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major gas leakage from carburator
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I am bringing an old 1975 CB70 up to speed and learning about engines
as I go (total novice here). The engine's great but all parts, cables,
etc are pretty old so that's were I'm starting. Recently I replaced the
throttle cables - removed the gas tank, swapped out the cables, and put
it back together again. When I started it up I noticed the engine noise
was a bit different, but sounding good nontheless - then I realized the
puddle of gasoline on the ground. It looks like the gasoline is
overflowing from the carburator through drainage tubes. I have to close
the gas tank valve in order for this to stop. I don't understand what
is going on and feel like I am missing somethingg simple in the system.
Any advice would be greatly appreciated. IR
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My immediate thought is that one or more of your carbs' float valves is
not closing completely. Either the float valve seat is hardened and
not sealiong, or some debris is stuck between the valve and the valve
seat.
You can figure out which carb (or carbs) it is by checking the overflow
tubes from each carb. Once you figure out which one it is, take off
the float bowl (usually held on by four screws, EASILY stripped) and
remove and inspect the float valve and the float valve seat. Float
valves are CHEAP, the easiest thing to do for 31 year old float valves
is simply to replace them.
Good luck, let us know what happens, and for God's sake, buy us a round
of drinks.
Oh wait, never mind, this isn't RMH.
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First, check to see if the float height is correct. You'll probably
need to replace the float needle, seat, gasket, etc. as well as possibly
the float.
To test the float, drop it in a cup of gasoline. Leave it for a bit..
If it sinks, it's toast.
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Tim and Polarhound have given you good advice. Get on the VJMC.ORG mailing
list, Polarhound posts there frequently.
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BTW, why did you list my name twice? ;)
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But I must ask what is a CB70? I know about the CL70s and SL70s and mini
trail 70 but the CB 70 is new to me. Regardless, it is a Honda 70, so
motor problems can be solved.
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If he's really lucky and it's a CT70, you can buy complete replacement
motors for a few hundred bucks.
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