Fordiesel69
ArboristSite Member
Up front apologies this will be long.
In 2020 a local OPE dealer had weekly customer reject piles and I always bought truckloads of trimmers and blowers to refurbish and sell locally on CL. At that time I hated working on saws and would leave them behind.
After picking up a whole load, the following week there was not much in the pile and the owner talked me into this echo 670 for $40 bucks and I took the gamble. It was missing the bar and chain. Had excellent compression but it would not start.
After alot of effort it simply would not start. The piston had scored and transfered a nice streak of aluminum onto the cylinder. I ended up using acid and some emery cloth to get the aluminum off the cylinder and the hard plating survived. Cleaned up real nice and it got a fresh oem echo 2 ring piston kit that was original to the 670. I was not aware of the 680 1 ring piston at the time.
After reassembly it ran terrible and could not be tuned. Any time you touched the carb with a screwdriver, it would go lean and die. I shelved it for a year and found out there was more to this story. After taking it apart 3 more times I shot gunned a new oem intake boot and discovered I most likely pinched the impulse hose due to an assembly error on my part. There was nothing wrong with the old boot. On final assembly, it still would not tune, but it ran way different now. When I re checked the carb for the last time the diaphragm came off with it's backing plate and I decided to peel it off. Voila! The cover plate was packed with fineings and prevented the diaphragm from moving. That fixed it. Now tuned and broke in. How could I have missed something so stupid. Threw an archer 20in D176 mount bar and rocked on. Hindsight would have had me go with a 24 instead..
After all of that, I was able to learn and finally gain enough confidence to refurbish about 20 more junkers of different brands.
In 2020 a local OPE dealer had weekly customer reject piles and I always bought truckloads of trimmers and blowers to refurbish and sell locally on CL. At that time I hated working on saws and would leave them behind.
After picking up a whole load, the following week there was not much in the pile and the owner talked me into this echo 670 for $40 bucks and I took the gamble. It was missing the bar and chain. Had excellent compression but it would not start.
After alot of effort it simply would not start. The piston had scored and transfered a nice streak of aluminum onto the cylinder. I ended up using acid and some emery cloth to get the aluminum off the cylinder and the hard plating survived. Cleaned up real nice and it got a fresh oem echo 2 ring piston kit that was original to the 670. I was not aware of the 680 1 ring piston at the time.
After reassembly it ran terrible and could not be tuned. Any time you touched the carb with a screwdriver, it would go lean and die. I shelved it for a year and found out there was more to this story. After taking it apart 3 more times I shot gunned a new oem intake boot and discovered I most likely pinched the impulse hose due to an assembly error on my part. There was nothing wrong with the old boot. On final assembly, it still would not tune, but it ran way different now. When I re checked the carb for the last time the diaphragm came off with it's backing plate and I decided to peel it off. Voila! The cover plate was packed with fineings and prevented the diaphragm from moving. That fixed it. Now tuned and broke in. How could I have missed something so stupid. Threw an archer 20in D176 mount bar and rocked on. Hindsight would have had me go with a 24 instead..
After all of that, I was able to learn and finally gain enough confidence to refurbish about 20 more junkers of different brands.
