Topic: Will it fit?????

[kansassteve]

I have a 1974 CB 550. Will a set of carbs from a 1972 CB 500 fit ?? Thank you, Stephen.

[Tim.]

I get asked that question all the time 

[Einyodeler]

Yes they will fit,actually they are the same carb bodies.I run `74 550 carbs on my `72 500,I just used the jets and needles from a 500,so you might have to rejet.500 has 100 main and 40 idle jet and I think the 550`s jets were smaller.

Stephan

[chippyfive50]

I have 71' 500 carbs on my 75' 550 , and mine had 38 idle jets stock, which I bumped up to 40s. I think I am going to drop them back down, I seem to be idling rich.(which may not be the only issue)...

[TwoTired]

They will physically fit, yes.  But, there are different carb setups to match the model.  The setups are stamped on the carb body mount flanges. I have a chart with the setup specifics I know about.  It should be an attachment.  But, this is my first try doing that on this site.  Let me know if it works.

[El Taco]

I've used the same set of CB550 carbs on three different 550s and now on a 500 over the last 5 years. Bikes have all run great with no rejetting or sync.

[chippyfive50]

Thanks for the chart Lloyd, downloaded,printed and in my folder..what are its origins??

[TwoTired]

I created the chart with data collected from the Honda shop manual and its supplements, direct observation of my bike collection, and discussions with SOHC4 list members.  I only put data in there that I had some confidence about veracity.  I've heard about, but have never seen, Honda supplied booklets for their dealers/shops that specified the components for each carb setup that was supplied by the production facility.  I was never able to convince those who were quoting those books to make copies or somehow get them into the public domain for us restorers and old bike aficionados.  What a pity.

[kansassteve]

Thanks for the table, really useful information. Why don't you place it under the FAQ's ?? Thanks again, Stephen