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Join Date: Jun 2007
Posts: 1,761
KS
04-15-16, 04:37 PM
#1
Stihl FS45 weed trimmer
I had to give up on one due to the cost of diagnosing/fixing was getting to close or more than a new one.
It will become a winter project just to satisfy my curiosity and perhaps learn me a thing or two.
When I got to it I could not get fuel to prime through the bulb. Checked all the fuel lines and filter..all checked ok. New carb, would prime, but same result, not even a burp let alone a bark even with starting fluid in the cylinder or the carb.
Compression is 120 psi. Even went so far as to check the flywheel key. It has good spark even under compression. Tried mixture settings all the way from 3/4 to 2 turns out in steps.
Not even one bark.....
My counter part Mech also went through his motions and had the same luck as I did so....looking for ideas.
It will become a winter project just to satisfy my curiosity and perhaps learn me a thing or two.
When I got to it I could not get fuel to prime through the bulb. Checked all the fuel lines and filter..all checked ok. New carb, would prime, but same result, not even a burp let alone a bark even with starting fluid in the cylinder or the carb.
Compression is 120 psi. Even went so far as to check the flywheel key. It has good spark even under compression. Tried mixture settings all the way from 3/4 to 2 turns out in steps.
Not even one bark.....
My counter part Mech also went through his motions and had the same luck as I did so....looking for ideas.
Just needs a bigger hammer
Peace
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Forum Topic Moderator
Join Date: Jul 2001
Posts: 16,567
GA
Forum Topic Moderator
Join Date: Jun 2007
Posts: 1,761
KS
04-17-16, 07:32 AM
#7
It had a bosh in it originally, also tried champion, ngk and oregon plugs, all test good with inline tester but no go with any.
My partner in crime did have it at one point spitting fuel out the exhaust...??? Will try removing the muffler, then dig further into the timing issue which is the only thing the two of us could figure must be the problem.
My partner in crime did have it at one point spitting fuel out the exhaust...??? Will try removing the muffler, then dig further into the timing issue which is the only thing the two of us could figure must be the problem.
Just needs a bigger hammer
Peace
Forum Topic Moderator
Join Date: Jul 2001
Posts: 16,567
GA
04-17-16, 05:21 PM
#8
If the crankcase is soaked it may be flooding the whole time. Try blowing it out with compressed air into the plug hole while you crank the engine slowly. Then try to start it with a few pulls and the throttle wide open. If still no pops or promises, disconnect the fuel lines from the carb and try again with the throttle open several times until it starts or you become convinced it won't 
. I had one just a few days ago that did this to me, it was a FS74. It didn't really look flooded but it would not start with the fuel lines connected.
. I had one just a few days ago that did this to me, it was a FS74. It didn't really look flooded but it would not start with the fuel lines connected.
"Who is John Galt?" - Ayn Rand (Atlas Shrugged)
God bless!
Member
Join Date: Aug 2015
Posts: 243
LA
04-18-16, 03:35 PM
#9
I got a Troy Bilt weedeater last week and did not want to pop at all I took the crank cover off and it had water in it. No scoring on piston or cylinder. I had a carb to put on it. After cleaning the crank case and re assembly it ran great.
The bottom shaft was junk so I put a husky shaft and line head on it. Now I can't sell it cause my wife claimed it ~!~!
The bottom shaft was junk so I put a husky shaft and line head on it. Now I can't sell it cause my wife claimed it ~!~!
