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    98 Mercury 150 running issue

    Came back for an update, boat sat for a while when it couldn't be worked on. i replaced all carb hoses, took it out and it seems as if I've found something. Idles great and gets up on plane great it just has a small 1-3 second hiccup right at that 1800 rpm mark still. I'm not going to quit until...
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    98 Mercury 150 running issue

    Prop pitch I’m not 100% sure on. It came off of the exact boat that it is on now, a nitro fish and ski hull 18.5 ft. First 15 times out it performed great so I’m not sure if that’s something that would happen all of a sudden. I have a Z shaped hose running to the bottom of the block, then out...
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    150 EFI ongoing issue

    Any update? i have an almost identical problem occuring
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    98 Mercury 150 running issue

    Chris , doubled checked timing and made sure carbs were synced correctly. Just took it out and same deal. Not much left on this darn thing. I'm going to go over everything once again later today and if I have time, I'll try to get it back to the lake to get a video. Might give a better idea. PS...
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    98 Mercury 150 running issue

    Adjusted mixture a bit to no avail. Went as far as richening up all until motor died and slowly coming back in with all until i had a decent idle again. Nothing improved. Played with them a bit more but to no avail. As far as the reeds go i have no idea. I repowered with this motor a few months...
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    98 Mercury 150 running issue

    It affects the top two port cylinders, so potentially two carbs, but only one barrel each. So finally got back around to working on the boat. After going through everything again I noticed I wired one switch box incorrectly so firing order was off. This was why I had the 2 black plugs . It...
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    98 Mercury 150 running issue

    Chris, New gaskets when going back on, made sure everything was seating properly. Nothing was loose..
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    98 Mercury 150 running issue

    None at all
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    98 Mercury 150 running issue

    Compression test last night showed all cylinders between 120-122.. using an spark tester during idle all coils were firing and open air tester showed plugs sparking good
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    98 Mercury 150 running issue

    I will run through all of that to double check. Thank you for the input
  11. D

    98 Mercury 150 running issue

    So the boat has been at the mechanic for a few weeks for loss of power at 1800 rpm and a bad idle. Found chipped reeds, replaced with Carson reeds and added spacer plate. Idles fine now on muffs and in tank but once on the water it still doesn’t want to go after being in gear. All electrical has...
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    98 xr6 150 backfire issue.

    Yes
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    98 xr6 150 backfire issue.

    I am going to double check wiring on both switch boxes after work today..
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    98 xr6 150 backfire issue.

    Short video of idle
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    98 xr6 150 backfire issue.

    Over the weekend boat ran great all day on the water. Started it to bring it back to the launch and it wouldn’t run past 1800 rpm. If it happened to feather over 2k it would run great again up to 5500 rpm. Tested compression all are 115-120, getting good spark , all fuel system has been replaced...
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