Questions and Answers for ECHO 21.2 cc Gas 2-Stroke Straight Shaft String Trimmer

A:  Hi there! Thank you for your inquiry. The SRM-225 is the updated version of the SRM-2100, both models have the same engine displacement of 21.2 cc. If you inquire more information on the updates of this mode, please contact ECHO’s Customer Support Department at 1-800-432-ECHO (3246). Please have your model and serial number ready. Our representatives are available Monday through Friday, 8:00am to 4:30pm CST.

A:  Hi Jeff! Thank you for your inquiry. The difference between both models is that "H" Hip unit will have the trigger on your left side by your hip; the "T" Tube unit will have the trigger on the right side and on the blower tube area. If further information is needed, please contact ECHO’s Customer Support Department at 1-800-432-ECHO (3246). Please have your model and serial number ready. Our representatives are available Monday through Friday, 8:00am to 4:30pm CST.

A:  The Speed-feed 400 head accepts .080 in. - .095 in. diameter line. It can be modified for .105, but you may experience feed problems. I have seen other people use .105.

A:  The Speed-feed 400 head accepts .080 in. - .095 in. diameter line. It can be modified for .105, but you may experience feed problems. I have seen other people use .105.

A:  Hi there! Thank you for your inquiry. The SRM-225 Model comes with the Speed Feed 400 Trimmer head - Accepts up to 20' of .095" - .105" line diameter.

A:  Hello! Thank you for your inquiry. The SRM-225 Model comes with the Speed Feed 400 Trimmer head - Accepts up to 20' of .095" - .105" line diameter.

A:  Speed feed 400 head accepts .080 in. - .095 in. diameter line

A:  Let's say you are starting with a 32-ounce container of a 40:1 fuel mixture. 32 ounces divided by 41 parts is .78 ounces. So you would have to add 10 more parts of .78 ounces or about 7.8 ounces of gasoline to the 32-ounce container to fix it. Now, 50:1

A:  You probably could, but the engine is set for 50:1 fuel mixture. It may not run as well since the engine is set for 50:1 and may have excessive carbon build up. Also could void warranty. I wouldn't use Trufuel.

A:  Can't I use 105 line in echo trimmer

A:  No you cannot this is a single straight shaft string trimmer if you want to use a different attachments and still stick with the echo brand you would need the pas system which is the base tube with a trigger assembly and the 21.2 cc engine. It takes different attachments such as hedge trimmers, edger, and string trimmer. I hope this helps 🙂

A:  You shouldn't continuously run a 2-stroke engine a full throttle. But, to better answer your question, it's more than adequate to do the average consumer's full yard.

A:  You shouldn't continuously run a 2-stroke engine a full throttle. But, to better answer your question, it's more than adequate to do the average consumer's full yard.

A:  Hi Tomm! The wide open throttle speed is 8,000-10,000 RPM. The idle speed is 2,400-3,200 RPM.

A:  Hi Rich! The 2-stroke ECHO products require a 50:1 fuel and oil mixture.