drive sprocket locking at low speed

[ant797]

my drive sprocket locks up at low speed causing the bike to skid to a stop i have to roll it backwards to unlock it took me a while the 1st time and at higher speeds it jerks threatning to lock up witch is scarey does anyone know how to fix this

 

[Anton]

Sounds like your chain is too loose. Tension it with the chain tensioner, but not too much. Make sure it has about an inch of deflection from normal.

 

[ant797]

now its gone the oposite it doesnt lock at all even without the clutch depressed so theres no drive

 

[ant797]

oops forgot to put the spark plug back in thanks runs fine with the chain tensioned must of stretched or the tensioner shifted positions

 

[Anton]

Yep the standard chain tensioner can come loose and shift on you depending on its design.