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If you're looking to go from a 121 to a 128, I personally wouldn't add any rail extensions. I would just move the skid back in the tunnel a little bit and that's it. The sled has a steeper angle of attack than most sleds, and that's what causes some off the trenching these sleds are known for...

That's been posted here before, but not everybody uses photobucket. There's so many sites similar to photobucket that it'd be a heck of a job writing an instruction manual for all of them. Most file hosting sites have instructions on them, and the url of that hosted picture in your post is all...

Dual bars like the Dooly's will kill your fuel mileage. The space between the bars will pack fill of ice and snow and it's like you're pushing a 2x4 through the snow. Shapers work good to help reduce darting, but alignment and shims on the stock skis will help tremendously in addition to any...

Thor452. Try posting your pics to photobucket, or a similar site, then use the forum links attached to the pic in your post and it should work just fine.

Let keep this on topic, or I'll dog pile it. Constructive criticism, or searching for solutions to issues is ok. Arguing back and forth about stupid stuff or stirring the pot with comments that serve no purpose other than to cause conflict- no.

Parts agreements have been used for generations from manufacturers in every form if industry. Your idea of biting the bullet and buying the rights to a machine and building themselves is simply a recipe for doubling the price of sleds. Look at the companies that tried to do what your talking...

10.8 isn't too bad, but if you decide to jet leaner, I'd only make very small changes, and if it doesn't seem to make any more power, I'd leave it at 10.8.

You're partially right that the 4cyl rider is a small niche market rider, but that's industry wide. Within Yamaha, the Apex is still the top seller, so from a business standpoint, why rock the boat with huge changes? A far as the rest of this thread goes.. No matter what anybody produces, from...

I have heard of a few people having the lean spike on the Nytros, but no so much with the Apex. I'm not 100% sure if anyone has come up with a definitive answer on why it happens, but I'm pretty certain it has to do with the electronic idle control on the 3cyl motors. I'm thinkning it has to do...

How soon do you have your controller set to add fuel? If you're adding any fuel below the clutch engagement point, that could be part of your issue. Your motor doesn't need any additional fuel at idle, so leave it at stock fuel settings until the point where the engine actually starts seeing a...

I was thinking that's what you were talking about. I've found some good references regarding injectors and this sort of issue, if I can find the link to it again I'll post it up. It went into the description of how they're made, how they operate and the different ways they fail, etc. Sounds...

What do you mean by a dripping injector?

Is yours more of an audible nose, or are you able to feel it too? Occasionally you can tune it out a little with a fuel tuner (or CO settings for lower rpm stumble), but is a common issue with a 3 cyl.

For those of us who have added boost to our sleds, a different battery is a must. Due to the large size of my supercharger, mine actually has to be mounted in the nose of the sled. A lighter battery is a necessary evil sometimes, and with the added weight of a large blower, a small, lightweight...

I looked into the whole cca vs pca thing, and all I could figure out is that there may not be a real standard for how various brands test them as far as conditions, testing equipment, etc.. They're all made a little different, so it should go without saying that they'd work differently. I know...

They're very proud of the lithium stuff, that is for sure. I've never tried their lithium. The 106 is roughly 1/2 the weight of the factory battery, and I sell them for $157.99. I've left my Apex out overnight before, and with a bunch of new snow on it at about 29°f, it had no trouble starting...

I have been using the B106's for the past couple seasons. Seems to be some what comparable to the Oddessey 545, and hasn't given me any troubles. Weighs 6 lbs I believe. Its on the sticker on the battery, but I'm not near my sleds to check.

I remember trying a battery that a friend uses in his race bike, and I honestly thought it was an empty display battery. If I remember right, it was a Western Powersports battery? (Blue in color if anyone knows what I'm talking about?) It was tiny and weighed nearly nothing, and started my Apex...

First I will say that this thread needs to stay on positive and helpful note or it will be dog piled. Secondly, in regards to the topic... Sounds like you are looking at running a battery-less system, using the portable power just for starting? If you're doing that for racing, you can get away...

I use the SMT-X from Perfect Power on my blower sleds, which function somewhat similar to the PC stuff, but don't require separate modules for timing and auto tune.