Hellloooo LADIES!

Good to see some familiar folks around here. Just had a particular question for the folks of DSMCentral and what they think. I now have a 2005 Yamaha Raptor 660 as my fun-toy of choice. I'm looking to install a wideband O2 setup to make tuning the carbs on this badboy super easy as it's becoming more and more common. Just wondering if the guru's here could tell me if there would be any difference between the widebands used on any regular automotive application and say an ATV?

If there isn't any real difference, I'll be looking to pickup a used Innovate LM-1 for those that might be looking to sell

Since it's a 4-stroke, it should be the same. May want to look around and make sure the target A/F ratio.

Agreed, however, the stoich will remain consistent if it is a gasoline engine, so the target remains the same. With that said, will you have it on a dyno? That's the only really solid way to pin down your target afr. Not too familiar with atv's, can you adjust timing?

I know you can tune the carb but I'm not sure about timing. When I was into bikes, I rode a 2-stroke. Those Raptors are monsters though.

14.7:1 is the magic number in a 4 stroke gasoline motor...

That's true... for a perfectly efficient mixture. In most cases, the best power (reliable) is slightly richer.

No dyno on hand, just the one in the seat o' the pants. Closest actual ATV dyno is said to be just north of Indy.

The ignition curve is pretty much set by the rev box. It's non-adjustable as far as I know. Although, the aftermarket rev boxes may be adjustable, not sure.

Some of the guys on the Raptor site have already tried the wideband setup with great results. They say they're shooting for somewhere in the 13.0-13.5 range and getting good results. They're more or less amateurs at it and I knew you guys would be more knowledgeable on this sort of thing. It seems that the widebands they are running are no different in type than the ones run on cars. I suppose the basic principles would be the same, just on a smaller engine.

It's a single cylinder, 660cc, dual carb setup, gasoline 4-stroke. I'm about to rejet for taking the spark arrestor out and the airbox lid off.

BTW, supposedly these things run the same 1/8th mile time STOCK as my Camaro and the Talon ran .

thats what happens when you shave off 3500 lbs. you don't need near the motor to go the same speed.

They are supposed to be in the 40-45hp range stock and 400lbs wet weight.

Yeah, so with a 200lb operator, you get a P/W ratio of 13.33 on the Raptor. To get the same thing (assuming about 3150+200 for car) you would need roughly 251 horsepower to the wheels (assuming Raptor is 45 to wheels...)

I'm thinking stage 1 cam, ported head, and stock bore 11:1 piston before the year is over for a pump gas beast...

giggity giggity

I think the best part is it cost a fraction of what it would have cost me to do this to the Camaro or Talon. $150 for a cam, $120 for a piston, and about $200 for a professional port job. For under $500 it'll be a BEAST. I think the only thing that really costs a bunch in comparison is the exhaust for these things. A decent dual exhaust runs about $600 new and you can find the singles for around $350.