fs460 FS460 Brushcutter Problem

[Haironyourchest]

Hi All, my Stihl FS460 clutch housing cracked at the shaft sleeve last week, after 2 years of moderate use. Not impressed, anyway, sent for a new part and replaced, but now the machine won't run. Dies on the least bit of throttle, will run if I keep pumping the bulb. Tried new petrol mix, Aspen, no difference. I'm wondering if I broke or dislodged something while doing the clutch housing replacement...but I'm gentle, and don't think I did. What are the chances of a carb problem appearing the same day, essentially, as the clutch housing breaking? Could there be a connection? Any thoughts?

[lurkalot]

Depends how far you stripped it to change the housing.  If you haven't touched anything other than the top cover and the front housing then, perhaps you have nipped a pipe somewhere on reassembly.  Also make sure the fuel pipe in the tank hasn't folded over on itself and kinked.

[Richard 1234]

Have you knocked a wire loose? They are m tronic if I remember rightly?

[lurkalot]

19 minutes ago, Richard 1234 said:

Have you knocked a wire loose? They are m tronic if I remember rightly?

Richard, I completely forgot about the M-Tronic stuff, I blame my age.  Does make sense though, and worth checking out.

[Sheepy]

I've had my 2 apart a couple of times and it's surprisingly easy to get the case wrong without realising and Knip something, Also may be worth letting it run on 'start' for 90 seconds followed by a good rev up, should make it retune itself if it's not a physical problem. 

[Haironyourchest]

Thanks the the replies, I have disassembled it again, and will clean the carb. If that doesn't fix the issue, it'll have to go the the shop for diagnostics. Im thinking its a burned out m-tronic chip or solanoid.

[Haironyourchest]

Ok so I got the carb off and cleaned with break cleaner. Blew out lines, cleaned the terminals of the solanoids with electrical degreaser. The strimmer works again! But the diaphram gasket was glued on, and as I removed it with a stanley blade some the material ripped a bit, leaving a bit stcuk on the carb housing. I have removed this, and reused the gasket, crewing it down tight. So far the machine is working, but I wonder if the damaged gasket will cause running issues in the future that I might not even notice but could still be doing damage to the motor, like a tiny air leak or something?