Rear pipe extremelly hot

[fxrrider]

I have an 81 engine I just put on my bilke after blowing my front cylinder apart on my other one. Here is the story the engine was on display in a dealership for years, and was rebuilt before being put on display many years ago. I bought it had points, so I took them out and put my Dyna 2000I in but I could not get my status lights to light,so I put my original HD electronic ignition in. I set the ignition up by the manual to retard mode to get it started,my plate was pretty close to full advance, got it started and tried to time it with a light, could not find the timing mark.My rear pipe was getting hot and bluing, so I took intake boots apart and made sure there were no leaks, then checked seal on rear exhaust, then pushrods for adjustment, the rear intake was slightly to tight.Pulled the plugs (plugs were sooty black so lean doesnt appear to be problem) and reset timing and tried again to time it again no luck but again my rear pipe is getting very hot. Any ideas? why can I not find my timing mark? I painted the line white the only time I saw that mark was when the rpm's were below 2000. I have gone from one end of adjustment to the other on ignition plate with no luck. This is taking forever cause I only let the bike run for less than 10 min and then let it cool down for a hour before retrying. And my pipe is smoking hot in that time, the front is hot but no where as hot as rear

[76shuvlinoff]

Are all your timing marks lined up, including the marks on the cam and pinion with the front cylinder on the top of the compression stroke? I am not a builder or tuner and probably asking the question wrong but it sounds to me like you are way the hell out on timing. I was gonna ask about pushrods but you said you've been through those. 

Mark

[fxrrider]

I may have to open it up and check the cam timing marks.it is confusing cause the flywheel timing marks are the early 80's style with the low dot and the line but according to the numbers on the case it is a 81 engine so it should have the high dot, the line and the laying down 8 for rear cylinder timing. The guy I bought it from was selling the old Robinson harley dealership stock, and that is where it was on display at. What I have heard they were the best engine builders of the time, they did alot of work on the daytona racing harleys in the day, so I would hope the cam is lined up properly