No problem with our left motor but, the right motor on our speedster will run fine for a good 45 minutes but then if you slow to idle it will die and won't restart. we pull the plugs and let it cool off a while and it will fire up and run again. this has happened 5 times this weekend. The last time the motor wouldn't reve up any faster than 2500. That may be a seperate problem I don't know.