Hello Everybody!! This weekend was take your bike apart weekend... With my brother in law took my 1988 heritage apart, got a set of new gaskets, piston rings and did the job. Everything was done according to manual, torque values etc. Long story short, we put the engine together, put the tank on, carburetor was there, fire it up and only the rear cylinder works. giving it a little gas makes the front cylinder work as well, but there was a lot of back firing and at idle the front cylinder wouldn't work. Did a compression test on both cylinders and result was around 130psi for both. Spark plugs spark. Engine is stock, bike has 5700 miles (yes five thousands) is a 1988 80ci. Carb is Mikuni HSR 42, Exhaust is hard krome or something like that.. Bike was running fine before the job, just had very bad leakage from the rocker covers and front head. Where should I look?? Brother thinks we might have inverted the pushrods, I doubt it, but would some like this happen with inverted pushrods??