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Excellent questions, I am wondering this too! Your bikes are awesome! Keep up the good work

I was wondering how does Service Honda heat treat their rewelded frames? Do you heat treat them locally using a torch or do you place the whole frame in an oven? Can you also tell me of what kind of Alu those frames are made of? Is it a 6000 or 7000 alloy? I have no intention of beginning a...

Thank you for the reference I can see these people are not making wild guesses there. But I am not fully convinced because I fail to see the effect of rotating mass moving in liniear motion on a stick. In this case the stick represents the motorcycle itself. But I must admit I do not know how to calculate...

Imagine a 250 or 125, it would sell like hot cakes Haha this is turning in another two stroke thread. Only a fool would say two strokes are dead.

hehe yeah I know Thats why I mentioned Ossa pretty easy job for them, buy yamaha's, cut and weld the frame, heat treatment and you are set

Yamaha propably wouldn't make it. But TM, GAS GAS, Sherco, Beta, Ossa, KTM (look at the KTM SX65) or Husaberg wouldn't have a problem with it. I am quite sure a crazy Swede, Spaniard or Italian already has some smart and creative ideas running about a radical two stroke design.

That would be very good! Even better when you place the gas tank on the place where the airbox normally is. But then you would have some problems with the expansion chamber.

Do you have an reference to that?

I neither have the purpose of getting into a pissing match To be honest I havent thought about the weight of the muffler when making the statement about the CG of the exhaust. In that case you are right. About the springs, the actual mass that is unsprung is theoreticly one third of the mass of the spring itself...

Hmm I disagree since the place of the exhaust is pretty much at (or very near) the center of gravity on a bike. Making the exhaust lighter will actually put the CG higher on the bike because of the weight of the fuel tank. I must say this is an assumption based on my technical knowlegde so if you can...

Why the exhaust? You are better off saving unsprung weight like mentioned above.

By the way, the above is all at your own risk

The smartest thing to do to improve your handling by reducing weight is reducing unsprung weight. Unsprung weight is the worst kind of weight on your bike because it is constantly moving and affecting your handling. Some ideas from the top of my head: - Lighter tires (tubeless) - Lighter spokes (titanium) - CF (Carbon Fibre) chain guide holder and...

Mooie brommer Nederlander hier uit Lichtenvoorde Can you make some detail photos of the radiatorbraces and tank? I want to do a conversion like your bike myself. The difference is that I want to make the tank and airbox from carbon fibre using the lost foam method. I would really appreciate it

I believe the steel is called AISI-SAE-4130 Steel. It is very suitable for massproduction because it mostly doesn't require any heat treating after welding. And you can weld it with TIG and MIG using appropriate welding 'wire' (not sure what the right word is).

KTM uses 25CrMo4 for their frames. Which has the DIN code 1.7218, if you have any literature you may be able to find the Japanese code for it. I think the Japanese use a very similar steel. So this may give you an indication. http://www.matbase.com/material/ferrous-metals/cast-steel/gs-25crmo4/pr… Just out of curiosity, why do you ask? Are you an engineer?

Haha you guys see what you want to see. Its a 350

Well I wasn't leaning towards the more people argument. I mean the global mentality towards motorized vehicles and forthcoming from that motorized sports. That heavily influences one's decision to start with a motorized sport. But that doesn't count for some countries in Europe so it does not weigh as heavily as the other arguments. I personally believe the cost is...