I have a homelite ST-175G string trimmer. How far out do you turn the two carb adjustment screws so it will start?

Hi and welcome to FixYa, I am Kelly

Turn it until just closed (fully in) then back it off 1.5 turns. Yuo will have to dial it in again...

For one screw type carbs... turn the H screw until it runs MAX speed and will idle.
For 2 screw carbs H & L screws adjust the L screw first until it idles and does NOT stall or hesitate when you MAX the throttle. Then adjust the H screw until you get MAX speed. Re-check for hesitation or stalls. Re-adjust L screw if necessar and dito for the H screw after re-adjusting L screw.

NOTE make minor adjustments each time.. not much more than the width of a screwdriver blade. Your final adjustments should not be more than 1/4 turn from where your started.

Set idle speed screw stop last on the top of the carb to get a decent idle.
This should get you going.
Thanks for choosing FixYa,
Kelly

I couldn't find a parts breakdown for your exact model, but on the ST-185, the clutch is optional. If you can remove the handle from the front engine cover (probably 4 Torx screws) and look inside, there would be a round 4" or so metal drum with the clutch inside right near the front of the cover. It is not hard to spot. Post back if needed.

best way to go is 40:1

do you have adjuster screw's on the carb???

if you do then screw them all the way in then back them out about 1 and half turn then slowly adjust until correct setting's are reached

If its built into the carb, 2 screws and a cover plate hold it in place. If it is externally mounted, if you look at it closely, you will see it may be snapped into place in the cover its in. Small engine shops and Ebay have the replacements.

clean and repair carb, make sure the mounting gasket is ok. and does not have a vacuum leak.

I always understood that the rule of thumb is to back out 2 1/2 turns. That is the starting point for any other adjustments, but if it still won't start, then the carb adjustment is not the problem. Check spark and fuel delivery.

This is for a duel line trimmer. I hope this will help.

Cut two separate pieces of string, about 7 ft. each.

Stick the end of the line in the hole on the inside of spool.

Wind clockwise onto spool, putting the line that is closest to the ground on first.

Once you have winded this piece on, lock the last 4 inches of line through the slits on spool.

Repeat process for second piece of line, locking the last 4 inches in slot opposite the other locked in piece.

Put the spool on the trimmer, feeding the end of lines through either hole on trimmer.

Before you push the spool all the way on, pull the strings out of the locked position. Put cap on and GO CRAZY!

Jim

Here is a link to that weed cutter...
http://www.odref.com/homelite/string-trimmers/ut-15039a.PDF
you need to unscrew part#37 .. it may be on very tight... hope this helps
Tobaz

undo the 2 screws on top of the carb. The bulb is part of a 2 piece cap undo that and it fall out.