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Tractor Talk Discussion Forum

Briggs 16hp Twin

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JD4300

12-26-2003 18:33:09




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The tappet clearance is to specs and the motor runs sometimes. It seems that it will not start when the temp. is around freezing. The engine cranks and every couple revolutions you can hear it almost kick over. Spark plug on the left cylinder is always damp while the right is dry. Both plugs have bright spark. When it does start, I can start it within a couple of hours after running. The battery is always charged and/or is at maximum potential (using charger). I use 5W-30 oil in the 16Hp for the winter. I just cannot figure out why it does not start in the cold temperatures.

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Butcher

12-27-2003 14:02:56




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 Re: Briggs 16hp Twin in reply to JD4300, 12-26-2003 18:33:09  
You might try pulling the plugs and pouring in a very small amount of oil into the cyl. If it starts right up this will tell you that you may need rings or a valve job. Those engines will not start easily if compression is to low.



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RAB

12-27-2003 12:50:39




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 Re: Briggs 16hp Twin in reply to JD4300, 12-26-2003 18:33:09  
One dry plug would indicate to me that it ain't getting it's fair share of fuel. As, I think you have said previously that compression is low? on both, it may be that there is something quite worn out, like rings, valves/seats or bores, or there may be an induction leak on one cylinder. Engines will run on very low compression, much lower than they should have ideally.
It seems that this engine may be due at least a top end overhaul.
Regards, RAB

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