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Do I need to get a plug for that hole?

Can anyone tell me what is missing from here. It is on port side of motor. Just noticed this few min ago. 87 mercury 150xr2 black max serial number 0B211154. 368640

Wasnt asking where to buy internet parts was asking for wire recommendations and part number. Dont have any local shops close by. so doing all work I can myself. But thanks.

No I have not never thought of that being an issue. But regardless i will tomorrow. tired of getting all oily every time I open cowling anyways. Thanks.

Can anyone recommend a set of plug wires with part number. Thanks

Ok done everything I've said. I've lync and sync rebuilt fuel pump new impeller run seafoam through fuel. Boat is still low on rpms 5500 and still only running 48mph. Boat is real sluggish out hole....

I've search internet and can't find anything that is in stone on a part number for plug wires. 87 mercury 150xr2 black max serial number in pic 368510

10 4 I got ya thanks.

368131 so at the red or the blue mark is where I'm looking for 8th gap?

Where in reference to this photo are u referring to getting the 8th in gap how do I increase the gap to get it there. Thanks in advance 368096

That's what book recommendation was. I will move it the next time I puddle with it. Probably tomorrow afternoon. I was told afterwards the 0-6 atdc is best. So ur 4 atdc is probably spot on. Thanks

Thanks for the info will do that probably tomorrow. So your pretty much setting primary timing by ear.

I did the link and sync adjusted timing got the throttle primary at 11° ATDC got max timing at 22° BTDC. Took the idle stabilizer completely off. It was three wires a red wire a black ground and a...

On TRAK I did the link and sync adjusted timing got the throttle primary at 11° ATDC got max timing at 22° BTDC. Took the idle stabilizer completely off. It was three wires a red wire a black ground...

Just an update. Deleted the idle stabilizer the red wire going into the back was broke in half and rotted. the timing was off on both ends was 6° at cranking and was about 19° at max. Rebuilt fuel...

Just an update. didnt get to work on boat today ended up spending 6 hrs doing a 30 min brake job on sons truck. Hopefully will get on it first thing in the morning

367576 here is pic of serial number. Sorry about that

I will it will be Monday before I go run it. Will have everything but the switch boxes done. If all that dont fix it then I will order the switch boxes. Thanks for everyone's help.

Ok thanks for the help. Yall have all giving me good input. gonna be a busy bee Sunday doing all this. Hope it all comes together. not looking for a rocket ship. But definitely looking for 55 plus...

I just recently purchased a 87 hydra sport with 87 150 xr2 Black Max. Boat is real sluggish out the whole and will only run 5400 wot. It has a 23p prop. All cylinders have good compression. New...

When you say remove any idle/spark advance. Are you saying permanently or just to get timing?

How did you test the switch box?

Thanks will do all that and let you know how she goes. I do have a manual Jack plate and started raising it a little. But had to go back down as prop was cavitating on launch.

2.1

Did it also increase your mph?