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Spring steel it is. The beauty of spring steel is it's resiliency. I am using a grade that is more prown to deforming than breaking. The new disign I have uses two parallel spring steel bars, and so far, it is holding up well. The key is to allow enough length for the spring to flex without...

Through my tests, I was noticing the 1/4 bolts bending. Never had a failure, but I have since moved to 5/16 grade 8. As for how narrow the frame is, not sure how safety is affected there. As for the crimped bends, all my proto work is done with extremely low cost 1" electrical conduit. Very...

Very interesting engine. Do you think they are making their own engine block, or simply moding out a Briggs or Tecumseh block? I knew about the Yamaha and other racing 2 stroke engines, but those will eat you alive with additional running costs (starter, clutch, exhaust, etc). Russ Barrow...

I am curious to what you consider unsafe. I have addressed a few weaknesses as mentioned earlier, but what do you think you see. A role cage may seem obvious, but when designing for compactness and weight, the best I can provide is a seat hoop. Also, it is important to note, they do not make...

I have not seen any 2 strokes from Lifan. Lots of 4 strokes from 50cc to 250cc, but even the small ones start around 50lbs, and have very little power. Do you have a website link? Russ Barrow Russell ATV

Russ, Good name. I see you dabble quite a bit with the Lawn Boy 2 strokes, but I have seen how these can be a bear to convert to karting (carb, PTO, etc). With 2 strokes almost exstint, can you recommend a viable (sustainable, cost effective) 2 stroke solution in the 5+HP range. I found some...

IBNZ Monkey, I have used that brake on a number of karts, and I honestly hate it. It is cheap, and I have not found another good low cost solution, but once you play with it, you will understand why. First problem, is that the spring return is now worth anything. Plan to build a spring...

Thanks, that is what I need. Please keep in mind these are early versions that represent test mules only. I can typically build a new frame a week, resuing the important bits, improving the design dynamics, so i do not waste time making it pretty. I will also be recieving my first shipments...

Awesome kart, but if may be the first kart I have seen with a rollcage for the engine. Cut that cage off for a true vintage kart. If you fill you need roll-over protection, bend a hoop that goes behind the seat. Drives firm like a kart should. On the high side, the thing should corner...

Is there anyway in this forum to attach pics, or does everyone go to their web based hosting service of choice? I have not used Flicker or other sites in a while. What would be quick and easy? The idea I am referencing is based on a flat spring steel suspension. It has taken me several...

Instead of redoing the spendles and changing the castor angle, another way to create a self centering sterring is to incline the Kingpin. Some people call this Kingpin Inclination (KPI). Do a search on the term, and it will give you the basics. I would suggest between 15-10 degress for speeds...

Nice little throttle kit, makes for a simple and clean setup. One note, if you go to AGK's website, they provide a simple little trick to bypass the governer (a must for that lively Clone Engine). Also, for what Modelengineer noted earlier, I must agree, you need to support that shaft...

Looks like a serious frame. I really like what looks to be your rear drive member. The engine of a wrecked bike is a good candidate, almost insuring it was running when it was crashed. I cound not tell if it was water cooled, but at that size, very likely. It will make the build a bit more...

Hello, My name is Russ Barrow. I have been a karting man since I was 12 (Carter Brothers Kart my parents bought me for Christmas) and it never really left my system. I have been messing around with Combat Robots for the last few years, but have come back to the joy of building and riding. I...