Author Topic: carb setting  (Read 146 times)

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Offline jmw642

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carb setting
« on: June 14, 2015, 08:54:21 am »
Have an old stihl 028 and some how the setting on the carb needle valve got bent. Anyone know how or where it should be set to ?

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Offline Cut4fun .

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Re: carb setting
« Reply #1 on: June 14, 2015, 09:21:31 am »
I start at 1.5 turns out from lightly seated. Fine tune from there.
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Offline Cut4fun .

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Re: carb setting
« Reply #2 on: June 14, 2015, 09:25:57 am »
In depth carb settings by a member.

Quote from: joe_indi 
stihl wood boss 028 av carb settings
First thing to do is make sure the air filter, pickup body and spark plug are clean.
The next thing is to fill up the tank with fresh fuel.
Screw in both the L and H screws and  back off ,.............now here's what I do whenever I think that there could be a risk of too lean a setting to start with, I turn the screws out 1 1/2 turns.
Have the chain and bar fitted on the saw when you set the carb.
Start up the saw and warm it up for a minute.
Turn in the idle screw (LA) till the engine idles with your hands off the throttle.
Now turn in the L screw slowly. The idle speed will increase then drop with the engine running a bit rough.Back off the L screw from this point till the speed drops.From this point turn the L screw in 2 minutes.(like you would move the minute hand on a clock 2 minutes forward).

Turn out the Idle screw if the idle speed is too high.

Okay, now have the screwdriver in the H screw. Go to full throttle. The engine should  four stroke heavily.Turn in the H screw till the engine stops four stroking.The rpm will also increase when you turn the H screw in.
Let the engine go back to idle.
Now go back to full throttle.
Back off the H screw till the engine just starts to four stroke.
Let the engine go back to idle
Your high speed is set now.
You need to confirm now if the L screw setting is correct.
Do the next three actions without any pause in between.
Go to full throttle, move the brake handle forward and let go of the throttle.
The engine should not die down or run too slow and then pickup idle speed.
In that case, open the L screw a bit till the idle speed drops, increase the idle by turning in the  LA screw.
Try the bit with the throttle and brake once more.
Once the idle speed just misses a beat and then settles to its regular speed, the idle setting is okay.

If the H and L screws have to be turned out 2 turns or so, check the  engine carefully for air leaks or a weak pump diaphragm  before you go any further.
Likewise, if the L and H screws have to be turned in nearly to their stops, check the carb for a leaking metering needle.

Joe
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Offline jmw642

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Re: carb setting
« Reply #3 on: June 14, 2015, 11:45:32 am »
inside of the carb there is a needle valve that lets fuel into the carb. What I need to know is where to set the lever that opens the needle valve.

Offline Cut4fun .

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Re: carb setting
« Reply #4 on: June 14, 2015, 12:14:28 pm »
Fulcrum setting.  What carb?   Height to top of fulcrum. Some are straight across carb base. Some are straight across from inside carb area. 

Give carb info.  Like a walbro wt etc   Yours might be a Tilley  Tillotson too
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Offline jmw642

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Re: carb setting
« Reply #5 on: June 14, 2015, 01:33:36 pm »
yes it is a tillotson carb

Offline jmester

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Re: carb setting
« Reply #6 on: June 14, 2015, 07:22:48 pm »
http://www.tillotson.ie/techinfo-service.php
Follow the link and you can download the service manual for your HU-40 carb
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Offline jmester

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Re: carb setting
« Reply #7 on: June 14, 2015, 08:02:02 pm »
It says the inlet control lever should be flush with the chamber floor.
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Offline jmw642

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Re: carb setting
« Reply #8 on: June 14, 2015, 09:13:44 pm »
Thanks thats just what I needed thank again

Offline jmester

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Re: carb setting
« Reply #9 on: June 14, 2015, 09:27:34 pm »
Glad we could help. Let us know how you make out.
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