Ring locating pin.

[Doc]

maybe something like these could work

http://www.ebay.com.au/itm/Piston-Ring-44-5-x-1-5-mm-Chainsaw-Trimmer-Brushcutter-/170915008702?pt=LH_DefaultDomain_0&hash=item27cb5410be&_uhb=1

have purchased from this seller a few times wih no issue at all.

[OverTheHill]

make that 1975 for my RMS

[OverTheHill]

i put in LEM 65 on ebay & keeps coming up with KTM--? & shows a 'vertex' piston kit & rings available--not sure this helps or not. Item 331015113921

[evo550]

maybe something like these could work

http://www.ebay.com.au/itm/Piston-Ring-44-5-x-1-5-mm-Chainsaw-Trimmer-Brushcutter-/170915008702?pt=LH_DefaultDomain_0&hash=item27cb5410be&_uhb=1

have purchased from this seller a few times wih no issue at all.

Could be worth a go, although at 1.5 mm thick it may be a bit wide...wonder if they do a piston to match ?
Will have to do some searching...

[evo550]

i put in LEM 65 on ebay & keeps coming up with KTM--? & shows a 'vertex' piston kit & rings available--not sure this helps or not. Item 331015113921

Yeah, even google does that. The KTM 65 runs a bigger piston, so no go there.
Has anyone ever sleeved the pin holes in the piston to accept a smaller pin?

[Lozza]

There is no 'problem' swapping the rod  There are a few 44.5mm pistons out there. 

Maybe not for you Lozza, but to most of us it's a major undertaking. Not everyone has the expertise or equipment to do crank rebuilds in their suburban shed.

Google 'crankshaft rebuilding services' and $50 and a week or so later you have a rebuilt crank with 0.00mm run out on a single, twin($90), triple($120) or 4 cyl($160) press up crank. I don't bother rebuilding them myself now unless it's rush rush.

Evo I have the KX rod dimensions but not the LEM, I do have the KTM 65 rod dimensions

[OverTheHill]

can you use a little end baring with smaller diameter rollers & use the proper pin for your kx piston--or no room for that.!!

[evo550]

Development...Development.
Just found this, thanks to Docs lead
 http://www.meteorpiston.com/Lists/Cross/Catalog.aspx?SortField=Diam%5Fx0020%5F%5Fx00d8%5F&SortDir=Asc&View=%7B356748F3%2DCB52%2D40CF%2DB7ED%2D5D22B1EA0369%7D&FilterField1=Diam%5Fx0020%5F%5Fx00d8%5F&FilterValue1=44%2E5000000000000

Can anyone confirm that "compression" measurement (23.6mm)is from the top of gudgeon pin hole to the top of dome and the "head" measurement (1.9) mm is from top of piston (outside edge above ring groove) to top of dome?
It would appear that the kx 65 piston is closer than I thought.

[Lozza]

Euro comp height is from centre of pin bore so - 6mm from that is from top of pin bore. Dome height is from timing edge to top of dome.

[SON]

Took 20 seconds to find Wiseco Piston Kit 696PS which uses 1693CD Rings
Should be available from your local bike shop from SERCO or A1 Accessories

[Lozza]

That's a 43mm piston isn't Evo after a 44.5mm piston?

[evo550]

That's a 43mm piston isn't Evo after a 44.5mm piston?

Yep...

Euro comp height is from centre of pin bore so - 6mm from that is from top of pin bore. Dome height is from timing edge to top of dome.

Is it possible that they are measuring from the top of pin, as 6mm lower would make it very close to the cut out below the pin and a very "top heavy" looking piston.
The LEM piston measurer 23.6 mm from top of gudgeon to crown...

[Lozza]

That's a 43mm piston isn't Evo after a 44.5mm piston?

Yep...

Euro comp height is from centre of pin bore so - 6mm from that is from top of pin bore. Dome height is from timing edge to top of dome.

Is it possible that they are measuring from the top of pin, as 6mm lower would make it very close to the cut out below the pin and a very "top heavy" looking piston.
The LEM piston measurer 23.6 mm from top of gudgeon to crown...

What's a top heavy piston?  Did you remember what said about conrod length 

[evo550]

That's a 43mm piston isn't Evo after a 44.5mm piston?

Yep...

Euro comp height is from centre of pin bore so - 6mm from that is from top of pin bore. Dome height is from timing edge to top of dome.

Is it possible that they are measuring from the top of pin, as 6mm lower would make it very close to the cut out below the pin and a very "top heavy" looking piston.
The LEM piston measurer 23.6 mm from top of gudgeon to crown...

What's a top heavy piston?  Did you remember what said about conrod length 

What are the chances the KX rod would be 6mm shorter...

[Lozza]

KX rod/piston