Why detune ?

there are agreements between manufacturers to keep them under 1000 cc's so they keep the SxS classification

So I'll never see my Apex motor in one ? That sucks, I love that motor. Also bullshit to have to add turbo when a great n/a motor sitting at their finger tips.

I believe the sled has 135 now. At that rate this motor being 50cc less should put out 128hp. So they definitely detuned it! Why? Could be Lawyers, drivetrain limitations (axles too small, brakes, etc) wanting the ability to bump it up in a year or two......who knows! If I was running Yamaha, I would have given it a 160 hp Apex motor, and a turbo version with 240 hp, in both a 2 & 4 seater, two years ago!!!

Rdog said:

So I'll never see my Apex motor in one ? That sucks, I love that motor. Also bullshit to have to add turbo when a great n/a motor sitting at their finger tips.

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I would not say never. But they may need to re-classify the vehicles. I believe at some point they will start making vehicles with more than a 1000cc's but it may be a while

Anyone remember the YZF450 race quad from Yamaha. They had to retard the timing to meet emission standards. After you purchased the quad you would move the timing gear one
tooth to advance the timing and the quad came to life, the dealers would even do it for you. I know this thing has a catalytic converter but maybe they also had to "Detune" for emissions
and maybe there is a little tweeking that can be done.

Gunny said:

Anyone remember the YZF450 race quad from Yamaha. They had to retard the timing to meet emission standards. After you purchased the quad you would move the timing gear one
tooth to advance the timing and the quad came to life, the dealers would even do it for you. I know this thing has a catalytic converter but maybe they also had to "Detune" for emissions
and maybe there is a little tweeking that can be done.

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They did and this motor will be very simple to uncork and make very good power without adding a turbo.

Rdog said:

So I'll never see my Apex motor in one ? That sucks, I love that motor. Also bullshit to have to add turbo when a great n/a motor sitting at their finger tips.

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BTW...Apex motor is 998cc.

rikman said:

BTW...Apex motor is 998cc.

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You are right , and I should have remembered that. Drank to much over the weekend. PUT IT IN THERE.

Vital said:

They did and this motor will be very simple to uncork and make very good power without adding a turbo.

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I hope this is true and bet it will be possible.

Desertdog said:

there are agreements between manufacturers to keep them under 1000 cc's so they keep the SxS classification

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What would the classification be if over 1k cc's?

I think over 1000cc it wouldn't be considered a recreational vehicle anymore.

MoparProud said:

What would the classification be if over 1k cc's?

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Bad azz ... like my 1800cc yamaha jet ski.

Rdog said:

This motor in a sled is a 1049cc putting out 130hp. Why not leave it that way ?

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My guess is liability. It's easy to bottle it up and let the after market uncork it. We know the power is there and it's going to be easy to get to.

MoparProud said:

What would the classification be if over 1k cc's?

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That's the problem, they don't have one, so SxS rules don't apply. There could also be other requirements that come into play like DOT crap.
not sure of all the other requirements

The original Yamaha Genesis 3 cylinder hit the market in 2005. It was a 973cc w/ triple Keihin CVK carbs and was rated at 120hp. I believe it was dyno'd at a slightly higher output, about 122 - 123. The 1049 EFI engine from the Nytro was rated at 130, but good ones put out power in the high 130's. With a few bolt ons, tricks, and efi controller, they will crack 150hp. If I am forced to guess, the 998 in the YXZ will probably push up to 120 peak hp stock, but the low end torque will be better.

A little off topic I suppose..

Why haven't I seen/heard anyone asking for the R1 motor? They use it in a motorcycle, a jet ski & a boat...why not a sxs?

Sixgunz said:

A little off topic I suppose..

Why haven't I seen/heard anyone asking for the R1 motor? They use it in a motorcycle, a jet ski & a boat...why not a sxs?

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More torque and balance from a 3 cylinder.

Independent Dynotech Research testing confirms Genesis® Top Performance Engine output.

PLEASANT PRAIRIE, WI. –Yamaha engineers increased the performance of the new Apex by making a host of small updates that resulted in a new peak horsepower of 162.8 in independent Dynotech Research testing on a 2011 preproduction unit. That’s a nearly 10 percent increase over the previous-generation 4-cylinder Genesis engine. It boasts a ridiculously wide torque curve with a remarkable peak of 109.8 ft/lbs at 7300 rpm for arm-stretching acceleration. Additionally, it features the first Exhaust Ultimate Performance, or EXUP® valve found in a snowmobile.

Yamaha brought a preproduction Genesis 130FI engine and a full-production Genesis 120 engine to (our old friend Olav Aaen) at Aaen Performance’s dyno testing facility for same-day, back-to-back testing in order to determine the extent of the performance difference.
Peak horsepower figures were 138.6 HP on the FX Nytro and 122.6 HP RS Vector. Both engines showed a very similar curve profile, holding their respective peaks for several hundred rpm.
Torque showed a similar gain, from the carbed 120 to the fuel-injected 130. The Vector engine showed a peak torque figure of 82.9 foot/pounds. The FX Nytro
engine pulled 94 foot/pounds at 7100 rpm.