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Author Topic: Advice Needed: CB550 Exhaust Valves Snapping Shut  (Read 4206 times)

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Offline JWB

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Re: Advice Needed: CB550 Exhaust Valves Snapping Shut
« Reply #50 on: August 30, 2020, 10:58:18 AM »
Received my valve spring compressor yesterday and proceeded to attempt to remove the valves in my 74 550 today.
Once the springs are removed I am assuming the valves should slide out with out much effort.  I am pretty sure I bent every single valve since none of them came easily.  They required more that a couple strong taps with a mallet and a couple had to be driven out with a punch.  I don't see any cracks or breaks in the valve guides, so hopefully I can order all new valves, lap them in and be ok.
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Offline 754

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Re: Advice Needed: CB550 Exhaust Valves Snapping Shut
« Reply #51 on: August 30, 2020, 11:14:40 AM »
You can slip a tube over them and straighten a bit before removal.
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Offline JWB

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Re: Advice Needed: CB550 Exhaust Valves Snapping Shut
« Reply #52 on: August 30, 2020, 11:16:59 AM »
Thanks for the tip 754.
Any suggestions on best place to order a set of valves?
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Offline bryanj

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Re: Advice Needed: CB550 Exhaust Valves Snapping Shut
« Reply #53 on: August 30, 2020, 01:31:45 PM »
Ebay search mate but check the valves by rolling on a flat surface before condeming them, its possible they were tight to remove as the tops can "mushroom" with use which needs grinding off
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Offline JWB

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Re: Advice Needed: CB550 Exhaust Valves Snapping Shut
« Reply #54 on: August 31, 2020, 01:53:39 PM »
Bryan,
Thanks for the tip.  I did as you suggested and was able to get the valves into the guides about 1\2 to 1" before the got tight.  Gave them a couple rotations and the have a definite wobble.   Ugh, more unplanned work.  Oh well, such it the hobby we have taken up.  If it was easy more people would do it.
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Offline bryanj

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Re: Advice Needed: CB550 Exhaust Valves Snapping Shut
« Reply #55 on: August 31, 2020, 03:26:13 PM »
It is very unusual for one fitting of the cover to bend more than 3 valves, perhaps an owner before you did some of the damage and you just got unlucky enough to be stuck with the repair
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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 Scott S

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Re: Advice Needed: CB550 Exhaust Valves Snapping Shut
« Reply #56 on: August 31, 2020, 06:34:42 PM »
Quote from: JWB on August 30, 2020, 10:58:18 AM
Received my valve spring compressor yesterday and proceeded to attempt to remove the valves in my 74 550 today.
Once the springs are removed I am assuming the valves should slide out with out much effort.  I am pretty sure I bent every single valve since none of them came easily.  They required more that a couple strong taps with a mallet and a couple had to be driven out with a punch.  I don't see any cracks or breaks in the valve guides, so hopefully I can order all new valves, lap them in and be ok.

 JWB, PM me. I have some used, stock valves. Maybe not a full set, but enough to help. Might even have a full head.
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Offline bryanj

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Re: Advice Needed: CB550 Exhaust Valves Snapping Shut
« Reply #57 on: August 31, 2020, 08:06:19 PM »
It may be cheaper to get a complete used head and all 500 and 550 heads are identical
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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 MRieck

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Re: Advice Needed: CB550 Exhaust Valves Snapping Shut
« Reply #58 on: September 02, 2020, 05:27:54 AM »
 I really question the condition of the guide bores after you forced the valves out. If there was a lip around the valve tip the bore is ruined.
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Offline JWB

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Re: Advice Needed: CB550 Exhaust Valves Snapping Shut
« Reply #59 on: September 02, 2020, 07:42:04 AM »
Good suggestions everyone.  Considering sending to Hondaman for an evaluation.
Scott, I sent a PM to you.
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