Added reply in a thread Cosworth 4/12/2011 9:57 AM

Cosworth is one of the best high performance engine companies in the world. They have a very good heritage coming from the roots of formula one (they started in 1958).

Added reply in a thread 2 stroke bike porn 4/8/2011 8:04 AM

Excellent questions, I am wondering this too! Your bikes are awesome!

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Keep up the good work
Added reply in a thread 500AF For Sale 3/16/2011 11:58 AM

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

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Added reply in a thread Losing Weight 2/24/2011 11:19 AM

Thank you for the reference

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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 ... more »
Added reply in a thread Losing Weight 2/24/2011 10:00 AM

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.
Added reply in a thread Losing Weight 2/24/2011 9:55 AM

hehe yeah I know

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Thats why I mentioned Ossa pretty easy job for them, buy yamaha's, cut and weld the frame, heat treatment and you are set ... more »
Added reply in a thread Losing Weight 2/24/2011 8:38 AM

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 ... more »

Added reply in a thread Losing Weight 2/24/2011 8:05 AM

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.

Added reply in a thread Losing Weight 2/24/2011 3:49 AM

Do you have an reference to that?

Added reply in a thread Losing Weight 2/23/2011 3:02 PM

I neither have the purpose of getting into a pissing match

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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 ... more »
Added reply in a thread Losing Weight 2/23/2011 10:39 AM

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 ... more »

Added reply in a thread Losing Weight 2/23/2011 9:42 AM

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

Added reply in a thread Losing Weight 2/23/2011 9:04 AM

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

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Added reply in a thread Losing Weight 2/23/2011 9:03 AM

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:

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Added reply in a thread YZ250 2-stroke! 2/18/2011 8:52 AM

Mooie brommer

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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 ... more »
Added reply in a thread Yamaha YZ125 makeover 12/20/2010 7:56 AM

It is done in a workshop using YZ250F plastics. Propably making a custom subframe and making a custom tank. It's pretty obvious

Added reply in a thread Yamaha YZ125 makeover 12/20/2010 7:51 AM

It is done by a Dutch company, you will have to contact them to get information. But if you are creative you can make it yourself. You need to weld a fueltank and make a decent subframe. If you study the pictures you can see it uses the airboot from ... more »

Started new thread Yamaha YZ125 makeover 12/20/2010 3:45 AM

This is a makeover for the YZ125 to YZ250F plastics. It is done by http://www.vdlaarracing.com/nieuws.html

Simply beautiful if you ask me. ... more »

This forum thread has 27 replies

Added reply in a thread need info about frames 12/12/2010 6:28 AM

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 ... more »

Added reply in a thread need info about frames 12/12/2010 6:20 AM

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/properties ... more »