I have a problem with a trimmer that I bought 2 years ago. The trimmer starts very easy and idles smoothly. I start to use it and there is no problem; however, the more that I trim, the more that the engine seems to bog down. At the end of 10-15 minutes the head goes so slow that it is worthless to try to trim. I do not have the trimmer running at full thottle the whole time. (Example, I pull the throttle, trim around a post, release the throttle, walk, pull the throttle, trim around a stump, release the throttle, etc.) The engine idles at a normal speed when the thottle is released, it is just when the throttle is pulled and the trimmer head starts to turn does the engine seems to labor but it happens gradually.

 

When it starts to bog loosen the fuel cap to see if it improves, the cap may not be venting properly. Have a good one. Geo

 

Does the head become difficult to turn manually as it gets hot?

 

Forgot to list the model: TB80EC

I tried the gas cap; I even removed the gas cap while the trimmer was running but there was no difference.

The head turns very easily by hand after the trimmer warms up and develops this problem.

A friend reminded of something that I did to the trimmer last year; I had forgotten otherwise I would have mentioned it. This trimmer has a quick link/change adapter on it; when I was cutting branches from trees I used the chainsaw pole pruner attachment on this trimmer instead getting my 4 cycle trimmer. The 2 cycle did not seem to work with the pole pruner so I went and got the 4 cycle. Could the pole pruner damaged the 2 cycle?

 

So does it seem like the engine is trying to turn it and can't, or the engine is just progressively running worse?

 

It seems like the engine is having difficulty turning the head.

 

check behind the air filter theres a little ristricter in there and if that becomes clogged it will have less power and wont idle right i usually personally cut it out cause its pretty easy to get clogged