Question about Oregon Scientific Complete Carburetor for Stihl 4122 Brush Cutter and 4226HS Hedge Trimmer

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Blade in ts 400 brushcutter keeps spinning at idle speed

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Chain saw won't keep running

There are 2 adjusting screws, one is idle speed and the other is mixture. Adjust the idle screw until it keeps running. That may be all you need. But to check that the mixture is right turn the mixture screw, quarter turn at a time, keep count! until it flutters or speeds up. If it speeds up stop and adjust the idle back a quarter turn at a time until it runs without the blade turning.

Oct 25, 2016 | Garden

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Hi I have a stihl ts420 it works well and it cuts but the blade won't stop when it's on and it keeps spinning when I'm not holding the gas how can I fix that problem??

I don't know what all these people are talking about. If your saw is used frequently and not new anymore, it's very likely your clutch springs are worn to the point where they no longer hold back the clutch shoes from coming in contact with the clutch drum anymore and at ANY rpm, they contact the drum and cause it to spin. This also happens often when the saw is given throttle when the blade is binding, it wears the shoes and causes heat which weakens the springs. I'm not positive it's this, if you have ever tinkered with the carburetor it's possible it's idling too high yes, but I'm fairly certain that the clutch springs are worn or stretched out or perhaps one may be broken. This is why string trimmers sometimes keep spinning when the motor is at idle. Start the saw and let it get to operating temp, then without giving it any gas, lower the blade to a hard surface and see if it keeps running or if that stops the motor. If it stops immediately, it's a fair bet the clutch needs replacing.

Sep 19, 2014 | Saws

1 Answer

How to adjust idle speed on kawasaki td40 brushcutter ?

Most idle speeds on brushcutters/ trimmers are controlled by a small screw that touches the plate the cable pulls. Screwing it in holds the throttle a bit wider open and the idle goes up accordingly

Feb 25, 2013 | Motorcycles

1 Answer

First my Stihl Quikcut was getting too much gas now after rebuilding the carb it's not getting enough

Not sure who told you about the compression but that is not true, are you sure the throttle rod is actually pushing the throttle shaft open?

Mar 17, 2012 | Stihl Concrete Cutoff Chop Saw Clutch...

1 Answer

Hi, my Stihl ts 400 blade runs at idle.I have tried adjusting the idle down as far as I can but it still turns.

seems that ur clutch is sticking.take recoil caseing of and check by turning blade by hand,if you feel the engine turning over,then your clutch drum is sticking,be sure to remove ur spark plug cap! it will be the bearing at the rear of the clutch drum,maybe a little oil and a few turns will help it free itself.hope this helps.

Dec 06, 2011 | Stihl Concrete Cutoff Chop Saw Clutch...

1 Answer

I have a Homelite Z830SB Brushcutter. I use it with the blade attached rather than the line, for cutting. It starts fine, but it does not engage (i.e. the shaft does not there is no rotation in...

the inner shaft could have broken, which is the case a lot when using the blade vs the string remove the shaft from the motor, and spin the inner rod and see if the blade turns, if it does check the end of the rod and see if its damaged in anyway , if the blade doesn't spin, the shaft has broken and will need replacement

Jul 03, 2011 | Homelite Garden

1 Answer

Brand new Echo cs-400 chain saw: The chain spins fast on idle. Should'nt the chain be stationary on idle?

The manual is available here:

The idle speed of the negine may be too high.
Page 26 of the manual gives instructions for adjusting the speed with the "T" screw on the carburettor.

May 12, 2011 | Echo CS400 18" Chain Saw

1 Answer

Head of brushcutter does not spin

Check the centrifugal clutch attached to the motor, also check that the cutter blade is tight. Check that the drive tube is not sheared.

Jan 17, 2011 | Ryobi Garden

1 Answer

I have a makita backpack petrol strimmer fitted with a line head can i fit a brushcutter blade instead i donot have the full model No it is a 41cc engine it is an early model

Hi Doug,

There are adapters for just about every combination of trimmer, brush cutter blade, grass gator, etc. you can think of.

One of the most handy purchases has been a non specific arbor adapter set. Not only does it have 2or 3 each of the most common nuts in both left and right hand thread, it has inserts that keep every blade, flail and brushcutter I've tried dead center.

It even came with a diamond shaped one for a skillsaw blade that I tried with my Ryobi 4 cycle. That thing turns thorny blackberry vines to powder.

So the answer is yes.

Best regards
Mike c14e50c.gif

Aug 14, 2010 | Garden

1 Answer

I have a Ryobi RLT 30CESA with the strimmer attachment. What do I need to fit a Brushcutter blade to it

I would not put a brushcutter blade on this unit. The curved shaft quik disconnect may not hold up to the shock torque created by the brushblade. It may damage the drive shaft since it is a curved shaft quik disconnect model. You may have to purchase a straight shaft trimmer to get that job done.

Oct 02, 2009 | Garden

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