Stihl 028 wood boss questions

[trevor615]

I got a used stihl 028 I just recently cleaned up. It’s got new fuel line, carb kit and impulse line. It starts but bogs down as soon as I hit the throttle. I’m not sure if it’s starving for fuel or if it’s getting extra air somewhere. Is there any recommendations on what I could try next to diagnose the problem?

 

[Wood Doctor]

First things first. Try opening up the Hi setscrew on the carb about a quarter turn. See if that helps. Fuel starving is not a bad guess.

 

[ammoaddict]

There are some good carb tuning videos on YouTube. I would start with that and see if it helps.

Sent from my moto g(7) power using Tapatalk

 

[Okie294life]

Like these guys are saying it should be set at 1.25 turns on the high and low speed jet, if it doesn’t run there or 1.5... wouldn’t go leaner...pull the carb, fuel filter and fuel lines and inspect the intake boot for cracks. More than likely it’s the little screen inside the carb that’s clogged with trash or a carb jet that needs cleared and rebuilt.

 

[trevor615]

I’ve rebuilt the carb and tried tuning it for hours. The intake boot as no cracks in it. Any other possibilities you guys can think of?

 

[Yukon Stihl]

Probably something you did when you rebuilt the carb,try another carb or take a look at it again.
Did you blow any pressurized air through the carb?

 

[HarleyT]

The ignition may be farking with you. Clean and adjust the points, or just pop on a good used coil from an 029/ms290, they can be found cheaply.

 

[Okie294life]

I’ve rebuilt the carb and tried tuning it for hours. The intake boot as no cracks in it. Any other possibilities you guys can think of?

Download a diagram of the carb and make sure everything is put back together correctly and you’ve used compressed air or carb cleaner to blow out all the passages.

 

[Okie294life]

Download a diagram of the carb and make sure everything is put back together correctly and you’ve used compressed air or carb cleaner to blow out all the passages.

Also check the choke flap on the air filter to make sure the springs still attached and not tweaked.

 

[trevor615]

So I put on a carb from my other 028 and the saw still bogs and stalls out exactly the same. The choke flap inside the filter isn’t stuck either. I’ve got no idea what it could be at this point. I haven’t replaced the fuel filter yet but I blew air through it and it’s not clogged

 

[HarleyT]

. I’ve got no idea what it could be at this point

points???

 

[VincentFR]

Check the ignition system :
-Clean contacts
-Check cable insulation
-Check air gap between flywheel magnet and coil => 0.2 -0.3 mm
-Test the condenser (only for old 028 AV and AVQ).

Look at the service manual for more information.

 

[Okie294life]

points???

Is the carb off your old saw a known runner? Is the exhaust clear of carbon?

 

[HarleyT]

Much easier and better to just pop on a good used coil, they are quite plentiful.

 

[HarleyT]

No need to pull the flywheel, etc........

 

[HarleyT]

Provided that it has points...