Poor Education

"Dear Ralph" November 28, 1997 0
Dear Ralph, Your Oct/Nov ’96 issue illustrates one of the major problems in educating snowmobilers: CONFLICTING INFORMATION! On pages 66 & 67 Jim Shepard and Bill Westhoff tell us that a more aggressive (greater angle) secondary clutch cam will increase the squeeze on the belt. This is contrary to... Read more

Tinker With the EFI?

"Dear Ralph" November 28, 1997 0
Dear Ralph I own a ’97 EXT 580 EFI and was wondering if you can give me some tips on what I can do to modify my sled to get more power. Is it worth playing around with the EFI or should I just buy a bigger sled? Terry... Read more

Sticky Solutions

"Dear Ralph" October 28, 1997 0
Dear Ralph: What is your recommended procedure for removing stickers from snowmobile hoods without damaging the hood? Is there any quick and easy method? Whatever you do, keep razor sharp blades and such away from your sled. The best method of removing plastic and vinyl decals is by using... Read more

Leaky Exhaust

"Dear Ralph" October 28, 1997 0
Dear Ralph: My ’94 Vmax 500 has a continual leak at the Y-pipe area. Oil is dripping down into the belly pan and sure makes a mess. I’ve already installed new gaskets, but still have the problem. Any suggestions ? Even though new gaskets are used, you will sometimes... Read more
Dear Ralph: Are there advantages of the rotary intake that Rotax uses on many of their twin cylinder engines ? Are rotary equipped engines more powerful than piston ported or reed intake designs ? First let’s compare the rotary intake to a piston ported engine. The advantages of the... Read more
Dear Ralph: I have a 1995 Indy XLT and the head gasket keeps blowing out. What is the solution to this problem? You’ve got one of two problems. Most likely is that the water (coolant) filter is partially blocked (plugged) and the coolant flow is reduced. This reduction in... Read more

Flooded Engine

"Dear Ralph" October 28, 1997 0
Dear Ralph: I have a flooding problem with my engine. If the sled sits for a while without turning off the gas, the crankcase gets quite a bit of gas in it. J. Barsness One of two things is happening. We had a similar problem on one of our... Read more
Dear Ralph: What is “tunnel porting” ? Is this only a Ski-Doo thing ? Lee Kempffer To be accurate, tunnel porting is performed on rotary valve intake engines, and since Ski-Doo is the only sled maker using this type of intake, it is a “Ski-Doo thing” . This procedure... Read more
Dear Ralph: What is the difference between Mikuni VM38SS and VM38AL carbs ? I thought that the XLT Special and XC 600 were using the same engine, but the SP specs say it has SS carbs, and the XC says AL – what gives ? Nothing more than an... Read more

Single Pipe Doubts

"Dear Ralph" October 28, 1997 0
Dear Ralph: I’ve heard somebody say that it is nearly impossible to get over 110 horsepower out of an engine with a single pipe. If this is the case, then how are we to believe that the MX Z 670 and SX 700 produce around 115 hp ? It’s... Read more