The twist grip on the 79 15hp I recently bought wont rotate to full throttle. Read that if someone tilts the tiller handle way up and twists the throttle that the synchronizing gears can get out of mesh. If this is what the problem likely is, how do I go about correcting it?<br /><br />Also, in manuals for this series of outboard, who makes a good one? Other than a original Evinrude manual, from what I can see the choices are Seloc and Clymers.
<br /><br />Don't know much about the motors history but its a super clean 1979 Evinrude 15hp two stroke S.shaft with electric start. <br /><br />Motor started fine and ran well on the hose flusher but would not throttle up much past a fast idle, also found out during closer inspection that the lower cylinder plug hole was almost completely stripped. Lower unit lube was dark & overdue for a change but no sign of water contamination.<br /><br />I took the motor anyway as it appears to have been used very little and looks almost new despite being 25 years old. It sounds like I can have a machine shop install a helicoil and lock it in with red Loctite to fix the bad plug hole.