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| Motor not running right... http://mudmotortalk.com/mmt_v2/viewtopic.php?f=3&t=31244 |
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| Author: | Barroll [ Sun Aug 05, 2012 9:23 am ] |
| Post subject: | Motor not running right... |
So the last time I took my boat out, it did not want do idle well and it would shut off. Its a 35 with IM heads and single mikuni. It would also sputter when going from an idle to WOT. A few days later when I cranked it up it would rev up on its own to about 2200rpms, then drop back down and shut itself off. When I hit the throttle, the response is good but it doesnt drop back down in rpm's like it should, it slowly drops, then may go back up. I figured it was bad gas or a gummed up carb. So I took the carb off and cleaned out the bowl with carb cleaner and sprayed what I could from the outside. I did not take the carb completely apart. I also replaced the gas and added seafoam. After this it is still doing this. I have also tried turning the air mixture screw all the way in to 3 turns out with no help. So any help or advice would be appreciated. |
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| Author: | MeatWagon [ Sun Aug 05, 2012 9:41 am ] |
| Post subject: | Re: Motor not running right... |
it sounds like you have a vacuum leak somewhere |
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| Author: | Barroll [ Sun Aug 05, 2012 9:47 am ] |
| Post subject: | Re: Motor not running right... |
| Author: | cb5331 [ Sun Aug 05, 2012 10:47 am ] |
| Post subject: | Re: Motor not running right... |
Spray carb cleaner around the head/intake, intake/adapter, adapter/carb. See if it changes the way the motor runs. If it does, you have an intake leak. Those can all be symptoms of that. |
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| Author: | OwenDickeson [ Sun Aug 05, 2012 12:12 pm ] |
| Post subject: | Motor not running right... |
Turning the idle mixture screw out is just letting more air in. |
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| Author: | MeatWagon [ Sun Aug 05, 2012 12:16 pm ] |
| Post subject: | Re: Motor not running right... |
[quote="cb5331"]Spray carb cleaner around the head/intake, intake/adapter, adapter/carb. See if it changes the way the motor runs. If it does, you have an intake leak. Those can all be symptoms of that.[/quot it will let you know real quick |
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| Author: | Barroll [ Sun Aug 05, 2012 1:24 pm ] |
| Post subject: | Re: Motor not running right... |
| Author: | Barroll [ Sun Aug 05, 2012 1:27 pm ] |
| Post subject: | Re: Motor not running right... |
| Author: | OwenDickeson [ Sun Aug 05, 2012 2:19 pm ] |
| Post subject: | Motor not running right... |
That's fine. People that say theirs run best under 1 turn out have too small of a pilot jet. Per the mikuni tuning manual. |
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| Author: | OwenDickeson [ Sun Aug 05, 2012 6:25 pm ] |
| Post subject: | Motor not running right... |
Did you make any adjustments to anything before it started acting up? |
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| Author: | Barroll [ Mon Aug 06, 2012 6:25 am ] |
| Post subject: | Re: Motor not running right... |
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