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150cc GY6 and Under Engine Tech GY6 and Smaller Technical Discussion Forum

 
 
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  #1  
Old 05-30-2020, 08:36 AM
binkerton binkerton is offline
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Default Not enough compression?

What is the minimum amount of compression needed for the 150cc? I bought a tester the other day and checked mine cause I still haven't figured out why it wont run and it is pretty low but it seems like it should still be enough to fire, maybe I'm wrong.

The reading I got was 105psi. It's the rings or cyl wall cause the oil trick bumped it up to over 150psi.

Would that low of a reading cause it to suddenly stop running? Because that's pretty much what happened. I never seen a gradual decline in power. It just quit.
  #2  
Old 06-01-2020, 12:43 AM
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metalstudman1 metalstudman1 is offline
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IMO you have enough compression for it to run @ 105psi.I got plenty with a lot less running & smoking!! If my engine just up and quit I'd be looking for a disconnected/broken wire or blown fuse.Do you check for spark?If no spark- I would check all my grounding wires first- put a jumper ground straight to the coil ground terminal,I'd make sure the electrical system is grounded to the chassis & motor via another temporary jumper. If you have spark then is going to be fuel related-carb/petcock/tank.
 


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