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Old 01-18-2007, 09:27 PM   #1 (permalink)
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Unhappy '86 Bravo 250 Bogs Out

Looking for some help here. I recently bought an old '86 Yamaha Bravo from my boss for $200. When I bought it however, it came with a slight problem I thought I could fix easily. It starts pretty well but it won't drive unless the choke is all the way on and then bogs out when you go pass a certain point on the throttle. Plus, it won't idle with the choke all the way out. Pulled of the carb and cleaned it out good and checked the jets and the needle and they were all good. Put the carb back on and it does the same thing.

Any help on this would be helpful. I'd prefer not buy an new carb or try to find a used one.
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Old 01-19-2007, 05:45 AM   #2 (permalink)
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look for a crack on the intake, the angled mounting flange is weak. I had to rework one!
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Old 01-19-2007, 08:45 PM   #3 (permalink)
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thanks, I'll try that this weekend.
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Old 01-20-2007, 08:44 AM   #4 (permalink)
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I took a 1/4" piece of alum and drilled the mount holes and the center with a hole saw, then drilled and taped the other
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Old 01-29-2007, 01:41 PM   #5 (permalink)
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Bravo running poorly

Just saw your post. It could be what was already suggested by others, but it could also could be the crank seals sucking air.
Has the machine been sitting a long time?? Get it running and spray a very small amount of starting fluid around the crank seal areas. If the machine starts to race up in RPM that is what is wrong. The air will lean it out to the point where the machine won't run at all on the primary jet in the carb.
This would mean a complete engine rebuild with the crank seals. That is what it really sounds like to me. I hope I am wrong, and hate to be the bearer of bad news!
good luck!
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Old 01-29-2007, 03:31 PM   #6 (permalink)
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Rememberd something else!

A long time ago we had a problem with the coil wire shorting out intermitenly. It is the orange and black one under the dash.

We also had a problem with the fuel filter in the tank. YES in the tank. Unscrew the big end on the bottom of the tank. It is right there. Take it off!! We ripped ours off, if you have to.
Put in another one where you can get at it inline somewhere else. Just still thinking for you. Been riding and fixing these things since 1990. Still have both of them, Bought them new and they are still going strong. Would like to know how you make out!
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Old 01-29-2007, 05:47 PM   #7 (permalink)
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Oh yeah sorry the 250 I was working on was an old enticer but still the same motor I believe? But spraying the starting fluid around the carb flange would do the same.
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