I would use "a" again. It's a tiny word and not immediately obvious that you are omitting it because of basic repetition.
However, some other things:
In terms of motorcycles
You're selling more than one, I assume.
the forecast sale is expected
the forecast sales are expected
Your verb and subject need to both be plural or singular.
Also, although I'm not sure, aren't you talking about a "sales forecast", rather than "forecast sales"?
to experience an ascending trend
I would say "to trend upwards". The original phrasing feels a bit clumsy.
75k => $75k
I'm not so sure on the "k". I'm not saying it's incorrect; but I would only use this when speaking, not when writing. However, this can be accepted by whoever reads this report.
in the first two years
in the next 9 years
I would try to be consistent in whether you're using numbers or words ("two" versus "9"). The financial data can of course be expressed in numbers, but at least try to maintain consistency for smaller numbers that have no financial value attached.