http://www.selvamarine.co.uk/infopage.asp?infoid=153
Selva's 'Service Literature' manuals may be useful. If they have the spares list, they should contain an exploded diagram, which may help you...
I had a selva naxos, kept it for about a week, I hated it!! It was quite a good runner, but it was just really crude, and basic!!
I found as soon as you mentioned selva, outboard mechanics didnt want to know...
It needed a few parts, dealers were hard to find, I contacted selva, and they were helpful.