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Unread 10-11-2018, 05:35 AM   #1
Not Yet Wild
Yamaha
 
Join Date: Sep 2018
Location: Missouri
Posts: 3
Default g16a rotation lock at start up

When starting cart, sometimes engine will rotate only a partial turn and then lock. I can rotate flywheel or clutch by hand and then engine will start the next time. Also sometimes "fluttering" gas pedal will sometimes get cart to go with a sputter until it fires strong.
Back story on cart.
Purchased missing cylinder head. They said they "tightend" the clutch to gain more power, broke a keeper on a valve, and ended up loosing the cylinder head.
I have since replaced cylinder head, gapped valves @.004, cleaned all electrical connections, replaced coil, filters, spark plug. cleaned all gas lines, carb, and fuel pump.
This is my first cart and I am learning as i go.
Thank you in advance.
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Unread 10-11-2018, 07:16 AM   #2
Gone Wild
 
Join Date: Nov 2015
Posts: 165
Default Re: g16a rotation lock at start up

Could be a starter issue (brushes, etc). Battery in good condition?
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Unread 10-11-2018, 07:23 AM   #3
Not Yet Wild
Yamaha
 
Join Date: Sep 2018
Location: Missouri
Posts: 3
Default Re: g16a rotation lock at start up

Yes new battery. I can hit the “stop” even turning by hand. Lifter, push rod, valve gap, clutch, rear end? Too many places for my novice mind to know where to start.
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Unread 10-11-2018, 10:06 AM   #4
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Join Date: Oct 2009
Location: SW Virginia USA
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Default Re: g16a rotation lock at start up

First thing would be to pull the valve cover back off and see if anything is obviously wrong inside.
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Unread 10-11-2018, 10:45 AM   #5
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Join Date: Oct 2014
Location: Fortescue NJ
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Default Re: g16a rotation lock at start up

Quote:
Originally Posted by Dave in VA View Post
First thing would be to pull the valve cover back off and see if anything is obviously wrong inside.
Same here
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Unread 10-11-2018, 10:11 PM   #6
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Join Date: Jun 2009
Location: Phoenix
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Default Re: g16a rotation lock at start up

Dirty or loose wire connections, but I’m guessing starter brushes!! (That is; if battery is proved to be good)
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Unread 10-12-2018, 04:29 AM   #7
Not Yet Wild
Yamaha
 
Join Date: Sep 2018
Location: Missouri
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Default Re: g16a rotation lock at start up

update. I regapped valves from .004 to .005 and that fixed the rotation lock issue. Thank you Dave. Ran like a champ on jack stands. Set it down and tried to drive, and the sputtering began again. Starter generator began to get hot and smoke. So now I will check that to see if it can be salvaged and if so replace brushes. Thank you all again for the input.
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Unread 10-12-2018, 10:50 AM   #8
Gone Wild
Yamaha
 
Join Date: Apr 2018
Location: GA
Posts: 376
Default Re: g16a rotation lock at start up

I was going to guess the starter/generator isn't strong enough to turn it past the compression stroke. Worn brushes, or worn starter/generator can cause that.

check compression also to make sure it isn't "too" high. carbon build-up can cause excessively high compression.
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