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    '89 100hp Merc 4cyl oil injection-runs on 2 cylinders

    Go to a national auto parts store and get a $10 spark gap tester and set it at 1/2". Test each plug wire to make sure spark is sufficient to jump the 1/2". That will eliminate the ignition system. Next, while it's running on less than all cylinders remove the carburetor cover and spray some...
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    '98 115 Yamaha runs hot if over 4,000 RPM's

    Late spring, I replaced the water pump, removed cylinder heads and exhaust cover and cleaned out all sediment (there wasn't much gunk in there), replaced poppett valve and checked thermostats. They both opened and closed at the correct temperature. Today, any time I got close to WOT, it would...
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    1988 GT 150 Revs to the moon upon start,

    Did this just start out of the blue? What have you recently done to the motor? I think we need a bit more info. I would have to assume your sucking in air somehow, but not sure where. When you say, "when you first crank it up......" Does that mean it eventually settles down and runs normally?
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    1986 90 hp johnson idle and ramp up issue

    I'd order carb kits and tear into the carbs. You'll need to order carb kits because there's a plug that you'll need to knock out to get to some passages that need to be cleared out. I've attached a diagram of your carbs. Pay specail attention to #3, #7, #13, and if you don't knock out plug...
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    Hopkins 4 pin tester

    I drive a Chevy Colorado and have had to replace my adapter box about every 2 years. Most auto parts stores actually have them in stock or you can buy from Amazon. I think the manufacturer is the same either way. There's a lot that goes on inside that box.
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    Carburetor's

    That makes good sense. So you move the controller to full throttle and then turn the motor with the starter only to check timing. Cool.
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    Sitting in a hotel room when I don't wanna... Hurricane Idalia

    We traveled to Atlanta when hurricaine Floyd was headed our way. Short notice of mandatory evacuation for all surrounding areas. Traffic was a disaster. It's 250 miles from my house to the hotel we were staying in. The drive took 23 hours!! Bumper-to-bumper traffic on the interstate the...
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    Carburetor's

    You guys actually crank up your motors and run the at WOT to check the timing? I've never had to do that before! On my Yamaha's and I think on some OMC's there are marks on the timing plate that you line up with other marks and simply put the control in WOT position and set the timing plate...
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    Sitting in a hotel room when I don't wanna... Hurricane Idalia

    I live in Savannah. I can't count the number of times we've evacuated, fought traffic, spent money that was for a nice vacation to go out of town for a few days, and then return to find I had a few extra pine cones in my front yard, but there was no real need to leave. So, we decided we...
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    Need a bit of help.

    Looks like the upper fires 1,5 and 3. If I'm following the wires correctly.
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    Rebuilt Carburetor… Still No Idle!

    The smallest outboards that I've ever done any real work on was a 25 HP Evinrude and an ancient 18 HP Evinrude. I guess I assumed that they were all similar to that. Recently, it's been mostly V-4's in OMC and Yamaha. That's a different animal I guess. I'm just trying to help here, but I'll...
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    86 Mercury 25XD Wont Run.

    If the plugs are wet, It's probably running too rich. When you say you've cleaned the carbs, did that include complete disassembly, soaking overnight in carb cleaner and after that blowing out all passages with compressed air? Some of those older carbs had brass floats that would develop small...
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    Starts smooth, then rough, dies

    Sorry, a lot of us here are old school 2 stroke carbed motor guys. No experience with 4 stroke fuel injected motors.
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    2005 90hp 2 stroke cdm wires are wrong?

    I have no idea what we're supposed to see in the picture. No connections are actually shown.
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    Shifter

    Good call flyingscott!! That motor has a lock that prevents tilting up in reverse, right? I bet if that locking mechanism is messed up, it's hindering shifting. You're the Sherlock Holmes of outboards!!
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    I cant get this throttle set up properly. Please advise.

    You say pickup timing is 5 degrees. Is that BTDC or ATDC? Idle timing on most outboards is actually After Top Dead Center. That would be 10 degrees difference in the travel of the timing base and throttle movement. Maybe that's the issue.
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    Rebuilt Carburetor… Still No Idle!

    JImmbo and everyone else here, I'm terribly sorry for my rude comment. It was way out of line and completely unnecessary. The timing and the cam that opens and closes the carburetors is linked together. So, timing advance and carbs opening happen simultaneously, so I understand what ya'll are...
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    1990 V4 runs on two cylinders at low RPMs

    Basically, if you bought a non-OEM carb kit, I'd put your old floats and needle and seats in and only use the gaskets in the carbs. Did you get the lead plugs back in there and dimpled to make them fit tightly?
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    1990 V4 runs on two cylinders at low RPMs

    I bought carb kits from Amazon a few weeks ago and had the exact same problem. Once I took them off and took the bowls off and compared the new parts with the ones I took off, I noticed that the needles were almost 1/8' shorter than the stock ones that I took out. You can test the needle/seat...
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    1990 90HP Pontoon, 4300 RPM at WOT, Do I need a new prop?

    Fantastic! Increase in RPM's and MPH's! I bet the kiddos love that! Can they "feel" the increase in speed? I'm surprised that nobody has marked that hazard in the lake! I live on the coast in Savannah Georgia. When we find a hazard, we call DNR and report it. Sometimes, we'll set up a...
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