Throttle response

Posted by alehman on Nov 15, 2012; 4:25am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Throttle-response-tp4032143.html

ok, so you all will probably hate me for bringing up a pods-on-CV-carbs-related question... but this is more a question about cb750s in general. My 79k has podded carbs with a dynojet stage 3 kit with special slide needles and enlarged drilled air holes on the slide as per dynojet's instructions, and it works really well. When I rev it in neutral, the speedo goes straight to redline with no flat spots, my plugs read a fairly good fuel mix (maybe a little rich because I've been riding at low rpms mostly, 1/4 mile to school every other day, lots of stop signs). I've also peered into carb throats with the pods off and I have full slide function  when I throttle--- someone indicated to me in the past that running pods impairs slide function.


My question is this: throttle response in neutral is great as I've explained, but when I'm at a stop sign and yank on the throttle in first gear, the bike audibly bogs a little but picks up after a moment or two. I want to think that this is a jetting problem, but I'm also considering that this is not only my first motorcycle, but also it is my first cb750... I have no basis for comparison when wondering how throttle response is on these bikes. I've read over on the cb750c forum that they just aren't like modern streetbikes and won't roar off the line, so I wonder what you guys have to say about this. If you guys yank on the throttle in first, does it bog a little/just is slow off the line, or does it sounds like I just have an issue with my jetting? Is this a cb750 thing or a jetting thing?


Also, my accelerator pump function is good.

For the record, my bike is set up as follows:

CV carbs with dynojet stage III kit
pod filters
stock 4-4 exhaust
fuel screws set at 3.5 turns out
Primary main jet @75
Secondary main jet @120 (dynojet recommends 126, which is one reason why I questioned my jetting...)

Thanks!