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97 Challenger Engine RPM/plane problem

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rgwekwert

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Hello,
I have a 97 Challenger single engine that I am having a hard time getting on plane. I was only getting about 5500 max RPM and it was taking forever to get on plane but when on plane it would get up to 6000 rpm.

I checked the plugs today and found them black and fouled and with a gap of .033 inches. (I have pictures, if interested).

I am using the plugs and gap as defined in the specs for this boat. I don't have the plugs in front of me to tell the exact numbers (BR8EX?) but they are the ones in the manual ...

I put new plugs in and set the gap to .021. The boat initially jumped out of the water and got up to 7000 rpm for only about 5 minutes then the RPM slowly died and maxed out at 5500. I took pictures of the plugs after the 5 minutes, if interested.

After that - I played with the plug gaps .021, .025, .033, ... but can not get the boat above 4500 rpm now.

I guess I am wondering if this is just a carburetor problem or is it still a plug problem. I just bought the boat this year so I don't have any idea if the carbs have ever been rebuilt.

I am fairly mechanically inclined but not sure I would do anything other than a minor screw adjustment on a carb. I did put a new solenoid on today and that solved my flaky starting problems.

Thanks in advance for any suggestions. Any suggestions would be greatly appreciated


Bobw - Sent from my iPad using Tapatalk
 
No worry, I'll move it. I'm not ignoring you, I just need to think about your problem, it's a strange one. If it's any help, the plug gap should be .021".

Lou
 
Need to read the plugs. Post pics of plugs and take a compression test. Plugs should be chocolate brown.
 
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