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Author Topic: CB650 vs CB550 oil pump  (Read 2038 times)

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Offline cafe75-550

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CB650 vs CB550 oil pump
« on: November 08, 2006, 03:49:46 PM »
Does anyone know what the differences are between the 650 and 550 oil pump? I noticed that in the post on Dr. Tom's hybrid AHRMA 650/550 he's running a 650 oil pump with his 550. Is the output higher? Thanks!
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Offline cb650

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Re: CB650 vs CB550 oil pump
« Reply #1 on: November 09, 2006, 04:49:14 AM »
Dont know but have a couple 650 pumps laying around.




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Offline bryanj

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Re: CB650 vs CB550 oil pump
« Reply #2 on: November 09, 2006, 08:10:42 AM »
Not 100% sure but i think the 650 is the same and is what is available now. having said that i do have in my possesion an oil pump that has an extra oil feed sealed with a small "O" ring on the crankcase surface--unfortunately it came in a bag of bits so i have absolutely no idea what its off, it may be 650 as there was a 650 crank and 650 cylinder with pistons with it, both these are now with Ted Hayes for one of his specials! Also the rotors are identical to 500/550
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Offline paulages

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Re: CB650 vs CB550 oil pump
« Reply #3 on: November 09, 2006, 09:21:51 AM »
i'll have to examine them, but i believe they are the same.
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Offline cafe75-550

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Re: CB650 vs CB550 oil pump
« Reply #4 on: November 09, 2006, 01:11:36 PM »
Thanks! I have a working 550 pump, was just curious if the 650 had a higher output. If they did then I'd be looking for one, but since the consensus seem to be that they're the same I'll probably just leave it alone....
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New bike!
'07 Triumph Speed Triple 1050
Never enough projects!
'75 CB550 "Cafe", '76 CB550 parts bike
'64 Norton Atlas featherbed/'71 Triumph 750 Triple (Triton project)
'68 BSA Thunderbolt (frame and cases, project in the wings)
'57 Triumph Thunderbird (frame and mostly complete engine)

Offline jt

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Re: CB650 vs CB550 oil pump
« Reply #5 on: November 09, 2006, 01:17:01 PM »
The 650 pump will bolt up ( have done a test fit) the cover on my 500 engine will not go on completly, you will have to make a cut out on the lower side. If you have a 550 maybe you could use a 650 cover. The 650 pump is wider in it's cross section.
JT
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