, Maxxis Razr 2 tires. Hopefully a bigger gas and cleanup the body work as far as the gap between the front and rear fenders. Motor-wise will probably just be an 11:1 piston, ported head and a Polaris/White Brothers slip-on. This machine will be built for Angela Turner to ride the GNCC races in 2003 and I believe the 500cc engine will be plenty for her since she is used to a virtually stock 400EX. I am not sure which issue this article will go in yet but it should be soon.

 

Mickey, as I understand it Polaris is not recommending to rejet after installing the WB/Polaris slip on. Is the stock jetting that rich? Could a stock bike pick up power by rejetting leaner?

Thanks

Denny

 

truckracer- i need to be rejetted. We played with one yesterday

 

It's difficult to answer your question because there are too many variables in different parts of the country. White Brothers was having trouble with a lean condition in the mid-range with the pre-production models and the production models seemed to be good so until I get the chance to work on it some more, I can't really give you any good feedback. One of the local riders back here had opened up his airbox and didn't have to change the jetting so that either tells you that the airbox already flows enough air for a stock machine or that it is running rich and opening the airbox made it run better. The best thing you can do is to drill several holes in the top of the airbox cover and then cover the holes a little bit at a time to see where it runs the best. I call this "tuning by duct tape". This is a simple way to get your jetting spot-on for different times of the year when you need more or less air.

 

Harry - Any idea when the first Trinity systems will be available for the Predator?