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Author Topic: HELP! CB450 twin spewing gas from breather tube  (Read 1792 times)

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Offline restforyoursouls

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HELP! CB450 twin spewing gas from breather tube
« on: November 10, 2009, 12:41:11 PM »
It's a '72 CB450 twin.

I started it this afternoon after having not been started since Saturday morning and it began spewing gas from the breather tube for at least 30 sec while running. 

- I took the air filters off and the gas was not coming back through the carbs
- I took the plugs out and turned the engine over and few times and no gas was coming up from the cylinder
- No gas was getting spit out the exhaust while running

I'm kinda at a loss.  I just dont know where the gas is coming from to only be spewed out the crankcase breather vent tube.

Please help.
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.a slow bike that runs great is a lot less frustrating than a fast one that doesn't.

'72 CB450 twin...leavin' it stock
'75 CB550 four....shoulda left it stock :)
'71 CT70
'75 CT70

Offline restforyoursouls

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Re: HELP! CB450 twin spewing gas from breather tube
« Reply #1 on: November 10, 2009, 03:49:59 PM »
Nevermind. I found this on google....

http://forums.sohc4.net/index.php?topic=32656.msg337653

USE THE SEARCH BUTTON, STUPID!   ::)
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.a slow bike that runs great is a lot less frustrating than a fast one that doesn't.

'72 CB450 twin...leavin' it stock
'75 CB550 four....shoulda left it stock :)
'71 CT70
'75 CT70

Offline w1sa

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Re: HELP! CB450 twin spewing gas from breather tube
« Reply #2 on: November 10, 2009, 06:41:14 PM »
Check your engine oil for smell of fuel, but I think it's more likely the fuel was coming from the carb bowl vent/overflow tubes and maybe running over the other vent.
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