Stihl 036/044 Hybrid Build

[Chainsaw Jim]

If I get a chance I’ll try to start it later

Later huh? I'll kick that happy little banana right in the stem.

 

[J_M____]

So threw some gas in her and she fired.
It’s got a Chinese carb on it and it would start on choke and rev up fine but couldn’t get it to idle. Engine was vacuum/pressure tested and was fine. I don’t think the idle adjust screw is opening the throttle plate enough to hold the idle. I did notice the notch in the throttle plate is much smaller than an OEM carb.
@Poleman
@Terry Syd
Should I try making the notch larger? The idle adjust screw is all the way in and isn’t enough. Either that or it’s a junk Chinese carb. Any thoughts?

 

[RI Chevy]

What carb? Zama?

 

[Chainsaw Jim]

It can be a little tough to find the right spot with the low side when firing up these type of builds for the first time. Sometimes it takes a little bit for the air trapped in the carb to escape.

 

[J_M____]

What carb? Zama?

No a 044 China Walbro HD clone

 

[RI Chevy]

Ahhh. Ok. [emoji106]

 

[Poleman]

If it won' idle and the idle screw is all the way rich but can get it to run by openng the throttle I would say your correct on the throttle plate hole. It' an indicator the saw needs more air to run.
I would drill a hole in the plate as its very easy to repair if yu ou go too far and need to make it smaller again if you findo a sweet spot.
I'm also with Jim on giving it some time and adjustments on a first start on a build like this. You just have to try to figure out what it' asking for to get it to run and diagnose if it' rich or lean by checking for a wet plug and a lot of smoke or a dry plug and not wanting to start unless primed.

 

[J_M____]

It starts right up on choke and runs on fast idle/choke. Will rev and run great but let off the throttle and it’s acting like it’s not getting enough air and idle is too low.

I’m going to pull it off and open the notch up larger( to the same size as an oem carb to start with) and see how it goes from there. I did notice that it seemed strange that the throttle plate has such a small hole when I put it on. Maybe that’s all they had at the time when assembling in China. Hopefully that works, if not I’ll put on a known good carb off my 044.

 

[huskihl]

Have you tried turning the L screw in?

 

[RI Chevy]

You could check the plug. Is it soaked with mix or dry?

 

[David Young]

Is the impulse adequately open in the case

 

[J_M____]

Hmmm, yeah this won’t work

Low speed Needle from spare carb on top, low speed needle from current carb on bottom.
Not sure if it’s broken off inside or was just like that - great china quality.
There is also fuel on the back side of the diaphragm, I think it has a pin hole.
This was a new carb!

Going to swap on the spare carb I got

 

[hseII]

@ Doc McStuffins.

@drf256

 

[hseII]

Awesome work.

Thanks for the Trailblazing.

There you are.

 

[hseII]

Good news. That means an 046 Jug should fit even better. Not sure that the base would trim up though.

You’re Welcome.

 

[J_M____]

Anyone happen to have a good OEM 044/046 carb they would part with?

 

[hseII]

Anyone happen to have a good OEM HD-16 carb they would part with?

 

[Wonkydonkey]

The carb needle screws are like that, they differ from different manufacturers. I’ve had the same prob, and even when they look the same, the thread was different.

 

[drf256]

Anyone happen to have a good OEM 044/046 carb they would part with?

I should have one for ya. “Good” is the issue.

I’ll try to look through my pile tonight or tomorrow. I can bring to the gtg, or try to get it in the mail this week.

 

[mikerudder]

Anyone happen to have a good OEM 044/046 carb they would part with?

Have a specific one in mind? I possibly might be able to dig one up.