What's on your bench now?

I need to take my heat gun out in the woods next time. I'm curious what the exhaust temps are. I'm thinking a leaner tune would result in higher exhaust temps. Am I correct in that assumption?

 

That's why I say *according to Google*
900 sounded a bit high

I’ve got a deflector concept in the works but it might interfere with the bar or plastic on the saw. Have to mock it up tomorrow before committing to welding anything.

 

Yes. I use a heat gun when doing my oil testing. Just a smidge of adjustment can effect the cyclinder temp 20° under the loads my test units are under.

 

Im not doubting the gas coming out the cylinder is 900 but I've never seen a saw muffler even near that hot with my temp gun.

That's a nice looking deflector. Do you have thinner stock to make it from?

 

This is going WAYYY back but there's some cool concepts for inspiration here:
Muffler Mod Pic Thread

 

No, I don't have much extruded structural type steel at my disposal but I can mill it thinner to be more like the stamped sheet metal on the muffler. I imagine leaving it thick like that will retain a lot of heat.

 

More betterer? If it doesn’t work well I’m making a custom one anyway

 

Nice. That should breathe easier.

 

Got a g288 in
I tore it down and checked everything no issues
I greased the clutch bearing and swapped out the entirety too short pull rope.
Starts,runs,oils great
Solid saw every bit as strong as my oem 288s i have a few.

 

Yesterday my-new used OEM cylinder came in, and today my piston and rings arrived. It’s kind of hard to tell because somehow I was able to mimic the roughness of the original casting pretty closely using my oval shaped carbide burr, but I actually did widen the lower transfers quite a bit. Probably could’ve gone more but didn’t want to risk it, being my first time trying this. Unfortunately I don’t have a small angled rotary tool to get in there and widen the intake and exhaust ports where they meet the cylinder, so they’ll stay as they are. I’d rather not attempt it with the wrong tool and have my burr skip across the cylinder wall It’ll do for now. Between this and the muffler mod I’m hoping to get some modest gains over stock.

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Not sure how fat the grinder is you are working with but I grind from the outside in on the exhaust and intake port. With the right shaped diamond bit I can debur that way too.

 

I might be able to get away with that… but I’m not feeling especially brave today Kind of just want to see this thing up and running later this week.

 

That should reach but I get the baby steps. You can't put the metal back in.

 

I’m waiting on my wrist pin bearing to come in before I can start putting the 028 back together. In the meantime I needed a side cover for the saw so I reverse engineered the one off my 029 super. This is milled from 7075 aluminum so it’ll be pretty indestructible.

 

WOW. That looks outstanding. You are one heck of a machinest bud.

 

Thanks but don’t look too closely. I missed a retract, shattering a carbide end mill and one internal corner is pretty boogered up but I’m leaving it because it won’t effect the function. Still have to make the plastic insert the chain rides along.

 

Did the test fit on my (dirty) extra sausage 029 super just now. Fits like a glove This is going to look sweet on the 028 when I get that back together.

 

Holy crap!!!!!!!!!!!

That is beautiful.

 

Thanks Craig The worst part was just getting it all modeled out in the CAM software. To get the dimensions I set it up in the Bridgeport and zeroed out on one of the bar stud holes. Then I put a 1/4” dowel pin in the spindle and went around “probing” a bunch of edges and recording the positions. At least now if I want to make another one, I have the solid model.

 

I can relate as to what is involved. No doubt this was not your first rodeo.

You should be making aftermarket parts and selling them. A part like that will sell itself.
Heck I would buy one just to hang on the wall.
Even a Husky guy would buy one.