FS400 problem

[Paul Smith]

Hi, had a day with the mulcher/shredder blade on today, great bit of kit for the brambles! However late on in the day there was a problem. After about 5 minutes of constant running it would loose power and stop running. If I re-primed it it would run again.

 

I'm thinking fuel problem, maybe a blocked breather or getting in air?

 

Any thoughts please?

[Paul Smith]

Going to have a look later today.

[burrell_]

iv just had this same problem 2 weeks ago iv just rebuilt the carb with a carb kit and tuch wood it ran on sat for 30mins with out stopping

how old is the machine

[Paul Smith]

It's an older machine, will check when I get back in. Hope it's not a carb!

[burrell_]

If its the same one as mine it has no H or L on the carb

28 pound for a carb kit

[Paul Smith]

What does the carb kit comprise off?

[Maico490]

What does the carb kit comprise off?

 

For £28 it would probably consist of a new carb in the States. Rather than upsetting sponsors Google this:

 

authorised dealer zama walbro uk

 

Brilliant bloke who knows carbs inside out and cheap.First thing I would check is the screen in the carb but after that if it is the Zama with only the idle adjust then test the main check valve before spending any more money. You can replace them but not simple:

 

http://arbtalk.co.uk/forum/maintenance-help/31033-stihl-fs-400-cant-get-idle.html#post504292

Edited August 15, 2012 by Maico490
Missed something

[Paul Smith]

Thanks, interesting reading!

[Paul Smith]

My Carb has H,L,LA adjustments. Filter cleaned including fuel filter. Checked all bolts and hoses. Can't see any visible splits or holes. Seems to be running ok, I will stick a tank of fuel through it and see if I can get it to play up!

[Dean Lofthouse]

My 450 had the same problem and it turned out to be the gauze filter inside the carb. If you take the carb off it's under the cover plate held on with the single screw in the middle of the plate. Sometimes they look clean but if you get a magnifying glass you may see the gauze screen blocked with very fine particles