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I bought this engine a couple years ago - a Roper 140. Cox (the same company that made model aircraft engines) made these engines in the 1960s, and later sold the manufacturing rights to Roper. They are identical except for the label on the pull start cover. They were used on chainsaws - the Cox...

After a long hiatus in building, I've built a minibike so I could put my Sachs ST96 engine to use. I tried to get away with not having a jackshaft, but the gearing was too high. It now has a 9:1 reduction, top speed is 28 mph. I had a cheapo pocket bike tank lying around, so I cable tied it on...

This is a project of mine that has been going on for a couple of months, but only now am I mentioning it on the forum. The plan was to build a standard motorcycle with a 6.5hp clone and a torque converter. I built it with 3/4" and 1/2" pipe and used a Harbor Freight pipe bender to make the...

What could go wrong? :roflol: Had a 18cc Weed Eater hedge trimmer that I didn't really have any use for, so I did a bit of modifying so that I now have a little 14" chainsaw. I have had it running the chain with no load fine, but the clutch will slip when trying to cut anything. I am pretty sure...

After what seemed like a million years, I finally have my kart painted and I am putting the bodywork on so it can be smoothed out, then painted. The kart now has a torque converter instead of the centrifugal clutch it had before, and I am very happy with its performance. I wanted to have a cool...

Hi, I need help identifying this go kart frame. My brother bought it a couple of months ago and planned to restore it, but it has been sitting in the backyard (rusting) ever since, so I decided to try get it back together. I was just wondering if anyone knows if this is a certain brand of kart...

I bought this engine a couple days ago. It's a new old stock Sachs Stamo 96 (93cc) two stroke. I have already run it and will post a video soon. It has a 15mm shaft, so it might be difficult to find a clutch that will work for it. It's rated 3.7 HP at 5000 rpm. I was wondering if anyone else...

I've made this "low precision" X-Y table for my Harbor Freight drill press. It has 1" of Y travel, and 4" of X travel. The leadscrew is just some 3/8"-16 threaded rod, and the axes slide on 5/16" rod. Still not finished, I need to make a little vise for it. I haven't tested it out yet (I need to...

My brother and I have decided to put his Harbor Freight 99cc Predator engine on a chopper bicycle frame that has been sitting around in our garage. Luckily, I don't have to pay for any of the parts. We have already ordered sprockets, chain, and clutch. A 10 tooth clutch will run to a 20 tooth...

Well, I am new to this forum, but decided I would post a question about my go kart build (in the style of a vintage car). I have driven the kart long ago in August, but I had built the thing way before my mechanical and engineering skills began to take root. Everything on the kart then was done...