Hi Eddie. I see that this is your first post, so welcome to Outdoorking. You have posted in the correct section for members to be able to help you fix your problem. Here at Outdoorking, there are many knowledgable members that are always willing to share information. I may not be an expert but may be able to help you somewhat nonetheless.
I found an owners manual: http://www.mcculloch.com/ddoc/MCCO/MCCO2007_EUenAPen/MCCO2007_EUenAPen__530163965.pdf
On any 2 stroke, when a machine comes in for a service, a good first step is to examine the condition of the engine. Scoring, piston or cylinder wear, rings stuck, bearing play are usually what I check for.
Now, you mentioned that someone had previously run the machine with straight petrol. I think that a good first step is to verify that it has done any damage to the piston/cylinder. I say this because when someone says they have run a 2 stroke with no oil, I get a bit worried and 9/10 the piston is extremely scored. I see this a lot on chainsaws, more then trimmers because chainsaws are always running at maximum rpm, whereas trimmers are not. But anyway it's always a good first step.
To do this, remove the muffler from the engine and shine a torch through the port. While turning the engine over look at the skirt of the piston and rings. Look for any deep scoring. Now turn the engine until the piston is all the way at the bottom and look at the cylinder wall (bore). This will be harder to see so look carefully.
If the previous owner had run straight petrol through the trimmer even for not long, then the piston will be severely scored on the exhaust side. Just a suggestion, try this before you go any further with it. I am now curious to see how long the straight petrol was in there for.
Last edited by James P; 27/07/13 05:17 PM.
