Some of the finest weed trimmers come from brands such as black and decker and also JOHN DEERe because they are efficient to use throughout a number of years.
Trimmers, Weedeater, Weedwhacker, String trimmers.
Electric trimmers are more convenient as they can be charged at home, but may not last as long as gas trimmers before needing to be recharged.
One of the best weed trimmers available is the Black & Decker CST800 12V 8" Cordless String Trimmer. If yo want a professional grade gas trimer then try Husqvarna 28 cc Full Crank Gas Straight Shaft String Trimmer
They are made by Ryobi which was briefly bought by MTD and made trimmers with several of the MTD-owned brands. Now I believe it is still partially MTD-owned, but is a separate entity.
String trimmers are great for standard tasks such as weed clearing. However, many string trimmers can also support a blade attachment, which can be much more effective at cutting through very heavy brush .
DR has three models that are electric start
The Weed Eater brand of trimmers have very few spool tangles
The recommended cord diameter really depends on the type of machine you're using. Electric string trimmers are usually limited to 2.5mm maximum diameter, while gas trimmers can handle 2.75mm or even metal blade attachments.
A couple options are available for trimming your lawn besides a bulky mower. You can either get a yard trimmer, which is like a weed whacker, or the newer battery powered yard trimmers, but they are not recommended for bigger lawns.
The Black and Decker are known for there ease of use and reliability.
Check your user manual or the dealer that sells your brand. The mix could be 1:32, 1:40, or 1:50.
Throttle cable is probably pinched somewhere, or check the butterfly on carburetor, might have a broken return spring, or debris binding the shaft.