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ATV issue...


hex0rz

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I'm not particularly familiar with ATV's or small motorsport crafts. Although, seems like the basics apply. Internal combustion engine, fuel injected, or carbed, etc.What I do not know, is the more special things related to them. So this is why I figured I should post something here as I know some of you guys are more seasoned at them.I've got a Yamaha Big bear and I think its a late 90's. Apparently had a tune up and the likes at a local dealer. My father in law begs to differ as he is having a hard time figuring out what he paid for.So I drove it a couple days ago to go looking for a deer I thought I may have killed. Took a road and got going fast. Thumb-throttle pegged all the way and in highest gear.Once it gets to speed, its like it will suddenly lose power for a moment and you can hear it. It feels like someone is hitting the brakes for a moment. It will go back and forth like this until I let off the throttle.I called the dealer and asked them, they think its the carb needing cleaned or rebuilt. I hope not as I need this for next week.I thought maybe it needs an inline fuel filter or something...Anyone have any thoughts on this?

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Those fuel tanks build up a fine dust in the bottom over a long period of time. I think I just removed the tank nipple that connects the fuel line and gave it a good flushing out. The carb I tried cleaning with carb cleaner while I had it apart but, nothing worked till I got the carb sonically cleaned.I like those in line filters they sell that are clear and can tell when to change.

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I bought my Bombadier used. It came with spare plugs... when you only have one cylinder, one plug, it must be a good spark plug. I had had it tuned & serviced in a Pro Shop... And they missed this. I couple of years later, I had it in a different shop... and they found it had the wrong spark plugs in it. But the plugs had the same brand & correct number. I couldn't believe it & insisted on the old plug back.

What I learned is there are 2 versions of the plug with the same number. W H A T ? The knobby contact must be removed & the bare threads exposed. The coil slips down inside the tube in the valve cover, and there is only a small hole for the threads to slip into the coil.

Sooo, in my case, the spark was having to jump to the coil as well as the spark plug gap.

I do not know about your machine but this is how Bombardier did it.

PS: I took the used plug, clamped in a vise & tried vise grips. The knob was NOT removable on THAT plug. I ordered more spares from a ATV shop on line & got the correct ones.

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Does it have Gas? Low on fuel? It sounds like a fuel restriction... like it uses up the fuel in the carb bowl, and can't refill fast enough so loss of power. Could be a clogged filter, restricted strainer at tank outlet, stuck float. Possibly contaminated fuel. Draw off a sample put in a (tightly capped) glass jar to settle overnight... I used to do this often in boats... (drain water separator into container)... prevented doing work that was not needed.

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