Cb500 fouling plugs once warmed up.

[ka-ja]

Hi,
      Any chance you are loosing compression as the engine warms up?    Ken

[paul_D]

Hi,
      Any chance you are loosing compression as the engine warms up?    Ken

I have no idea.  How would you check? Just the same as when cold?

[ka-ja]

Hi,
       Compression tester should do it, check cold, and then on a hot engine, if you have a low compression, it can show as a rich mix as the burn is not explosive

[paul_D]

Fair enough. What would cause low compression when hot? I guess rings, gasket or valves.   Not a fan of that idea.

[paul_D]

electrical gremlins not getting enough voltage to the coils and faulty charging system. Fixed and fixed.

Found underlying problems. Im fairly certain my needle jets and needles are nolonger mating correctly and the intake rubbers are hard as a rock causing rich middle from the needle and lean conditions from the boots.

Ordered both new intake rubber and needle jet sets. Should bring it right back with a vacuum sync to balance everything nicely.

[paul_D]

Oh and compression was good, varied, but high enough. 105psi +

[Bryanj]

Sorry 105 isn't good enough