Cleaning Valves

Let talk about valves…

As you can see in the below picture, my cb450 valves were all sorts of f’ed up.

We determined that the piston must have burned up a hole in itself and the aluminum burned onto the valves? I guess? I could not get the shit off no matter what I tried.

Remember this is an extra head I got on eBay so I really didn’t know the condition.

So, Ricky had a tip to get the shit off the valves. He suggested muriatic acid to burn the aluminum off of the steel valves. It def worked great. Thanks Rick. Took a while and pretty sure I have cancer now from the fumes, but the valves seriously look like mint NOS valves after a quick run on the wire wheel.

They should lap in great now.

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6 responses to “Cleaning Valves”

  1. keitH says:

    my, what big valves you have 😉

  2. Shawn F. says:

    Its frequently lead that is built up on valves like that, especially the hot exhaust valve. You have to remember that for the first 15 or so years of the bikes life it ate only leaded gas! I had the same problem getting all that crap off the valves on my CB450 as well.

  3. Aaron says:

    Ricks the man!

  4. Dan says:

    Ed, is there a way to see these in COLOR? I think there was but now I cant find it

  5. ed says:

    @dan
    nah, i rarely upload color photos

  6. Sean says:

    Brother, your site rocks! I just picked up a 74 cb450 and am dealing with all of the above! Thank you! Keep up the great work!

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Published - Apr 30, 2016

Mar Automotive

There are certain things you can do yourself and there are certain things you should leave to the experts with the real tools. I’ve lapped valves before. It’s cool to play around with doing that for fun, but really… let the experts make sure your head is legit. Mar automotive is an engine machine shop […]