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bogging down on top end?

  • Thread starter Thread starter robgusto
  • Start date Start date
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robgusto

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My 81 gs750 with pods has been rejetted. I went 2 sizes up on main jet to allow it to run richer. Since I went up the problem seems worse. When I'm toward the top RPM (can't tell for sure I don't have tac) the bike bogs down. It will actually accelerate a slight bit when I throttle back. So Im good through idle and mid range but I will bog down, then I let off throttle, the bike will bump forward a slight bit, then slow down. I know I read a post that that is indicative of where to look next for rejetting but can't find it. Any ideas?
 
Hi,

Have you done plug chops? What do the plugs look like? Most of the time a change to pod filters will require going up 4 or more sizes. Do you have a modified exhaust too? If so, add a couple more sizes. Do more plug chops and check the mixture.

For reference, I found these on some guy's website:

For CV Carb jetting, see the very informative article at Factory Pro. Also see the carb jetting tips at Motorcyclecarbs.com, Inc.



Thank you for your indulgence,

BassCliff
 
Thanks for the quick reply! I am currently up 4 sizes on main jet and my dynojet kit only had my bike (with current config) up 2 sizes. I hesitate to go up more sizes as the condition seems to have gotten worse with the last upsize? I am still searching for the post that references the condition where the bike slightly accelerates after coming off throttle. I have not tried a plug chop but I will give it a try later this week. I have tweaked a lot but I'm going back to the dynojet kit recommended components and then will chop to see where I'm at.
 
That sounds like a lean condition gaining power when you roll off. I would run some plug chops so you would know exactly. Dynojet jets do not have the same numbering system as stock jets.
 
Or his mains are too big making WOT rich and boggy. Easing the throttle puts it back to mid range before fouling the plugs. Do a WOT chop to be sure.
 
When it starts bogging down, hold the throttle steady and give it some choke. If it improves you're lean.
 
They were Mikuni jets. Thanks for the replies! I was running lean..I replaced the (diaphram?)needles with slimmer ones and now I'm running perfectly. I just ran through all the gears on a test ride and was preparing to do a plug chop and choke test. I was sure that the needles would not fix the problem but they did and now just fine tuning. I have a colortune that I've been waiting to play with!!
 
robgusto said:
They were Mikuni jets. Thanks for the replies! I was running lean..I replaced the (diaphram?)needles with slimmer ones and now I'm running perfectly. I just ran through all the gears on a test ride and was preparing to do a plug chop and choke test. I was sure that the needles would not fix the problem but they did and now just fine tuning. I have a colortune that I've been waiting to play with!!
Click to expand...

so you installed a jet kit?
 
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