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Discussion Starter · #1 ·
i was wondering if anyone else has had this problem and what they did to fix it.


i have a mikuni flat slide carb. and a BRP electric fuel pump the problem im having is the pump is over running the float and gas is running out of the over flow. i tryed rebuiding the carb but no luck

the carb works great with the OEM pump

if anyone could help with my problem it would be great
 

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The MIKUNI comes set up for gravity feed fuel pressure. They have a needle and seat that are made specifically for fuel pump applications, but even then you need a return line. It's still only good for 2psi with the smaller needle and seat. I'm pretty sure it's a 2.3 needle and seat set.
 

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The oem pump might produce 5psi if you block the return, but having the return to the fuel tank makes the pressure no more than gravity feed would be on a standard motorcycle tank.
 

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why not just put a needle and seat set up for a elect pump???
 

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So I had a similar problem on one of my yamaha dirt bikes. I had to rebuild my float in the carb. I tried everything and that was issue. The bike would run but when i would sit and Idle it would spill out from the over flow tube.
 
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