Suprised i didnt catch the piston bore comment for cars. My father worked for GM dealerships as a mechanic since 1970. As a kid I remember him telling me, during assembly the computers would match up the best combinations of rods to journals and pistons to cylinders for optimal performance. Some also different sizes for heat expansion also. 😊
From what I've been told buy saw builders is with free porting there is the potential to draw unburnt gas and possibly carbon bits from the muffler directly into the crankcase where the bearings are.
Very respectable gains👍🏻 still don't regret purchasing my wemars 6220! Just proves the differences in tolerances and machining, on mine, dropping the cylinder until I could juuust barely see a trace of light at bottom of exhaust got it to .028 squish. Good to see a little free porting doesn't drastically effect these!
This is the second time I have free ported a cylinder. The other time...Mufasa. And that saw is the worlds fastest Wild Thing. Still runs insanely good too. Fired up the other day on the second pull and idled like an old Chrysler slant six, ready to put in another days work.
No time like the present to get started and experiment with porting. It's a lot of fun to improve saws, especially saws like the Poulan Wild Thing or the equivalent saws that people think are no good and you make them rippers 😁
Had a few saws free port and none have had issues. Definitely isn't ideal but a little isn't the end of the world. Most I've seen closes the Freeport before you lose any case charge.
I just did my supmix"6200", with gasket delete my exhaust was at 101.5, it had 176 intake duration, ended up using jb weld on it, raised primary transfer to 19 bd, night and day difference
I've seen some of your videos on it but haven't watched yet. I'll have to check them out. I've been watching your Poulan stuff. Truthfully...did you ever get that 330 completely lined out? I mean, I watched all the videos, but off camera...is it still leaking? I JUST recently learned about crank bearings in these things getting a little bit lose and they will run fine until you cut with them or tighten the chain. Then you get a little pressure on the PTO crank bearing and it develops an air leak at the crank seal. My Binford Bad Boy is doing exactly this. Gotta get in there and replace the crank bearings. Sucks, but is what it is. Just wanted to share that bit of knowledge. I know from now on, I'll be looking at the bearings, not just the seals.
@@novicelumberjack no its tight now, after the last video I had it out cutting and zero issues, I'm not 100% but I think the leak might have been between carb and boot
I've posted this on a couple of your videos of these chinese saws. Put a 372 carb and aftermarket intake(they're on ebay for 5200 saws) on it and it will gain about 2000rpm. It makes more difference than porting does. After you do that mod, it takes a really strong pro level 50cc saw to keep up. My friends have 550xp's, they're nicer than my cheapy chinese saw but a little slower.
Why isn't it as good? It would be interesting to hear what you found.... What I've seen with the Chinese engines is the lack of material making the engine stronger...
10k is far too much. Maybe 2k or something. Inky time I think about that is when I go below 20k. Then I'm like, "that's okay, the moto seal will help out".
