In simple: 2 stroke 185MP 510CFM vs 4 stroke 184MPH 516CFM backpacks. Is there a difference? ------------------------ Using a Ryobi backpack (185 MPH/ 510CFM) for a while and it works good enough and no mechanical problems. I don't have mountains of leaves to move across the yard and I'd probably tarp drag instead of blow if I had to. It moves wet leaves and decent piles of leaves quite well and I never felt I needed anything much much stronger. I mulch leaves anyway. Been wanting a 4 stroke backpack though because they're cleaner and less high pitched. Only 4 cycle backpacks are Craftsman/Troybilt which are basically garbage (something deep inside plastic keeps breaking and PITA to repair) but even if they've since revised that, they're only about 150MPH 500CFM. Dolmar 4 stroke backpack is a good brand, but I'd rather get a Makita since Dolmar is harder to find or parts. I think they merged into just Makita anyway. Makita has a new mini EB5300TH for $330 which is basically the same CFM and MPH as the Ryobi. EB5300TH: 184MPH + 516CFM RYOBI: 185MPH + 510CFM Ryobi: 18lb dry EB5300TH: 19.7lb and probably a larger gas tank which is worth the added weight wet. Ryobi straps are thin and the Makita's padded and probably much more comfortable even with more weight. Ryobi = 73.4 dB EB5300TH = 70dB and might be less annoying of a sound being a 4 stroke despite similar decibel levels. Maybe Makita takes those specs with the tube reduction nozzle? I guess I'll have to ask Makita. I'm not really a fan of reduction nozzles. Feels like it focuses on one narrow spot. Anyone have a EB5300TH and does it work good enough for just cleaning grass clippings off walkways etc? 4 stroke usually means more torque but less RPM zip of a 2 stroke but not sure how this would compare with two blowers having the same MPH and CFM specs. (or if the reduction nozzle was used to cheat Makita's specs). I had a 251MPH 434CFM Husqvarna 150BT a couple years ago, and felt the Ryobi 185 MPH 510CFM was more effective, had more zip and less ramp up or something and sold the 150BT. Or should I just skip the EB5300TH and get Makita's $490 EB7660TH. EB7660TH = 206MPH 706MPH, 24.1lb dry, 76dB. I just figure if the mini Makita is good enough then might as well get the smaller lighter version, but I did return a 25cc 4 stroke Honda trimmer for the 35cc version and very glad I have that extra 10cc power if I need it but trimming is different I use that Honda on vines and saplings etc whereas the Ryobi backpack specs have always been enough power, Even the larger EB7660TH Makita backpack doesn't have specs like the most powerful redmaxes and stihls so if I ever find that I want more power I'd probably get the mini Makita for regular use and a top of the line redmax or something for just leaves and not even bother with the EB7660TH.