GSX-R 750 Pictures of how I adjusted the valves on my 1985 1986 1987 Suzuki GSX-R750 motorcycle.

But first, lets pay some bills:

  1. She ran a bit rough when I got her, so I assume she needs a valve job. I took off the tank and plastics. Damn, I love this bike.
    I love Veronica

  2. To adjust the valves, I need to take off the valve cover. The valve cover bolts have little plastic plugs in them. I popped those out.

  3. I need to remove all these to remove the valve cover: Four bolts in the field, eight allen bolts on the perimeter, one more allen in the front and one more in the back, and two small allen bolts holding on each oil line.

  4. The small allen in front is hard to see, but I could feel it and I took it off.
    sneaky allen

  5. When my wife got this little electric screwdriver for me for my birthday, I looked at it condescendingly and forced a smile. As I said thank you, I wondered where I would keep this toy power tool so it would not get too dusty from disuse. I use the damn thing more than any other tool I have. I love it. If you do not have one, go get one. Thank you, dear. Anyway, four bolts in the middle...
    four bolts

  6. and each bolt has a washer.

  7. The oil lines have o-rings. I did not lose them, they are still good, I reused them, and no leaks after reinstall.

  8. There is the valve train with the valve cover off. All those valves. I am so glad they are not shim type valves.
    many valves     valves

  9. I need to take off the signal generator / stator cover, to turn the crankshaft, to rotate the engine, to rotate the camshafts into the correct positions, to check the valve clearances. More allen bolts.
    timing cover

  10. There's the signal generator, and I think that's the oil pressure switch under it. The allen in the middle of the crank holds on the signal generator rotor. The outer bolt on the rotor is keyed into the crankshaft.
    signal parts

  11. I rotated the engine with a wrench on the larger rotor, not on the smaller allen in the middle, as that could damage the threads that hold on the rotor. I rotated it to bring the mark to the left pickup coil.

    Hey, I have a Vance and Hines Racing ignition advancer. VHR. Who knew?
    pickup coil

  12. From the Factory Service Manual (FSM), check the valves marked C when the marks on the camshafts point out, and the valves marked D when the marks on the camshafts point in.

  13. There is a shot with the cam in position "C."

  14. There is a shot with the cams in position "D."

  15. Every time I rotated the engine, some oil poured out of the oil channel next to the oil pressure switch.

  16. I measured the valve clearances, and every one was tight. Surprise.
    measure valve clearance

  17. I want all the valve clearances on the loose end, as close to 0.15 mm as I can get them, without going over.

  18. I made this little tool to adjust the valves. A square drive screw, and a wingnut to hold onto it. Later I added a nut to lock the wingnut, a big washer to push on, and a rubber washer because that was the biggest washer I had.
    valve adjustment tool

  19. The square drive screw head slot holds onto the center of the valve clearance adjuster and keeps it from rotating while I tighten the locking nut. I adjusted all the valves so that I could just BARELY, SNUGLY, insert the 0.15mm feeler.
    valve adjustment tool

  20. After all the valves were adjusted, I retorqued all the head bolts.

  21. And this tiny head bolt in the front. See the little box end wrench.
    tiny head bolt

  22. And one of the valve bolts was leaking, so I put a bit of my favorite and often used Permatex, their excellent Ultimate Grey Moto Seal. No more leaks. Hey Permatex, please send me some free Moto Seal. Also a t-shirt, XL.
    product placement

  23. Next I sold out to make 02ยข so I can fulfill my lifelong dream of owning a 1986 944 with blown head gaskets.

    But no minivans!

  24. Then I finished my beer.

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Disclaimer: The technical information in these documents is provided without any warranty whatsoever and at no cost.   All information is in general terms and is not meant to apply to your particular situation, be current at the time you read it, or even be correct in the first place.   Improperly maintained vehicles can lead to serious injury, death, or unavoidable accidents. The author is not responsible for any errors on this site, and does not make any claim at all about the validity, safety, or veracity of the information contained on this website. Any work you choose to do or not to do on your vehicle is done at your own risk. The information on this site is not intended to serve as a replacement for professional advice, professional workmanship, dealer service, union labor, or psychological counseling.   The author disclaims any and all liability directly or indirectly arising from the application or use of any information or idea contained on this or any other web site.   By opening this page, you agree to never sue anyone ever or allow anyone to be sued on your behalf.   The appropriate professional should be consulted regarding your specific condition. does not take responsibility for the information posted on other sites to which it links.

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