Hi Dave

My 140L (the one with the broken conrod, now fixed..) started to lose compression and subsequently power
two days before a competition last weekend. The exhaust valve was obviously leaking and grinding didn't help. Almost in despair [:@] I took the head off my new DZ and found it to be interchangable with the L if the injector fitting was blocked and the left rocker arm taken from the L.
This head does seem to have aluminum valve seats as opposed to the L head wich has copper (or something like it) inserts for the valve seats.

I am just curious, why this design change ? Are the alu seats hardened in any way ? Do they last
longer than the previous design ?

BTW the L ran super strong with the DZ head and the competition went quite well for me.

Oistein