Workup to 900F Cam Swap

Posted by crestview750f on
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Workup-to-900F-Cam-Swap-tp4061837.html

Setting-up a discussion that will occur in near the future with 900F cams install in my 1982 CB750F SS.  Here's where we started after getting the carbs cleaned and a Dynojet kit.  Jetting was 68/130 (DJ jet, 140 Keihin equivalent), slide drilled out 3/16 holes, clip third from the top.  The lowest rich data point on the dyno was 10; I certainly bagged that one...cough...cough...cough...44hp....



After studying the AFR, and returning to stock jetting, we gained 12hp and were able to read something above 10 on the AFR.  On the Milton dyno, the owner (experienced tuner and racer) has found 13.2 - 13.5 renders max horsepower.  Given that is rich, compared to 14.7 stoc, I'd be happy with a tad rich and still making power.  Currently, stock CB750F with: Yoshi-style 4-1 pipe, stock jetting (68/102 jets, 53E jet needles), paper filter, stock air box...56hp.
Here's the current jetting results:



The CV diagram that shows how the parts work and when: