Dear Ralph, I have a ’94 XCR 600 that is pretty much stock except for the ports have been polished and it has a 133.5″ track on it. The problem is that I can run the tach past 10,000 rpm at will on hardpack, at almost any speed. So... Read more

Hot 440 Fan Cooled

"Dear Ralph" December 27, 1997 1
Dear Ralph, I have a 1997 Polaris Sport with a 440 fan cooled engine. What kind of top speed should I be getting out of it? When I ride it the fastest it will go is about 65 mph. I’m a big guy, about 190 pounds, but I think... Read more

Rotax Recoil Retro?

"Dear Ralph" December 27, 1997 0
Dear Ralph, Will the larger diameter recoil used on many of the ’97 Ski-Doos retrofit to a ’96? Jeff Bottom Cheyene, Wy Jeff, Yes, you could do it, but it would be cost prohibitive. From the looks of the newer engines, you would have to replace the entire recoil... Read more
Dear Ralph, I thouight that I had a pretty good understanding of how all the different jets in a carb effect overall carb calibration, but I have yet to figure out how the float bowl level effects overall jetting. I know that it must have an effect, since we... Read more
Dear Ralph, My MXZ 440 likes to dart on hard pack and freshly groomed trails. I have the camber currently set to zero and the toe out to 1/8″. Should the toe out setting be set with the skis on the ground or in the air (when I do... Read more
Dear Ralph I’ve heard that using the NGK type “V” plugs are the best for checking jetting. What about it? When using the “V” plugs, the tip of the electrode is an excellent indicator of the fuel air mix. The tip should have a silver appearance about 1/3 of... Read more

Which HyFax

"Dear Ralph" November 28, 1997 0
Dear Ralph, If I wanted to reduce slide friction in all snow conditions, should I get Teflon or graphite sliders for my sled (1997 MX Z-440 LC)? 1. What’s the difference between Teflon or graphite? 2. Will one last longer than the other? 3. Are they really worth the... Read more
Dear Ralph, I ‘m having trouble setting up the rear suspension on my ’97 ZR 580. The problem I’m having is bottoming when coming off jumps and at the bottom of drop offs and hills. It is fine on small whoops but terrible otherwise. I have tried all preload... Read more
Dear Ralph, I recently picked up my new Yamaha 600 XTC. I was really impressed However, one of the big things advertised about the sled was the “loads of pre-load” on the suspension. The problem is; there is no wrench in the tool kit to accomplish the pre-load adjustments.... Read more

Blowing Head Gaskets

"Dear Ralph" November 28, 1997 0
Dear Ralph, I was reading a “Dear Ralph” question about blowing head gaskets on an XLT. I had the same problem with my 95 XLT 600. The problem is a separation between the cylinder liner and the block casting on the exhaust sides of the mag and pto cylinders.... Read more