300ex HELP

[theduke300]

ok guys so earlier i was ridin my 300ex(look in sig for details) and im in 3rd gear about half throttle just cruisin and all of a sudden it quits. i had no idea what was wrog so i just flipped on the reserve and tried to crank it again and the it tried to but it sounded like it was just spinnin. my dad and me both thought maybe the timing chain but not forsure. wanted to get some opinions on here before i tore into it. any help is appreciated

[theduke300]

anyone???

[theduke300]

never thought it would be this hard to get help

[smr]

couple of things to try. Crack open the drain on the carb and make sure you are getting gas. If your getting gas then check for spark. If you not getting gas then make sure your vent tube isn't clogged.

Let me know what you find.

[theduke300]

thanks for the reply. got fuel and spark. thanks again

[smr]

remove the hose from the airbox to the carb. Put some gas in a spray bottle and spray a small amount into the carb. If it hits then you have carb problems. If it doesn't then you need to check compresion.

If it's the carb the first thing you want to check in the needle. The are bad about slipping out of the holder on a 300ex. They will drop all the way through and be sticking trought the main into the bowl.

let me know what you find.

[finsteratv]

like what was spinnin? starter?

[theduke300]

finster: yea the sterter.


tried the gas in spray bottle and im pretty sure the carb is good

[sm00th026]

Sound's like it jumped time.If you have spark and sprayed gas straight into the motor and it didn't hit.Sound's like a timing chain problem.

[smr]

noh check the compression. Running that K&N you might have eaten the rings up. K&N is fine for road vechicles but they let way to much dirt through for off road. I run Uni.

If it jumped time then it would either be real hard to turn over or no compression and turns over really fast. Just pull the spark plug and check to see if you have compression.

[sm00th026]

Um, Is it burning/using oil,or smoking??