how to take off...

[ghost civic]

i have a 86 yamaha 225dx. i want to try different cam timing, but cant figure out how to take off the cam gear. i take the cover off, and i see the gear with just one bolt. but the motor turns either way, so how do i stop the motor from turning so i can get the bolt off? also, does this bolt come off counterclockwise?

[200x350x]

the cam gear has a pin that alligns it on the cam you just cant move the gear but if you do hold the crank and take the bolt out

[Dirtcrasher]

Is the cam stock? why try "different cam timing"?? Is it aligned at TDC??........

Air guns allow us to remove things that normally holders are needed. Otherwise, i try to use a piece of brass or a penny between things to keep them from turning.

I always use a penny for torquing a crank or clutch nut.

[ghost civic]

i know that the cam gear has a pin to align it, i wanted to take it off, to move the chain on it. then put the gear back on. if there is a way to move the position of the chain on the cam gear without taking the cam gear off, please LMK.

i wanted to try different cam timing, cause it wont start. if i spray starting fluid into the carb or motor, it will fire and shoot flames out the carb. almost like the intake valve is open when the spark plug fires.
i have 2 carbs, both i tried to clean. the floats and float needle work on both, yet i dont get even a sputter with either carb. its like no gas is getting sucked through the carb. i can hear some suction on the intake stroke though. maybe its not enough?

[jeffatc250r]

I wouldnt touch the timing. Prob have a smoked valve.

[ghost civic]

whats a smoked valve? do you mean its damaged, needing to be replaced?