RE: Help... with Irvine engines
The word on the street is that Irvine was bought by OS and production of engines moved to China. Small Qtys of 15s may be made in the UK to special order.
The rumour mill says that only the 39 to 53 models will be produced and the 25 will be dropped. This created a problem in the UK as some racing classes used the 25.
There is a suggestion that the larger models may use OS style innards and carbs.