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Author Topic: CB750 carbs on CB550  (Read 2105 times)

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CBR1100XXX

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CB750 carbs on CB550
« on: August 21, 2006, 09:59:24 AM »
Has anybody put 750 carbs on their 550 ?

If so where do I go as far as jetting and needle position ?

Thanks in advance
Brian
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Offline puppytrax

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Re: CB750 carbs on CB550
« Reply #1 on: August 21, 2006, 12:31:05 PM »
No idea on the jetting. But my CB500 had a set of 750 carbs on it when I bought it. It wouldn't start (luckily - long story), but the plugs were sooty black...   ::)

PO said it ran fine with them...yeah, OK...   ;D
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Offline bwaller

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Re: CB750 carbs on CB550
« Reply #2 on: August 21, 2006, 04:33:46 PM »
Brian,

I don't know anyone that made them work really well on the street , but if it's for track use maybe it'll be easier to dial them in. I read that Rob Lloyd suggested to start with 120 mains, needle clip second from the top and one size leaner pilots. He also suggests the underside of a 500/550 tank will need some gentle persuasion (read hammer) to help make these carbs fit.

Let us know how things turn out.
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CBR1100XXX

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Re: CB750 carbs on CB550
« Reply #3 on: August 21, 2006, 05:01:11 PM »
Yes, it's for my race bike

I got a set of 750 carbs with the bike which were never in stalled and would like to give them a go

I'll set them up as mentioned and give them a go, I figure it should be a low cost mod

Thx,
Brian
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Offline bwaller

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Re: CB750 carbs on CB550
« Reply #4 on: August 21, 2006, 05:35:21 PM »
In what class do you run, that you can make this change. I missed the vintage weekend at Mosport, did you race there?
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CBR1100XXX

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Re: CB750 carbs on CB550
« Reply #5 on: August 21, 2006, 07:55:05 PM »
CB550 is most competitive in middleweight production but can also run period 3 lightweight superbike

Carbs are not a concern in either class, just displacement and engine configuration

Mosport was a blast I ran both classes and it was unbelievable, Mosport is one of the first class race tracks in North America and still is

Brian
« Last Edit: August 21, 2006, 08:46:45 PM by CBR1100XXX »
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Offline bwaller

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Re: CB750 carbs on CB550
« Reply #6 on: August 22, 2006, 12:35:08 PM »
You're right about Mosport, great track, spent many action packed weekends there. Seems like a long time ago.
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