Author Topic: Hesitation at low RPMS and Plug reading cb750k with pic  (Read 7464 times)

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Offline bjatwood

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  • 1973 CB750-K3
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Re: Hesitation at low RPMS and Plug reading cb750k with pic
« Reply #25 on: May 25, 2011, 05:26:09 AM »
My #3 float was "heavy"ie = "gas filled a bit" and this affected my mid throttle hesitation. Put a new needle valve and float on it, new #3 plug and the bike purrs like it's brand new again!
Brian
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Offline ntm1974

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Re: Hesitation at low RPMS and Plug reading cb750k with pic
« Reply #26 on: May 25, 2011, 05:10:27 PM »

A couple of guys have PM'd me with a similar problem so here is an update:

All my spark plug cap covers were out of spec.  I replaced all the caps and WOW what a difference!  I'm sure the earlier carb work contributed as well.  The bike feels much smoother off the throttle and my plug readings seem to have stabilized.

Other lesson learned: I am thinking that I probably had a float that wasn't as buoyant as the other floats.  I'll probably replace them in the future but in the meantime I think that when dealing with unknown floats and float jets, it makes a lot of sense to use a stack to set the float levels.  Mine were all set to 26mm and #4 showed way lower in the stack.  After setting them using the stack, it worked alot better.

Thanks for the replies guys.  This forum is a sanity saver.  Now onto setting up the rest of the carb circuits!