I have a 1976 harley fl engine in a custom frame. I recently replaced the rocker boxes. Before I did it, it ran fine. Now it will only backfire out of the front exhaust after the compression stroke. I am still getting spark out of the coil and I switched to electronic ignition, so it isn't the points. Any help would be appreciated. Thanks

 

Did the pushrod seat into the rocker arm on the frt exhaust?