baldjeff
CB750 Member
Hi all, I'm in the middle of adjusting the valves on my '81 CB750C. From what I understand the cylinder pairs are supposed to be in line with each other as you rotate the crank right? In other words, when the notch on cylinder 4, exhaust side, is at the 3 o'clock position, then cylinders 1 and 3 exhaust lobes should both be pointing towards the exhaust. That's not the case for me. When the notch is at 3 o'clock then cylinder 1's (exhaust side) lobes are pointing upwards and cylinder 3's lobes are pointing towards the exhaust. As I turn the camshaft 90 degrees, then cylinder 1 (intake side) are facing towards the intake and 3 are facing upwards. Same goes for cylinders 2 and 4 as I continue to turn the crank, they're not in line with each other. Is something way off with my camshafts? Is that going to effect my clearance readings? I just want to make sure I did this right before I order a ton of shims. The white lines on cylinder 1 are 180 degrees apart but not on cylinder 4.
I posted my compression readings in another post. If it gives you any additional info they are as follows: cylinder 1 - 145, 2 - 150, 3 - 167, 4 - 142.
Here were my clearance readings, all in inches: Exhaust side, cylinder 1 - .0025 and .002, 2 - .003 and .003, 3 - .0025 and .002, 4 - .003 and .0015
Intake side, cylinder 1 - .004 and .003, 2 - .004 and .004, 3 - .004 and .004, 4 - .004 and .004
Also, as I turn the crank there's a fair amount of resistance then it almost falls into 3, 6, 9, 12 o'clock positions. I'm only turning clockwise from the right side of the engine. Is that how it's supposed to feel to turn the crank? Thanks in advance for your help.
I posted my compression readings in another post. If it gives you any additional info they are as follows: cylinder 1 - 145, 2 - 150, 3 - 167, 4 - 142.
Here were my clearance readings, all in inches: Exhaust side, cylinder 1 - .0025 and .002, 2 - .003 and .003, 3 - .0025 and .002, 4 - .003 and .0015
Intake side, cylinder 1 - .004 and .003, 2 - .004 and .004, 3 - .004 and .004, 4 - .004 and .004
Also, as I turn the crank there's a fair amount of resistance then it almost falls into 3, 6, 9, 12 o'clock positions. I'm only turning clockwise from the right side of the engine. Is that how it's supposed to feel to turn the crank? Thanks in advance for your help.