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Author Topic: 500 to 550 transplant  (Read 1042 times)

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Offline Bubba0374

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500 to 550 transplant
« on: November 16, 2008, 08:53:55 PM »
I didn't find much searching for this, but would anyone see any immediate hang ups or problems with just
switching the 500 block to a 550. Such as carb settings, mounting etc. I am considering one of these two blocks off ebay

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=300273597570&sspagename=STRK%3AMEWAX%3AIT&viewitem=


http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=310022749806&sspagename=STRK%3AMEWAX%3AIT&viewitem=
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73 CB500, 75 CB750, 74 XL250, 83 CR250, 78 Nova Rally, 54 Willys Cj3b

Offline mark

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Re: 500 to 550 transplant
« Reply #1 on: November 16, 2008, 09:48:30 PM »
I've heard it can work....

I would prefer the '78 (your first link) over the '75 for the top-end improvements.

You may need to use some other 550 bits... rear sprocket(different primary gearing), clutch cable bracket(maybe cable too) come to mind.

The 500 carbs and intakes should fit but might need jet changes.

Good luck.


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1976 CB550K, 1973 CB350G, 1964 C100

Quote from: HavocTurbo on March 19, 2009, 09:31:01 AM
F you mark...... F you.

Offline derkafer

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Re: 500 to 550 transplant
« Reply #2 on: November 16, 2008, 09:53:25 PM »
But as far as bolting it in- its a direct replacement right? Thats what I understand...  :-\
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Offline paulages

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Re: 500 to 550 transplant
« Reply #3 on: November 16, 2008, 10:27:48 PM »
the 550 engine will drop right into a 500 frame if that's what you mean.
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paul
SOHC4 member #1050

1974 CB550 (735cc)
1976 CB550 (590cc) road racer
1973 CB750K3
1972 NORTON Commando Combat
1996 KLX650 R

Offline Bubba0374

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Re: 500 to 550 transplant
« Reply #4 on: November 17, 2008, 03:30:24 AM »
Also whats a good place to buy new internal parts such as cam and primary chains, Gaskets etc.  Because everything on ebay is obviously gonna be used
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73 CB500, 75 CB750, 74 XL250, 83 CR250, 78 Nova Rally, 54 Willys Cj3b

Offline paulages

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Re: 500 to 550 transplant
« Reply #5 on: November 17, 2008, 08:51:18 AM »
Z1enterprises.com
servicehonda.com

search the FAQ's for a thread about where to find parts. there's a good list.
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paul
SOHC4 member #1050

1974 CB550 (735cc)
1976 CB550 (590cc) road racer
1973 CB750K3
1972 NORTON Commando Combat
1996 KLX650 R

Offline bryanj

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Re: 500 to 550 transplant
« Reply #6 on: November 17, 2008, 03:59:28 PM »
complete engines swap easy as long as you use the r/h rear mounting plate from the 550.
Cylinders only sometimes do and sometimes dont fit depending on how big Honda bored the holes in the crankcase
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline TonyDanger

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Re: 500 to 550 transplant
« Reply #7 on: November 17, 2008, 06:02:02 PM »
I'm working on something similar, but I'm stuffing a 79 CB650 engine in my 71 CB500 frame. Its gonna be a beast!
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