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Author Topic: cb550 vs cb650 valve springs... COIL BINDING?  (Read 709 times)

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Offline alacrity

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cb550 vs cb650 valve springs... COIL BINDING?
« on: June 16, 2016, 08:08:46 PM »
Common midrange improvement trick = run cb650 cam in otherwise stock cb550.

Anybody ever compare the valve springs to determine if it's possible that running a cb650 cam in a cb550 could cause coil bind? 

Anybody have some (good/stock/OEM) cb650 valve springs who can measure them for me? How many coils, diameter of coil wire, height uncompressed and height at the bind point (inner and outer?)

Thanks
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I recently restored and sold a 77 cb750f, and am nearly finished with a (former basket case) cb750k5.  This is a place to share, learn and enjoy.  I am grateful to and for 99+% of this site's membership.

Offline Flyin900

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Re: cb550 vs cb650 valve springs... COIL BINDING?
« Reply #1 on: June 16, 2016, 08:18:15 PM »
Check the parts fiche to see if they both use the same parts in their respective motors.

The 1980's CB 900 DOHC cams are a direct swap out for a CB 750 DOHC set up for the same performance upgrade and I have never heard of an issue with that swap.
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Common sense.....isn't so common!

1966 CL77 - 305cc - Gentleman's Scrambler
1967 CL175K0 - Scrambler #802 engine
1972 CB350F - Candy Bacchus Olive - Super Sport
1973 CB350F - Flake Matador Red - Super Sport
1975 CB400F - Parakeet Yellow - Super Sport
1976 CB400F - Varnish Blue - Super Sport
1976 GL1000 - Goldwing Standard
1978 CB550K - Super Sport
1981 GL1100 - Goldwing Standard
1982 CM450A - Hondamatic
1982 CB900C - Custom
1983 CX650E - Eurosport
1983 CB1000C - Custom X 2 Bikes now - both restored
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1984 GL1200 - Goldwing Standard

Offline alacrity

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Re: cb550 vs cb650 valve springs... COIL BINDING?
« Reply #2 on: June 16, 2016, 08:29:58 PM »
cb650 valve springs: 
   010   SPRING, VALVE
14751-383-003      $11.38   $8.51
   011   SPRING, VALVE
14761-383-003   

cb550
   009   SPRING, VALVE
14761-324-000 (replaces 14761-107-010)   008   
   009   SPRING, VALVE
14761-324-000
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I recently restored and sold a 77 cb750f, and am nearly finished with a (former basket case) cb750k5.  This is a place to share, learn and enjoy.  I am grateful to and for 99+% of this site's membership.
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