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Author Topic: Cleaning intake and exhaust ports  (Read 2472 times)

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Offline fmctm1sw

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Cleaning intake and exhaust ports
« on: April 20, 2008, 04:22:21 PM »
What is the most cost effective way to clean these up?  I'm not going for a full porting job or anything, I just figured I'd clean it up while it's all apart...

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This is not a pod thread
This is not a #$%* on my vacuum gauges thread
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1973 CB350F
1973 CB350G
1975 CB550K
1983 GL650I
1973 CB750K3 (http://forums.sohc4.net/index.php?topic=92888.0)
1984 Kawasaki KLT-250 (AKA 3 wheeler of death)
1994 Honda TRX300
1999 Honda TRX250

Offline MRieck

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Re: Cleaning intake and exhaust ports
« Reply #1 on: April 20, 2008, 06:07:36 PM »
 Bead blasting is what I use. Put bolts in all the blind holes.
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Offline mattcb350f

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Re: Cleaning intake and exhaust ports
« Reply #2 on: April 20, 2008, 07:14:32 PM »
Those ports are just asking to be ported out  8)

come ooooon  ;D, you've already got the head off


just kiddin'  +1, bead blasting's the best but if you don't have one handy, scrape the hard stuff off with a tool of some sort but be careful, the aluminum is easily gouged. Finish up with some scotchbrite and some brake cleaner (wear gloves) or degreaser. My new favorite cleaning tool is a toothbrush. cheap and work well but they may not fit in them little ports.

 Matt.
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1974 CB350F,  1980 CB125S,  1981 XL80S
Non Honda's: 86 & 87 Husqvarna 400wr's

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Offline mystic_1

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Re: Cleaning intake and exhaust ports
« Reply #3 on: April 20, 2008, 07:19:01 PM »
Low-fume EZ-Off works pretty well to loosen the baked on carbon.  Don't leave it one too long (like overnight) cause it will discolor the aluminum and you'll have to clean THAT off.  A couple of hours, brush with a BRASS brush (so as to not scratch the aluminum) and rinse.

mystic_1
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Offline 75750SS

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Re: Cleaning intake and exhaust ports
« Reply #4 on: April 20, 2008, 08:58:01 PM »
I use a brass cleaning brush, the kind used to clean a shotgun (cheap).  Attach it your drill use compressed air to clean out the dust.  Careful the first time you blast it with air.  A lot dust will blow out.
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Offline 75750SS

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Re: Cleaning intake and exhaust ports
« Reply #5 on: April 20, 2008, 09:00:38 PM »
Forgot to mention, get a smaller gauge for the smaller tight spots.
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