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2016 Coolster 125cc irratic starting

  #1  
Old 01-07-2019, 07:09 PM
Weekend Warrior
Thread Starter
Join Date: May 2016
Posts: 8
Default 2016 Coolster 125cc irratic starting

Inquiring about starting on our 125cc Coolster. New Coil, new Carb, fresh gas... Unit will turn over , shows good spark and fuel delivery.
Will not start unless jumped from another vehicle.???
 
  #2  
Old 01-08-2019, 02:26 AM
Extreme Pro Rider
Join Date: Oct 2013
Location: Lancaster England
Posts: 3,668
Default

Fit a new plug, next set the valve clearances. If it is still bad to start check compression, under 90psi and you need to remove the head and cylinder, and start measuring ring, bore, and piston wear, and valves and seats for pitting and burning.
 
  #3  
Old 01-09-2019, 05:45 PM
Weekend Warrior
Thread Starter
Join Date: May 2016
Posts: 8
Default Coolster Not starting good

Thanks for the quick reply. This will give me something to go on...
 
  #4  
Old 01-10-2019, 03:03 AM
Extreme Pro Rider
Join Date: Oct 2013
Location: Lancaster England
Posts: 3,668
Default

Re-reading your post, it could be a bad battery or connection, does the engine seem to turn slowly if you try to start it without the jump leads?
 
  #5  
Old 01-10-2019, 09:13 AM
Super Quad Patrol
Join Date: Aug 2013
Posts: 1,938
Default

ya i was going to say battery. The little battery's in these toys are just enough so when they start going bad it does not take much. When is the last time you had the battery on a maintainer?
 
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