HELP! Dolmar 5100s Husqvarna 2101

[Sloughfoot]

I’ve always had good luck with wolf creek!!! Love them and how descriptive they are.

Same here. I buy a fair amount from them. It's about the closest of the online AM saw parts outfits. Gets here pretty quick.

 

[Stump Shot]

I think @Stump Shot might have experience with the Duke’s 2100 cylinder

Yes, right from the inception. The Duke's cylinder is made by folks that make pistons and cylinders for a living, not a child staked to the middle of a mud hut or an old guy outdoors making them with his feet.
It has way better plating than the 1970's and 80's could offer. The level of detail is in step with modern OEMs. It runs better than the original. The piston kit that is also available separately is enterably usable as is and is also a quality made part. Lastly it does not have plating lapped into the ports to keep it on, up to the bevel is far as it goes, which leads me to believe that there is nothing holding it back from being ported. Note that I never have done so and can't comment with experience, that said I will make the attempt if the opportunity arises.
I have one on my saw and it runs well. I leave it stock as my saw is built with old worn-out loggers' junk and I don't want to knock the stuffing out of it, besides, it's fun as it is.
It used to be a Golf/LRB/Espirion made in India piston had to be used with a salvaged cylinder. I would use the old used wrist pin with new OEM circlips and a set of Caber rings to make it workable for the long haul. The supplied wrist pins being a hair on the small side, yielding a sloppy fit that over time/use will only get worse. The Duke's piston kit solved all these issues.
I can't comment on anyone's kit that came out after the Duke's as I have not tried them, as I only see these saws once in a blue moon. I am fairly confident however in recommending the Duke's for a replacement.