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Author Topic: Valve guid o-ring replacement  (Read 1363 times)

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Offline gbal06

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Valve guid o-ring replacement
« on: July 10, 2019, 10:43:49 AM »
Is there a way to remove the o-ring (91301-200-000) from the valve guide on 78 CB550K without removing the guide?  I plan on powder coating the engine and I don’t think the seal will hold up to the curing process.  Any advice?  If I knock out the guide what should I be aware of/look out for?  Thanks
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Offline Bankerdanny

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Re: Valve guid o-ring replacement
« Reply #1 on: July 10, 2019, 01:16:58 PM »
If the seal can hold up to the temperature of a running engine I don't see why it can't stand up to a curing oven.
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Offline gbal06

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Re: Valve guid o-ring replacement
« Reply #2 on: July 10, 2019, 01:25:12 PM »
the curing temp is anywhere from 325-400 for up to 20 mins.  Think it will hold?
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Offline bryanj

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Re: Valve guid o-ring replacement
« Reply #3 on: July 10, 2019, 01:53:12 PM »
The only way to get it out is remove the guides, which normaly means new guides and always means the valve seats need remachining, all expensive
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Offline trigger

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Re: Valve guid o-ring replacement
« Reply #4 on: July 10, 2019, 02:49:37 PM »
It is a silicone 0 ring, it can take the heat. I cure at 240c with no problems whatsoever  ;)
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Offline gbal06

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Re: Valve guid o-ring replacement
« Reply #5 on: July 10, 2019, 03:42:19 PM »
stupid follow up ?. Should I remove the valves, springs etc or just tape up and cover the non PC area?
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Offline trigger

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Re: Valve guid o-ring replacement
« Reply #6 on: July 10, 2019, 11:41:28 PM »
Quote from: gbal06 on July 10, 2019, 03:42:19 PM
stupid follow up ?. Should I remove the valves, springs etc or just tape up and cover the non PC area?

You remove everything from the head apart from the valve guides and valve seats  ;)
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Offline gbal06

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Re: Valve guid o-ring replacement
« Reply #7 on: July 11, 2019, 06:03:28 AM »
great thanks for the help guys!
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Offline Bankerdanny

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Re: Valve guid o-ring replacement
« Reply #8 on: July 11, 2019, 08:40:13 AM »
Quote from: trigger on July 10, 2019, 11:41:28 PM
Quote from: gbal06 on July 10, 2019, 03:42:19 PM
stupid follow up ?. Should I remove the valves, springs etc or just tape up and cover the non PC area?

You remove everything from the head apart from the valve guides and valve seats  ;)

Make sure that you store everything so that when you reassemble the valves and other parts go back on the same cylinder they came from. I would take the time to lap the valves too when assembling.
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Offline HondaMan

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Re: Valve guid o-ring replacement
« Reply #9 on: July 11, 2019, 07:36:07 PM »
Ummm...why are you powder-coating the engine? Is this a show-only bike? That will seriously raise the operating temperature of this engine...
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