- Posted by saltydog73 on July 17, 2003 at 19:09:31
I have a 1984 70 hp Evinrude that, under load, idles great at all RPMs and in gear until around 2000 RPMs. It runs in gear at higher RPMs (5000) great for first 5-10 minutes and then it bogs down. Compression on all three cylinders is 120, fuel tank is clean, new hoses and fittings from tank to carbs, rebuilt carbs, new fuel pump, new spark plugs, new rings on the pistons (one piston wall was scarred up – the compression was 120 after the new rings). Second trial… same result. The carbs were taken apart and cleaned again. Second trial… same result. Any suggestions?
Follow Ups:
- Re: 70hp Evinrude bogs down - saltydog73 05:05:04 07/23/03
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- In Reply to: 70hp Evinrude bogs down posted by saltydog73 on July 17, 2003 at 19:09:31:
The motor is running now! Thanks for all of your suggestions. It turned out that there is a steel bolt (not stainless) near the high power jets in the carb that had rust on it. After a few minutes at high RPMs, the rust would clog the carb ports. It was cleaned and the timing adjusted and I am back on the water. Thanks
- Re: 70hp Evinrude bogs down - saltydog73 15:02:46 07/18/03
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- In Reply to: 70hp Evinrude bogs down posted by saltydog73 on July 17, 2003 at 19:09:31:
I checked the overheat alarm and it works fine so I do not believe that it is overheating. Called the boat shop and the said that I should be using a 50:1 fuel mix which is what I have been using. I have seen some similar posts that suggest examining the power packs, ignition coil, timing, and synchronization. Should I be concerned with any of these? Thanks
- Re: 70hp Evinrude bogs down - youngjimhawkins 07:24:02 07/18/03
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- In Reply to: 70hp Evinrude bogs down posted by saltydog73 on July 17, 2003 at 19:09:31:
Are you running the proper fuel mixture?
- Re: 70hp Evinrude bogs down - saltydog73 08:46:51 07/18/03
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- In Reply to: Re: 70hp Evinrude bogs down posted by youngjimhawkins on July 18, 2003 at 07:24:02:
Yes, I am fairly certian that I am running the proper fuel mixture. I will contact Evinrude to make sure.
- Re: 70hp Evinrude bogs down - saltydog73 08:46:51 07/18/03
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- Re: 70hp Evinrude bogs down - machnumber2 22:13:55 07/17/03
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- In Reply to: 70hp Evinrude bogs down posted by saltydog73 on July 17, 2003 at 19:09:31:
is water coming out of the peehole, could it be overheating and starting to seize?
- Re: 70hp Evinrude bogs down - saltydog73 04:15:23 07/18/03
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- In Reply to: Re: 70hp Evinrude bogs down posted by machnumber2 on July 17, 2003 at 22:13:55:
Yes, water is coming out of the pee hole. I haven't checked to see how hot it is after it warms up but the volume of water coming out does not change.
- Re: 70hp Evinrude bogs down - Tailgunner 09:29:45 07/19/03
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- In Reply to: Re: 70hp Evinrude bogs down posted by saltydog73 on July 18, 2003 at 04:15:23:
Saltydog, You may want to go to www.maxrules.com and post your question there. You might be having timing advance problems, due to worn advance plates etc. I'm sure someone there can help. Tailgunner
- Re: 70hp Evinrude bogs down - Tailgunner 09:29:45 07/19/03
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- Re: 70hp Evinrude bogs down - saltydog73 04:15:23 07/18/03
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