From MGP website:-


Post Classic Eligibility Regulations

There has been a certain amount of speculation regarding these regulations so I am taking this opportunity to clarify the situation and explain the thinking of the Manx Motor Cycle Club in making the decisions that were made.

The first problem was “Where can we put an extra race?” At our meeting last Grand Prix week with the club’s ambassadors, there was almost total agreement that the Newcomers race should not be dropped even though numbers of competitors had fallen over the years. None of the other races could be dropped and trying to fit another race into the programme was not possible bearing in mind the cancellations that bedevilled last year’s event. We cannot have a race on the Saturday because of the loss of valuable practice time and the Manx Two Day trial so the only answer was to run it at the same time as the Newcomers race. Although there has always been a lot of interest in a Post Classic race, we do not know how many competitors will actually enter, especially with the current economic climate, so we thought that a full grid for the first race of the week was better than running two separate races with limited numbers in a programme that would create so many problems for all concerned should there be any postponements..

The second problem was “What should the regulations be for the Post Classic machines?” I am the Chief Technical Official for the Manx Grand Prix but I am not an Eligibility Officer for Classic machines. The only time we see Classic machines on the Isle of Man is on the Southern 100 circuit and at the Grand Prix so I have to lean heavily on people with the necessary knowledge as far as eligibility is concerned. The Classic regulations have been refined and modified over 25years, with the Post Classics we were starting from scratch so I consulted one of our ambassadors who is very knowledgeable for the eras that we were looking at. Yes, I only consulted one person because I have found out that as far as regulations go, you cannot please all the people, all of the time and the larger the group, the more diverse the opinions become. So my brief to the ambassador was to have two classes, two stroke and four stroke with as few regulations as possible to make it easy as possible to enter and race but bearing in mind that the machines would be sharing the course with Newcomers.

Please remember that this is the first year for the Post Classics and it may be that I have got it wrong but we needed a starting point and these regulations have been used in order to get as many machines on the grid as possible and to make the race the spectacle it deserves to be. For next year, we may have to modify the criteria but until we have tried it, we do not know how things will pan out.

I have made two important changes

The requirement for standard ignition systems on the two strokes was not a good idea and has been removed.
The cut off date for 500cc two strokes has been changed to 31st December 1982.
One final clarification is that modified road machines will be considered for the 126-250cc class with the cut off dates 1st January 1985 - 31st December 1991 but priority will be given to genuine racing machines.

Jeff Kirby. Chief Technical Officer.

POST CLASSIC ELIGIBILITY
Four Stroke
501-1000cc 2 valves per cylinder, cut off date 31st December 1981.

Two stroke
126-250cc Grand Prix Factory Bikes Steel frame or period aluminium frame, any brakes, any wheels, cut off date 31st December 1984.

126-250cc. Standard frames, Standard fairing, no airboxes. Any brakes. Cut off dates 1st January 1985 - 31st December 1991.

251-350cc Steel frame, any brakes, any wheels. Cut off date 31st December 1984.

351-500cc Two stroke up to 31st December 1982, Steel frame, any brakes, period fairing.