Question about 1984 Honda CBX 750 F

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Starter motor turning,but engine doesn't!!

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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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.

Posted on Sep 29, 2009

Testimonial: "Thanks,could not get past 2nd gear,did get to turn crank over,not sure yet if cams turning,I think the starter chain is u/s.engine strip here we come."

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Hi does it sound like it is turning over much easier than normal? much faster as you say.

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Both of the styles of drives ( chain & gear ) incorporate what is called a starter clutch mechanism.

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When the starter clutch is faulty it displays a very distinct symptom.

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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.

Regards Andrew porrelli

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