1998 pro max - issues

**Blown Up** · 07-06-2020, 12:57 PM

1998 300 pro max.

Motor has run fine all year. Idled out from launch for about 10 mins. Get on plane and within about 1/4 mile the motor just shut off like someone turned the key off. I have checked all connections and can't find anything loose. Have power from key ignition to the motor. Starter will engage but will not turn the fly wheel. I cannot turn the fly wheel by hand or with a socket wrench. Pretty sure I am guessing this is not good....but thought I would see if there are any suggestions anyone has before I dig any further into this.

Thanks

**roadkill636** · 07-06-2020, 02:12 PM

Pull out all 6 spark plugs. Remove the flywheel cover. Try turning again. Post results

**roadkill636** · 07-06-2020, 02:18 PM

Next. Drop the lower and and see if the flywheel spins. Mite have locked up the LU gears.

**Merc 2.5** · 07-06-2020, 04:04 PM

I agree both good advice , u should had heard sumthin if it motor , lots time its lower unit, I'd pull it off 1st

**Euroski** · 07-06-2020, 05:17 PM

When U pull the plugs see what they look like. Post photo of them all.

**Blown Up** · 07-07-2020, 10:59 AM

I did pull all 6 plugs when returned and flywheel still did not spin. All plugs had perfect coloring as they should.
I will drop the lower and see what happens from there. I'll be back with results once I get it dropped.
Thanks again for all suggestions.

**bullet123** · 07-07-2020, 02:24 PM

hopefully its a locked lower. fingers crossed

**Blown Up** · 07-08-2020, 09:32 AM

Thank you all for the help. Pulled the lower last night and it is indeed locked up.

**Merc 2.5** · 07-08-2020, 04:02 PM

U can start ur motor for a sec without lower unit and make sure it's all good also

**roadkill636** · 07-08-2020, 04:43 PM

Originally Posted by Blown Up

Thank you all for the help. Pulled the lower last night and it is indeed locked up.

Lower unit locked? Or powerhead locked?

**Blown Up** · 07-09-2020, 08:48 AM

Lower unit is locked up. Good thing is I had them rebuilt less than a year ago, so everything is still under warranty. I know it is not good, but I am actually glad to have it be the lower unit and not the powerhead.