I've had a RedCat 150 for about 4 months now and it has always run great. However their is a vibration noise when it's 1/2 throttle... I can't fine it but it may be coming from the motor???? Let off the throttle or increase the throttle and it goes away.... When i got it i check out all the bolts and check it last week and found nothing loose.
It anyone knows what it may be, please let me know.....

Also, whats this i here about changing out the air intack box????

thanks,