That depends entirely on what's wrong with it. If you have no knowledge of this fairly complicated machine, you should take it to a 'small engine and lawn mower' repair shop.
100 cc's biggest saw Homelite made
fuel mixture for homelite chain saw
4.5 cu in or 74cc
Go to the Homelite website (homelite.com ) and go to the service and support tab
32:1 32to1 ratio is was we run on all the homelite chainsaws and blowers that we repair in my shop
50:1 has been working for over 20years for me
The 330 displaces 3.3 cubic inches, which is about 54 cc's.
40 parts gas to 1 part oil.
For Homelite chain saws, it's recommended to use high-quality bar and chain oil specifically designed for chainsaws. This oil helps lubricate the chain and bar, reducing friction and wear during operation. Avoid using motor oil or other substitutes, as they may not provide adequate lubrication and could damage the saw. Always check the owner's manual for specific recommendations for your model.
you will need a ratchet, extension, 1/2 inch socket & a flat head screwdriver. Loosen the bar tension screw until the chain is loose. Then remove the two nuts & remove the bar, slip the chain from around the gear
The longest recommended was 31 inches. http://store.chainsawr.com/
It should tell you the ratio on the saw.