Any Chinese chainsaw and chinese parts discussion

[Leafy]

So with the goofy cylinder untouched and the stock piston it has about 40 thou of squish with no base gasket and 105deg exhaust timing. I'd need to file the bottom of the cylinder flat to make it seal without a gasket though.

 

[Czed]

So with the goofy cylinder untouched and the stock piston it has about 40 thou of squish with no base gasket and 105deg exhaust timing. I'd need to file the bottom of the cylinder flat to make it seal without a gasket though.

You got the worst one I've heard about
Casting flash and port edges I've had to clean nothing major
Huztls going downhill though
Facebook has a huztl build page
Lot's of complaints usually 660 bearings
Not much about the 372s

 

[Leafy]

Wow. I had to take so much off the squish to get it flat the 272 piston clears the head with the base gasket in. Lol wait its got 24 thou of clearance. Hahaha this jug.

 

[Czed]

Wow. I had to take so much off the squish to get it flat the 272 piston clears the head with the base gasket in. Lol wait its got 24 thou of clearance. Hahaha this jug.

Post some pics when you get a chance
Did you get the little oring for the clutch side.

 

[p61 western]

Post some pics when you get a chance
Did you get the little oring for the clutch side.

Mine wasn't in the kit. By the sounds of it I don't want to buy another kit lol. I must have got lucky with mine.

 

[Leafy]

It didn't come with one. I have a Buna-n oring kit I took one from that should work. Timing with the jug like this is.
E 98
T 125
I 84 (closing atdc/opening abdc)

I think I'll run the saw like this after cleaning up and widening the ports. Or should I right off the bat jb weld the bottom of the intake to get it to 80deg and move the transfers to 120 to get good blow down?

To compare, timing with the stock piston and no gasket was
E 105
T 131
I 114

Also measured the cc chamber, 6ml... Ummmmmmm this is going to have stupid compression. So that's 7.3ml including the squish which is like 8:1 by my calculator that has a note that 6.5:1 is max recommended. Guess I need that early exhaust to keep dynamic compression from making it knock.

 

[Czed]

@huskihl
What numbers you like on these

 

[Leafy]

Got the pictures.

Heres how I cut the squish, 120 grit super glued to the top of the piston I wasnt going to use. Have to blow it out constantly so you dont grind the dust into the cylinder walls.

Here it is before I started cleaning up the ports and with the squish cut.

And ports cleaned up and widened. 1/4" rougher caught and zinged around the intake and pulled it out of the vise, its textured for turbulent flow now and a little lighter, lol.

 

[huskihl]

@huskihl
What numbers you like on these

102 122 78

 

[Terry Syd]

Czed, maybe you can confirm it, but it looks like Leafy got one of those big bore jugs that has the 365 porting. In other words, the transfer port next to the exhaust port isn't as wide as the 372 jugs.

 

[Czed]

102 122 78

Tanks

 

[Leafy]

Czed, maybe you can confirm it, but it looks like Leafy got one of those big bore jugs that has the 365 porting. In other words, the transfer port next to the exhaust port isn't as wide as the 372 jugs.

I'd like to know too. I ran the numbers both Blair and Jennings method and if I move the transfers to have 18-20 deg of blow down they're too big for a 77cc saw looking to have peak power at 10k rpm.

 

[Czed]

Czed, maybe you can confirm it, but it looks like Leafy got one of those big bore jugs that has the 365 porting. In other words, the transfer port next to the exhaust port isn't as wide as the 372 jugs.

This is a 50mm hl supply on the bottom
All my huztl 50mm and 52mm are shiny like the one on the top.
I've had a couple dozen now

 

[smokey7]

Looks like one maker mschines some steps where others rely on the casting/mold to be good enough. The top one definatly has more machibing steps to the base and intake neck. I doubt the intake machining is required but sure looks nice. Im not sure if oem even machines them

 

[Czed]

Got the pictures.

Heres how I cut the squish, 120 grit super glued to the top of the piston I wasnt going to use. Have to blow it out constantly so you dont grind the dust into the cylinder walls.

Here it is before I started cleaning up the ports and with the squish cut.

And ports cleaned up and widened. 1/4" rougher caught and zinged around the intake and pulled it out of the vise, its textured for turbulent flow now and a little lighter, lol.

Any progress?
I keep breaking eclips so i buy bulk
And the washers get lost.

 

[Leafy]

Working on the brake now

 

[Czed]

@Poleman
Rich is yours still together

 

[Leafy]

Done. Stuff on the right is left overs, Stuff on the left is spares or stuff I left out on purpose.

I got it to pop and run a few turns on brake clean. I'll gas and oil it tomorrow and get it going. Holy he'll does it have some mean compression, even with the compression release you still need to pull it with conviction.

 

[Poleman]

Yep still together and running well!!! Going to update to a ported B.B. top end soon and run some more!!!
I want to try some different intake ideas that have been rattling around in my nogin....

 

[Czed]

Done. Stuff on the right is left overs, Stuff on the left is spares or stuff I left out on purpose.

I got it to pop and run a few turns on brake clean. I'll gas and oil it tomorrow and get it going. Holy he'll does it have some mean compression, even with the compression release you still need to pull it with conviction.

Not a fan of brake clean to start a saw lol
Tell us how it runs.