2 stroke running lean

[briscoe]

Ive got an echo 2600 long reach trimmer running lean.

I brought it second hand recently from a chap who had it serviced December 2016 at a local reputable dealer. Receipt for service was £140 -  plug, filters all done etc. Unused since.

starts easy and runs well until hot then starts hesitating when reving up. Also when at high revs looses power. 

checked the plug and its white - running lean.

Ive backed off both the mix screws to get more fuel in which helped. (they have limiters on for emissions which only allow very small adjustment- might try and remove?)

Have noticed fuel/oil residue around the base of unit where engine connects to the pole. 

Any suggestions as to what might be wrong with it? 

Edited August 29, 2017 by briscoe
more info

[daveatdave]

the exhaust might be full of carbon not letting the gases escape quickly enough 

[Stubby]

8 hours ago, daveatdave said:

the exhaust might be full of carbon not letting the gases escape quickly enough 

That wold tend to make it rich and the plug would be black .  I think it has an air leak making it run lean . Maybe from the crank case halves as you can see residue maybe a split hose etc

[lurkalot]

Check the fuel filter in the tank, they do block up on these machines, also check the pipes haven't gone like putty, or perished.  If the pipes have gone soft they will collapse with any restriction from the filter, normally resulting in cutting out.  These pipes also rot and fall off in the tank quite nicely.

 

The fuel / oil residue might actually be grease from the gearbox which has worked its way up the tube, also quite common especially if someone's a bit keen with the grease gun. 

 

Although it had £140 spent on the service, did they change the diaphragms?  I know they should have at that price, but you never know.

Edited August 30, 2017 by lurkalot

[briscoe]

Thanks for replies. Will check out the filter and lines in tank. 

 

The crankcase halves - would that be gasket leaking?

 

Possibly right with the oil leaking up polefrom gearbox . Machine had been standing for 6 months approx.

 

Think it was just filters plug new cord and blade sharpen at service. When you mention change diaphragms - what's this?

 

 

[briscoe]

Think it may be the corrigated fuel tube inside the tank connected to fuel filter. Went to take out and it was very cracked virtually fell apart! Ordered new one and will see if solves problem. Cheers