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Author Topic: Backwards valve guides  (Read 891 times)

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Offline BoneDigger

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Backwards valve guides
« on: May 11, 2015, 10:52:13 AM »
Check the photo.  So, I was going to check the springs, tolerances, and lap the valves today in my non-running 1972 CB750 which I have been slowly rebuilding.  Took an intake valve assemble apart and everything looked good.  Cleaned it up, and went on to the exhaust valve.  Had a wtf moment and took all the springs and valves out for a gander at them all...
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Offline kmb69

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Re: Backwards valve guides
« Reply #1 on: May 11, 2015, 10:54:26 AM »
They are not "backwards". The early models did not have seals on the exhaust guides.
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Offline flybox1

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Re: Backwards valve guides
« Reply #2 on: May 11, 2015, 10:58:56 AM »
cool.  heard about them, but this is the first one ive seen.
thx for posting the picture.
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

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Offline BoneDigger

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Re: Backwards valve guides
« Reply #3 on: May 11, 2015, 11:30:41 AM »
Quote from: kmb69 on May 11, 2015, 10:54:26 AM
They are not "backwards". The early models did not have seals on the exhaust guides.

Ah, good to know!  My manual (for early Ks) shows the exhaust guides the other way around with seals.  Perhaps the image is just a generic one used for mid series Ks?
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