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Old 08-18-2009, 01:48 AM
restapukin restapukin is offline
Motorized Bicycle Elite Member
Join Date: Jul 2009
Location: australia
Posts: 112
Default Re: new motor break in

i think i'd start by checking for air leaks on the intake side - carburettor etc, intake head gasket; guys do this by spraying wd 40 around the sus area of the intake while it's running at a constant fast tickover & listening for a change in engine note

you have to contrive to avoid the wd 40 getting into the actual airfilter intake of course

trying another sparkplug & checking the gap at the same time is always a good idea too....
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