Couple of quick points: 1. the Odyssey, or FL350R. This was 30 years ahead of it's time. Fast as greased owl crap, reliable, stupid fun. Never took off. Fast forward to the RAZR which was just replicating the FL350R. What would Honda have done with it if it took off in '85? 2. Everything about the ATC. Reliable, good power for small displacement, easy to work on, simple front to back, still running 30 years later. My son's 185s is 36 years old and outran a 400 Big Bear the other day until it ran out of gearing and the Big Bear caught it around 50 mph. I can dig a 110 out of the weeds and as long as it has a little compression, I'll make it run in 2 days for about $20. Can't do that with a Yamaha 225. 3, 1981 250R. What happens if you stick a CR250 2 stroke in a trike? Yeah, a death machine. Then by '85 the 250R had a 6 speed and would do 70 from the factory. Death Machine +2. The 250R gave birth to the trike racing circuit. 4. The ATC 70. Small, quiet and reliable. Just never took off. Gave birth to the entire small displacement chinese quad market. 5. 82 200ES - first Big Red. The BR single handedly created the UTV market as we see it today in the Ranger, Mule, etc. 6. The ENTIRE chinese quad market in front of us today came from expired Honda patents from the 80's. 7. 300 fourtrax. By far the most coveted 4x4 in the market right now, absolutely indestructible. Pick one up a couple of years old, stick massive wheels and tires on it, and you have a mud machine. Kinda like the Polaris or Can Am...but reliable. And cheap. To be fair, Yamaha, Suzuki, Kawa, all picked their game up along the way and make good ATV's. I'll leave the Polaris/CanAm discussion for another day. While Polaris gave birth to the automatic, the reliability issues of both still exist today. While great ATV's, I don't consider them any more than specialty machines. FIGHT ME. or debate...whichever is easier.

That all depends on the color of the smoke. If it’s black smoke then it’s just the choke and a cold engine. If it’s a stuck ring which would be unlikely and more so valve seals then the smoke would blueish. Basically oil is seeping through the valve seal and making it’s way into the cylinder head and burning off when you fire it up.

Honda fan here ! Love em all but biased when it comes to Honda! 🙋🏻‍♂️

an't fight you on that .. My own quad is a 1991 Fourtrax 300FW. Does everything I want . Bought used 6 years ago.. Only repair I've needed to do on it is replace the rear axle due to worn out splines at the hubs. and replace front brake shoes. Still runs strong and not burning oil. Yamaha, Suzuki and Kawasaki are also all good machines ; as well as the Kymco machines.. I know some swear by Polaris but around here most swear at the older ones ..They're nicknamed "Pullhairis" by the ones I know that have had one in the past . I don't know how the newer ones are because nobody I know has one ..

Frank has a good idea of checking the valve seals. I had a Suzuki quad 300 that would smoke at times. The compression checked out good, leak down test showed acceptable. Spark plug showed good as well. What I found was the exhaust valve guide was worn just enough to let some oil get passed it and get sucked into the exhaust port. The heat from the exhaust burned the oil in the exhaust pipe. Found the exhaust port wet with oil. The exhaust valve is covered in oil on the head when running. By the time you replace the valve and valve guide and seal. You could have bought a good used complete head cheaper. So look at your spark plug, if it has oil do a compression test and leak down test. If all of those are ok, remove the exhaust pipe and look for it to be wet with oil.

What’s happening is most likely your valve seals are bad and maybe your rings are going as well. The valve seals are bad allowing oil to get into the head and is prob fouling the spark plug as well. The spark plug should be a dark black color with this condition. Take a compression reading first and see what you have. Then order a new set of valve seals and gaskets. I would replace the rings as well. This should solve the problem. The piston is probably fine but while your in there might as well. I know some people don’t want to spend the extra few bucks but it’s worth it if the bike is in good condition. A good cleaning of the carburetor would be good since it’s going to come off the bike anyway during this process.

Agree with Brian. Before you pull the top end apart, check the timing to be sure the chain hasn't jumped. If it has, might be a stretched chain or tensioner problem.