I have a 2012 yamaha 300 grizzly and it will noy charge, I have replaced the battery with a new one and it just drains the battery and it will quit after running for about a hour.Is there a way to check the charging system to solve this issue??

ATV IS NOT A CAR NOR IS ATV A MAKER
IS THIS A YAMAHA WHY SKIP SAYING MAKERS NAME/?
RAD FULL OF MUD (AS IN FINS)
THERMOSTAT IS BAD.
SORRY CAN NOT GUESS ATV AT ALL, AND 300 SAYS ONLY ENGINE SIZE, TO ME. 300CC

Put a new battery in it and add it to the price. ATV batteries are abused, they need a trickle charge if not used for a month. Expected life in a neglected state would be 3 to 4 years. Is it the original battery and 8 years old? Strip and clean the carburetor.

https://www.batteriesplus.com/battery/atv/yamaha/grizzly-300-automatic/300cc/2012

https://www.google.com/search?q=2012+yamaha+grizzly+300+clean+carburetor

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.055"-.065"

I take help from online websites that have this service like helping in repair some like reliable-store have instant help.. others are a bit slow which I don't prefer... rest is up to u.. U can also get free manual works fine .

Bleeding any hydraulic brake system is the same...build pressure and release with the brake caliper fitting ..fill the reservoir... repeat..

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.

Grizzly 660 Shifting problem. - Yamaha Grizzly ATV Forum

www.grizzlycentral.com > ... > Grizzly Engine & TransmissionMar 12, 2012 - 4 posts This is a discussion on Grizzly 660 Shifting problem. within the Grizzly Engine ....2005 grizzly 660 gear position sensor problem.

you should leave it in there, you'll have to retune the carb if you take it out. it'll run lean, destroy the motor, that kind of thing.

Check the coil and ignition system

check fuel flow and check spark at spark plugs

According to an "ATV Rider" 2009 article, "When the Grizzly was introduced in 1998 as a 600cc machine, the top was blown right off the displacement wars of the time."
It was replaced in 2002 with Yamaha Grizzly 660, an even bigger engine derived from the well-established all-terrain vehicle (ATV) Yamaha Raptor 660R.
Grizzly's 660 cubic centimeter (cc), four-stroke, liquid-cooled single overhead camshaft, five-valve engine performs well in open country, but sometimes it causes serious problems for owners.
Before you call a Grizzly dealer, however, trying a few tricks in your garage can save you a lot of time and money.

Check the fuel level.
Locate the fuel meter indicator on top of the multifunction display.
If it does not work properly, open the fuel tank, and push the Yamaha 660 Grizzly side to side.
Ensure the fuel is not contaminated by water or rust.
If you have not driven your Grizzly 660 for a long time, drain the tank completely, and fill it with a fuel tank cleaner.

Check fuel hoses for cracks or leakage.
The hoses should be soft and simple to bend.
Replace those that show any sign of wear.

Check the compression.
Screw a compression tester into the spark plug hole, and press the electric starter button.
If no compression exists, contact a Yamaha dealer.
Wipe wet or dirty electrodes with a dry cloth.
The spark plug gap should be checked regularly

Correct the spark plug gap.
Measure the gap with a wire thickness gauge.
If necessary, adjust it to 0.8mm using a screwdriver or replace the spark plug.
Use only a Yamaha-specified spark plug.

Check the Yamaha 660 Grizzly's battery.
Operate its electric starter.
If the Grizzly starts quickly, then its battery is in good condition.
If the engine turns slowly, check the battery lead connections, and you may need to change the battery.
If the engine still does not eventually start, your Grizzly is beyond home repair.