I am running the new DAX Titan 50cc 4 stroke. IT is a Fantastic 4 Stroke. It is state of the art. Super Quite, Super Smooth, And Super Fast ! I hit 41.7 mph yesterday with a 36T. I have almost 1000 miles on it. My valve cover gasket was leaking but I did the valve adjustment and replaced the gasket and now it is tight. Engine weighs only 12 lbs or so. Auto Clutch is wet with 10 T power take off. This set up is compact and super reliable. Runs cool since it it wet clutch. There is no other Engine Carrier like this one. This Engine carrier puts carb to the front and Exhaust to the rear. This is a superior set up for sure. Allows you to keep your right hand on throttle while pulling with your left. This is the ideal set up. Drive is chain and mounts using standard rear sprockets same as for the 2 strokes since the drive is on the left side. Carrier mounts in such a way that the bike can have solid or quick release axle for the rear. Currently still testing this new setup. I would like to have 2000 miles on this setup to make sure reliability is good. So far at almost 1000 miles, no problems at all, except the minor oil leak. Factory over torqued the valve cover and squished the gasket out. As soon as I get close to 2,000 miles, and all is well, then I will sell this special 4 stroke with unique carry system. Parts come from USA, Japan, Asia, and Europe. Most parts are from USA and is assembled here in USA. The Carrier system is all USA. Made in USA !!! This is a very exciting break through in small engine power with carrier system. This system is so new and great that it is certified by US Copy Right Office and Patent Pending. There is no other system quite like this one. I am loving it and at almost 1000 miles now I look forward to racking up a ton more. At the Current rate of progress and testing, I am confident this system will be offered for sale in the next 5 to 6 weeks. Not sure of the price yet. I am Guessing somewhere between 300-400usd. If I can get enough of them built, I am hoping the price will be lower towards 300usd. We shall see. This is very very exciting !!! I am loving this new 4 stroke !!!! Wow !!! Enjoy the ride !!!!