Re: Running rich below 4000 RPM - 1974 CB750K4

Posted by CR125Honda on Nov 12, 2012; 9:36pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Running-rich-below-4000-RPM-1974-CB750K4-tp4031469p4032028.html

Update time..

A close inspection of the old needles showed some grooving near the top side of the needle (about a 1/4 below the E clip area, where the needle would be at idle or just above idle).

I removed all the needles from the slides and the needle jets from the carbs. Then performed a "wiggle" test of those two pieces in the area that looked shiny / grooved.

Seemed to me to be a fairly loose fit (some worse that others) so I bought 4 new Honda OEM needles and needle jet sets. I'm  pretty sure this gamble is going to pay off. According to my "wiggle test", the new needle & jets are a much tighter fit.

Next issue I need to clarify are the springs on the spark advance. I'll post that question in another thread.

Will update again once I'm able to get back at the project.