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Hard spot while cranking

GAS engine, transmission and generator repair and maintenance discussion forum.
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Vessel Info: 1984 Carver 2687 Monterey
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Re: Hard spot while cranking

Postby dcrahn » February 25th, 2018, 8:00 am

As Viper stated, it could be the timing. My first suspect would be weak or broken springs on the centrifugal advance mechanism in the distributor or even corroded and stuck centrifugal weights. The springs control the rate at which the weights fly outwards to advance the timing. If they are weak or broken, the weights will put the timing in full advance during cranking.

On our race car engines we lock the timing out and that puts the timing in full advance at all times. For starting I program the ignition box to retard the timing 10 degrees to make starting easier and avoid kickbacks. Drag race engines essential run at wide open throttle all the time, so vacuum or centrifugal advance is not needed.

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Re: Hard spot while cranking

Postby SanJuanDreamer » April 15th, 2018, 9:19 pm

Update to the update...after testing, it was indeed the broken spring.
It starts as it should and sounds great. Boat is up and running and ready for Desolation Sound....
May 5th I'll be moving it from Dagmars in Everett (Dry dock) to Pt of Edmonds, in a covered slip.
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Re: Hard spot while cranking

Postby mjk1040 » April 16th, 2018, 6:39 am

Well I didn't see that as the hard start problem coming! A spring!!
Mike :down:
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