Topic: Maintenance Procedure

[GreenHornet74]

I just finished doing some maintenance on my recent purchase of a cb750k5. Its been a long day so I can't remember the order in which I did maintenance. I did an oil change, valve clearance, cam chain adjustment, and set the gaps on the points. I plan on doing timing and carb sync next. Before I move on to carb syncing (final step?), is there a proper order I should have followed to get the best results?
Thanks


By the way, if it wasn't for this site i'd be taking the bus more often and or getting a mechanics kid through college.

[rklystron]

Check plugs, or better yet get some new ones. Check them anyway to get an overall condition of how the engine is running. Oil on the plug, fried, ect. Make sure the gap is set properly. I keep my old plugs punched in a cardboard box labeled so I can go back for reference. Check the air filter if it's a K&N clean it and lightly oil. If not replace if required. You can't really clean those OEM paper filters. A K&N will last the life of the bike. Make sure the air box is clean, clean if required. Personally I always do a compression test anytime I change plugs. Just me I like to know whats going on and if I have something going on that I am not aware of. Leak down is better, but that's another story. Looks to me like you are doing everything right. Do all the mechanical stuff first like you have, before you get into Carb Sync and timing. Keep up the good work! All the best.

[Nortstudio]

This is the order TwoTired gave me when I first got my bike:


TT’s Tune Up Sequence

Here's my routine on the 550s, beginning with a cold engine:
Pull out the spark plugs, note their condition, read the deposits. make notes.
Pop off the points cover. Position the crank for the cam chain tension adjust.
Adjust cam chain tension.
Adjust intake and exhaust valve clearances.
Do a Dry compression check.  Make notes.  If anything abnormal, do a Wet compression test.  Make notes.
Clean or replace points, Set point gap and static timing.  Lube point cam.
Clean/recondition spark plugs or replace them.
Clean or replace air filter.
Start engine and allow to reach full operating temperature.
Check dynamic timing and mechanical advance function.
Check carb vacuum sync.
With an unknown bike, check pilot screw adjustment.  My bike; leave it where I set it last time.
If I didn't change the oil (Hot) last night, do it now.

[dhall57]

Keep up the good work GreenHornet. Maintenance is the key on these SOHC/4. Heck working and tinkering on them is half the fun of it. 

[rklystron]

+1 to all you guys!

[bollingball]

Tune Up

a.  Compression test
b.  Tighten cylinder head bolts (see Ch. 4, Camshaft)
c.  Cam chain adjustment
d.  Valve clearance adjustment
e.  Spark plugs
f.   Condenser (capacitor)
g.  Breaker points
h.  Ignition timing
i.   Air cleaner
j.   Carburetion (if needed)Tune Up

This is from the 78 service manual but it should be the same for all years.   

[bollingball]

I copied this page with all the setting and wrench sizes added in. Cover with plastic and tape it to handle bars during tune up

[GreenHornet74]

Thanks guys for all the help. So before I decided to do the timing and move on to the carbs I thought id take it out for a spin and get things warmed up. First mile ran great. Then turns out it ran a little worse than before, it seems to struggle above 45-50mph which it already had that problem to begin with so not too surprised. So I attempted to do the timing with a timing gun (first time), the bike has oem points setup and I couldn't get it quite right. The Firing mark was not steady and jumping around. It seemed to run better with the timing advanced. Well as the timing advanced the rpms increased. It was hot today and I do not have a garage so I called it a day.