I got my new Redmax HBZ2601 and project blower HBZ2500. They've already both been modded, lol. Nice blowers BTW. If you want a well built product, buy Redmax. I've seen the quality again in these blowers. The 2500 is just a previous version of the 2601. Even these little 25cc blower engines have vertically split mag cases, cast beam shaped rod, removable caged needle bearing in the rod, two rings. You name it, it's done right.
The 2500 was nearly completely disassembled. The P&C were heavily carboned but in excellent shape. I cleaned everything up and actually did a little port work on the cylinder. Yes, I know. That takes me over the deep edge when I start messing with 25cc blowers
This is a strato engine and has a tiny TINY intake port and carb feeds to both transfers. I slightly widened the intake, tapered both transfers towards the rear and slightly widened and raised the exhaust. I put it back together without a base gasket, netting a squish of .018". There was so much carbon that it was hitting at TDC without a gasket when I started! I broke one of the two rings removing it from the heavily carboned piston groove. Well Husky often only uses one ring. Saw builders sometimes remove the bottom ring. Let's see how it runs with just one. I want to see this thing run! Wait a minute. I don't have a carb for the 2500. No problem, Like I said, the 2601 is basically the same blower. So the new blower got robbed of it's carb and throttle cable. IT STARTED ON THE 2ND PULL AND RUNS GREAT! No kidding. It idles perfectly at 2700 RPMs and revs out 800-900 RPMs higher then the new one did out of the box. The very lean edge is 7660 and I turned it down to 7500. I'm happy. The question is, do I go back in there with a new set of rings or leave it like it is. I'm not sure it would run any better at all.
Like I said, the new one's been modded too. One of the few changes they have made to these is to add an aluminum restrictor plate between the cylinder and the muffler. I block probably >50% of the exhaust flange. Instead of just removing it, I opened it up and left it as a heat deflector. It could be just removed though since it's not one previous models. Out of the box it was turning about 6700 RPMs. It's now set a little rich at 7300. so I'm not sure the little port work I did to the 2500 make much difference. Maybe it's the one ring hurting it after all. Reguardless, this new 2601 runs like a charm, has perfect throttle response from idle to WOT and revs out nicely. This is all the blower I need and is better built than most other blowers on the market. REDMAX DOES IT AGAIN!!!