Instruct: Classify a given review as either positive or negative.
Query: I didn't find this helpful

I'm very sorry to be negative but I did not like this book. I found that this book muddied the waters regarding two stroke engine operation more than providing any helpful insights. In my opinion Bell's book is a better practical guide, and Blair's book is the best of all for someone who wants to understand the processes involved in two stroke engine operation and then apply them.