Irvine Engines

The original Irvine 53 was a hard act to follow, but needless to say, the new Irvine 53 ABC MkII is more than up to the task.
The new engine shares the same crankcase dimensions as its predecessors and the new 40 and 46 MkIV stablemates, so you can be sure that fitment is not an issue.

The MkII version of the popular Irvine 150 shares the same design criteria as its predecessor by offering solid performance in a compact package, but takes the concept a step further by optimising the crankcase gas passages to ensure maximum power, yet retain a high gas flow for improved throttle response