Re: High rpm stutter suddenly appeared.

Posted by cadillac on Jun 04, 2013; 2:09pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/High-rpm-stutter-suddenly-appeared-tp4041754p4041759.html

Thank you for the speedy reply.

The garage only synced the carbs. Later I pulled the plugs to check the mixture, and at that time they looked fine. However now, after repairing the hoses between the airbox and carbs, the plugs show signs of a rich mixture. I changed the cables between the coils and plugs, because I had trouble starting, also the plugs are almost new.
I assume that the engine is at working temp. after about 15 min at about 75-80 kph, and still there is this stutter or as I presume drowning of the engine.
What can cause an engine to suddenly run rich at high rpm, surely this is pretty much fixed due to the jets, and those have not been replaced, maybe since they where put on about 30 years ago.