I've built 6 Huztl 660's and have one more waiting for a Huztl 56mm P&C to finish it off. I have also put together a Huztl 365/372 parts kit with a BB cylinder on it. I found the 660's much easier to work on and better quality than the 365/372. A couple of saws have a few tanks through them in wood and the others have just been broken in not in wood. I have other OEM Stihl (440, 044, 361, 362) and Husqvarna (365, 575) and the Huztl kits perform quite well against OEM. I have used all aftermarket parts on the saws. All of the saws except one 54mm 660 do not have a base gasket on the cylinder.
I really enjoy building these saws. I do touch up the ports just to remove casting boogers. The chain adjusters are not the greatest but they do work well enough if you are careful. I do grease them well and work them from one end to the other during the install. I find that the throttle linkage binds in the little rubber boot it travel through until a lube it. The high idle position on the ignition / choke level does not seem to do anything on my 660 kits. Some of my kits came with tapered bar studs and some came with non-tapered. The non-tapered have a very narrow step where the bar sits and I find it difficult to keep the bar in position when tightening the nuts.
All of my cases were assembled with heat on the cases and frozen cranks. I evolved to preheating the oven to 270F and then setting the case halves in for 20 minutes. Most of the cranks when it with very little force. I used the case bolts to pull the case halves together. I also left the crank seals in place when I assembled. I made sure to turn the crank as the halves went together. All the kits had the three M5 nuts missing for the bumper spikes. I also had two carbs that arrived with bent high adjuster screws. There has been a couple other missing pieces that Huztl replaced or sent me after I pointed them out. It does take a few weeks to get the replacement parts.
I am looking for other kits to assemble now. I have a Stihl OEM 361, 034, 362 and Husqvarna OEM 365, 575. I have done my share of rebuilds on toasted top ends and I always keep my eyes open for more.
Does anyone know other options for build kit saws?