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mattie260 1998 15hp

Re: mattie260

Need to back up here a sec.

The last Yamaha built 15 horse Mariner hit the stores in 1992. So either you have the year wrong or you have a Merc/Mariner.

So if you are talking about an actual "head" and not a water jacket cover, it's the year that's incorrect.

The Yami/Mariners had 11 bolts on the cylinder head with the following sequence

8, 9
4, 5
3, 1, 2
7, 6
11, 10

that are tightened in two stages.

First round, tighten to 5.8 foot pounds in order
Second round, tighten to 12 foot pounds in order
 
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