Author Topic: Pistons?  (Read 821 times)

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Offline Paul Harris

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Pistons?
« 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

Offline ozktm

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Re: Pistons?
« Reply #1 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/

if Andre doesn't have what you need, contact Al Beuhner : 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.
Regards,
Adrian Goold #101

'72 KTM 175 |'74.5 KTM 250 |'74.5 KTM 400 |Hagon/KTM 250 proj|'76 MC5 250 Project |'76 MC5 400|'78 KTM 250 Project |'81 KTM 250 MC | '81 KTM 495 MC

Offline Paul Harris

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Re: Pistons?
« Reply #2 on: January 27, 2017, 05:29:29 PM »
Thanks for the advice Adrian.

Offline Tim37

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Re: Pistons?
« Reply #3 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 .....

Offline oz555ktm

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Re: Pistons?
« Reply #4 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
« Last Edit: February 22, 2017, 10:35:01 PM by oz555ktm »
And Please forgive me as I cant Spell for Shit ...
And I have very Bad Gramer ...too I been told ......

Offline YUMASTEPSIDE

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Re: Pistons?
« Reply #5 on: February 25, 2017, 06:49:08 AM »
....you can also try seven4racing.com.....they're good to deal with

                Roger

Offline Paul Harris

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Re: Pistons?
« Reply #6 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.

Offline Gippslander

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Re: Pistons?
« Reply #7 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"

Offline Paul Harris

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Re: Pistons?
« Reply #8 on: March 28, 2017, 10:17:00 PM »
I got a 71.5mm 2 ring piston from Al Breuhner - having it modified to fit