|We started the
search with one of the oldest third party manufacturer of pistons for MX bikes, Wiseco.
Wiseco did make pistons for the KTM 250. The piston was a common design from 1977 - 1982.
Wiseco had stopped mfg of the part in 1985 but the were able to supply the part number
required. The Wiseco part number was 416P2 (2=.2 over) and the 2815LC ring set. Wiseco
parts were distributed worldwide so some old stock may be found in the UK.
Since KTMs were known as Pentons in North America until 1978
we decided to check the parts sources documented by the Penton Owners Club. A number of
parts sources are listed on the web at www.pentonusa.org.
We contacted John Fischer at Fischer Competition Cycle. John has been in the business for
over 40 years and has a good stock of OEM parts for KTM/Pentons. John has a Wiseco 416P4
piston and ring set. This is a second over unit but if it is all that is available you
will have to bore the cylinder to match. Fischer Competition can be contacted at:
Fischer Competition Cycle
744 Pittsburgh Road
John also has parts for Sachs/Hercules, Husqvarna, Hodaka and Can Am Motorcycles.
We also asked H&H KTM to check KTM USA for
availability of the 1st over factory piston set (Pn: 55.30.007.200). We will update the
answer once we get a confirmation of the parts availability from H&H.H&H can be
contacted at www.ktmworld.com.
The MotoXmuseum also received the following email
from Reinhard Schrem at S.D.I. Motorradtechnik. I saw on your web site that someone is
looking for a KTM piston from 1978. The part number he requested is from a 400 model, not
a 250. The 250 has the bore 71, the 400 80,81 or 82. If this person still needs such a
piston, I can deliver new 250 and 400 pistons. Cost about 250-300$ plus delivery costs.
They are original KTM. My E-mail is firstname.lastname@example.org