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Old 02-27-2016, 06:15 PM   #1
scooterbear   scooterbear is offline
 
Join Date: May 2015
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taotao 139qmb

just put in goofit big bore 100cc kit on my scooter but did not replace the oil pump. scooter starts on occasion but i am getting a vacuum when i unscrew the oil dip stick is this because of the oil pump not being changed out



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Old 02-28-2016, 04:57 AM   #2
bull   bull is offline
 
Join Date: Feb 2015
Posts: 257
No, the oil pump will not cause a vacuum in the crankcase.
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Old 02-28-2016, 12:54 PM   #3
scooterbear   scooterbear is offline
 
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so what will cause a vacuum on the crankcase



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Old 02-28-2016, 09:57 PM   #4
bull   bull is offline
 
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I seriously doubt that you have a vacuum in the crankcase, you most likely have a pressure build up which is normal on these scooters.

But, if I am wrong about there being a vacuum. then that would imply that the vent on the cam cover is sealed as well as the valves and you are trying to pull air into the combustion chamber past the rings from the crankcase side.
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