Carb overflow issue - Yamaha Raptor Forum
 
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post #1 of 5 (permalink) Old 03-31-2019, 06:07 PM Thread Starter
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Carb overflow issue

Hello all,

I have been having issues with my carbs overflowing.

This list is in order.
Ive Tried:
  • Checked to make sure that the bowls will actually hold fuel - drain screw is good.
  • valves feel in good condition, no catching or stickiness
  • tried clear tube method but was noticing I was having to adjust the floats way above spec.
  • Turning the carbs upside down and changing the float measurements to 13mm like the Yamaha 660 Manual states - this gave me the best results as it was not overflowing as it sits but once I rock it back and forth it then will start to overflow.
  • Changed to better looking valve seats
  • Turning the carbs 90 deg until the float tang rests on the valve and measured 13mm/Upside Down Measurement 10.5mm - alot of overflow w/no rocking

Should I just keep adjusting the floats up until there is absolutely no overflow, even from rocking? If I do, the float measurement will be something like 14mm @ 90deg.

Thanks for the help!
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post #2 of 5 (permalink) Old 03-31-2019, 06:37 PM
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You must be measuring from the wrong place when setting height OR the float valves are still leaking OR floats have gas in them OR drain screws are leaking... there's simply no other way for gas to get into the drain lines.

'01 660 Raptor, Burgard +2+1 arms, YFZ Shocks, LSR anti-vibe, CTR pipe, jetted, K&N
'01 Polaris Scrambler 400, K&N
'02 Honda 400ex, Big Gun pipe, jetted, K&N, Lonestar +2 A-arms, Lonestar anti-vibe
'04 Suzuki LTZ400
'16 RZR XP4 1000 Turbo
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post #3 of 5 (permalink) Old 03-31-2019, 06:53 PM Thread Starter
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Ok, so which is the correct method? Upside down or [email protected] degrees?

And I'm measuring from base of the carb to the highest point on the float.

Pics are @90deg
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post #4 of 5 (permalink) Old 04-01-2019, 09:15 AM Thread Starter
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So after extensive troubleshooting I've come to the conclusion that the rubber on needle and the o ring for the seat are just too worn out.

I took one of the bowls off of the carbs and let the fuel flow in while gently holding the float up to keep the needle closed. This resulted in fuel still pouring out of the seat/needle which leads me to believe that both are just old and worn. This bike had been sitting with gas for about a year or so.

I ended up ordering a rebuild kit, should be here tomorrow and I'll post results.
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post #5 of 5 (permalink) Old 04-01-2019, 01:12 PM
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Good call - the o-ring around the seat is often overlooked as a possible cause.

'01 660 Raptor, Burgard +2+1 arms, YFZ Shocks, LSR anti-vibe, CTR pipe, jetted, K&N
'01 Polaris Scrambler 400, K&N
'02 Honda 400ex, Big Gun pipe, jetted, K&N, Lonestar +2 A-arms, Lonestar anti-vibe
'04 Suzuki LTZ400
'16 RZR XP4 1000 Turbo
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