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Forum: General Q & A

06-24-2014, 02:53 PM

Replies: 19

New GM 502 Vibration above 1500 RPM

Views: 5,080

Posted By Mad River

Thanks for all your help. John from 800 runs new...

Thanks for all your help. John from 800 runs new gave me some things to try. He did say that the motor I bought has all GM forged internals and is spin tested before it ships. I plan to check for...

Forum: General Q & A

06-23-2014, 06:19 PM

Replies: 19

New GM 502 Vibration above 1500 RPM

Views: 5,080

Posted By Mad River

The flywheel dowel pin came on the engine, so I...

The flywheel dowel pin came on the engine, so I know that's not it. 800 Runs new is telling me to do a compression test. Then if that's OK swap carb. Thanks for all the responses, although I have to...

Forum: General Q & A

06-23-2014, 04:02 PM

Replies: 19

New GM 502 Vibration above 1500 RPM

Views: 5,080

Posted By Mad River

New GM 502 Vibration above 1500 RPM

I purchased a new GM 502 marine base engine from 800 runs new for my 29 Fountain. I installed it and get a bad vibration over 1500 RPM. So far: Changed Flywheel from Summit to one provided by 800...

Forum: General Q & A

06-19-2012, 06:26 AM

Replies: 15

MCM525SC Cutting out

Views: 1,868

Posted By Mad River

I took her out with a timing light hanging off #1...

I took her out with a timing light hanging off #1 and when she stumbled and quit, the light was still flashing. Cranked her over and the light still showed I had spark. So it must be fuel. Before I...

Forum: General Q & A

06-18-2012, 07:49 AM

Replies: 15

MCM525SC Cutting out

Views: 1,868

Posted By Mad River

Hi - Finally got the chance to run the test. I...

Hi -
Finally got the chance to run the test. I have spark, ignition checks OK so it must be fuel. Before I went out, I changed the fuel filter. Dumped the fuel from the old one in a glass jar and...

Forum: General Q & A

06-10-2012, 12:04 PM

Replies: 15

MCM525SC Cutting out

Views: 1,868

Posted By Mad River

Thank you. I will take this out and follow the...

Thank you. I will take this out and follow the chart.

Forum: General Q & A

06-10-2012, 06:33 AM

Replies: 15

MCM525SC Cutting out

Views: 1,868

Posted By Mad River

I replaced the ignition sessor. It was badly...

I replaced the ignition sessor. It was badly corroded, however, I am still having the same problem. Ran fine for 15 to 20 mins...slowly cut out, then after 30 minutes started and ran at low speed...

Forum: General Q & A

06-08-2012, 01:39 PM

Replies: 15

MCM525SC Cutting out

Views: 1,868

Posted By Mad River

Thanks for the response!! I was thinking it is...

Thanks for the response!! I was thinking it is ignition related. I will replace the sensor.

Forum: General Q & A

06-08-2012, 12:21 PM

Replies: 15

MCM525SC Cutting out

Views: 1,868

Posted By Mad River

I am going to install a fuel gauge tonight. I...

I am going to install a fuel gauge tonight. I don't run WOT for any more than a few minutes. What I meant was the boat runs strong for 20 mins. If I run at 1200 RPM, she does not die. But that's not...

Forum: General Q & A

06-08-2012, 11:07 AM

Replies: 15

MCM525SC Cutting out

Views: 1,868

Posted By Mad River

MCM525SC Cutting out

Maybe someone has had this problem: My Merc 525SC (Gen IV block, roller, Weiand 177, 1050 Dominator, Thunderbolt IV) will run great (WOT at 5200) for 15 or 20 minutes. Then it cuts out. It's not...

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