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Author Topic: CB 450 twin. I said I needed a project  (Read 6529 times)

Offline john83

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Re: CB 450 twin. I said I needed a project
« Reply #20 on: Dec 04, 2016, 22:49:54 »
Don't be a tool John. Jb weld may be good enough for airplanes, but don't bring that noise into the custom motorcycle scene, you savage.

Come on man. We are true professionals here in airplane land. We would use a mixture of Liquid Nails, two part epoxy and dirt.

Offline Hurco550

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Re: CB 450 twin. I said I needed a project
« Reply #21 on: Dec 04, 2016, 22:51:02 »


Come on man. We are true professionals here in airplane land. We would use a mixture of Liquid Nails, two part epoxy, chewing gum, twine and dirt

Fixed it

"If you just picked up a drug habbit instead of a kawasaki triple at least you could get high while you waste money"
~ bradj
1988 tw200, the swamp donkey: http://www.dotheton.com/forum/index.php?topic=75455.0
2006 Suzuki DR650 Adventure monowheel trailer build: http://www.dotheton.com/forum/index.php?topic=75033.0
1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"much ingenuity with a little money is more profitable and amusing than much money without ingenuity" - Arnold Bennet

Offline cxman

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Re: CB 450 twin. I said I needed a project
« Reply #22 on: Dec 05, 2016, 07:41:04 »
john

i thought you had to put a coat of zinc chromate on it first
we had to when doing a float repair??
1978 CX650 Super Deluxe
1979 XS1100 Special
1974 xl350
1983 cx650 Custom
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1974 kawasaki 350 bighorn
1983 GL1100 aspy full dress
1983 GL1100 Nekid
and a bunch of others

Offline cardinal

  • Posts: 58
Re: CB 450 twin. I said I needed a project
« Reply #23 on: Dec 06, 2016, 00:10:19 »
While I wait for my cam chain tool to arrive I was wondering if anyone has seen this problem before on one of these engines: It looks like the front (exhaust) lower guide roller somehow came loose and was spinning on the cylinder head till it eventually wore right through and oil shot all over the place. Is this a sign that I'll need to do a complete engine overhaul? Wondering about the aluminum that ended up in the engine...

Thoughts?

« Last Edit: Dec 06, 2016, 00:12:29 by cardinal »

Offline cxman

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Re: CB 450 twin. I said I needed a project
« Reply #24 on: Dec 06, 2016, 08:11:44 »
check the centrifugal filter and see if it caught it

i have welded a few of those up where i just got the head to fix

and other than guides and a chain i dont think they took the bottom end apart

its so easy to split i would not do it without a through clean and inspection
1978 CX650 Super Deluxe
1979 XS1100 Special
1974 xl350
1983 cx650 Custom
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1974 kawasaki 350 bighorn
1983 GL1100 aspy full dress
1983 GL1100 Nekid
and a bunch of others

Offline frogman

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  • '74 CB360, '71 CB450, '75 CB550SS
Re: CB 450 twin. I said I needed a project
« Reply #25 on: Dec 06, 2016, 09:42:53 »
Complete overhaul is based on more than just a hole in the side of the engine, however it would make me take a hard look at most of the oil passages in the crankcase and the head to make sure things aren't plugged up. The oil also passed through the pump prior to getting into the filter so you should certainly take a look at it.

Its worth splitting cases as well, just to make sure your transmission is in good shape. That one shouldn't have the chain oilier and fork issues but its worth looking at.

Offline cardinal

  • Posts: 58
Re: CB 450 twin. I said I needed a project
« Reply #26 on: Dec 09, 2016, 23:52:14 »
got my chain tool and popped the top off. Here's a pic looking into the cylinder head where the wear was. See that piece of metal on the top? It was just hanging out there on that little shelf. It's not aluminum, I picked it with a magnet. Not sure where it came from.

The second pic is the chain tensioner that made the hole. You can see that the bracket that was holding it in place snapped off.

Offline cardinal

  • Posts: 58
Re: CB 450 twin. I said I needed a project
« Reply #27 on: Dec 10, 2016, 02:14:44 »
And after further inspection, you can see that the piece of metal is a missing chunk of the cam wheel bracket. There is a piece missing near the top bolt head in the 2nd pic. Did a search on eBay, they might be hen's teeth.

Offline cxman

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« Last Edit: Dec 10, 2016, 08:48:41 by cxman »
1978 CX650 Super Deluxe
1979 XS1100 Special
1974 xl350
1983 cx650 Custom
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1974 kawasaki 350 bighorn
1983 GL1100 aspy full dress
1983 GL1100 Nekid
and a bunch of others

Offline cardinal

  • Posts: 58
Re: CB 450 twin. I said I needed a project
« Reply #29 on: Feb 20, 2017, 00:43:54 »
I'm still here! I had a busy winter at work with travel and the holidays I haven't had any time to spend on the bike. I did manage to buy a replacement jug and cam guides from jag767 (thanks!). Today I stripped the head down and realized three of the valves are completely bent. So now I'm on the prowl for the least expensive option I can find. I've been going back and forth about whether or not to take the rest of the bike apart and do a full rebuild. It's pretty unlikely I'll have the motor out again any time soon, so I'm thinking I might go ahead and strip the frame and make some adjustments while it's easy. I'll probably add a frame loop and get rid of some of the extra tabs and bumps.