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I have a Stihl HS 45 gas hedge trimmer. It starts normally and runs good for perhaps 5 minutes. Then it loses power and RPM and acts like it is starving for fuel. I have an Echo PB4600 backpack blower that acts the same way. What are the possible causes? I'm a good mechanic if I know what the problem is, but this baffles me.

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I have same problem with my hs 45, great machine for a 5 minit job, then it just gives up. Next day it will start up first time again. What is the problem with this?

Posted on Jul 09, 2011

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Check the tank strainer, and use an external fuel supply, for testing purposes.I presume that you have changed any filters and cleaned other strainers....

Posted on Mar 15, 2011

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1 Answer

My HS 45 seems to drip oil while cutting, I think it is damaging plants. Is it because there is too much oil in the fuel mix?


Fuel mixture for that model is 50 to 1. Stihl also sell their own premixed fuel and oil which is Ethanol free and non aromatic.

I wondered if it has a blade oiler, but it doesn't. I does however have a gearbox with oil in it. I wonder if it is leaking. Do you know where the excess oil is coming from?

You model is listed here and the Manual and details of the fuel are on his page.

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Sharpen with a flat file. Its a long process as each tooth has 2 cutting edges. There are companies that will do this properly at cost.

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Check fuel lines, filter and carb... Sounds like a poor fueling issue. clean and replace carb diaphrams. Check gaskets between cylinder and carb.

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I need to replace the clutch that is screwed on to the end of the crankshaft on my Stihl HS 45 Hedge Trimmer. How do I get the old clutch off of the crank?


Remove the plug and insert a length of old pull cord into the hole, makin sure to leave some to pull it out with. Also making sure the piston is at bdc, you turn the clutch counter clockwise

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1 Answer

Still hs45wont start


Do you have good compression, good spark and is fuel getting into the cylinder.? More information is required.

May 19, 2012 | Stihl Hs45, Hs 45 Hedge Trimmer Bottom...

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My trimmer cranks good and starts off running good. After about 5 and sometimes as long 10 mins it will suddenly start running 1/2 speed. I 'm guessing something is getting hot and causing it to miss fire?...


the ignition coil is shorting out...it's a stihl thing...seen it too many times...get another coil...if it's new, it's under warranty (a dealership "must" repair to get warranty)...

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trace the llines from the primer bulb and check them for leake it is sucking air from somewhere either the lines or the bulb

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