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Polishing or cleaning engine

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28 Jul 2006 05:29 #65401 by spark363
Polishing or cleaning engine was created by spark363
What is the best way to brighten up that old 82 engine of mine. I had a friend liken it to anothers rat hardly. I can't have that! Everything else on the bike looks good, but the engine is pretty crappy looking.

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  • The Gringo
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  • ¡Usted no necesita otra motocicleta!
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28 Jul 2006 07:25 #65408 by The Gringo
Replied by The Gringo on topic Polishing or cleaning engine
Check out this thread it covers this subject pretty well. I just spent the better part of yesterday morning removing the 25 year old "patina" from the sprocket cover on my 81 650 CSR. It is a heck of a lot of work but the results are worth it.

kzrider.com/component/option,com_joomlab...mit,20/limitstart,0/

Post edited by: The Gringo, at: 2006/07/28 10:29

Andy
Akron, Ohio
80 Z-1 Classic-Sold
84 GPZ1100
79 KZ 1000 LTD
78 KZ 1000 A2
77 KZ 1000 LTD-Sold
76 KZ 900 The definition of a barn find
76 KZ 900-Sold gone to Denmark
KZ 750 times 3, KZ 650 times 8 Sold 1 down to 7
KZ 550 times 2 80 440LTD-Sold
81 CSR 305-Sold 81 Yamaha XS650 Special

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28 Jul 2006 22:23 #65578 by reborn650
Replied by reborn650 on topic Polishing or cleaning engine
Hi spark363. Here is what I did to bring a heavily oxidized engine up to near show condition.

I removed the cases and covers and cleaned the oxidization off them with a fine steel wool. Then I used 180 grit wet sandpaper keeping the paper very wet at all times by dipping it into a little container with water in it. I probably spend at least half an hour with the 180 before moving to 320, then 600 and finally 1000 grit fine wet sandpaper. It take time and patience but you will see the metal's finish come back to life very slowly. Wipe the cases off with a dry cloth between each step of wet sanding.

My final stepw were to use Autosol metal polish that I rubbed in by hand. You will notice the more you rub the polish in the dirtier it gets. Finally I used a soft buffing wheel on a drill to bring the cases to a mirror finish.

All total, I spent about 16 hours doing the cases and covers including the valve cover. The fins I had bead blasted because the motor was apart for a rebuild.

Here is a pic of the finished polished motor.

Cheers-Colin Firth-Ontario Canada
'77 Kz 650 Custom/810 Kit and tons of go fast goodies.

Post edited by: reborn650, at: 2006/07/29 01:24

-1977 Kz650 Custom bought new by brother. Now with 810 kit, GPz750 cams, intake valves, Mikuni 29 smoothbores, velocity stacks, Dyna Igntion, MAC pipe and other goodies.
-1982 Ferrari 308 GTSi Red/Tan
-Toyota FJ Cruiser - 6 speed tank
-2010 Mazda CX-7 Turbo (my bride's)
-1998 Jeep TJ Wrangler 4.0...
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