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<blockquote data-quote="DerHornen" data-source="post: 224491" data-attributes="member: 672"><p>Sounds like you were the unlucky one that got the lemon. It's pretty sad that Yamaha never released any technical service bulletins or did anything of substance to help those that had the most trouble. Most of the info I found on the net about the mystery filters originated from savvy marine mechanics that really dug into the problems and figured it out on their own. Even more disappointing is that those same mechanics couldn't get replacement filters from Yamaha, they somehow figured out how to order them elsewhere. I think I found the info at thehulltruth.com</p><p></p><p>I think the Optimax is actually classified as a low pressure direct injection. The end result is fairly similar but the supporting systems are very different. Opti's can be great motors too, but it's approaching Chevy vs. Ford in some respects. Opti's weren't flawless either, especially the earlier big block models. Some was user error with pounding the throttle before they were warmed up, but some was definitely the product. Before they got a reputation as a reliable motor with great power to weight ratio they were known as Opti-pops because of how many blew up powerheads. It seems like they nailed it with all HP ranges after around 2003, but they were all still loud as hell. The coils had persistently aggravating failure rates until at least 2008.</p></blockquote><p></p>
[QUOTE="DerHornen, post: 224491, member: 672"] Sounds like you were the unlucky one that got the lemon. It's pretty sad that Yamaha never released any technical service bulletins or did anything of substance to help those that had the most trouble. Most of the info I found on the net about the mystery filters originated from savvy marine mechanics that really dug into the problems and figured it out on their own. Even more disappointing is that those same mechanics couldn't get replacement filters from Yamaha, they somehow figured out how to order them elsewhere. I think I found the info at thehulltruth.com I think the Optimax is actually classified as a low pressure direct injection. The end result is fairly similar but the supporting systems are very different. Opti's can be great motors too, but it's approaching Chevy vs. Ford in some respects. Opti's weren't flawless either, especially the earlier big block models. Some was user error with pounding the throttle before they were warmed up, but some was definitely the product. Before they got a reputation as a reliable motor with great power to weight ratio they were known as Opti-pops because of how many blew up powerheads. It seems like they nailed it with all HP ranges after around 2003, but they were all still loud as hell. The coils had persistently aggravating failure rates until at least 2008. [/QUOTE]
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