Who rebuilt it? If you did the build did you install the cam with the dots on the gears or did you install the cam and and degree it? If with the dots on the gears did you aligned the crank gear dot out under the teeth or the one on the inside above the crankshaft key? If the one above the key you need to use the one on the outer edge of the crank gear. If you didn't do the build call the one who did and tell them to come fix it Let us know what youy find and do, it will help a lot of others on here also