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Old 10-10-2009, 03:42 PM   #1
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Honda crankcase material?

Hi all, I was just curious as to see what material the crankcase/crankcase cover is made of on an 03 CBR600rr. Mine has a small seperation between the crankcase itself, and the crankcase cover.
I've looked everywhere but can't find the answer. I think that the cover is aluminum and the actual crankcase is magnesium.
Also, I was going to go to Motorcycles Unlimited to get this done and welded today but a buddy of mine told me he'd do it for an 18 pack. One is way cheaper than the other.
Does the crankcase need to be removed before welding? I know the oil must be drained but does it need to be spot free?

Thanks for the help !!!
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Old 10-10-2009, 05:09 PM   #2
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I would remove the cover to avoid any chance of fire or shorting something.

If you decide to weld it with the cover in place, disconnect the battery from the circuit.

Make sure it's clean / free of oil.
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Old 10-11-2009, 03:52 AM   #3
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Thank you sir.
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Old 10-11-2009, 09:40 AM   #4
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Where exactly is it your welding? How big is the crack that your welding up and does the guy who' welding know what he's doing? If its cracked then the crack needs to be mechanically prepped to fix it correct (gouging out the crack and putting the correct surface prep, bevel etc), then weld it up. if the crack is all the way through and he welds it up you will get weld on the inside of the crack (full pen weld which is the proper way to fix it) in which case try to get inside to properly clean the back of the weld lest you get some small weld particle come free and mix with your oil while running the bike.

....of course you can do a quick cheat and just run a small bead on the outside of the case over the crack and it'll work but it may open up again in the future.
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Old 10-12-2009, 03:28 AM   #5
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The leak is directly where the cover meets the body of the crankcase in about a 1-1.5" spot. You visibly cann't see a crack/seperation but I know it's there when I look down at my shoe. BTW the welder is an old buddy of mine I used to work with. He has 15+years of experience, usually welding for oil rig repairs. He's very talented and does multi-thousand dollar jobs where he's employed. Lol I asked him what he would charge me and he just told me an 18 pack or two. (I hope for after he's done)
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Old 10-12-2009, 03:29 AM   #6
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BTW it's on the underside directly above the oil view sight.
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