Which pistonm in 71mm clears the boost port on a TS1

[davidblythe]

Help

One Wiesco TS250 piston peg is too closse to the boost port
OEM KH750 are rocking horse sh*t
KX250 run in the boost port

does anyone know of another piston for a 116 rod 18mm small end

[RinB]

David
H2 750 I get here have to buy 3 but Ill have one off you, Im sure some one else on here will have one m8

https://www.z-power.co.uk/merchantmanag ... ts_id=1545

Let me know

Smiffy

[CT.]

I think you can get the Wiseco ones seperate on ebay.com .It's the same one used in the 475cc Kwak jetski (423m07100).

[byron]

I think those wiseco 423M07100 pistons have 16mm pin
individually they seem to $100 ish on usa ebay, so might actually be cheaper buying from z-power [and they're a good shop]
I'm after one for my 240 [ish] build, so would go thirds. standard size ?

[Powolotti]

Wiseco 423 (H2 750 and Jetski Bigbore) has the pins above each other and running in boost port, see my modified piston before repegging...

http://picasaweb.google.com/Powolotti/N ... 4679660482

Wiseco 439 needs no repegging with unmodified boost port, but uses 18mm gudgeon pin

[CT.]

Wiseco 423 (H2 750 and Jetski Bigbore) has the pins above each other and running in boost port, see my modified piston before repegging...

http://picasaweb.google.com/Powolotti/N ... 4679660482

Wiseco 439 needs no repegging with unmodified boost port, but uses 18mm gudgeon pin

Good tip powlotti.

I take it that the 423 will still be good if you intend to do an old school 240 iron conversion (unless boost porting) though ?

[Powolotti]

it´s a light piston, still extremely reliable. Perfect for that piston ported 240 - needs no repegging but longer rod. Just take care you don´t go mad with the top of the inlet, so the lower ring does not catch in it.

[davidblythe]

knew the wiesco kh750 piston ran the pegs in the boost port, why i wanted to find OEM H2 pistons, 16mm wasnt a major issue as would have used a rd400 rod

WIESCO 439 ?

[byron]

so a yamaha [?] 115mm rod on 58mm Indian webs giving 230cc would work ok ?
bearing in mind the inlet remark, thanks, good tip
I was initally thinking about a 60mm crank, but picked up a cheap GP crank [cheers mark], so am planning around that.

[davidblythe]

KAW250KX 78-86,KXT THRU 87 2756CD"

Quantity in Basket: none
Code: 439M07000

thought these ran the pegs in the boost port