Author Topic: Maintenance Procedure  (Read 3060 times)

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Offline GreenHornet74

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Maintenance Procedure
« on: April 16, 2011, 02:51:36 AM »
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


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Offline rklystron

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Re: Maintenance Procedure
« Reply #1 on: April 16, 2011, 04:17:41 AM »
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.
1970 CB750 K0 (Bought in 73)
1972 XL250 (Bought new in 72)
1973 ST90 (Free)
1975 XL250 (Free)
1975 Rickman CR750
1982 CBX1000 Pro-link
1975 CB750 DRAG BIKE
1977 Custom Built CB750 Sturgis Bike (GL front end).
1977 CB750 F2 (Big Resto)
1977 CB750A (Auction Buy)
1978 CB750 K8 (My San Francisco ride)
1984 VFR750 (Bought New)

Offline Nortstudio

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Re: Maintenance Procedure
« Reply #2 on: April 16, 2011, 04:33:58 AM »
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.
1976 CB550K...in progress
1975 CL360...eventually custom
2009 Husqvarna TE610

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Offline dhall57

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Re: Maintenance Procedure
« Reply #3 on: April 16, 2011, 04:34:40 AM »
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.  ;)
1970 CB750KO
1971 CB500KO-project bike
1973 CB350G- project bike
1974 CB750K4-project bike
1974 CB750K4
1976 CB750K6
1977 GL1000
1997 Harley Wideglide

Offline rklystron

  • I have not failed. I've just found 10,000 ways that won't work. Thomas A. Edison
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Re: Maintenance Procedure
« Reply #4 on: April 16, 2011, 04:51:57 AM »
+1 to all you guys!
1970 CB750 K0 (Bought in 73)
1972 XL250 (Bought new in 72)
1973 ST90 (Free)
1975 XL250 (Free)
1975 Rickman CR750
1982 CBX1000 Pro-link
1975 CB750 DRAG BIKE
1977 Custom Built CB750 Sturgis Bike (GL front end).
1977 CB750 F2 (Big Resto)
1977 CB750A (Auction Buy)
1978 CB750 K8 (My San Francisco ride)
1984 VFR750 (Bought New)

bollingball

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Re: Maintenance Procedure
« Reply #5 on: April 16, 2011, 07:51:16 AM »
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

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Re: Maintenance Procedure
« Reply #6 on: April 16, 2011, 07:56:45 AM »
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 :)

Offline GreenHornet74

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Re: Maintenance Procedure
« Reply #7 on: April 16, 2011, 10:47:07 PM »
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. 
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