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Author Topic: 550 motor into 500 frame?  (Read 889 times)

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Offline bikeboy

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550 motor into 500 frame?
« on: November 01, 2013, 03:58:07 AM »
Hi guys. Tried the search but didn't throw up any definitive answers, so I'll ask directly. Is the 550 motor into a 500 frame a straight swap? Might have the opportunity to pick up a fairly complete 500, but the motor is seized. There's also a running 550 motor going from another source, and I thought I might be able to combine the two?

cheers
ian
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Offline calj737

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Re: 550 motor into 500 frame?
« Reply #1 on: November 01, 2013, 04:38:15 AM »
Should not be a problem to put a 550 into a 500
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'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline brooze72

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Re: 550 motor into 500 frame?
« Reply #2 on: November 01, 2013, 05:55:50 AM »
Been done, also a 650 in a 500 frame, try searching some more.
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1972 CB500K1 - restored rider
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Offline Scott S

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Re: 550 motor into 500 frame?
« Reply #3 on: November 01, 2013, 08:43:10 AM »
 You need one 550 specific engine bracket on the RH side that has a guide/holder for the clutch cable and the 550 specific clutch cable. Other than that, everything else is the same.
 If you look closely in this pic, it is the unpainted bracket just in front of the kicker. It should be left unpainted or grind off a spot where it touches the frame, as the ground cable attaches with the same bolt.

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Offline SohRon

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Re: 550 motor into 500 frame?
« Reply #4 on: November 01, 2013, 11:01:06 AM »
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"He slipped back down the alley with some roly-poly little bat-faced girl..."

Assembling my '74 CB550: http://forums.sohc4.net/index.php?topic=86697.0
Assembly of the Right-hand Switch (a rebuilder's guide):  http://forums.sohc4.net/index.php?topic=80532.0
Installing stock 4X4 exhaust: CB500-CB550 K: http://forums.sohc4.net/index.php?topic=82323.0
CB550 Assembly Manual: http://forums.sohc4.net/index.php/topic,151576.0.html

Offline dave500

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Re: 550 motor into 500 frame?
« Reply #5 on: November 01, 2013, 12:56:34 PM »
also the type one carbs you have on your 500 use them if the 550 your looking at has the later pd carbs,the first 550s were exactly that,a 550 in the 500 frame,heres those brackets side by side.
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Offline bikeboy

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Re: 550 motor into 500 frame?
« Reply #6 on: November 01, 2013, 06:22:11 PM »
excellent info. Thanks guys.

cheers
ian
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