99 G16 not firing, clutch spinning

adamq72 · 03-04-2020, 07:22 PM

Pulled the gas line off the carb, and no fuel coming out at all when I press the accelerator. This would lead me to replacing the fuel pump, but anyone have a clue what the very loud banging sound was that started this?

CP241 · 03-04-2020, 08:16 PM

That doesn't sound right to me when it spins. It sounds like either the clutch is spinning on the crankshaft or the engine has zero compression (broken rod maybe)?

Can you remove the spark plug, and stick a wooden dowel or something in the spark plug hole (something long) and slowly turn the clutch by hand. Verify the dowel moves up and down, this tells me the piston is moving. If so, remove the valve cover and see if the valves are actually moving when it spins? That will answer a lot before you go buying anything.

If both the piston and valves are moving, rent a compression tester from your local auto parts store (its free) and check compression.

To me, that motor just spins waaaaay too freely for it to be right. But it doesnt cost anything except a few minutes to prove me wrong

slonomo · 03-05-2020, 08:58 AM

Quote:

Originally Posted by CP241

That doesn't sound right to me when it spins. It sounds like either the clutch is spinning on the crankshaft or the engine has zero compression (broken rod maybe)?

Can you remove the spark plug, and stick a wooden dowel or something in the spark plug hole (something long) and slowly turn the clutch by hand. Verify the dowel moves up and down, this tells me the piston is moving. If so, remove the valve cover and see if the valves are actually moving when it spins? That will answer a lot before you go buying anything.

If both the piston and valves are moving, rent a compression tester from your local auto parts store (its free) and check compression.

To me, that motor just spins waaaaay too freely for it to be right. But it doesnt cost anything except a few minutes to prove me wrong

If there is noise, it's not usually good. It could be the primary clutch, sometimes the weights inside get loose and wobble around and make metal to metal type noise. You could remove the clutch and check that also.

adamq72 · 03-05-2020, 03:50 PM

Quote:

Originally Posted by CP241

That doesn't sound right to me when it spins. It sounds like either the clutch is spinning on the crankshaft or the engine has zero compression (broken rod maybe)?

Can you remove the spark plug, and stick a wooden dowel or something in the spark plug hole (something long) and slowly turn the clutch by hand. Verify the dowel moves up and down, this tells me the piston is moving. If so, remove the valve cover and see if the valves are actually moving when it spins? That will answer a lot before you go buying anything.

If both the piston and valves are moving, rent a compression tester from your local auto parts store (its free) and check compression.

To me, that motor just spins waaaaay too freely for it to be right. But it doesnt cost anything except a few minutes to prove me wrong

Tried what you said and the dowel did not move at all.. I pressed down and felt the piston move.. when I spun the shaft it came back up but didn't move any more..

slonomo · 03-05-2020, 04:03 PM

When you did that, did the piston move up and down once per revolution? That's what it's supposed to do, move up and down on it's own. If the piston moves up but not down, then you have a broken connecting rod.

adamq72 · 03-05-2020, 04:15 PM

Quote:

Originally Posted by slonomo

When you did that, did the piston move up and down once per revolution? That's what it's supposed to do, move up and down on it's own. If the piston moves up but not down, then you have a broken connecting rod.

Yes, it'll move up but not back down.. is that something I could fix with a youtube video as a guide, or would I be better off taking it to someone?

CP241 · 03-05-2020, 04:28 PM

You've got a broken connecting rod. Time to open the motor. You shouldn't be able to move the piston with the dowel rod.

If you're comfortable rebuilding a motor, just get a service manual for specs and clearances. If not, I'd call don plowman and have him rebuild it, or buy a motor from him

adamq72 · 03-05-2020, 05:31 PM

Ok, thank you everyone for the help

Dave in VA · 03-05-2020, 06:29 PM

G16 engine parts...

http://www.buggiesgonewild.com/showthread.php?t=148069

slonomo · 03-05-2020, 07:28 PM

Time for a clone upgrade

03-04-2020, 07:22 PM	#11
adamq72 Not Yet Wild Join Date: Mar 2020 Posts: 12	Re: 99 G16 not firing, clutch spinning Pulled the gas line off the carb, and no fuel coming out at all when I press the accelerator. This would lead me to replacing the fuel pump, but anyone have a clue what the very loud banging sound was that started this?
adamq72 Not Yet Wild Join Date: Mar 2020 Posts: 12

03-04-2020, 08:16 PM	#12
CP241 Nincompoop village idiot Join Date: Apr 2018 Location: Michigan Posts: 9,690	Re: 99 G16 not firing, clutch spinning That doesn't sound right to me when it spins. It sounds like either the clutch is spinning on the crankshaft or the engine has zero compression (broken rod maybe)? Can you remove the spark plug, and stick a wooden dowel or something in the spark plug hole (something long) and slowly turn the clutch by hand. Verify the dowel moves up and down, this tells me the piston is moving. If so, remove the valve cover and see if the valves are actually moving when it spins? That will answer a lot before you go buying anything. If both the piston and valves are moving, rent a compression tester from your local auto parts store (its free) and check compression. To me, that motor just spins waaaaay too freely for it to be right. But it doesnt cost anything except a few minutes to prove me wrong

03-05-2020, 04:03 PM	#15
slonomo Searching for The Way Join Date: Oct 2009 Location: Medina, Ohio (NEOHIO) Posts: 11,442	Re: 99 G16 not firing, clutch spinning When you did that, did the piston move up and down once per revolution? That's what it's supposed to do, move up and down on it's own. If the piston moves up but not down, then you have a broken connecting rod.

03-05-2020, 04:28 PM	#17
CP241 Nincompoop village idiot Join Date: Apr 2018 Location: Michigan Posts: 9,690	Re: 99 G16 not firing, clutch spinning You've got a broken connecting rod. Time to open the motor. You shouldn't be able to move the piston with the dowel rod. If you're comfortable rebuilding a motor, just get a service manual for specs and clearances. If not, I'd call don plowman and have him rebuild it, or buy a motor from him

03-05-2020, 05:31 PM	#18
adamq72 Not Yet Wild Join Date: Mar 2020 Posts: 12	Re: 99 G16 not firing, clutch spinning Ok, thank you everyone for the help
adamq72 Not Yet Wild Join Date: Mar 2020 Posts: 12

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03-05-2020, 06:29 PM	#19
Dave in VA maintaining a low profile Join Date: Oct 2009 Location: SW Virginia USA Posts: 6,316	Re: 99 G16 not firing, clutch spinning G16 engine parts... http://www.buggiesgonewild.com/showthread.php?t=148069

03-05-2020, 07:28 PM	#20
slonomo Searching for The Way Join Date: Oct 2009 Location: Medina, Ohio (NEOHIO) Posts: 11,442	Re: 99 G16 not firing, clutch spinning Time for a clone upgrade

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