~~~ STRING TRIMMER PROBLEM ~ ~ ~

[LBrown59]

Stihl FS 46 won't start won't even hit a lick. It's a 2001 I bought new 9 years ago.
Never had a lick of trouble with it till now.

The following has been done so far,but still no go.
New clean fuel .
Carb cleaned & new diaphragm installed.

Any one have any other suggestions ideas tips.

 

[rekees4300]

Is it getting a spark?

 

[RadarTech]

He took my answer..
BUT is the plug spark weak? is the plug 9 years old?

J

 

[LBrown59]

Forgot to mention the new plug.

 

[RadarTech]

how is the compression?
here is a don't do this at home trick:

Take the plug out, set a lit propane torch behind the plug hole and pull the rope several times..

nah-- that sounds like one of those hey yall watch this videos....


do you have one of these:
AutoZone.com | In line ignition spark tester | In line ignition spark tester

I have a similiar one for my toolbox for small engines.. But it is not quite the same..

a couple of times when working on push mowers I have seen the flywheel key that had skewed slightly not get a strong spark. anyway, I could see a spark on the plug but it was weak on this type gadget...

pulled the flywheel off and sanded the magnets, replaced the key and walla!

anyway, is it electronic ignition?

J

 

[irvingj]

LBrown-- in addition to the previous posts (spark? fuel?), you might take a look at the crankshaft seals, especially the lower one.

I'm guessing that's a 2-stroke engine; if the seals are worn/leaking, it'll never "suck" enough to pull fuel/air in during the upstroke of the piston, even if the compression is fine.... A good test for this is a QUICK shot of starting fluid at the intake point. If it fires right up, that may be the problem- it's pretty common on 2-strokers that have some age.

WBB in NH

 

[arrabil]

Shoulda bought a Deere.

 

[RadarTech]

Shoulda bought a Deere.

with a loaded spool... wait does a heavier spool cut better?

and what do you use to load it with ? beet juice or ???


it has truly been a long day.......

J

 

[jbarker855]

Don't mean to harp on something that you have probably already addressed, but did you actually see spark? New plug does not necessarily mean you have spark (could have a bad coil). Let us know.
-Jay

 

[wendallb]

Yes you need to know there is a spark getting to the plug. If there and pin holes in any of the fuel lines pump bulb you will not get fuel to the carb. Also check the exhaust ports to see if they are stopped up..