Where can i get new plastics for my yamaha grizzly 600..that are not very expensive

There isn't one. You have to put one in-
line

Removing The Rear Brake Drum & Shoes on Grizzly 600 ...

? 5:04
www.youtube.com/watch?v=n5oO7v3nT6s
Mar 11, 2012 - Uploaded by myquadrepair
Removing the rear brake drum & shoes on Yamaha grizzly 600. ... Yamaha Big Bear Oil Change and More! - Duration: 10:43. by jfrost77hd ...

HONDA FOREMAN REAR BRAKE CHANGE PART 1 ...

? 11:49
https://www.youtube.com/watch?v=xQanZdlDCI0
Jul 17, 2012 - Uploaded by 400EX99N
HOW TO CHANGE REAR BRAKES ON A HONDA ATV. ... is this about the same for a 2004 yamaha big bear 400? Read more Show less.

Is it belt drive , if it is you might pull cover off and clean out mud and water .

worn clutch

If you need further help, I’m available over the phone at https://www.6ya.com/expert/michael_00678fd4800d19c5

change the selioid

any spark while cranking?

Check fuel filter.

try turning your idle down, i have a 98 grizzly 600 and the other day it was cold so i turned the idle up to start it and wen i put it into gear i would drive itself if ur idle screw is in the same place as mine it should be above the engine beside ur left leg turn it left to turn it down wen ur idle is up ur motor is reved to hi wen going into gear hope my advice helps

you may have a collapsed lifter