OzVMX Forum

Marque Remarks => KTM => Topic started by: Paul Harris on January 26, 2017, 05:53:23 pm

Title: Pistons?
Post by: Paul Harris on January 26, 2017, 05:53:23 pm

I've decided to do a top end rebuild in my '82 250MC. It's standard bore so 1st OS...what's the best choice for piston? Are those aftermarket reeds worth it?

Thanks, Paul

Title: Re: Pistons?
Post by: ozktm on January 27, 2017, 06:52:07 am

You will be able to use a '73-81 type piston, just needs modifying to have the reed holes etc to match the original.
I think Boyeson dual stage reeds are available, a new set of reeds can't hurt especially if you don't know how old they are, else go for the v-force upgrade, other posts are probably on this forum about them as the yamaha and honda guys are using them.

Try Andre's  site for the piston : http://www.enduroklassiker.at/ (http://www.enduroklassiker.at/)

if Andre doesn't have what you need, contact Al Beuhner : http://www.pentonpartsusa.com/2A%20KTM%20engine.htm (http://www.pentonpartsusa.com/2A%20KTM%20engine.htm)

else contact me, and ill sort a piston kit out for you so its ready to go.

Title: Re: Pistons?
Post by: Paul Harris on January 27, 2017, 05:29:29 pm

Thanks for the advice Adrian.

Title: Re: Pistons?
Post by: Tim37 on February 21, 2017, 09:05:37 pm

I too have an Air cooled 82 cylinder that I wish to fit to my 81 250 gs ......pistons are not readily available for the 82 reed setup ....I think modifying the piston port style piston i the only option ? anyone else know where  the Rv piston with two round holes can be found .....

Title: Re: Pistons?
Post by: oz555ktm on February 22, 2017, 10:29:39 pm

ANDRE HORVATH'S KTM KLASSIKER ,   He is Number 1 for KTM stuff ....

http://www.enduroklassiker.at/

Hear is ya Piston ...

http://www.enduroklassiker.at/en/engine-parts/2237-kolben-250.html

Title: Re: Pistons?
Post by: YUMASTEPSIDE on February 25, 2017, 06:49:08 am

....you can also try seven4racing.com.....they're good to deal with

                Roger

Title: Re: Pistons?
Post by: Paul Harris on March 03, 2017, 05:25:13 pm

Thanks Roger - not have much luck with a single ring 1st OS piston...I'll look them up.

Title: Re: Pistons?
Post by: Gippslander on March 04, 2017, 12:17:27 am

sent seven4one racing an email enquiry a week ago - no answer as yet - must have "gone racin"

Title: Re: Pistons?
Post by: Paul Harris on March 28, 2017, 10:17:00 pm

I got a 71.5mm 2 ring piston from Al Breuhner - having it modified to fit