Service Manual Honda 1981 Cb750c
Taking a big breath here. Not knowing the maintenance of the motorcycle in question I'm going to assume (not a good thing to do) that the 750 starts and runs as it should through the idle and low speeds.
If this is so then I would point you in the direction of the fuel filter and screen in the petcock/tank. What may be happening is the engine is being starved of gas at mid range where as enough fuel is entering the system at lower speeds. If the filter(s) are clear or clean you may need to remove the carb(s) and clean out the high speed jets and reset the float heights. This is mostly labor as in time consuming.
Make sure the carb(s) are balanced and the slides are all opening and closing at the same time. I haven't heard this 'brake up' as you call it so if it's a lack of power stall hesitation and refuses to go over a certain point I'm thinking a fuel starve but, something else can be causing your greif and that is a break down in an ignition coil. Your bike is CDI ignition so if it's not the gas then the next thing is the coil(s) Lastly because it's a four valve per cylinder design what could also be the problem is one of the exhaust valve springs in each cylinder my be weak or broken and allowing it to bounce or flutter. Of course a trained ear could hear this at an idle or slightly blipping the throttle spitting or popping in the exhaust. It could also be an intake valve and that can be seen in the carb throats and a gas wet air filter with gas laying in the air box. Okay and the final thing is a worn cam chain with to much slack which has altered the valve timing and that's a bad thing, actually the valve problem isn't to good ether. If one of the valve keepers drops off because the valve spring is week or broken that valve could drop into the cylinder and basically grenades the engine.
If the cam chain is loose it could break and personal experience I've had one break and it just cut the engine cylinders in half. Your gas is the first thing I'd go after. Posted on Feb 09, 2011. Hi, Richard and the usual suspects are: 1.
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Fouled spark plugs. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper 'LOAD' test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead acid batteries. Check battery terminals for damage or corrosion, check the battery cables at 'BOTH' ends for loose, corroded, or broken connectors, 'INSIDE' and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
Loose connection at ignition coil or plug between ignition sensor and module. Spark plug cables in bad condition, shorting/leaking, spark plug cable connections loose check for spark leakage in the dark. Faulty ignition coil or electronic control module. Faulty CKP, CMP, or BAS sensor.
Faulty ignition switch. Tilt sensor needs a reset. Security alarm failing to disarm needs reset For more information about your issue and valuable 'FREE' downloads that you will need please click on the blue links below. Good luck and have a wonderful day. Btw, I’m available to help over the phone in case u need at Jul 14, 2017.
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This Honda DOHC CB750 Manual is 336 pages. QUICK REFERENCE DATA CHAPTER ONE / GENERAL INFORMATION Manual organization / Service hints /Safety first / Expendable supplies / Shop tools / Emergency tool kits / Troubleshooting and tune-up equipment CHAPTER TWO / TROUBLESHOOTING Starting difficulties / Poor performance / Drive train / Chassis / Brakes / Electrical system / Charging system / Lighting / Fuses / Wiring CHAPTER THREE / LUBRICATION, MAINTENANCE, AND TUNE-UP Routine checks / Service intervals / Tires / Crankcase breather hose (U.S.