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Engine runs normal until taken off choke then runs very fast
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<blockquote data-quote="turbotodd" data-source="post: 277979" data-attributes="member: 7376"><p>I was afraid it'd be a C25. I hated those things!! Still do. It's a 25 HP and luckily the C25's had the exact same powerhead as the C30 did (498cc, IIRC)...so I assume it'd be possible to swap the carb and maybe the exhaust tuner, and you'd have a 30. I have never attempted it. Most people that had problems with a C25 chunked them and either got a 25 triple or a twin carb 25. I did have the misfortune of having to clean a carb on a C25 about 2 months ago. Got it running in the tank and forgot how badly they idle compared to a triple 25 or a twin carb 25. I kept fooling with it to get it to idle....then opened up the Marine spec book (the Yamaha book) and read the specs: Idle speed 1000-1100 RPM. Timing 0° BTDC. Set it at that and sent it home. Couldn't get it to idle much lower anyway, not without it dieing.</p><p></p><p>Gettign the carb off isn't impossible but it's not nearly as easy as a twin carb 25.</p><p></p><p>The kits are everywhere. Yamaha has an excellent one.</p></blockquote><p></p>
[QUOTE="turbotodd, post: 277979, member: 7376"] I was afraid it'd be a C25. I hated those things!! Still do. It's a 25 HP and luckily the C25's had the exact same powerhead as the C30 did (498cc, IIRC)...so I assume it'd be possible to swap the carb and maybe the exhaust tuner, and you'd have a 30. I have never attempted it. Most people that had problems with a C25 chunked them and either got a 25 triple or a twin carb 25. I did have the misfortune of having to clean a carb on a C25 about 2 months ago. Got it running in the tank and forgot how badly they idle compared to a triple 25 or a twin carb 25. I kept fooling with it to get it to idle....then opened up the Marine spec book (the Yamaha book) and read the specs: Idle speed 1000-1100 RPM. Timing 0° BTDC. Set it at that and sent it home. Couldn't get it to idle much lower anyway, not without it dieing. Gettign the carb off isn't impossible but it's not nearly as easy as a twin carb 25. The kits are everywhere. Yamaha has an excellent one. [/QUOTE]
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Engine runs normal until taken off choke then runs very fast
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