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Author Topic: Just picked up a cb360. Stuck engine help.  (Read 719 times)

Offline ryan_289

  • Posts: 36
Just picked up a cb360. Stuck engine help.
« on: Jul 11, 2018, 00:09:55 »
I just picked up a 76 cb360 from a guy at work. He claimed he picked it up in a package deal and the engine is stuck.  I got it home tonight and the po had filled the crank case with what smelled like transmission fluid.  I stuck my cord camera down the spark plug holes and they were dry. I filled the cylinders with corrosionx and will rock it around over the next few days. If that doesn't work are there any other suggestions to help unstick it?   Here are a few pics. Excuse the mess, I'm in the middle of a few projects.  My goal is to end up with a tracker/scrambler type bike.  This is my first motorcycle in about 20 years!

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Offline Spoonz

  • Posts: 259
Re: Just picked up a cb360. Stuck engine help.
« Reply #1 on: Jul 11, 2018, 00:43:48 »
If itís stuck, once you get it unstuck you are probably going to need to rebuild the topend at least.

Offline advCo

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Re: Just picked up a cb360. Stuck engine help.
« Reply #2 on: Jul 11, 2018, 02:25:43 »
ATF and acetone 50/50 in the cylinders. Fill em up. Wait a week. See if it turns over. Donít force it either way.

Like spoonz said youíll probably want to rebuild the top end, at the minimum rings and a hone on a stuck motor...so you can just pull the head off, break the jugs free with a rubber mallet or deadblow, place some blocks underneath to raise it off the crankcase and then tap the pistons down with a block of wood.


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"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0 - Sold
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0 - Sold
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0
'97 BMW F650st - http://www.dotheton.com/forum/index.php?topic=75732.0

Offline MiniatureNinja

  • Posts: 480
Re: Just picked up a cb360. Stuck engine help.
« Reply #3 on: Jul 11, 2018, 03:02:35 »
If the engine is stuck, there are bare minimum things that you will need to do... go ahead and pull the motor, take it apart. You can free pistons with a good soak of marvel mystery oil, just let them soak in there for a few days. Rock back and forth gently, motor like to spin counterclockwise but a few degrees back wont hurt it.
'75 Honda CB360 - thread

Offline ryan_289

  • Posts: 36
Re: Just picked up a cb360. Stuck engine help.
« Reply #4 on: Jul 11, 2018, 17:05:59 »
Any recommendations on rebuild threads or videos?  I've never been into a motorcycle engine.

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Offline MiniatureNinja

  • Posts: 480
Re: Just picked up a cb360. Stuck engine help.
« Reply #5 on: Jul 11, 2018, 17:57:20 »
Sderbyshire thread just below yours, pjcrazy tons of info, mine in my signature, trek, there really are a ton of them on this forum alone
'75 Honda CB360 - thread

Offline ryan_289

  • Posts: 36
Re: Just picked up a cb360. Stuck engine help.
« Reply #6 on: Jul 11, 2018, 22:51:31 »
Success!  Went out to the shop and put it in high gear and she broke loose.  Still may need a top end rebuild but now it will be easier to take apart.  I'm going to at least try and get it to fire off first though.

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Offline MiniatureNinja

  • Posts: 480
Re: Just picked up a cb360. Stuck engine help.
« Reply #7 on: Jul 11, 2018, 22:55:31 »
Success!  Went out to the shop and put it in high gear and she broke loose.  Still may need a top end rebuild but now it will be easier to take apart.  I'm going to at least try and get it to fire off first though.

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if the engine was stuck, you run a pretty serious risk of grenading it - it turns over, that's great... is firing it up worth it?
'75 Honda CB360 - thread

Offline trek97

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Re: Just picked up a cb360. Stuck engine help.
« Reply #8 on: Jul 11, 2018, 22:57:45 »
I'm going to at least try and get it to fire off first though.

I would pull the head cover and make sure everything is working smoothly, cam is turning, all valves working, tons of lube...etc.  check valve clearance.
Then fire that thing up.

« Last Edit: Jul 11, 2018, 23:02:38 by trek97 »

Offline ryan_289

  • Posts: 36
Re: Just picked up a cb360. Stuck engine help.
« Reply #9 on: Jul 11, 2018, 23:28:08 »
if the engine was stuck, you run a pretty serious risk of grenading it - it turns over, that's great... is firing it up worth it?
Are motorcycle engines that delicate?  I've unstuck old flathead jeep engines before and fired them off with no issues. Serious question, I've never worked on a small engine.  I guess they are running quite a bit faster than an old jeep with smaller parts to boot!

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