I purchased the monster 90 4 stroke bike engine kit from gas bike and it has been nothing but problems for me. First off I wasn't getting a spark so I replaced the ignition coil and sparks just fine now. Next I found out that they never sent me a centrifugal clutch with my kit so I called gasbike and talked to steve and he tried making it sound like I have no idea what I'm talking about, but I've been building bikes for over 10 years. He told me I placed my order over 30 days ago so the warranty is up. I didnt know there was a warranty on parts that I never received with the kit. I ended up buying a new clutch for 30$. Now I got the bike completely assembled and found out that the screw on the carburetor to govern the fuel looks like it was cut off and someone filled the hole with some kind of glue so now the engine runs rich and floods the cylinder so I ordered a new carburetor for 20$. All together I spent around 70$ on missing and defective parts that came with the kit. It's kinda hard not to think someone purposely sabotaged this engine kit and this was my first and definitely last time doing business with gasbikes.net