Stihl 018 help

[s.varty]

Had a call from a farmer friend asking for help concerning his 018: Starts and ticks over, revs up to around half throttle no problem, as soon as he tries any higher revs it gasps and dies as though its being starved of fuel. He has changed filler cap , spark plug, air filter and cleaned the carb throughout. Any thoughts would be appreciated, cheers , its a 2001 model ,my advice was chuck it on ebay and buy a new one.

[spudulike]

Sounds like lack of fuel. Check the fuel line and fuel filter, the metering arm height, the gauze filter and pump gasket!

[bmp01]

As above but if it's sat for a while or had old fuel, it could be a part seized engine and you've got no crankcase pressure to operate the fuel pump in the carb. Whats the compression like on the pull cord?

What's the saws history? Has it gradually got worse or completely fine one minute, broken the next? Has it been stored for months on end?

Start with the easy stuff, fuel filter, fuel line, impulse line for the fuel pump. Beg, borrow or buy a known good carb to rule that out.

 

You can inspect piston with the exhaust off, that's quick and easy, good one to tick off the list etc.

 

Or take it in for repair / send it to someone to fix.

 

bmp01