Motorcycle Repair: cylinder heads, goldwing interstate, best case scenario

Question
I just bought a 1980 goldwing interstate . He says the compression is low on one cyl . Also he tells me if he leaves on the gas valve that gas gets into the crankcase . I had a kawasaki once that the diaphram in the fuel valve was the problem it had a hole and it would flood out one of the carbs.Could this also be a problem with the honda or do i had a valve or cyl problem .Also what would be the cheapest on parts . thanks  Louie

Answer
Hi Louie.
 Well, as far as the gas leak, I doubt it.  On the Goldwing, the fuel tank is under the seat and gets to the engine via a fuel pump.

 My guess would be that the problem there is in the float bowls.  The fuel pump on the GL is set up similar to the Magna.  It operates on a timer.  But if the floats don't close up and seal correctly, then some fuel will gravity feed into the carbs when left and flood the carb or carbs.  Thus the floats must work correctly.

This is not a Honda specific problem.  It happens with most makes that are configured this way.  Remember that this is a 24 year old bike and if these parts were never replaced, then they are probably worn out, being original.  Rubber doesn't last forever.

Now in regards to the compression problem, best case scenario is that the valves are not closing completely, worst case, you need new rings in the offending piston(s).

The GL is a very good bike and the early eighties models are revered by many, including me.  You have a basically good ride there. It just needs some mechanical tlc (not a lot, but critical).

Good luck.
FALCON