gas bike.net is the absolute worst business in California , they sell garbage (resell china products ) they do not ship stock parts most of the time its a cheap replacement part that doesn't quite do the trick (like exhaust studs , head studs ) they sell an engine called a Raw Racer it comes with a RSS reese high compression head that is about 1/8 inch thicker then the standard head . this head requires longer head studs , using the supplied studs can strip the hole in the crankshaft that drives the head stud. (speaking from experience)they do not support what they sell . these idiots lie , i ordered some part they took a week to even process my order , i asked for a refund and the next day they sent it out and putting the blame on the wildfires near LA delaying the mail. they refunded part of my money , (not the shipping cost) then when i reported them to the california state attorney general they lied to them and claimed that they refunded my full purchase , they even claim that they returned my shipping money in which they did not , they lied to a government agency , anyone to do business with this crappy company is a total idiot i speak from experience and i advise everyone to steer clear of GAS BIKE!