Mikuni VM26 Float Overflow

  • DoubleDub
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07 Sep 2008 20:50 #236060 by DoubleDub
Replied by DoubleDub on topic Mikuni VM26 Float Overflow
Update: Took the carbs apart, verified the float needle operation of each carb with the bowl removed. Reassembled the carbs and they started overflowing almost immediately. Out of frustration I whacked them a couple of times with a heavy/soft rubber mallet on the side of the #4 carb and the floats magically started working. Not sure what the deal was but it hasn't overflowed since. I haven't taken it up to highway speed yet but things are looking up. Thanks for the help!

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08 Sep 2008 04:42 - 08 Sep 2008 04:45 #236108 by Patton
Replied by Patton on topic Mikuni VM26 Float Overflow
DoubleDub wrote:

Update: Took the carbs apart, verified the float needle operation of each carb with the bowl removed. Reassembled the carbs and they started overflowing almost immediately. Out of frustration I whacked them a couple of times with a heavy/soft rubber mallet on the side of the #4 carb and the floats magically started working. Not sure what the deal was but it hasn't overflowed since. I haven't taken it up to highway speed yet but things are looking up. Thanks for the help!


That's a popular remedy for dislocating crud or grit which might be interferring with the float needle-seat interface.

Small plastic hammer or screwdriver handle also sometimes works pretty well for rapping on the float bowl.

Won't hurt to also drain the float bowls in hopes of flushing such dislocated crud or grit on out of the carbs.

Good Luck! :)

1973 Z1
KZ900 LTD
Last edit: 08 Sep 2008 04:45 by Patton.

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08 Sep 2008 07:40 #236129 by wiredgeorge
Replied by wiredgeorge on topic Mikuni VM26 Float Overflow
Not sure crud is being dislocated. When I have seen folks tap a carb and it stopped leaking, many times the float was bent a tad and hanging on the upper part of the carb bowl casting.

wiredgeorge Motorcycle Carburetors
Mico TX
www.wgcarbs.com
Too many bikes to list!

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  • DoubleDub
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08 Sep 2008 08:40 #236147 by DoubleDub
Replied by DoubleDub on topic Mikuni VM26 Float Overflow
That would make more sense to me. Especially since the float operation worked 100% with the bowl removed and I used my hand to operate the float. Not sure how it would've gotten bent - is this something I should worry about coming back? Is it something that warrants new floats?

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16 Jul 2011 17:01 #463187 by calvin17d
Replied by calvin17d on topic Mikuni VM26 Float Overflow
My floats were sticking and come to find out that when installed, the floats were getting stuck below excess float bowl gasket material keeping the valve from closing thus causing overflow.

1976 Kz900 A4

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