My 2006 660 yamaha grizzly wont start, it just burns its priming then dies, battry is dead but i have jumper cables on it its turning over fine,spark is good ,how much gas line pressure should be on it

Connect Jumper Cables to Ground (A Clean Metal Surface) and to Output Side Of Solenoid - Hook Other End Of Jumper Cables to Car Battery Momentarily to By-Pass Starter Circuit - If it Starts you Have a Bad Solenoid Or A Weak Battery On ATV. Contact me for additional help! "https://www.6ya.com/philip_b05beb373d913f26"

Check oil level capacity, to ensure in specs. Check spark plugs, ensure its clean and correct plug for your quad.the only other could be is ign coil breaking down when warm. Check fire at plug when this happens. First ensure oil level is correct. Make sure your electric fan is on when bike is warmed up.

have some one do a compression test as a valve may be stuck open
check for spark at the plug

OK, have you check is the charging system is working correctly? The alternator should be charging the unit. Does you battery hold power(12.5V Minimum)? If the problem is not the charging system, check for Fuel issues. Does the gas pump delivering fuel to the EFI/Carburetor? Also try to clean the spark plugs and check if the ignition coil is working correctly.
Basically your wagon problem sounds as if it is Ignition/fuel issue. If it turns on then dies means that either there is spark issue or gas issue. Not enough fuel goes into the combustion change and it gets cut off right after turning on.

Have you tried replacing the spark plug?...Put a new one in it anyway - you ELIMINATE a problem very inexpensively!



Do you have gas in it?



Is there gas in the float bowl? There is a screw or bolt in the very bottom of the carb float bowl, loosen it and gas should flow out freely. If not. there is the first problem I would get repaired.

Keep me posted and if this doe not fix it, we'll try other options.

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.

possible blocked carb- also check ohms reading on sparkplug cap should be no more than 8 ohms

First check the fuses.check the start ,run switch,there should b some kind of protection for this..possibley a in line fuse??

firstly check your fuel .
how old is the fuel in the tank ?
Have you left the bike in the rain and water might found its way in the tank .
check your spark plug which may be burned .
check if you have a spark .
check your HT cable to your spark plug
the HT may be dead too and may have burned out which is common .
if you have a spark at the plug , check if fuel flows to the cylinder .
try to start the bike without the spark plug in place and try to smell fuel .
if you cannot smell fuel while trying to start your bike you may have a problem at your carbi and it will need cleaning .
the last thing i hope its not ... the main ignition unit which regulate the power to the HT unit and if this unit has died you will have to replace it but may be costly

Check the carb boot were it attaches to the cylinder head and see if can notice any cracks or hole in it.