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Topics - TwiggsiiieS

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CB350/400 / 400-4 Tappet Adjustment using thread pitch

« on: June 05, 2018, 04:57:40 PM »

There was a thread on this but got bogged down with electrical connectors.

Just got down to looking at this idea and can confirm that the tappet screw pitch on my 400/F is 0.5mm.

so 1/10 turn would be good for 0.05mm(2 thou).

Just bought a tappet tool too and is much easier! much!

The tappet screw stops quickly as it touches the valve stem, back it off 1/10 (36°), job done!

Or is it? Anyone see a problem with this?

CB350/400 / Cam chain/ valve timing

« on: May 24, 2018, 01:24:12 PM »

Hi all,
Having issues sorting the dreaded pilot cct, rides best with the air screws almost out (4 Turns)
All stock #40 pilot,#75 main, filter, filter box, Carbs clean.
So decided to check everything Vacuum synced, Ignition timing good etc.

Valve timing:
I assumed that if i were to just detect the movement of say the inlet rocker on 4 I could look at the timing mark through the points plate and see it ~ 5° before the 'T' mark( roughly on the 'F' mark). However it is just before the two advance timing marks! probably about 30° BTDC. Checked it twice! I must misunderstand something?
Is the spec 5 BTDC when the valve is fully open?

So took the rocker cover off to check the Cam Markings. Set crank to 1-4 TDC and the marks on the cam sprocket are almost flush with the casting, if I line them up exactly the fixed timing mark lines up with the left hand edge of the letter 'T', about 2 or 3° ATDC.
Is this chain stretch? I don't think its far enough out to be a link out. Is it too far out?

Great to solve this one thanks in advance.

CB350/400 / Ignition Advance on 2 and 3

« on: April 01, 2016, 08:21:47 PM »

Weird thing tonight, just did the point gaps and static timing, and went well , started her up and checked cylinder 1 with a strobe perfect although the mechanical advance was at the upper end, changed strobe to cylinder 2 and the tickover timing was spot on but the mechanical advance was way past the marks!
How can that be, anyway before I could investigate more my new timing light packed up.
Anyone seen this before?
Steve

CB350/400 / Counter shaft oil seal

« on: March 21, 2016, 03:03:05 PM »

Can anyone tell me if this seal can be replaced without splitting the crankcase, its the one behind the front chain sprocket.
The schematic seem to show a locating pin on the top. Seems like this could be common problem but I can't find any threads, so sorry if I've missed it and thanks in advance. Its a 1978 400f