Hi,I tried starting my cbx750 yesterday,it fired up ,there was a mechanical chain sounding noise,motor stopped.When I tried again,starter motor turns over ,but motor does not.I have taken starter motor out,it will turn by hand(hard to turn).I bolted it back on temp .to see if it turns with battery connected,and it does.With this bikes strange setup of the starter motor on the top of the alternator,do i need to remove engine and strip down???.thanks for the help.
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Re: starter motor turning,but engine doesn't!!
Sounds like you have a problem with the timing chain and the valve timing is out meaning a valve is down when the piston at the top causing an interference. Take the spark plugs out and with the bike in a high gear and on the center stand see if the engine will turn over by hand by pulling the back wheel. Don't force it or you will bend a valve and damage the piston though it probably has happened already. You would need to open the engine up and see what is happening with the timing chain, valve timing etc and go from there.
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Hi, Anonymous the starter clutch is a separate mechanical gear driven component that is activated by the starter motor, it engages the clutch pack gear or the flywheel gear to turn over the engine. It has an internal mechanism that allows the gear to turn in one "ONE DIRECTION" only and once the engine starts allows the gear to free spin with engine rotation. If the starter gear free spins in "BOTH DIRECTIONS" then the drive gear has failed, it might be serviceable on some models but usually needs to be replaced.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day. Starter spins but won catch Starter spins but doesn turn the engine Honda 1998 VT750C Service Manual https://www.partsfish.com/page/oem-parts-for-honda HONDA VT750C Owner Manual
There is most likely a problem with your starter -- if it is not grabbing the engine to turn it over when you turn the key, the starter motor will spin (giving you the whirring noise) but the engine will not move. First things first ... have someone turn the key, and hit your starter with a stick or something ... sometimes this will free up whatever part is not working proper5ly, and you won't have to replace your whole starter. If hitting your starter doesn't work ... and if you are good with cars, try replacing the starter and see if that helps.
Hopefully those will help ... if not, you will probably have to take the car to a mechanic to get it fixed, as there are several other parts that could be causing the issue -- but they are hard to get to and require some experience to know what you are looking for.
You may have an "over running clutch" going bad on you. This part does the same thing that the old "Bendix" used to do. It is a one-way bearing or sprag unit. When the starter goes to start the engine, the starter is turning faster than the engine. The unit locks up and turns the engine. Once the engine fires, the engine is turning much faster than the starter. If the starter doesn't freewheel, the speed of the starter would destroy it. So, when the engine starts up, the "over running cltuch" unlocks and allows the starter drive gear to freewheel. The part is inside the starter. It can be replaced but it requires that the starter be removed and disassembled.
If you'll look just behind the rear cylinder, there is a black thing with a large cable running to it. This is the starter on your bike.
I could be your starter hanging up. When you press the start button, the jackshaft is pushed out by the solenoid part of your starter and it engages the ring gear on your outer clutch drum. The starter motor starts up and turns your engine. Once the engine fires, the jackshaft is now turned faster than the starter motor can turn it and the starter clutch allows it to "free wheel" until you let off on the start button. Once you let off on the start button, the solenoid demagnetizes and pulls the jackshaft out of engagement with the ring gear.
If you think the starter is hanging up, you need to take it to a qualified mechanic and have it checked. Since you don't know where the starter is, I would be hesitant to tell you how to try to repair the starter. Have it checked out before the starter clutch locks up and the starter is destroyed and cause damage in other areas as well.
First may I say I don't know for sure your bike model that well (In- line 4 cylinder or water cooled twin?) BUT I am very experienced with motorcycles ( I am a qualified motorcycle mechanic & have owned GPZ 550, Z650, ZIR-II ).
For starters Kwasaki have used two different methods of delivering drive from the starter motor to the engine. Gear driven & chain driven. The chain driven type ( like GPZ 900 R ) were equiped with a tensioner. If yours has a tensioner be sure to change it with a new one also.
Both of the styles of drives ( chain & gear ) incorporate what is called a starter clutch mechanism.
This is what allows drive from the starter motor to be applied only when the starter motor is activated & free wheel when the engine runs. It is a one way clutch mechanism.
I am explaining this because a verry common fault on all electric start bikes is the starter clutch. ( except Moto-Guzzi, BMW, Harley which use a car style starter with a sliding pinion ).
When the starter clutch is faulty it displays a very distinct symptom.
When the starter motor is activated, you will hear a "whizz" followed by a crunching noise rather reminicent of a chain jumping teeth on a sprocket.
If this is the case with your bike & is what is what led you to change the chain, plus is what your continueing problem is, I would suggest you check the starter clutch.
The starter clutch comprises of a drive gear(the one that the chian, or startor motor output shaft drives), 3 rollers, three springs with guide pins, & the housing plate for the rollers & springs with guides.
To effectivly repair a starter clutch it is necessary to replace the gear, the 3 rollers, the 3 springs, sometimes the housing plate if it is also worn (from the rollers moveing)
I am hopefull this may shed some light as to the cause of your problem.
If not please post a comment & I'll try to help you further.