CB360 Partial Engine Rebuild - Chicagoland Sportbikes
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post #1 of 31 (permalink) Old 08-16-2009, 09:16 PM Thread Starter
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CB360 Partial Engine Rebuild

So I picked up a CB360G parts bike a week or two ago and I have been in the process of taking it apart and putting all the parts in their respective baggies, as a sort of "just in case" measure in case my CB360 cafe racer has an "incident" since parts for it are very scarce. Lately I have been pretty bored and I reduced it to the motor and frame, so I began a teardown of it, with plans to rebuild the top end little by little...

Here are some progress pics:











Cam Guide was broken in 1/2 and incredibly worn. Unfortunately parts like this are few and far between. I will have to scour eBay religiously for a used one in good condition.
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post #2 of 31 (permalink) Old 08-16-2009, 09:19 PM Thread Starter
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I was bored, nothing on TV and gf was packing for college...back to "work"...the head had to go


Nasty buildup on the pistons




Valves look stellar no? haha
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post #3 of 31 (permalink) Old 08-16-2009, 09:21 PM Thread Starter
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Thoughts on next step forward:
1. Find cam chain guide 2. Get CB360 gaskets 3. get cylinders/pistons/valves done professionally 4. clean or sand/soda blast what I can
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post #4 of 31 (permalink) Old 08-16-2009, 10:29 PM

 
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I'd bet the cyl. only needs a hone and new rings.Clean and lap in the valves.

Gus
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post #5 of 31 (permalink) Old 08-17-2009, 12:44 AM
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If you do not replace the pistons, at least clean the carbon off of them. I was working on a car that had a misfire due to a faulty injector. The person let it go so long, it ran like shit because of the carbon on the piston. I pulled the head, brought that cyl to tdc and used a 3m sanding/wheel. Vacuumed it, replaced the head, and it ran perfect afterwards.
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post #6 of 31 (permalink) Old 08-17-2009, 06:15 AM Thread Starter
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Gus and Dave, how should I be cleaning the pistons and cylinders? Use high grit sandpaper? If it is just something like this I can prolly do it myself
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post #7 of 31 (permalink) Old 08-17-2009, 06:18 AM
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I used an air angle grinder and a few 3m pads (start on a polishing bit, the one I used had little fingers on it, like tentacles). Did you happen to do a lead down before you tore the engine apart?
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post #8 of 31 (permalink) Old 08-17-2009, 09:19 AM Thread Starter
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Unfortunately no. The most I did was a compression test, and it read 125-130 each.
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post #9 of 31 (permalink) Old 08-17-2009, 12:21 PM

 
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Those are good #'s they sure would not cause a running an issue.

It's all about the wrench time anyway.just don't get carried away.Use a wire brush and a scraper.

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We offer three kinds of service @ Resurrection
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I'd love to help but I don't chase parts.
Please contact other forum members and supporters for parts.
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post #10 of 31 (permalink) Old 08-17-2009, 12:56 PM Thread Starter
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FYI this is the parts bike engine. I am doing "exploratory surgery" just for learning purposes so I don't mess up my running engine
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post #11 of 31 (permalink) Old 08-17-2009, 06:47 PM Thread Starter
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I am going to be removing the cylinders now. The service manual makes it look like a piece of cake, but mine won't budge. I want to ask around before I do something stupid like taking a chisel and hammer to it
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post #12 of 31 (permalink) Old 08-17-2009, 06:57 PM Thread Starter
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Nevermind, got it
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post #13 of 31 (permalink) Old 08-17-2009, 08:00 PM Thread Starter
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Yep I whacked it a few times with a hammer and it seemed to get unstuck and then it somewhat slid off.



Pistons rested on these rags as they fell out


One out:


Other one out too:


Stopping here. Might as well be a sign: "Abandon Hope All Ye Who Enter Here"


I say that now, but who knows what I will be up to next time around
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post #14 of 31 (permalink) Old 08-18-2009, 12:35 AM

 
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Pull staight up and down on the rod .

Gus
We offer three kinds of service @ Resurrection
GOOD - CHEAP - FAST
You can pick any two
GOOD service CHEAP won't be FAST
GOOD service FAST won't be CHEAP
FAST service CHEAP won't be GOOD
and cold beer.

I'd love to help but I don't chase parts.
Please contact other forum members and supporters for parts.
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post #15 of 31 (permalink) Old 08-18-2009, 06:28 AM Thread Starter
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Quote:
Originally Posted by resurrection View Post
Pull staight up and down on the rod .
?
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post #16 of 31 (permalink) Old 08-18-2009, 06:34 AM

 
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ya that's right up and down (check for bearing play)you dirty *ucker

Gus
We offer three kinds of service @ Resurrection
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You can pick any two
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GOOD service FAST won't be CHEAP
FAST service CHEAP won't be GOOD
and cold beer.

I'd love to help but I don't chase parts.
Please contact other forum members and supporters for parts.
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post #17 of 31 (permalink) Old 08-18-2009, 06:35 AM
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I think Gus is saying check for play in the bearing. Pull it up and down and see if it moves.
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post #18 of 31 (permalink) Old 08-18-2009, 06:36 AM
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Haha. Gus beat me to it.
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post #19 of 31 (permalink) Old 08-18-2009, 06:46 AM Thread Starter
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post #20 of 31 (permalink) Old 08-18-2009, 09:58 PM Thread Starter
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Alright, based on some initial inquiries, it looks like sandblasting is baaaaaad, and I should look into blasting using glass beads or soda blasting. Anyone know of any local hookups?
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post #21 of 31 (permalink) Old 08-18-2009, 11:19 PM

 
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I have a little blaster I use in a box.

Buy the media you want and come use it.

Gus
We offer three kinds of service @ Resurrection
GOOD - CHEAP - FAST
You can pick any two
GOOD service CHEAP won't be FAST
GOOD service FAST won't be CHEAP
FAST service CHEAP won't be GOOD
and cold beer.

I'd love to help but I don't chase parts.
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post #22 of 31 (permalink) Old 08-19-2009, 06:17 AM Thread Starter
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Quote:
Originally Posted by resurrection View Post
I have a little blaster I use in a box.

Buy the media you want and come use it.
BWAHAHAHA! Lets hope that you didn't open the floodgates!

j/k thanks Gus. I will let you know when I am ready...might not be for a while

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post #23 of 31 (permalink) Old 08-19-2009, 07:28 AM
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The 360 engine is perfect for that bike. But... What if you bored and stroked that engine? Have you researched it? IIRC you have 400 carbs, so jetting them should be all that you have to do as far as fuel.
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post #24 of 31 (permalink) Old 08-19-2009, 10:11 AM Thread Starter
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Haha I don't know...I don't want to sink in that much $$$ into this one.
Now that I think about it, I don't really know if I want to rebuild it if I plan to use if for "just in case" parts anyways. Maybe just clean it up and have it sit in baggies and boxes in the basement...

BTW I found a Harbor Freight retail store not too terribly far away with soda blast media and glass beads to use as ammo for Gus' setup!
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post #25 of 31 (permalink) Old 08-19-2009, 10:29 AM
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Besides cost, the only other drawback on building up an engine is you can take reliability out of it. Then the fun factor per dollar drops. I also think it's funny how you, Gus, and myself are the only ones replying in this thread.
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post #26 of 31 (permalink) Old 08-19-2009, 10:43 AM Thread Starter
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Haha thats a good point! Most people I know aren't into bikes that are older than themselves.
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post #27 of 31 (permalink) Old 08-19-2009, 08:58 PM Thread Starter
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Hey Gus,
is it better to media blast the entire engine "put together" or individual pieces? I am concerned about accidentally wearing away important stuff like the cylinders and whatnot.
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post #28 of 31 (permalink) Old 08-19-2009, 09:15 PM Thread Starter
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Next question:

I am removing all the internal goodies. Rockers were easy, now its time for the valves and valve springs. Sr. Manuel says that I need to use a valve spring compressor tool to compress the springs, take out the cotters, spring and valve. I am looking at the picture and it basically looks like a normal C Clamp with a weird attachment. Is there a DIY tool I can make to do this?
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post #29 of 31 (permalink) Old 08-19-2009, 09:33 PM

 
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As for blasting it's all about clean up afterwards I can't argue with assembled or not I guess if it's all together nothing should get in.If it's apart you better clean it well.

Damage to the cyl. will only happen if your ham fisted with the gun.

Gus
We offer three kinds of service @ Resurrection
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You can pick any two
GOOD service CHEAP won't be FAST
GOOD service FAST won't be CHEAP
FAST service CHEAP won't be GOOD
and cold beer.

I'd love to help but I don't chase parts.
Please contact other forum members and supporters for parts.
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post #30 of 31 (permalink) Old 08-19-2009, 09:35 PM

 
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https://www.chicagolandsportbikes.com...ve+spring+tool

Gus
We offer three kinds of service @ Resurrection
GOOD - CHEAP - FAST
You can pick any two
GOOD service CHEAP won't be FAST
GOOD service FAST won't be CHEAP
FAST service CHEAP won't be GOOD
and cold beer.

I'd love to help but I don't chase parts.
Please contact other forum members and supporters for parts.
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