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Old 10-15-2005, 10:16 AM   #1
Crush OP
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Restoring an R75

I am in the process of restoring / rebuilding an R75/6 and need a little direction on refinishing the engine and transmission cases and other unpainted aluminum castings. The castings are dirty from years of use and have the associated aluminum tarnish. I know I can clean it up to looking like new, but how do I keep it looking nice? Any suggestions?
TIA, Dennis
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Old 10-15-2005, 12:16 PM   #2
Team Dennis
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Etching mag wheel cleaner should get it clean but keeping it clean is a whole different can of worms.
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Old 10-15-2005, 12:27 PM   #3
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I've seen Airheads that had silver paint rubbed into their pores with scotchgard pads - pretty impressive to look at, if you're into making your bike look purdy.
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Old 10-15-2005, 05:25 PM   #4
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Use of kerosene, as your regular choice of cleaning agent on the motor will keep it very nice and clean for years and years. Will also keep the bugs down around the driveway.

I would worry about using paint, as recommended above. Once you do that, even glass beading may not remove the paint due to the porous nature of the casting.
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Old 10-15-2005, 05:30 PM   #5
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Quote:
Originally Posted by gsweave
Use of kerosene, as your regular choice of cleaning agent on the motor will keep it very nice and clean for years and years. Will also keep the bugs down around the driveway.
Agree,Kero kept my R80's jugs and case looking fine. Applied with old toothbrushes and rags.
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I would worry about using paint, as recommended above. Once you do that, even glass beading may not remove the paint due to the porous nature of the casting.
I didn't say it was good for the engine, just that it was pretty to look at. If that's what someone's after... I wouldn't want anything adding thermal resistance to the parts that need to shed heat.
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Old 10-15-2005, 08:46 PM   #6
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This may sound strange, but I had excellent results when restoring my SWMBO's R75/5 and with removing a bunch of surface corrosion from a later R100 engine with WD-40, green ScotchGuard pads and elbow grease. A couple benefits: a not very aggressive combination (better too little than too much at first), and leaves a bit of a protective coating behind from the WD-40.
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Old 10-15-2005, 08:52 PM   #7
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Quote:
Originally Posted by mneblett
This may sound strange, but I had excellent results when restoring my SWMBO's R75/5 and with removing a bunch of surface corrosion from a later R100 engine with WD-40, green ScotchGuard pads and elbow grease. A couple benefits: a not very aggressive combination (better too little than too much at first), and leaves a bit of a protective coating behind from the WD-40.

Yah man, the dude who was keeping his R90/6 in my garage spent many a night with wd40 and fine steel wool.. Cleaned it up nice..
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Old 10-16-2005, 06:43 AM   #8
gsweave
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Quote:
Originally Posted by mneblett
This may sound strange, but I had excellent results when restoring my SWMBO's R75/5 and with removing a bunch of surface corrosion from a later R100 engine with WD-40, green ScotchGuard pads and elbow grease. A couple benefits: a not very aggressive combination (better too little than too much at first), and leaves a bit of a protective coating behind from the WD-40.
WD is great choice. Kerosene is sold at 1.59 per gallon. Same results, I am frugal.
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Old 10-16-2005, 09:03 AM   #9
KL5A
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Quote:
Originally Posted by gsweave
Kerosene is sold at 1.59 per gallon.
I'd suspect that kerosene has gone up a bit lately. A fiver here is $30, up from $20 last winter.
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Old 10-21-2005, 08:09 AM   #10
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Thumb

A good soak in molasses will clean them to start with. Then its up to you
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Old 10-21-2005, 09:35 AM   #11
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Quote:
Originally Posted by Gramps
Yah man, the dude who was keeping his R90/6 in my garage spent many a night with wd40 and fine steel wool.. Cleaned it up nice..
When I was researching how to clean up the engine, someone mentioned that steel wool shouldn't be used because it can leave behind minute bits of steel imbedded in the aluminum, which later rust. I have no idea whether that's true, but I avoided the issue by using the Scotchbrite pads,
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