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Subject: Clutch grabs

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LeRoy    Posted 01-27-2024 at 22:19:06 [URL] [DELETE]        [Reply] [Email]  
  • Clutch grabs
  • I've got a '49 with a clutch that grabs real bed. Any cure? Also, will the governer make the engine run ruff?


    BlasterStumps    Posted 02-01-2024 at 21:03:36 [URL] [DELETE]        [Reply] [Email]  
  • Re: Clutch grabs
  • Not a fourty niner but, I had my NAA run rough one time and I came to discover that I had opened the fuel shut-off too many turns and it was in the reserve area but the tank was nearly empty. Some junk in the fuel tank was plugging the filter in there. I put some gas in the tank and it smoothed out. I think that gas caused the junk to float so it wasn't clogging the filter. I took the tank off and cleaned it really good.

    Bruce(OR)    Posted 01-28-2024 at 14:53:17 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Clutch grabs and things that go bump in the night. . .
  • Governor is designed to increase RPM under a load.
    Now if increasing your speed under a load generates a misfire then consideration of what might be problematic in an engine mis-fire, under load, comes into play.
    Generally a spark plug wire misfire comes into play at a higher RPM.
    However, you said under a load. So if the engine is under a strain and misfiring you could look at the power circuit inside the carburetor as being faulty. '
    However the carburetor is the absolute last thing to look at when diagnosing an engine.
    We're still diagnosing so the carburetor, while a player, is dead last on the list. before you touch the carburetor, you need to diagnose and verify the operation of the electrical system without a doubt.
    Generally the first place an engine has to work to overcome a load is inside the combustion cylinder. What easily replaceable part is located inside the combustion cylinder to provide electricity in the form of a spark?
    There might be a good place to start diagnosing your engine. Now if the sparkies all look acceptable perhaps a general inspection of the air pressure inside the cylinder should be next in order after removing the sparkies. That would be a compression check to make sure your not flogging a horse that is already dead upon arrival.

    As for that massively complex clutch, a simple replacement might be in order following all standards on prevention of a sticking clutch in the future which have already been covered numerous times.

    LeRoy    Posted 01-28-2024 at 15:59:27 [URL] [DELETE]        [Reply] [Email]  
  • Re: Clutch grabs and things that go bump in the night. . .
  • The engine has less than 5 hours of running time since an overhaul. I tried electronic ignition and it didn't work. It has a hot coil from Petronics.I'm wondering if there is a wire in the wiring that is too old?


    Bruce(OR)    Posted 01-28-2024 at 23:07:59 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Clutch grabs and things that go bump in the night. . .
  • Ah, the light shines and the truth emerges from the shadows. . .
    So with the 12V coil and the electronics you jumped the plug gap from the lowly .025 to .045, correct?
    As for the coil, that is wired up with NO ballast resistor, correct?
    Yes. Lets shine the light in that direction.

    LeRoy    Posted 01-29-2024 at 15:29:36 [URL] [DELETE]        [Reply] [Email]  
  • Re: Clutch grabs and things that go bump in the night. . .
  • No and No. I've installed a number of these and never had a problem like this. As a matter of fact I never had a problem. Do you suppose this correction will cure it?



    Bruce(OR)    Posted 01-29-2024 at 21:56:39 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Clutch grabs and things that go bump in the night. . .
  • Apparently no one else desires to play. It runs perfect at idle, no pops or flutters in the exhaust when standing down wind of the exhaust pipe, correct?

    Does it hesitate when you accelerate?
    Runs fine with no load on engine?
    You pulled the dist cap and wiggle the dist shaft and found no movement?

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