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Issue wont run on full throttle, bogs out

Chainsaw stihl 084 33'' blade

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  • nicolihawk May 09, 2009

    stihl chain saw will not run on full throttle

  • Mark Tripp
    Mark Tripp May 11, 2010

    have you tried to adjust the hi and low setings on the carb?

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  • 47 Answers

Check the spark arrestor in the muffler for a clog

Posted on Feb 08, 2009

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Why is compression low and blades will not engage?


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If the unit is fairly new, that shouldn't be a problem. If what you mean 8s that when u engage the throttle and it's not getting more power, check your carburetor setting. Look for the "H" . When you adjust this needle , hold the throttle in as you do it.

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Is the 'cutting head' in a work position and not folded back.? Does the drive shaft spin.? Is the attachment on the shaft properly.?

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Km90 starts but won't run on full revs


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May 21, 2012 | Oregon Scientific Complete Carburetor for...

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How do you set the carb screws on a stihl d12 avt chainsaw? how many turns for high an low?//?????


I would start by opening each 1 turn. Then 1/2 turn until I got it running. While running, set the low by turning the screw out until the saw starts to slow down. Then turn in until the same thing happens. Set the screw about 1/2 way in between. Do the same with the high but do it while running at a higher RPM. Do not run it wide open unless you have the chain in wood, cutting. Good luck...Lee

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1 Answer

I need a manual for a homelite gas hedge trimmer HT-19 I need the factory settings for the carb. bottom out screw turn out 1 1/4 turn? Have to hold throttle wide open to run.


Hello cosorio70:

You can Get a Manual from the Following Site Addy;
https://register.homelite.com/contact_us/new and Fill Out the Required Information. Remember to have the UT Number if this Unit has One.
>>The Following is the Instruction File for Setting the Air Mixture Screws. Any Input is Appreciated. The Procedure is the Same for 1 or 2 Mixture Screws, Just Use the Instruction File and Skip Over the Section with the Missing Mixture Screw ( Usually the H Mixture Screw).
>>Now Setting the Air Mixture Screws:
>>****Turn the Idle Air (L) and Main Air (H) Mixture Screws In Until SNUG **Do Not Jam** Then Reverse Both Screws 1 1/2 Turns. Set the Throttle Full Open, Start the Engine.
>>Turn the Main Air (H) Mixture Screw Clockwise Until Proper Revs are Obtained. **Carefully Use your Finger and Move the Governor Arm to Rev the Engine (on Chainsaws and Trimmers Use the Trigger to Rev the Engine) Until you Reach Max RPMs (on Chainsaws and Trimmers, the RPMs are Not Set to MAX. Set to Max and then Reverse the Setting Screw 1/4 or 1/2 Turn. If the H Mixture Screw is Set too High; the Engine will be Starved for the Oil in the Gas and Damage the Piston and Jug/Cylinder) and the Engine is Running Proper at Full Throttle Up a Grade and for Chainsaws and Trimmers they Do Not Bog DOwn Under a Load. Occasionally you May have to Turn this Counter Clockwise to Achieve the Proper Revs.**
>>Now Allow the Engine to Idle. Set the Engine Idle Screw (Not Idle Air) so the Engine will Stay Running if Required.
>>Now Set the Idle Air (L) Mixture Screw so there is No Hesitation when Rapidly Throttling from Idle to Full Throttle. Reset the Engine Idle if Required.****
Please, Do Not Hesitate, If I Missed Something or you Hit a Snag or this Does Not Correct the Problem, I am Here if You Require More Assistance.
Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Be Safe and Be Happy. Thanks.

Good Luck

Respectfully

jbridger (John)

May 14, 2009 | Homelite Hedge Trimmers

2 Answers

Thihl HL75 hedge trimmer engine will not run at full speed


Remove the cutting attachment, insert a screwdriver in to the shaft receptor and it should operate smooth with a slight bit of friction. if not then check the blade bolts and make sure the blades move freely. Lubricate the blades and the gearbox regularly. If the attachment end is good then turn the driveshaft by hand (with attachment still off shaft). If this too moves freely then go to the clutch.

Apr 04, 2009 | Oregon Scientific Complete Carburetor for...

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