Snapped Bolt ... FIXED !!!

[stripminer]

OK,, in my efforts to be a better boat owner ( brought about by the fine folks here at V20.com ) I decided to change out my thermostats on my 1988 Yamaha 130 for the first time in 8 years.

Well,,,, as you can guess 7 of the 8 bolts came loose but good old number 8 snapped right off. *I am guessing that I need to drill out the old bolt and re-tap it. My question is,, do I need a larger diamter hole and then a larger diamter bolt ? When I tap the new hole will I have threads along its entire length ? ( the old bolt only has threads at the end )

Anyone with experience who is willing to give me an idea is greatly appreciated.

* * * * * * * * * * Thanks,
* * * * * * * * * * * * * Tom