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Topics - Fogdevil

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CB350/400 / Cam lobe position and tappet adjustment

« on: April 22, 2018, 08:41:27 PM »

Just wondering if you could help me get something straight in my head.
I have just timed the camshaft (T1-4 marks correspond,cam sprocket lines parallel with top of barrel,cylinder 4 cam lobes pointing down)
Next job is to fit the head and adjust tappets.
According to the manual you first adjust cylinder 1 tappets at TDC with valves shut. BUT if I leave the camshaft in the same position(as above) the cam lobes are pointing up therefore valves are open.
SO-do I have to rotate crank until cylinder 1 TDC and lobes face down.If so,why does workshop manual(p20) show you cylinder 4 with lobes in down position for timing purposes?
OR-do I adjust tappets at cylinder 4 first and do it the opposite way to the manual
Am I overthinking this?

CB350/400 / Cam sprocket plate

« on: April 22, 2018, 07:40:35 PM »

Have picked up on some posts that people have or have not got a thin metal plate between cam sprocket and the knock bolts.
My knock bolts were not flanged so I wonder if it was a way to spread the loading from the knock bolt to the cam sprocket. [ Guests cannot view attachments ]

CB350/400 / Cam chain taughtness

« on: April 19, 2018, 07:01:10 PM »

Hello all
Having just attached the camshaft sprocket,cam chain and done timing for camshaft I undid the cam chain tensioner nut and setting bolt.
The cam chain is in contact with the cam chain guide at the front and there is a bulge in the chain where the cam chain tensioner slipper is in contact with the cam chain at the rear.
Should there be slack in the chain or should it be relatively taught?
It is difficult to tell but I think I have approx 8mm of movement in the chain between the slipper and the sprocket and there is backwards and forwards motion in the chain.
I have undone the bolt above the cam chain tensioner and the push bar is recessed 12.5mm from the top of the crankcase.
The engine turns freely and the timing stays constant.
I cannot pull the chain in an upwards movement off the sprocket and it stays in place at the crankase when the engine is turned and stationary.
I am sorry but trying to photo the chain is impossible.
I would just like to double check before attaching the cylinder head cover.
Thanks Foggy

CB350/400 / Cylinder stud too short!!

« on: February 18, 2018, 11:01:30 PM »

Hello everybody
After having a fantastic day in the garage I come to the final job of the day-fastening down the cylinder head-only to find that the cylinder stud with the 'open' flanged nut(on the offside) will not grip.I can only assume that the stud has been put in too far.The other open nut/stud is fine.
If I omit the copper washer then it will fasten no problem.
If I use the copper washer with the original nut then it will fasten!(But have now stripped the original nut-and it was pretty grotty anyway).Indicates to me that the shortness of length of the stud is minimal.
I have hand tightened the nuts but just put copperslip under the problem nut for now.
Soooo.Do I:
Torque down the nuts as they are-leaving out the copper washer on the problem stud and assume that Honda overenginering will compensate?
Try to get a thinner copper washer?(Washer thickness 2.3mm)
Try different flanged nuts to see if one will 'grip' the stud.The new nut is original Honda part from DS.

I don't know enough about engineering to know if this is an irritating problem or an oil leak waiting to happen.

I am rather hoping my first suggestion is acceptable as I really,really,really DON'T want to undo all my good work so far.

What is the purpose of the copper washers?

Ta

CB350/400 / Engine needle/ball bearings 400/4

« on: January 26, 2017, 12:56:53 PM »

Hello everyone,
Having got into the guts of the engine and decided to replace all the roller type bearings I have discovered that of the 6 that could be replaced
one is discontinued(part ref 265) and another is prohibitively expensive(part ref 264).
From your collective knowledge,which bearings would NEED to be replaced and, if all of them, can anyone suggest a reputable bearing supplier.
The engine has done approx. 27k
One more question-The damper on the cam chain tensioner(part ref 51) is 1mm thicker on one side than t'other.Does the 'thicker' side go towards the front or back of the engine?
I hope the photo shows it
Cheers
Peter

CB350/400 / valve spring length 400/4

« on: June 07, 2016, 01:01:03 PM »

Hello everyone
Measured the inner and outer valve spring lengths.
All greater than the minimum length advised by mr Honda but only by about 1-1.5mm on all springs.
I don't intend to delve into the bowels again for a long time so would it be better to get new springs?
What is the length of NEW inner and outer springs?
Thanks in anticipation
Fogdevil
PS Struggling to send photos as I can't compress the photo enough

New Member Introductions / Lurking no more!

« on: April 27, 2016, 10:06:52 AM »

Hello everybody
Many years ago when I was 18 and at a party I saw a 400/4 driven through the back door,into the kitchen and then out the front door via the lounge.
Ever since then I thought "that's the bike for me!"
Now I've got one-but the wife says it has to stay in the garage.
My problem is-from the tilted/slewed position I was in at the time, I did not notice which side the rear spindle was inserted from.Brake side as per the parts manual and set up instructions or drive side as per Haynes.
Any help appreciated
Cheers
Fogdevil
PS I think it was a blue 400/4