CB350 Valve clearance issues...
- Thread starter danfr
- Start date
DrJ
Over 1,000 Posts
First you need to install the cambox cover and torque all the stud nuts to spec, then you can adjust the valve clearances.
Second, both pistons are never at TDC before the power stroke (both valves closed, both rockers loose) at the same time. After you adjust the left rockers, rotate the crank forward until the T lines up with the timing mark. Now the right piston should be at TDC with both rockers loose ready for setting valve clearance.
Second, both pistons are never at TDC before the power stroke (both valves closed, both rockers loose) at the same time. After you adjust the left rockers, rotate the crank forward until the T lines up with the timing mark. Now the right piston should be at TDC with both rockers loose ready for setting valve clearance.
danfr
Been Around the Block
Hey thanks DRJ! I think figured it out
I know both pistons wouldn't be at TDC at the same time. I failed to mention a couple things in the video...
but anyhoo, I discovered that the left piston is at TDC (with both valves closed) when the timing mark on the cam is pointed DOWN and the alternator at LT, which is half way through the two cycle 720 degree rotation it has. My mistake was I was trying to adjust the valves based on having the timing mark on the cam pointed UP and the alt at LT.
My second mistake is that, I was trying to adjust the right piston valves on LT, as opposed to the correct T position.
AND apparently my third mistake is that I need to torque down the cambox cover. I'll be sure to check clearances afterwards.
I know both pistons wouldn't be at TDC at the same time. I failed to mention a couple things in the video...
but anyhoo, I discovered that the left piston is at TDC (with both valves closed) when the timing mark on the cam is pointed DOWN and the alternator at LT, which is half way through the two cycle 720 degree rotation it has. My mistake was I was trying to adjust the valves based on having the timing mark on the cam pointed UP and the alt at LT.
My second mistake is that, I was trying to adjust the right piston valves on LT, as opposed to the correct T position.
AND apparently my third mistake is that I need to torque down the cambox cover. I'll be sure to check clearances afterwards.
did not watch your movie but this may help....easy way to figure out where to set valves is rotate engine in correct direction...if you do not know use this ;it can be found by putting bike in gear(top would be easiest) and rotating wheel in normal direction..
now that you know which way to rotate engine rotate it either with the rear wheel or crankshaft nut/bolt until the intake valve opens and then closes and install a plastic straw (from a squirt bottle) in the plug hole until piston reaches somewhere near top (tdc) look for mark on rotor and then line it up..that is where you your valve..unless it is a vintage british bike which uses a slightly different means..joe@ vcycle
now that you know which way to rotate engine rotate it either with the rear wheel or crankshaft nut/bolt until the intake valve opens and then closes and install a plastic straw (from a squirt bottle) in the plug hole until piston reaches somewhere near top (tdc) look for mark on rotor and then line it up..that is where you your valve..unless it is a vintage british bike which uses a slightly different means..joe@ vcycle
cgguy09
1971 CB350 K3
Hey gents,
I know this topic is a little old...but, my shop manual says after setting the left cylinder : Rotate the engine 180* and allign the "L" timing mark with the stator index... I don't have a "L" on my motorcycle, am I right in assuming its the "T" mark?
and just to make sure I'm not cycling the engine, I'm just rotating it 180* so I'm on the same cycle?
-cFogs out
BT
NNNN
I know this topic is a little old...but, my shop manual says after setting the left cylinder : Rotate the engine 180* and allign the "L" timing mark with the stator index... I don't have a "L" on my motorcycle, am I right in assuming its the "T" mark?
and just to make sure I'm not cycling the engine, I'm just rotating it 180* so I'm on the same cycle?
-cFogs out
BT
NNNN