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Old 04-16-2011, 10:55 AM   #1
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Cool 1988 Bayou 300 Backfiring above idle

I have a 1988 Bayou 300 2WD that runs fine at idle and runs fine once get above 1/4 throttle. As it warms up it does better and better but never running like it should. The problem is always at about 1/4 throttle, it spits sputters and backfires until I get rpms higher then runs fine whether in gear or idling. It will run like a scalded dog as soon as you get past the sputter. Runs fine at top speed unless you let the rpms get down due to gearing you can feel it while rolling almost top speed but in 5th gear as the rpms lower a little if you slow down some and try to get back into the throttle once speed/rpms elevate goes back to running normally. I have had the carb rebuilt, everything seems to be adjusted properly, has a new stater, new plug, new fuel filter, new fuel lines, new fuel with a couple ounces of fuel cleaner, new air filter. This problem was exactly the same before and after all of these repairs. It seems to have made no difference no matter what. When it is cold it runs horrible until having warmed up at lease 5 minutes or so, as in it will die as soon as you so much as touch the throttle. One more bit of info, if you put the choke all the way up and drive it, it seems to help but the problem is still there.
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Old 04-16-2011, 12:28 PM   #2
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Have been reading up on the cv type carbs as employed on the Bayou and Prairie bikes. I have a 2000 Bayou 300 2WD & a 2005 Prairie 360. Bought both of them as fixer uppers. Had to rebuild top end on both. Both had sat for a while and the carbs had gunked up. Cleaning out the carbs can sometimes require a piece of wire run through the small passageways inside the carb bodies. I soaked the Bayou carb in cleaner for a week and it still didn't completley clean those bores. These carbs have multiple circuits that come into play at different throttle settings. Your problem is occuring at just such a transistion. It may well be something still not completley clean or a set up issue. I am attatching some info about these carbs hope it helps. A valve adjustment is also a good idea. Checking the cam chain tightner once a year is another good practice. Or even installing a manual adjuster. Both of these actions will go a long way in preventing the chain streaching, which can wreak all kinds of deviltry. I just found the APE site last night I plan on installing one of these on both of my machines.
Jim

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Keihin 32CVK Disassembly

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Last edited by foot0069; 04-16-2011 at 12:33 PM.
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Old 04-16-2011, 12:46 PM   #3
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Here's another one.
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Old 04-16-2011, 11:57 PM   #4
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Wow, that is a ton of info. I will have to get to studying. I am almost wondering if buying a new carb would be a better alternative. I could take this thing apart 10 times and still miss a port. I work in an automotive dept. at a chevy dealer and have access to tons of mechanics. The one that built the carb is one of the best mechanics I've ever come across...as far as cars go definitely, small engines he can do to an extent but cars/trucks are his forte. But I've seen him fix some pretty off the wall stuff, usually give him time and he'll figure it out. He even had to admit he wasn't used to these type of engines. We are all pretty much at a loss though especially when we are almost certain it is a fuel/air issue and with all we changed to have no change whatsoever is crazy. Anyways, I appreciate the info greatly and will get to work, and let you know what happens.

Thanks again
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Old 03-13-2012, 08:25 PM   #5
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Was having the same trouble with mine but it would work perfect for a while then run like junk missin and backfiring, last time it started acting up I drove it home let it sit for 5 min and tried to start it. It acted like it was gonna start but never did. So i did a compression check and came up with 60psi, went for a leak down and exhaust valve failed. Made sure it wasnt adjusted too tight, then pulled the head. After removing the head I noticed the exhaust valve was open but not bent, a very gental tap with a rubber mallet and it seated right in place. Haven't put it back together due to a broken head bolt, but Iam thinking the exhaust valve sticking could have been my problem. Any other opinions on the matter?
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