Added reply in a thread frame temper 5/23/2013 1:40 PM

That depends on the alloy, so you cannot say that is the same for all frames. I believe (source: AJ from SH on this forum) that the different castings and extrusions are made from different alloys. Bottom line if you have to weld critical components ... more »

Added reply in a thread frame temper 5/23/2013 7:56 AM

That is an unwise thing to do. You have a good insurance I hope because you risk fracture occuring in the heat affected zones from the weld. Have you done material and FEM analysis and to examine the stress occuring in that area? If you read literature ... more »

Added reply in a thread frame temper 5/16/2013 4:50 AM

Based on what experience and knowlegde? it depends on the aluminum alloy used. Almost all high strength aluminum alloys require annealing after welding. This includes pretty much all motocross frames.

Added reply in a thread This week's Classic Steel is a look back at the 1992 CZ125MX 5/2/2013 1:40 PM

Awesome job on these articles! I really appreciate the work you put in making these articles and digitally conserving pieces of motocross history. The technical details which you describe and HQ photos make it for me worth reading.

Added reply in a thread Italian 125 Racing 3/23/2013 4:22 AM

I think you mean CRM Compositi

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Added reply in a thread Marvin 3/11/2013 5:26 AM

Awesome job Marvin, congratulations to Marvin and Mathilde! A very touching picture:

Added reply in a thread Polishing Aluminum Frame 3/8/2013 12:33 PM

If you scrub with a scotch brite pad, use WD40 as a lubricant. It works wonders!

Added reply in a thread KTM 350 disadvantage at Daytona 3/8/2013 9:45 AM

100cc disadvantage? I believe these guys will disagree

Added reply in a thread Is it completely safe to PowderCoat a steel frame? 3/2/2013 4:42 AM

Source: AJ from Service Honda. He typed on this forum that Honda uses an alloy comparable to 7075 on (I believe) extrusions. This is not based on my own experience. If incorrect, my apologies.

Added reply in a thread Is it completely safe to PowderCoat a steel frame? 3/1/2013 3:53 PM

Thanks for the remark Harescrambled! I didn't know that. Then it would be no problem for steel. For aluminum it is however dangerous if the heat treatment of the alloy is critical.

Added reply in a thread Is it completely safe to PowderCoat a steel frame? 3/1/2013 1:53 PM

Some info about 25CrMo4 which your KTM is made of: http://www.saarstahl.com/fileadmin/saarstahl_extranet/images/04_produkte/walzstahlsorten/english/7218_25CrMo4.pdf I would suggest not to go above 400 degrees Celcius for more than 0.5 hours.

Added reply in a thread Is it completely safe to PowderCoat a steel frame? 3/1/2013 1:50 PM

Aluminum frames are heat treated. If you heat an aluminum frame to a temperature at around 200 to 300 degrees Celcius the effects of heat treatment will be reduced (the material recovers to its original, soft, stress free state) depending on the alloy. ... more »

Added reply in a thread MXA: Jody’s Manifesto Of An Unrepentant Two-Stroke Aficionado 1/2/2013 11:08 AM

A 2012 KTM 250SX two-strokes costs $6695 and the 2012 KTM 450SXF four-stroke costs $8795. That $2100 price difference could finance your whole racing season. This. How many top-ends can you do for $2100? A new piston every 25 hours using good fuel (we ... more »

Added reply in a thread This week's Classic Steel is a look back at the controversial 1997 Honda CR250R 12/28/2012 4:23 AM

Thank you for publishing these articles! They are of awesome quality I think, also from an engineering standpoint

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Please keep up the good work, I always look forward to new articles
Added reply in a thread 2012 CR250 AF 12/27/2012 11:55 AM

That vid just brought a smile to my face. Awesome, I love it! The bike looks awesome to but I can't help wondering how a Akrapovic or Scalvini silencer would look on that bike

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Added reply in a thread Welding an Aluminum Frame ? 11/8/2012 3:03 AM

I would be very careful from who you take advice from. What I would suggest is contact Honda and ask them for advice. Maybe contact Service Honda.

Added reply in a thread Frame preference: aluminum or steel? 10/28/2012 10:33 AM

My guess is that the frames are pretty solid, designed for an average rider. Propably goes through a history cycle of loading. I have no idea about the FEA numbers, Pursang www.pursangmotors.blogspot.com) have made their own aluminium frame. I would love to have their information

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Added reply in a thread Frame preference: aluminum or steel? 10/28/2012 8:29 AM

A thread can never have enough semi-dressed women.

Added reply in a thread Frame preference: aluminum or steel? 10/28/2012 7:16 AM

The frame you personally would prefer depens on a lot of factors. One cannot say it for you. It depens on your weight, length, riding style, conditions, power, torque, center of gravity and the list goes on. There is only compromise.

Added reply in a thread Frame preference: aluminum or steel? 10/28/2012 6:54 AM

I am not trying to be an ass, but some things you state are incorrect. Aluminium is not cheaper to produce per se. Aluminium can be a pain in the ass to machine because aluminium sticks to your tools, many cutting tools for aluminium are polished to

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