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  1. #21
    CB750 Enthusiast Chris in Dorset England's Avatar
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    mine looked like that

  2. #22
    CB750 Enthusiast Chris in Dorset England's Avatar
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    sour sugar cubes!

  3. #23
    CB750 Enthusiast everready's Avatar
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    Well today I pulled the plugs, valve cover/right side engine cover and changed the oil. I poured some motor oil on the cams, they were bone dry.
    I think this looks ok
    Click image for larger version. 

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    The number two spark plug gave me some grief. At first I thought it was cross threaded but it just had a bit of corrosion on it.
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    Are these cracks? I can't see anything on the outside of the cover.
    Click image for larger version. 

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    Is this normal?
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    I have an endoscope on order, it should be here tomorrow. Now I'm going to check the valves. At only 8000 miles I hope they're still in spec.

    Al
    Last edited by everready; 11-11-2017 at 12:54 PM.

  4. #24
    CB750 Enthusiast everready's Avatar
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    I just did the valves. It looks like they're dead-on.

    EX1 .003 .005 EX3 .005 .006 in
    IN 1 .004 .003 IN3 .004 .004 in

    EX 2 .004 .004 4 .006 .005 in
    IN2 .004 .004 4 .005 .005 in

    I'm pretty pleased with these findings. I'm going to order a new gasket and screw and put it back together.
    Last edited by everready; 11-11-2017 at 02:35 PM.

  5. #25
    CB750 Enthusiast everready's Avatar
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    Stupid question answered by me.
    Last edited by everready; 11-11-2017 at 02:22 PM.

  6. #26
    CB750 Enthusiast Chris in Dorset England's Avatar
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    Quote Originally Posted by everready View Post
    Well today I pulled the plugs, valve cover/right side engine cover and changed the oil. I poured some motor oil on the cams, they were bone dry.
    I think this looks ok
    Click image for larger version. 

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    The number two spark plug gave me some grief. At first I thought it was cross threaded but it just had a bit of corrosion on it.
    Click image for larger version. 

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    Are these cracks? I can't see anything on the outside of the cover.

    Click image for larger version. 

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    Is this normal?
    Click image for larger version. 

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ID:	8097

    I have an endoscope on order, it should be here tomorrow. Now I'm going to check the valves. At only 8000 miles I hope they're still in spec.

    Al
    Not cracks, my cover has those too, they look like possible faults in the casting die. Clean off the rotor ring contacts with electrical contact cleaner. Check the brushes in the cover for useable length and free moving.

  7. #27
    CB750 Enthusiast everready's Avatar
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    Well the new master cylinder arrived today. I was getting ready to fill and bleed when I saw this.
    What is that thing down inside near the ports? I found a google image of it in a CX650 but in that picture it's rotated 90 so the round metal tip is closer to the return port.

    Click image for larger version. 

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    Confused,
    Al

  8. #28
    CB750 Guru amc49's Avatar
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    Last pic is too small to tell anything (master c).

    Can't tell from #2 plug pic very well either but it looks like it has some aluminum in the threads meaning you lost some thread from head and now easier to strip it out. What forcing parts over corrosion does with no lube.

    Those aren't cracks, Chris has it right.

  9. #29
    CB750 Enthusiast everready's Avatar
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    That thing in the MC has a part number. A guy from ADV confirmed that it belongs there. Now I have brakes.
    I sprayed PB Blaster on the spark plugs about a week before I pulled them. Glad I did, not telling what would have happened. I'm going to use the endoscope to take a better look at the threads on cylinder two.

  10. #30
    CB750 Guru amc49's Avatar
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    Luck................the part you speak of could be a fluid deflector of some type to prevent the compensation return shot hitting the cover gasket, that lends toward leaking.

    I myself would correct any shims at .003" since .002" is effectively zero and WILL burn like that. Why we use .005" as a set-to number instead of the service manual .003", the latter causes a lot of valves to burn for no reason.

  11. #31
    CB750 Enthusiast everready's Avatar
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    Well I decided to check out the cam chain tensioner today. The lock nut on the front adjuster busted loose with little effort, however, the bolt is stuck. I put a ratchet on it and tried to loosen it a bit, no go. Then I tried to tighten it a bit, no way. Not sure what's going on with it. I'll take a better look later. Got it!
    Now I'm waiting on the valve tool, I'm going to swap a few shims from EX 1&3 and then pull one out of IN 3 and see what size I need. I found cool formula on how to calculate shim thickness: https://www.youtube.com/watch?v=tl9Cze6WcKI I think this method is a lot easier than trying to use that chart in the manual.
    Last edited by everready; 11-16-2017 at 05:58 PM.

  12. #32
    CB750 Guru amc49's Avatar
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    Do NOT rotate engine missing shims-damage will result.

  13. #33
    CB750 Enthusiast everready's Avatar
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    Quote Originally Posted by amc49 View Post
    Do NOT rotate engine missing shims-damage will result.
    Yes. Thank you for the confirmation. I'll definitely need to pay attention on that.

  14. #34
    CB750 Enthusiast everready's Avatar
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    Quote Originally Posted by amc49 View Post
    Luck................the part you speak of could be a fluid deflector of some type to prevent the compensation return shot hitting the cover gasket, that lends toward leaking.

    I myself would correct any shims at .003" since .002" is effectively zero and WILL burn like that. Why we use .005" as a set-to number instead of the service manual .003", the latter causes a lot of valves to burn for no reason.
    EX1 .003 .005 EX3 .005 .006 in
    IN 1 .004 .003 IN3 .004 .004 in

    Well I managed to swap the .003 and the .006. Now they read .004 and .005. I ordered a shim for IN 1 V2 that is .05mm thinner. Hopefully that'll do the trick

  15. #35
    CB750 Enthusiast everready's Avatar
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    Nevermind
    Attached Thumbnails Attached Thumbnails IMG_20171118_074810941[1].jpg  
    Last edited by everready; 11-18-2017 at 09:36 AM.

  16. #36
    CB750 Enthusiast everready's Avatar
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    Never mind.
    Last edited by everready; 11-18-2017 at 09:36 AM.

  17. #37
    CB750 Guru amc49's Avatar
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    Spiffy. Always look at the wear pattern on used shims, most polish only and fine but occasionally you get a specific wear pattern and best not to swap that one to another lobe as it can bring on sudden wear.

  18. #38
    CB750 Enthusiast everready's Avatar
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    Quote Originally Posted by amc49 View Post
    Spiffy. Always look at the wear pattern on used shims, most polish only and fine but occasionally you get a specific wear pattern and best not to swap that one to another lobe as it can bring on sudden wear.
    I didn't notice a wear pattern on either of them. With only 8k on the odo I wasn't really expecting to see any. When I rebuilt the engine in my Saab I had to keep track of the hydraulic valve buckets. Styrofoam egg cartons came in handy!

  19. #39
    CB750 Enthusiast everready's Avatar
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    I think it's going to look OK. When I put new tires on it I plan to remove the swing arm and blast/paint it. Or I might just get a used on from Ebay. It's probably cheaper that way anyhow.

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  20. #40
    CB750 Enthusiast everready's Avatar
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    Well she cranked but did not fire up. After I pulled off the carbs I noticed fuel going into the cylinders

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    Then I proceeded to remove the bowls. I didn't remove carb 2 bowl yet. I want to read more about that. But feast your eyes on these. Now, I'm a novice a carbs but I noticed right away that something was amiss. Yes, that's what I found when I removed the bowls.

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    I also noticed that the rear right valve cover bolt hole is stripped. What would be the best way to fixing that?

    I got a pretty good picture of each jet. I thought primary was 68 and secondary is supposed to be 98? Isn't 120 a HUGE jump?
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    Last edited by everready; Yesterday at 07:13 PM. Reason: Add info

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