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scrapveiw February 17th, 2008 06:48 AM

1994 501 conrod?
hi does any one know where i could get a 1994 501 conrod?

big end pin 30mm

rod width 18mm (between webs)

rod length center to center 125mm

wrist pin 20mm

i have a ktm 525 rod but this will take some considerable machining to fit the webs
and i would have to use a 4mm spacer under the barrel as the rod is 4mm longer.

then :?: you start to get into timimg chain length problems and the need to fit a half link.

Q does anyone know who sells half links , the chain is brittish standard size (3/8 by 3/16 roller)



Taffy February 17th, 2008 09:22 AM

RE: 1994 501 conrod?
surely the early 550 rod would do you? look in the doc under tuning....



scrapveiw February 17th, 2008 10:37 AM

yes , it would have done nicely if berg had kept the same size big end , but my crank pin has the missfortune of being 30mm, and later bergs seem to be 32mm.unless anyone has a source to get early berg bits , i am a bit stuck.
i can get an xr400 rod 32mm big end pin ,20mm little end pin, but it is 2mm shorter at 123mm.(may be of use to later berg owners)
i can get a husky rod that will fit but is 8mm longer and has a wrist pin size of 22mm
i can put a bush in the little end, but i would prefer something a little closer to the original and more readily available ,hence radically modify the crank to take the ktm 525 rod with the stronger 35mm con rod pin. i would bore the crank webs to take a berg 32mm pin but they are absolutely rock hardened and my machine cutting tools wont touch them .

i just wish the parts back up was a little better for bergs of a certain age,



BOSS February 17th, 2008 09:07 PM


We have a few of these in stock,part # is 210-058-01

We can ship it to you let me know!

scrapveiw February 21st, 2008 04:48 PM

thankyou very much for the offer ,but i bit the bullet and got stuck in before i read your message :oops: ,did some machining and put the ktm rod in , i am now waiting for a half link to arrive that i found on ebay .

incase you were wondering about the difference in big end pin size, i bought a 30mm i/d ,35mm o/d sollid carbon steel inner roller bearing (£5 from simply bearings ltd) this gives me the correct o/d for the ktm bearing and it is a good tight fit on the original sized 30mm pin,( i used a rover diesel gudgeon pin 30mm o/d and very strong)

i also had to machine 2mm off each crank web inner flank as the ktm rod is 4mm wider.

it did'nt take much ballancing either due to the metal i removed from the inner webs.

well ,someone had to try it,

i will let you know the result in a few days.



Neil_E. February 22nd, 2008 08:36 AM

Just curious, how much tonnage does it take to push the crank pin in or out?

scrapveiw February 22nd, 2008 11:23 AM

that depeneds on a lot of different factors, even how hot or cold the environment is , i use a 60 tonne press and the gauge doesent realy register much under 5 tonnes , so i am guessing my crank would be below 5 tonnes to press the crank ,
i am curious now ? why do you ask?



Neil_E. February 22nd, 2008 04:08 PM

Only curious since I was talking to a dealer who sends his cranks out and said it took a huge press to do the job.

scrapveiw February 22nd, 2008 04:27 PM

i doubt it would take any more than 15 tonnes to press a bike crank unless the tolerance's were incorrect, most presses are a minimum of 15 tonnes,but will press beyond their rated tonnage depending on how brave you are feeling.i used to use a 15 tonne press and always managed to do bike cranks with it.
to be honest i don't really look at the gauge when i am pressing you tend to go by feel and the sound of it creaking as the pin goes in or out, and you are normally too busy making sure the crank is pressing together correctly and not skew wiff.

hope this helps



Taffy February 23rd, 2008 12:00 AM

ha! ha! ha! skew wiff!

that means not straight neil!

soeone told me that if you need more than 20 tons you are distorting the metal and it will be LESS LESS strong....



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