my yamaha aerox 50cc has just had a service and had a new kick start and spark plug fitted and new rollers but when i leave it outside longer than an hour it doesnt seem to want to start and has trouble starting i try just the electric start and then try choke when doesnt start first time
knowing the aerox the head gasket is probably knackered ,if it is then fit a genuine one as pettern ones turn into a bubble gum type of material after about a week
adam bike doctor( of milton keynes motorcycle centre), October 2012