Any Chinese chainsaw and chinese parts discussion

[Czed]

Terry syd i finally got in the shop here's the carb it's got little chinese markings on it lolView attachment 61249 View attachment 61250 View attachment 61251

Do you need a pic of the bottom.

 

[Czed]

Haven't ran the second one yet the first one has a bit over three gallons through it 40/1 red armor no issues other than the air filter fastener on the right side pops off from vibrating lol
I will heat it and bend it in that's it oils a 24 inch bar great switches choke chainbrake recoil no prob.

 

[Terry Syd]

That's the pump side of the carb, I wanted to take a look at the metering side to see how it was configured (jets, etc). No need to remove the metering lever, just lift off the metering diaphragm so we can see what's underneath.

 

[Czed]

That's the pump side of the carb, I wanted to take a look at the metering side to see how it was configured (jets, etc). No need to remove the metering lever, just lift off the metering diaphragm so we can see what's underneath.

Here you go man lol

 

[Stump Shot]

Around here It's been a long time since i ran a 272 or even seen one 372s are everywhere seems like.

There wouldn't be any 272's here either if I didn't keep building them. Have a cult following of firewood guys that just love 'em. I leave the 372's for the Pro's.

 

[Czed]

There wouldn't be any 272's here either if I didn't keep building them. Have a cult following of firewood guys that just love 'em. I leave the 372's for the Pro's.

I haven't worked on one in years 257 262 are pretty common just sold more of those models i reckon i could have bought a minty 262 for 150.00 but a friend of mine would have cried lol so i got it for him I've got my ported 257 anyway it's a good runner.

 

[Stump Shot]

I haven't worked on one in years 257 262 are pretty common just sold more of those models i reckon i could have bought a minty 262 for 150.00 but a friend of mine would have cried lol so i got it for him I've got my ported 257 anyway it's a good runner.

Actually more 266's than anything around here. Rarely get to see the smaller 2 Series saws.

 

[Terry Syd]

Well bugger, it ain't a Zama twin jet clone. I don't know what it is, but it may be a Walbro clone with the low speed circuit taking fuel from the high speed circuit. You may be able to confirm that and see if there is a blocked off circuit (on the side of the carb) that was drilled across from the hole that feeds the high speed needle towards the welch plug over the idle and transition circuit.

You can confirm the circuit by removing the low speed needle and squirting some WD-40 into the low speed needle hole and see where the WD-40 comes out. I expect some of it will come out that high speed access hole, which means the two circuits are joined.

The extra jet (with the hole in it) is likely an auxiliary jet for the high speed circuit (common on Walbros). Since that jet is not close to the welch plug and the low speed circuit, I doubt it is an auxiliary jet for the low speed circuit (I wish it was, it would make the mods easier). You will probably find a blocked off circuit (on the side of the carb) that runs from the jet to the main discharge nozzle.

Here's the quick and dirty way to get some more flow in the low speed circuit - put a heavier and longer metering spring on the metering lever. That will lean out the idle and force you to open up the low speed needle to get it to idle. Perhaps that will be all you need to get a bit more torque down low.

If that isn't enough low speed circuit flow, then the carb mods will get much more complicated.

 

[Czed]

I don't mind at all buying different carbs that you guys are familiar with modding here is the huztl ebay 11.00 jobbies look familiar if not and you have a link to a better one i would appreciate it thanks for all the info never messed with carbys much before just rebuilds.

 

[Terry Syd]

Take the easy route first, see if you can find a much stronger metering spring and try it.

The Zama twin jets are becoming hard to find on newer saws. Years ago, guys would chuck them and put on HD-12s. If they only knew how to mod the Zamas they would have been a lot happier. Maybe you can find someone with a bucket of the Zamas.

If that carb you've got is what I think it may be, then you will have to push out the main discharge nozzle, block off the circuit to the low speed circuit with some GB Weld, drill another access hole to feed the low speed needle, perhaps drill one of the transition holes a bit bigger, maybe block off the auxiliary high speed jet - in other words, it will become a lot of work and fiddling around.

Some of the Walbro clones do have an auxiliary jet for the low speed circuit. The HD-5 I use on my 64cc 029 uses one and I drilled that to increase the flow. There are other cheap clones out there that could be easier to work with, but you have to know what the circuits are like before you purchase them.

 

[Czed]

When i get time i will work on them thanks.

 

[Czed]

Actually more 266's than anything around here. Rarely get to see the smaller 2 Series saws.

I'm getting quotes for every freaking saw but a 272 it's crazy there is dozens of pics of 272s on the Chinese sites but only one supplier so far that ships to the us i haven't heard from them yet but the guy i bought my 365s from has the stihl 381s for 248.00 and 660 332.00 shipped to the us and i did negotiate a lower price for mine what i like about aliexpress they hold the funds and are not paid until you get a chance to test the saws.

 

[Czed]

I will find a source for a 272 i guess I've got to have one lol
Still can't find a 440 either 070 yes but not a 440 crazy.

 

[Czed]

My buddy might have me order a 381 i hope so i want to try it if i didn't have all my husky bars and part's i would have bought 2 of them.

 

[Mattyo]

What I want to know is how to get rid of the dual idle on these am carbs. You can set the idle a bit high....then it randomly goes low. I wouldn't know where to get longer metering springs either...perhaps out of larger carbs?

 

[Terry Syd]

Some of that weird idle may because of the EPA circuitry that connects the low speed circuit with the high speed circuit. When you split the two circuits the idle becomes more consistent AND (surprisingly) the high speed max RPM becomes more consistent. I don't know why the high speed max speed gets more consistent, I still can't figure out a theory for why it does.

The objective of a carburetor is to meter the fuel to the air flow. Take a look at sophisticated carbs and you can see all the different circuits. An electronic fuel injection system takes the metering to a whole different level.

Dialing in these simple diaphragm carbs to something that works fairly well isn't that hard, it just takes some time to dive into the guts of the carb. Most guys don't want to go that far. Even when I was racing bikes, although the parts and information was available, guys were reluctant to change various jets, needles, slides, etc. as it was TOO HARD. It seemed if it ran without seizing that was good enough.

 

[Stump Shot]

What I want to know is how to get rid of the dual idle on these am carbs. You can set the idle a bit high....then it randomly goes low. I wouldn't know where to get longer metering springs either...perhaps out of larger carbs?

Some that I dealt with already had too long/stiff springs. Replaced with ones ordered from Husqvarna.

 

[Mattyo]

How about a 5 pack of walbro HD springs...

http://www.ebay.com/itm/98-275-7-WA...282559?hash=item465e81e7ff:g:LVwAAOSwA4dWNPaj

?

 

[Czed]

Built the second 365 into a ported 372 using the hl supply topend didn't touch the transfers just woods ported it and base gasket delete runs good but just doesn't have the power of the huztl cylinder i ported for the first saw i had to swap out the metering spring for a walbro one runs perfect now it's a good cylinder i will try a 24 on it might have good torque with the 365 transfers walbro spring on the left and i cut most of the g off the circlips.

 

[Mattyo]

part # on walbro spring?