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How long does it take to put the 2 Up seat on and off? Do all 137 and 141 have the right rear bumper for the install? I would only get Vipers with Non-Float shocks. Thanks

Looking at the side on picks it looks ike there is an inch or two of space under the Motor - Isn't one of the goals for good sled design to get the weight low? Me thinking there is no way they have been running this sled for a year - I'm guessing this was a last minute decision and this was...

They've done it again - SRViper's are close to $2,000 cheaper in the states...... Sr Viper LTX Se $12,949 in the States $14,899 in Canada I was so excited when I saw the US pricing - with the Sleds now being built in the states there is almost no justification for a higher price in Canada...

I have an 05 Venture that I've bastardized with various suspension parts. I want more power now. I have a friend who has an Nytro Motor(including ECU, cables etc..) that I can buy cheap. Are the Engines the same physical size? Will the exhaust line up? I have an Excel Header for the...

I have an 05 Venture that I've bastardized with various suspension parts. I want more power now. I have a friend who has an Nytro Motor(including ECU, cables etc..) that I can buy cheap. Are the Engines the same physical size? Will the exhaust line up? I have an Excel Header for the...

With EXUP coming on the Apex for next year and the Nytro going into it's 4th model year, one would expect(hope) that changes are coming for 2012. By adding EXUP, adding a knock sensor and bumping compression ( I think the Nytro is about 10.5:1 the Apex 12.5:1) I'm guessing we see a 145-155...

Follow this link, makes me want one. http://www.snowmobile.com/products/insi ... -1178.html

So with a full exhaust call it 10 HP with the Hindle. Head work is good for another 5-6 What about compression? Isn't it only like 10.5:1 or something? What about High Compression Pistons or peeling the headgasket? Is 160 Possible? Has anyone ever stroked the crank? What is the...

Someone has seen what looks like a finished proto running around. It's the new Cat race (Sno-pro) chasis running around with there 1100 4 stroke. Just imagine if they put the Turbo in there. Should be less than 550 lbs and over 180 HP. Isn't this the Sled we've all been asking for...

Trying to decide whether or not to do a 2011 Apex or Leftover Nytro for Next Year. If it's a Nytro Based on my research and riding my buddies S/C Nytro with 8 lbs of Boost, I don't want anything less(power), but I want it it to feel like it came from the Yammie factory. I want it to run...

With a Knock Sensor and 38mm header diameter, 39mm intake, new forged pistons, new intake cam, new hydraulic tensioner, and EXUP How will the new Engine react to Boost? Will the Knock Sensor help to keep the engine in one piece, will EXUP be a tuning nightmare? Will the MPI S/C bolt...

I'm helping a friend dial in his Supercharged Nytro. When he is cruising and gets on at 5-6,000 rpm his A/F ratio will go down to 10:1 from 11.5-1 and I can hear a backfire when I'm behind him and the sled hesitates for a second before before going again. Is this something to do with the...

Hi, I'm thinking of an Apex project, is there any Under tunnel exhaust that sounds close to stock and won't be offensive to those on the trail? The sled would be boosted. Thanks

See this post http://www.ty4stroke.com/viewtopic.php?t=85541

CR says according to Official Yamaha testing the XTX is 1.4 faster on top than the 128. They tend to test on hard pack, so too me that means that the XTX skid is more efficient. The early test riders are reporting that it rides better, and it should hook a lot better out of the hole and be...

Now that people have had lots of time on them are the XTX's really 5-6 mph faster than the 121's? Has anyone run them flat out side by side on the lake for a few thousand feet? Trying to decide on the Apex 128 or XTX and want to know how the XTX skid works on top. Thanks

Hi, I ride trails but you guys are the experts on modding. I'm doing a lot of this for cosmetics, but the weight loss isn't a bad thing. I am going to buy an 2011 Apex XTX, but hate the stock colours (Blue or Red) I want to trick it up a bit and was wondering if you guys have any idea what...

Has anybody weighed the complete 144" Dual Shock XTX skids and 136" or 121" Monoshock suspensions? I'm looking at dropping some weight on an 2011 Apex project, and want to know where I'm starting. Thanks

Sorry should have put it here Please keep in mind this pertains to riding on Groomed trails only. Off trail get an stock XTX and be happy (but if your off trail that much you really should get an Nytro XTX as it's probably a better boondocker). With EPS able to overcome the extra effort of...

Please keep in mind this pertains to riding on Groomed trails only. Off trail get an stock XTX and be happy (but if your off trail that much you really should get an Nytro XTX as it's probably a better boondocker). With EPS able to overcome the extra effort of turning a straight rail 144 I...