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Engine Not firing, suspected carb issue
- emptypond
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81 kz750 frame, with an 83 kz750 engine.
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- JR
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emptypond wrote: ...........................
battery- 12.7 (probably need a new battery, but I just bought this one 3 days ago)
I couldn't find clear instructions as to how to test the regulator.
.........................
If 12.7 means 12.7 Volts then that's good. With bike ignition switched off the battery should show about 12.3 V and about 12.7 V or so at idle going up to a max of about 14V at 4,000 rpm. If that's the case then your alternator output and regulator should be fine. If you need to troubleshoot the entire charging system then see kzrider.com/filebase/search_result
Regarding testing the coils you can download the 750 shop manual here mbsween.bike-night.com/kz750l3/manual.html courtesy of mbsween a fellow member of KZR
Good luck
1980 kz750E1, Delkevic exhaust
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- emptypond
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81 kz750 frame, with an 83 kz750 engine.
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- koolaid_kid
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1983 GPz 750
810 Wiseco, Kerker, K&N, DynoJet S3, Accel, Progressive, etc.
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81 kz750 frame, with an 83 kz750 engine.
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- koolaid_kid
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First, you say it is a new battery yet voltage drops from 12.7V to 12.3V when you switch on the key.
Second, it should run off the battery for quite a while without a charging system at all, especially a new battery, yet it refuses to rev.
Third, the carbs used to overflow until you took them apart and (I am assuming) you sprayed them out with carb cleaner.
Are all these statements correct?
1983 GPz 750
810 Wiseco, Kerker, K&N, DynoJet S3, Accel, Progressive, etc.
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- emptypond
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Oh, the engine does get gas, but does not seem to ignite.
81 kz750 frame, with an 83 kz750 engine.
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- emptypond
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81 kz750 frame, with an 83 kz750 engine.
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- Motor Head
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- FIX UP YOUR BIKE RIGHT AND CHEAP
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1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
1980 KZ550LTD C1 Stock SOLD Miss it
1979 MAZDA RX7 in the works, 13B...
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- emptypond
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81 kz750 frame, with an 83 kz750 engine.
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- Motor Head
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The voltage Will go down as you have the key On, Crank it etc. Thats normal. If the spark is Blue to start out with on all 4 plugs, and the coils/ plug wires are on right, base/ static timing is close, you have compression, then you need the right air fuel mixture for it to burn.
So I know you have worked on the carbs, but it still may lead back to them as to why it won't run. Will it fire/ run briefly if you add some gas directly to the rear of the carbs, with a sprayer? Just a few squirts.
1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
1980 KZ550LTD C1 Stock SOLD Miss it
1979 MAZDA RX7 in the works, 13B...
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81 kz750 frame, with an 83 kz750 engine.
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