Bear tracker 250

[cecil30-30]

I was given a yamaha bear tracker 250 and it just doesn't want to take the fuel to well when your riding it. It has a brand new carb on it. It always fires right up and idles good and will take the fuel just fine when in neutral. But once you start riding it and get out of 1st gear it starts missing and wanting to die like it doesn't want to take the fuel. It also has a new plug. Any ideas on adjusting the carb? Its kinda hard to adjust it while you're riding it.

 

[TN Song Dog]

Sounds like you have fuel and spark. Check for air flow issue?

 

[hillbillyfab]

I wonder if the new carburetor is adjusted correctly? In my experience most all of them need tweaking with the air/fuel ratio screw to get them to run properly. I like to screw it all the way in, carefully and then back it out 2 full turns and go from there.

 

[Remington700]

Good advice so far. Could be a dirty fuel line limiting fuel at higher speeds. Does it have an in line filter that could need replacing?

 

[cecil30-30]

Good advice so far. Could be a dirty fuel line limiting fuel at higher speeds. Does it have an in line filter that could need replacing?

It does. But we have replaced it already. Its weird because sitting at idle you can hold it qide open and it has no hesitation at all. Take the fuel just fine. Only does it under a load while rising it. Which makes it hard to adjust the carb.

 

[Blockhouse]

Is the exhaust/spark arrestor clogged? Many times that will cause a problem that only occurs under a load.

 

[cecil30-30]

Is the exhaust/spark arrestor clogged? Many times that will cause a problem that only occurs under a load.

Not sure. Ill see if I can check it today.

 

[Blockhouse]

Good luck I had a similar experience with a big bear. Thought it was filter in tank, carb etc. end answer was I left the choke on too long and fouled the plug. New plug and it ran like new - don't just clean the old one - go to auto store.

 

[Wade195]

Something else that can be an issue is tank venting.

If the tank is not vented it will do exactly what you say.

just loosen the cap while riding and see if it helps?

 

[cecil30-30]

I had it out yesterday and tinkered with it but still not fixed. I tightened all the clamps around the carb and air box. It.does have a spark arrestor but I couldn't tell if it was clogged or not.

 

[TN RDG RNR]

Those are nitrous for getting a crack in the rubber intake boot between carb and head. Start it up and at idle spray ether on that boot. If it idles up that's going to be your problem.

 

[double browtine]

I would put a new air filter on it if you haven't already done it. And like Wade195 said, it could be the vent is clogged, or the rubber intake boot. Good luck getting it back running in tune!

 

[cecil30-30]

Those are nitrous for getting a crack in the rubber intake boot between carb and head. Start it up and at idle spray ether on that boot. If it idles up that's going to be your problem.

I will try that. Thanks for the tip