'74 CB 360 Cafe Build - Luna - "Done"!

Re: '74 CB 360 Cafe Build - Boomerang

Running thin on ideas. Like I said, the bike ran with the carbs setup as they are. I'm starting to lean towards a mistake in my reassembly of the top end. Camshaft set to crankshaft at the wrong position (180 degrees off) would cause valve action to be happening at the wrong time on the wrong cylinder. Lemme see if I have a picture of how I set that up. I know I posted it earlier in the thread when I was rebuilding the motor.
 
Re: '74 CB 360 Cafe Build - Boomerang

Found the old post:

adventurco said:
I (think) I've gotten everything lined up correctly:

With LT on the rotor aligned with the mark (TDC "left" piston), the cam chain is set to the camshaft with the marks on the sprocket horizontal.

89bbec76532eadfadaadafeb5c2a8573.jpg

b4ac5f93a388699f4341a7b01a7bac39.jpg


I have read before that in order to set "initial timing" I'll call it, you want to be on the compression stroke (?), or the camshaft could be 180 degrees out of rotation. According to the service manual, I'm doing it right. *shrugs*
Click to expand...


So what if I set the cam chain sprocket at horizontal (as pictured) on the wrong LT mark. Since one full 'revolution' is 720*, the LT position lines up with the mark on the stator twice per.

If this were the case, my spark and piston action would be completely misaligned.

I'm just spitballing here.
 
Re: '74 CB 360 Cafe Build - Boomerang

That's right. LT is Left Top dead center, so the left lobe should be pointing down. Did you take the advancer/points mechanism apart? It's possible you have the points cam reversed.
 
Re: '74 CB 360 Cafe Build - Boomerang

Is the exhaust valvespring on upside down?
You can see the closed coils on intake side
 
Re: '74 CB 360 Cafe Build - Boomerang

adventurco said:
Running thin on ideas. Like I said, the bike ran with the carbs setup as they are. I'm starting to lean towards a mistake in my reassembly of the top end. Camshaft set to crankshaft at the wrong position (180 degrees off) would cause valve action to be happening at the wrong time on the wrong cylinder. Lemme see if I have a picture of how I set that up. I know I posted it earlier in the thread when I was rebuilding the motor.
Click to expand...

Cam CANNOT be '180 out', it turns at half engine speed so can only be on TDCC or overlap
The POINTS CAM CAN be 180 out, search for pictures on correct assembly
Swap the points wires at coil to check
 
Re: '74 CB 360 Cafe Build - Boomerang

Deal with one issue at a time. If you've kicked the engine over a few times and plugs are dry, then you definitely have a fueling problem. Worry about the other stuff after you fix the carbs. Chasing multiple issues at once is a sure path to insanity.
 
Re: '74 CB 360 Cafe Build - Boomerang

I usually do everything at once, but, I've had over 45 yrs experience ;D
 
Re: '74 CB 360 Cafe Build - Boomerang

I usually so everything at once and get it all wrong, and then tell others not to do the same thing. :P

But then again... the only way to make good decisions is to build experience and the only way to build experience is to make bad decisions.
 
Re: '74 CB 360 Cafe Build - Boomerang

I was telling him to try one thing one at a time...its just I was thinking of them 3 things at a time. ;)

Yes, do one thing at a time.
 
'74 CB 360 Cafe Build - Boomerang

One thing at a time, one thing at a time.

So, why am I not getting fuel? Or am I?

Bowls are filling, floats set 18.5, all circuits checked and double checked for blockage. Bench synced. I can't think of any reason there wouldn't be fuel. After kicking her over and pulling the carbs, there IS fuel on the intake manifolds, which leads me
To believe that the carbs SHOULD be working as intended.

Going to check the points cam and advancer since I did disassemble to clean and lube.
 
Re: '74 CB 360 Cafe Build - Boomerang

Fuel in the intake manifolds is a good sign. Next thing to check is fuel in the cylinders. Should smell strongly of gas and the plugs should be wet after half a dozen kicks or so.
 
Re: '74 CB 360 Cafe Build - Boomerang

If you disassembled the advancer...then there ya go. I bet you got the lobe on backwards.
Just make sure Left points open when left piston is on the compression stroke.
 
Re: '74 CB 360 Cafe Build - Boomerang


trek97 said:
If you disassembled the advancer...then there ya go. I bet you got the lobe on backwards.
Just make sure Left points open when left piston is on the compression stroke.
Click to expand...

So - correct me if I'm wrong. left cylinder intake valve compresses then lifts, then at the LT mark following valve lift, THIS is when left point should just be breaking.

If that's the case then I definitely have the lobe on incorrectly.
 
Re: '74 CB 360 Cafe Build - Boomerang

Correct.

Points open just before the top of the compression stroke, when both valves are fully closed. TDC on exhaust/intake stroke will have both valve slightly open (lobes up).
 
'74 CB 360 Cafe Build - Boomerang

YES!

I knew I missed something silly. Flipped the advancer lobe and boy did she fire up.

How long until I should see oil splashing out by the tappet covers? I gave it about 10 seconds and didn't see anything, got scared and killed it.

Noticed a bit of smoke coming off the left cylinder, near the exhaust manifold. Will have to check that the metal 'half moon' are seated properly
 
Re: '74 CB 360 Cafe Build - Boomerang

It can take almost a minute at idle before you see oil. That's part of the reason it's best to fill the oil from the top after a fresh rebuild.
 
Re: '74 CB 360 Cafe Build - Boomerang

did you flush the oil journals throughout the head...and then double flush them just to be sure?

also the teeny weenie feeds through the top case?
oilholemod1.jpg
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'74 CB 360 Cafe Build - Boomerang

Yeah, I flushed everything once twice and three times.

I got my little oil can with the hose in and refilled the top end oil baths after I put the engine back in the frame.
 
Re: '74 CB 360 Cafe Build - Boomerang

and you filled the engine w oil right. may sound silly but guys get excited and can overlook that part. :o
 
'74 CB 360 Cafe Build - Boomerang

Yeah. 2 quarts of Rotella 5w-40.

Trek I owe you a high five for that tip off on the advancer.

And thanks to everyone for all the input.

Now to iron her out
 
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