Merc in-line. Shouldn't it pull past 5k on a mx-15?

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Originally Posted by WillDiver

my 17' Kona, with a '78 1500 turns about 5200 at 48 MPH running a 19" prop. I need a carb job, and a link n sync, then I expect 5500 and just barely north of 50. The trigger can sometimes go wonky on those. CDI has a website (I dont recall the link) that gives troubleshooting instructions for the trigger.

Will

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I know this is kind of hijacking this thread, but... You need to get the 1500 spinning higher! Those low rpms on those motors will kill them faster than a little over-revving. That thing should be turning 5800-6000 all day long!

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Originally Posted by croSSed

I know this is kind of hijacking this thread, but... You need to get the 1500 spinning higher! Those low rpms on those motors will kill them faster than a little over-revving. That thing should be turning 5800-6000 all day long!

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Yeah, I just got the boat a few months ago, and havent been on the water too much yet. I figure going from a 3 blade 19" to a four blade 17 or 19 will help with that. also I really need to tear into the carbs....and pretty much replace the entire fuel system. Luckily, its all easy stuff, as long as I can find the right parts.

Will

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Originally Posted by milkdud

Post the serial number off the motor and we/I will tell you. If its falling that flat at 5100RPM, then I can almost guess its a 90. Can you also post a picture of the motor?

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Ok - the number on the clamp says its a '78 90HP... but we know the powerhead was changed before we got it 24 years ago. The only number that could be found on the block is 8526627

852xxx is a casting number, won't help.

Is there a freeze plug on the starter side near the intake covers? Many were set stamped on that plug. Check the distributor arm.

Im guessing its a 90.

On mine it looks like this. Starboard side.
Attachment 323573

Will

WillDiver. FYI I think that P at the end of the Serial Number is a Pace Maker block. Factory rebuilt back in the day.

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Originally Posted by milkdud

WillDiver. FYI I think that P at the end of the Serial Number is a Pace Maker block. Factory rebuilt back in the day.

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Yeah, Ive been told that. The serial number on mine isnt on the transom clamp anymore, so I had to do some looking around. The decals are all for an earlier 1150, but when I looked up the block, its a 78 1500. and also verified via the carbs (WMK-22) and a few other unique items. it was an interesting investigation.

I just ordered my carb rebuild kits, new floats, and fuel pump kit. guess I'm gonna play a little bit.

Will