Question about 250/300 cylinders

[Bobt250]

I'm looking to buy a new 300 Gasser. I have been told that in the case of the 300 KTM the cylinder is the same as the 250 just that the inside diameter is larger to accept the larger piston. This makes the water jackets smaller thus causing overheating problems. I was told this but cannot verify.

Does anyone know if the Gasser 300 cylinder is different or simply a bored out 250?

[gasser]

The 250 and 300 cylinders on gassers are interchangable. I've changed a 2001 GG300 to a 250 and a 2007 GG250 to a 300. No over heating or any other issues with either bike.

[Bobt250]

Thank you for your reply. Do you know if the water jackets are bigger on the 300 cylinder?

[Gasgasogeros]

the gasgas dont have water gasket in heed only 2 oring

[GMP]

The GGs were never hot running bikes like the KTMs. Any displacement can grunt around in the trials stuff without issue, lots of cooling capacity. The cyls are basically the same casting and even the PV parts interchange.

[gasgasman]

The 250 is more like a sleeved down 300.

[Wilksiee]

if you was to change the 250 cylinder to a 300 cylinder, would you need the 300 powervalve aswell?

or can you use 250 parts on the 300 cylinder

[stainlesscycle]

pv is same on 200/250/300

[Wilksiee]

ahh thats good to know, thank you