I replaced the carbon brush yet does'nt work. what is the problem all seem look all right

Remington Pole Saw Carbon Brushes
If you're Remington Pole Saw is slowing down, throwing sparks, overheating or not starting you may need to replace the carbon brushes. Replacing brushes and cleaning commutator early can prevent damage to motor armature!
Remington carbon brushes on E-bay Search for:
Remington Pole Saw 8 AMP Carbon Brush

Remington Pole Saw Carbon Brushes
If you're Remington Pole Saw is slowing down, throwing sparks, or not starting you may need to replace the carbon brushes. Replacing brushes and cleaning commutator early can prevent damage to motor armature!
Remington carbon brushes on E-bay Search for:
Remington Pole Saw 8 AMP Carbon Brush

Yes, It seems that the motor seems to be the fault
Check this link: brushes

Have you checked the carbon brushes within the motor, chances are they are worn. you will need to remove your motor to get to the 2 carbon brushes.these will be in a plastic casing, held in place by 2 screws. There is just 1 wire going to each brush. When brush is removed, the carbon should be at least 20mm long. If not replace with new

If it has not run for awhile, check the brushes. they might need to be replaced. The plug is usually moulded right on power cord. That might have to be replaced because if there is a problem with a broken or disconnected wire right at plug there is no way to see it. Hope this helps.

You need to replace the carbon brushes on the motor. Below is a link to the part.
http://www.appliancepartspros.com/part_details.aspx?part_id=2822714

You need an AC voltmeter to trace the problem with the switch. It can also be a bad motor brush/spring--these saws are great for killing motor brushes, and there are virtually no replacements available as Remington has ceased saw operations. If it is a bad brush, visit an electrical tool shop to see if they have something that will work from a different brand of tool. Good luck!

when u changed the carbon brushes did u move the little metal pin to free the carbon off it must be able to come out then in with ease if not do this if u did then if the carbon brushes have got too low then it will have more then likely damage your motor m8

The carbon brushes in the motor need to be replaced. Very IMPORTANT....... DO NOT run the Kirby anymore until you get this fixed. If you do, the armature will be in danger of being damaged. (and that part is expensive!) The carbon brushes are reasonably priced, and you can use this online guide to get to them and change them. It's a guide for replacing the power switch, but it will help you change the carbon brushes too. Hope I've helped...
Marci

http://reviews.ebay.com/REPLACING-THE-POWER-SWITCH-ON-ANY-KIRBY-G-SERIES-VACUUM_W0QQugidZ10000000003752018

more than likely your carbon brushes which are situated in your motor locatable by a single wire on each side of your motor going into a plastic casing that holds the carbon if it doesnt have carbon brushes than it will have a module which is about 4in in length and is a circuit board this will need replacing which in some cases is not cheap at all