Re: Workup to 900F Cam Swap

Posted by crestview750f on
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Workup-to-900F-Cam-Swap-tp4061837p4062128.html

Finally!!
During cam swap, the cam chain tension was set and valve clearances were also set; cams were installed using factory markings (no degreeing of the cams). Bottom line, up front:  the bike properly jetted in stock form, dyno'ed 57 hp; with 900F cams and running rich, 59 hp.  I can gain a few hp by changing the main jet from 102 and install 98.  On this dyno sheet, the dark blue line is stock cams; thin red line is 900 cams

To bring you up-to-speed, had to rejet before the cam swap due to AFR at or below 10.  Power went from  44 hp to 57 hp with the rejet alone.  But, I changed coils after the cam swap and before this last dyno run.  The 140403 coils, Accel, caused EMI (could not get RPM readings) so the dyno run was to get max hp and AFR.

I'd venture to guess, 3-5 hp lurks with the jetting change.  With that in mind, is a 14% gain in hp at the rear wheels worth it?  May not be worth it to everyone but it's still a helluva lotta fun!