Partner K750 [P]review
This isn't quite a review, because we haven't run the 750 yet. However, there are enough changes in the K750 that they are worthy talking about, even before we have the chance to test one. Hence the [p]review title. I was at my favorite construction supply store today to pick up some parts for our Partner K950 concrete saw and to rent a hammer drill to punch a hole in a storm drain. While I was there I saw the new Partner K750 brick saw. I noticed a few things of interest while I was there that I'd like to share with you.
The first thing you notice is the form factor of this brick saw - it's new, aerodynamic curves made it a better looking saw, though I guess the aerodynamics only matter if the saw falls out of your truck while on the highway. Even so, it looks great. Wrapping the body around the shape of the blade guard may have even give the Partner a little more room for filtration or sound dampening.
Switches - the choke switch/lever appears the same as previous models, pull out to choke the engine a little, in to release it. They've changed the on/off switch to one that rotates out to turn it off. That makes it more obvious which position it's in, but for some reason I'm thinking the durability of that switch is now compromised a bit.
One of the touted features of the K750 is the new, automatic decompression valve. No need to press the little blue button anymore. Or is there? I noticed a K750 in a disassembled state waiting to be serviced by the technicians there, and noticed it had the "new" auto-decompression valve, but the brand new saws on the shelf had the old blue button. When I asked the counter guy about it he told me they had gone back to the old compression release valve because they were having problems with the automatic valve. I'm no saw designer, but I was wondering myself about having a rubber hose riding right next to the cooling fins of the cylinder block. Seems to me it wouldn't take long before that hose was melted through or vibration wore it through. Maybe the problem had nothing to do with that hose, but whatever the problem, these techs are retrofitting every K750 with the older decompression valve when they come in, whether they need it or not.
Exhaust is now ported through the bottom of the muffler, not the top. The same is true for the K700 as well. The muffler does appear bigger, so I'm hopeful that the sound is reduced. Not that this saw is particularly loud; every saw from every brand is. The more that's done to allow me to hear my kids talking to me when I'm 50 gets two thumbs up in my book.
Visible fuel gauge - I like this feature a lot. It runs vertically alongside the handle of the brick saw. I'm anxious to see if the fuel level is still visible after the clear plastic viewer has been scratched by flopping around in a truck for a year.
T-wrench holder - there's a little slot that's been made a part of the water kit, at the switch/valve. However, it's nothing more than a little holster that will spill the wrench out as soon as the saw is held perpendicular to the ground. Plus, it puts the wrench in the way of the decompression valve. It's nice that they added this feature, but it'll need to have some sort of durable (probably metal) latching mechanism before it'll be useful.
Tighter fit of air filtration system cover to the rest of the system. They must have listened to me! Instead of one or two bolts holding the air filtration system together, there are three. Even better, drawing a line between the three bolt heads forms a triangle (you engineering types will appreciate the strength of the triangle). I expect of all the innovations on this saw, this one will provide the greatest extension of brick saw life, keeping more contaminated air from reaching the combustion chamber.
We have a couple saws that are probably in need of a new home, and I'm interested in replacing them with K750's to see how they perform.
Partner K 750 Specs:
Power: 5.0 hp
Weight: 21.4 (14" version)
Power-to-Weight Ratio: 0.38
Maximum Speed: 5,400 rpm - spindle
Arbor Size: 1 inch (25.4mm)