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Author Topic: Cb360 piston rusted and stuck in cylinder  (Read 511 times)

Offline SONIC.

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Re: Cb360 piston rusted and stuck in cylinder
« Reply #10 on: Jul 30, 2017, 13:18:37 »
Chances are good that if the cylinders are that bad, the bottom end is in rough shape as well. You'll likely need new bearings and at least a very thorough rebuild.

Offline irk miller

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Re: Cb360 piston rusted and stuck in cylinder
« Reply #11 on: Jul 30, 2017, 13:49:11 »
Those chambers are toast.  I don't think the head is usable anymore.  Did that motor sit without carbs or something?  Good chance the whole damn thing was full of water. 

Offline crazypj

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Re: Cb360 piston rusted and stuck in cylinder
« Reply #12 on: Jul 30, 2017, 16:59:12 »
Chances are good that if the cylinders are that bad, the bottom end is in rough shape as well. You'll likely need new bearings and at least a very thorough rebuild.

Surprisingly, the corrosion in cylinders often 'protects' lower end of motor from further damage. May be a little rust on edge of flywheel but all the bearings, crank and transmission should be good. Don't scrap block, it's ideal candidate for 378cc conversion or liner replacement (plenty of people have similar damaged blocks, make 1 good from 2 'bad' use damaged liners for 378 motor)
 Pull valves out of head, if seats ain't too rusty to be re-cut it will clean up OK. If cam bearings are good it's worth salvaging even if it needs a new valve seat fitted
« Last Edit: Jul 30, 2017, 17:00:56 by crazypj »
'you can take my word for it or argue until you find out I'm right'
I gave my girlfriend an orgasm the other night, but, she spat it back at me
 Some humans would do anything to see if it was possible to do it. If you put a large switch in some cave somewhere, with a sign on it saying 'End-of-the-World Switch. PLEASE DO NOT TOUCH', the paint wouldn't even have time to dry
 Itís not worth doing something unless someone, somewhere, would much rather you werenít doing it  (Terry Pratchett)
CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline stubsryan

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Re: Cb360 piston rusted and stuck in cylinder
« Reply #13 on: Jul 30, 2017, 23:40:46 »
Awesome advice guys! So a whole lot of effort later I got the cylinders off. Man that was difficult what it is.


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Offline stubsryan

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Re: Cb360 piston rusted and stuck in cylinder
« Reply #14 on: Jul 30, 2017, 23:43:38 »



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Offline stubsryan

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Re: Cb360 piston rusted and stuck in cylinder
« Reply #15 on: Jul 30, 2017, 23:48:31 »
So I have been looking for a replacement engine. I can't find a cb360 engine at all in Australia. Even the motorcycle wreckers don't even have them. Maybe the 360 was a limited release in Aus. Thought about fitting a cb350 twin but again they are rare. One guy wanted $1000. It's annoying because on eBay there is a cb360 engine complete for $275 but it's in America! I'm going to try and fix this one up. So another issue is a spark plug broke in the head. I thought oh ok I will use an easy out. Well that snapped off in the plug! Damn it! I will get it but damn that's annoying


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Offline stubsryan

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Re: Cb360 piston rusted and stuck in cylinder
« Reply #16 on: Jul 30, 2017, 23:50:08 »



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Offline crazypj

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Re: Cb360 piston rusted and stuck in cylinder
« Reply #17 on: Aug 01, 2017, 17:07:33 »
Easyouts SUCK.
The only time they work, you didn't need it anyway.
I've always found the wedging action forces tin sections even tighter into 'whatever'
Get a small punch and drift out plug centre then use a 7/16"drill (all from combustion chamber side.)
As for fixing up engine, not a problem as everything below piston looks good.
Even if you do have to get a pair of valves it will  probably still be way cheaper than a full engine shipped from USA (shipping may be more than cost of motor?)
Either get a cylinder block and piston set or just have it bored for Suzuki GS850 pistons (69mm)
You may have some luck getting Suzuki pistons in Oz as they were way more popular than CB360's
I know Suzuki had 0.50mm oversize pistons available a few years ago but stock have not been available from Suzuki since 2010. Plenty of people with no experience have done 360 motors so you shouldn't have many real issues
'you can take my word for it or argue until you find out I'm right'
I gave my girlfriend an orgasm the other night, but, she spat it back at me
 Some humans would do anything to see if it was possible to do it. If you put a large switch in some cave somewhere, with a sign on it saying 'End-of-the-World Switch. PLEASE DO NOT TOUCH', the paint wouldn't even have time to dry
 Itís not worth doing something unless someone, somewhere, would much rather you werenít doing it  (Terry Pratchett)
CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline stubsryan

  • Posts: 23
Re: Cb360 piston rusted and stuck in cylinder
« Reply #18 on: Aug 02, 2017, 13:03:20 »
Easyouts SUCK.
The only time they work, you didn't need it anyway.
I've always found the wedging action forces tin sections even tighter into 'whatever'
Get a small punch and drift out plug centre then use a 7/16"drill (all from combustion chamber side.)
As for fixing up engine, not a problem as everything below piston looks good.
Even if you do have to get a pair of valves it will  probably still be way cheaper than a full engine shipped from USA (shipping may be more than cost of motor?)
Either get a cylinder block and piston set or just have it bored for Suzuki GS850 pistons (69mm)
You may have some luck getting Suzuki pistons in Oz as they were way more popular than CB360's
I know Suzuki had 0.50mm oversize pistons available a few years ago but stock have not been available from Suzuki since 2010. Plenty of people with no experience have done 360 motors so you shouldn't have many real issues
Thanks mate. I'm going to take the valves out and then decide what I should do. If they are ok then I will fix the stuck spark plug and move on to new pistons etc. worst case I can get a new second hand head with valves for $160 or so. The cylinders need boaring and new pistons with rings anyway so maybe the 69mm pistons will work well. Can't remember what I have at the moment, the bore size was 67 maybe? Anyway, will sort that out later. I have two projects on the go at the moment, got a Cb350f so funds are spread thin over two builds! Thanks for the advice


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Offline crazypj

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Re: Cb360 piston rusted and stuck in cylinder
« Reply #19 on: Aug 02, 2017, 17:51:57 »
Back in 'the good old days, we had to re-profile masonry drill bits to cut through high carbon steel. Easyouts ain't too bad to fix, snapped taps are much harder as they are tool steel. Taday, things are 'easy', get diamond coated burrs and 'Dremel' through just about anything  ;)
'you can take my word for it or argue until you find out I'm right'
I gave my girlfriend an orgasm the other night, but, she spat it back at me
 Some humans would do anything to see if it was possible to do it. If you put a large switch in some cave somewhere, with a sign on it saying 'End-of-the-World Switch. PLEASE DO NOT TOUCH', the paint wouldn't even have time to dry
 Itís not worth doing something unless someone, somewhere, would much rather you werenít doing it  (Terry Pratchett)
CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0