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Author Topic: Rev issues on my 550  (Read 1364 times)

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Offline cb550choppa

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Rev issues on my 550
« on: May 16, 2012, 03:55:43 PM »
I got my bike all running it runs awesome to 5500rpms then breaks up I did dyna electronic ignition cleaned carbs starts 1st kick plugs seem alittle rich like always nothing changed I still have same accel coils same carb set up seems snappier the more load on the motor the more it breaks up it's finally nice I wana ride but it's no fun when bikes not 100%
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Offline cmonSTART

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Re: Rev issues on my 550
« Reply #1 on: May 16, 2012, 03:58:11 PM »
It sounds like fuel starvation when the demand gets high.  Refresh my memory what exhaust/carb setup you have?  IIRC it was 4 into 1 (straight?) with no air filters at all.  Correct?
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Offline cb550choppa

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Re: Rev issues on my 550
« Reply #2 on: May 16, 2012, 04:03:28 PM »
It has 4 into 2 straight and open carbs but has for 6 years never done this before Ive been contemplating making a intake so I can run a single Harley carb if I can't figure it out
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Offline cmonSTART

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Re: Rev issues on my 550
« Reply #3 on: May 16, 2012, 04:30:48 PM »
If it's a new development I would check for obvious things like a restricted fuel filter, or a plugged tank screen (around the fuel pickups - if equipped.) 

You might also want to take a quick peek at your advance mechanism just to make sure it's moving freely.

Any other recent changes?  Missing anywhere or smoking? 

If these don't pan out You might want to pull the carbs/bowls and take a look inside IMO. 
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Offline cb550choppa

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Re: Rev issues on my 550
« Reply #4 on: May 16, 2012, 04:51:37 PM »
I checked fuel lines tryed it without fuel filters and with I put different petcock no change changed plugs it almost seems like ignition but idk I checked everything but pulling carbs again cause if I pull um I'm temped to not put them back
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Offline cmonSTART

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Re: Rev issues on my 550
« Reply #5 on: May 16, 2012, 05:03:47 PM »
Is your battery good and charging system working OK?

Edit:  A bad battery and/or poor charging system can sometimes cause symptoms like that. 
« Last Edit: May 16, 2012, 05:07:02 PM by cmonSTART »
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Offline cb550choppa

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Re: Rev issues on my 550
« Reply #6 on: May 16, 2012, 06:47:06 PM »
Brand new mini battery and I'll check charging system since I'm kick only it's hard to tell without putting a meter on it
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Offline cb550choppa

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Re: Rev issues on my 550
« Reply #7 on: May 17, 2012, 02:35:24 PM »
I messed with it today if I slowly give it throttle it revs to 7k then losses rpms to 6k and then it fuel sprays out the carbs guess I'll try smaller jets 
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Offline lucky

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Re: Rev issues on my 550
« Reply #8 on: May 17, 2012, 03:04:07 PM »
Many facts missing.

Honda CB550.
Year????
Intake system????
Exhaust system????
Idle jets??
Main jets???
Needle position??
Mixture screws??

Putting on a single carb will work will be a lot of work.
If you know a lot about car carburetors then you have a chance.
TWO carbs would be easier.

One Mikuni 42m carb? I doubt you can make that work.
Intake would have to be perfect and jetting could be a 3 month investigation.
You could try a Honda car carburetor for a similar sized engine.
Maybe even use the intake manifold too.
Can you TIG weld aluminum?
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Offline phil71

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Re: Rev issues on my 550
« Reply #9 on: May 17, 2012, 03:35:01 PM »
Isn't this the nitrous bike? What happened to that?
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Offline cb550choppa

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Re: Rev issues on my 550
« Reply #10 on: August 12, 2012, 06:47:41 AM »
ok im still fighting this i took that rack of carbs off and im rebuilding origanals and down sizing jets it had 1/16 drilled jets and needle on middle clip was like that for years but i swapped carbs to a suposed to be "nicer" set but im just going to rebuild mine im going to try a 125 main it has nothing on carbs and straight 4 into 2 pipes
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Offline 754

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Re: Rev issues on my 550
« Reply #11 on: August 12, 2012, 08:09:25 AM »
 Try changing the "drilled jets" back to stock... Honda may still have them..
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Offline cb550choppa

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Re: Rev issues on my 550
« Reply #12 on: August 12, 2012, 12:36:07 PM »
i have a set of 125s and 100s
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