1985 Kawasaki GPz750 needs refresh

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  • Buffalo Bill
    Forum Guru
    Past Site Supporter
    Super Site Supporter
    • Jun 2008
    • 6009
    • New Buffalo, Michigan 49117
    #46
    After thinking about how the engine was behaving before I pushed it to just over 8,000RPM, then it lost power continuously until it quit, and now has a rod knock.
    I think it had low oil pressure and was doomed to fail soon.
    Where would I put an oil pressure gauge on this engine?
    I ordered an ebay salvage oil pump, that the seller claimed to have taken apart and examined. He has a high rating.
    1982 GS1100G-
    1990 GSX750/1127
    1987 Honda CBR600F Hurricane
    1985 Kawasaki GPz750

      Comment

      • GS1150Pilot
        Forum LongTimer
        Past Site Supporter
        • Nov 2013
        • 18993
        • MoN, AZ
        #47
        Originally posted by Rob S.

        Z1 redline was 9k, and it made good power past that any day of the week.

        The Sporty red line may have been 6k, but there was virtually never any benefit after 5k.

        Wait, what were we talking about?
        Max power on the Z1 came at 8500, Rob. Not much point to 9K there. The (gads) Shafty CB900C could run pretty much exactly the same times and speeds, and it actually made max power at 9K.
        Last edited by GS1150Pilot; 11-17-2025, 03:27 PM.
        "Thought he, it is a wicked world in all meridians; I'll die a pagan."
        ~Herman Melville

        2016 1200 Superlow
        1982 CB900f

          Comment

          • Rob S.
            Forum Guru
            Past Site Supporter
            • Dec 2013
            • 9510
            • New York City
            #48
            Originally posted by GS1150Pilot

            Max power on the Z1 came at 8500, Rob. Not much point to 9K there. The (gads) Shafty CB900C could run pretty much exactly the same times and speeds, and it actually made max power at 9K.
            The Z1 and my 11EZ (and virtually all UJMs of the day) were identical in that respect. Max torque at 65k, max hp at 85k. But they still make good power past red line. Unlike my Sporty, which just sputtered and would not rev past 6k.

            My 1971 Honda CB350 was interesting: 12k tachometer, red zone from 9 to 11k. The owner's manual said it could be run up to 9k indefinitely, and from 9 to 11k briefly. NEVER supposed to exceed 11k. Bulletproof.
            1982 GS1100E V&H "SS" exhaust, APE pods, 1150 oil cooler, 140 speedo, 99.3 rear wheel HP, black engine, '83 red

            2016 XL883L sigpic Two-tone blue and white. Almost 42 hp! Status: destroyed, now owned by the insurance company. The hole in my memory starts an hour before the accident and ends 24 hours after.

              Comment

              • GS1150Pilot
                Forum LongTimer
                Past Site Supporter
                • Nov 2013
                • 18993
                • MoN, AZ
                #49
                Originally posted by Rob S.

                The Z1 and my 11EZ (and virtually all UJMs of the day) were identical in that respect. Max torque at 65k, max hp at 85k. But they still make good power past red line. Unlike my Sporty, which just sputtered and would not rev past 6k.

                My 1971 Honda CB350 was interesting: 12k tachometer, red zone from 9 to 11k. The owner's manual said it could be run up to 9k indefinitely, and from 9 to 11k briefly. NEVER supposed to exceed 11k. Bulletproof.
                The 1200 motor I have built for my Sportster revs to 7 but stops making good power at 6500. The stock bike has a limiter that can be tuned out.
                "Thought he, it is a wicked world in all meridians; I'll die a pagan."
                ~Herman Melville

                2016 1200 Superlow
                1982 CB900f

                  Comment

                  • Buffalo Bill
                    Forum Guru
                    Past Site Supporter
                    Super Site Supporter
                    • Jun 2008
                    • 6009
                    • New Buffalo, Michigan 49117
                    #50
                    Just getting started with disassembling engine.
                    So far cams and valve clearances are all very good.

                    KyQE21a.jpg
                    1982 GS1100G-
                    1990 GSX750/1127
                    1987 Honda CBR600F Hurricane
                    1985 Kawasaki GPz750

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