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Author Topic: Valves  (Read 1010 times)

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redschwa

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Valves
« on: May 05, 2009, 05:23:39 PM »
Okay my valves were tapping so i adjusted them to clymer manual specs, .002 for intake and .003in. exhaust i got it all put back together and fired it up only to hear tapping again. Should i readjust them out  or in? perhaps i have an entirely different problem. Oh I'm working with a cb650sc 1982
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Offline OldSchool_IsCool

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Re: Valves
« Reply #1 on: May 05, 2009, 05:43:50 PM »
Are you getting oil up there?  Take the #1 and #4 exhaust tappet covers off, start the engine and note if any oil splashes out of the holes. 

Have you adjusted the cam chain tension?  Consult your manual for this one.
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ev0lution7

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Re: Valves
« Reply #2 on: May 05, 2009, 05:43:53 PM »
most honda's I work on i set exhaust valves just .001 loose... and some "tapping" is normal..  so on your exhaust i would set them on .004in exhaust..

the real question is how loose were they b4 you started??
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redschwa

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Re: Valves
« Reply #3 on: May 05, 2009, 08:35:17 PM »
well i just adjusted the cam chain tension according to manual before i did the valve adjustment. And before i started the exhaust and intake on 1 and 3 had no movement even at tdc. I didnt measure the others but 4 had movement and its respective valves moved a little too. When i was adjusting them they were covered in oil. I'll try the exhaust at .004 So the more the gap the less tapping?
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Offline bryanj

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Re: Valves
« Reply #4 on: May 05, 2009, 08:47:24 PM »
checx the exhaust gaskets
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ev0lution7

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Re: Valves
« Reply #5 on: May 05, 2009, 08:50:09 PM »
a little loose on the exhaust valves will make a little more noise but they will last longer.... you have to ask yourself ....

do i want a longer lasting motor or a quite one?

its not going to make THAT much more noise i dont notice it on mine or any honda cars i work on for customers but i do know that honda valves run tite and exhaust valves get HOT and that is a BAD combo...
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redschwa

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Re: Valves
« Reply #6 on: May 05, 2009, 08:58:53 PM »
well im concerned that my vaves are way too loud already. It is probably the loudest thing on my bike. But i dont mind loud valves if it isnt bad for the bike.
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ev0lution7

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Re: Valves
« Reply #7 on: May 05, 2009, 09:01:22 PM »
like the othe guy said run the bike and take the tappet covers off and see if there is OIL splashing on them!
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Offline hymodyne

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Re: Valves
« Reply #8 on: May 06, 2009, 04:02:47 AM »
I would re-check the valve adjustments, re-set  cam chain tension, exhaust gasket seating.

hym
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Offline Soos

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Re: Valves
« Reply #9 on: May 06, 2009, 06:32:47 AM »
Quote from: ev0lution7 on May 05, 2009, 05:43:53 PM
  so on your exhaust i would set them on .004in exhaust..


+1

If unsure why, look up hondamans recommendations for the '77/78 cb750/all years of the SOHC cb650......
I have done this on all the 650's I have worked on/owned/fixed for others.


l8r
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