VN 750 backfiring - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 4 (permalink) Old 08-26-2006, 11:31 PM Thread Starter
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Question VN 750 backfiring

I recentlly bought a pair of coasters to replace the reed valves therefore eliminating backfiring on my 1995 VN750.
Someone told me that without the reed valves the engine would not breathe resulting in accumulating pressure that could burst engine oil seals.
Is that true?? If not how does the engine breathe, if it breathes at all.
Thanks for your help.
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post #2 of 4 (permalink) Old 08-27-2006, 12:01 AM
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No worries, you were told wrong. As far as the reeds, when the exhaust gases exit the combustion chamber the reeds let in fresh air which keeps the fuel mixture burning into the exhaust pipe that is the backfiring that people talk about.Go ahead and and put on the coasters and adjust your carbs,
Go to the Vulcan Versus and read from top to bottom, It will tell what you need to know then ask questions as there are a lot of knowledgeable people on this forum. And by the way, welcome!
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post #3 of 4 (permalink) Old 08-27-2006, 08:01 PM
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I tried the marble trick and the coaster thing and it made no difference in the backfiring .As far as the reed valves go they do not let in air they allow the crankcase vapors to be drawn it the air intake the black box under the fuel tank.Yes you can block those lines off because there is a smaller line near the front of the air box that also draws from the crankcase.I think I rather get all the vapers out . And yes it is true if you block off all those lines you could create damage on the engine.
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post #4 of 4 (permalink) Old 08-27-2006, 10:15 PM
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Krawdad, I may be wrong but I don't think so. Look where the hoses come from that connect to the reed valve housing, from the clean air tank under the fuel tank. They are pulled open on the exhaust stroke and let fresh air into the combustion chamber to bunoff any extra fuel. Also you need to adjust the fuel mixture screws to complete the backfiring process.
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