Re: Running rich below 4000 RPM - 1974 CB750K4
Posted by robs750 on Nov 03, 2012; 11:42am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Running-rich-below-4000-RPM-1974-CB750K4-tp4031469p4031609.html
The only way to determine if the jets are worn/modified are to measure the ID's with guage pins and refer to a stock size chart.You could even possibly use a set of number drills and a mic.Now part of the needlejet and needle can show signs of wear just like you discribed.
I'm willing to bet that there could be a difference on the taper of the new needle compared to the stocker.
My son bought aftermarket carb kits for his DOHC .We found that the jets were not machined the same as the stock jets so we just reused them.
Another way to get some original jets may be to buy a set of used carbs.
I would try lowering the needles.This should lean out the lower/midrange of throttle.