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    '07 200hp Optimax, jack plate, water pressure gauge?

    Planning on installing a jack plate on 2101 Mako equipped with 200hp optimax. I think instead of going with the level gauge option on the jack plate, I'd rather go with a water pressure gauge so I know the engine is still getting water. I believe the small gray tube is already run up to the...
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    07 optimax - red plug in water line T leaking

    It's been in the shop a few times chasing down water pressure alarms and such. The little red plug that goes into the gray water line and Ts off into another water line is leaking. It is located at the bottom of the port side head. I know it's been removed to check pressure or whatever while it...
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    still messing with the looper - fuel pump?

    J120TLCOS - Recently found my WOT timing was off about 6 degrees. I set this up and did a test run about a month ago or so before it got too cold. That day I went out the engine seemed to run ok at WOT but slowing down then hitting the throttle again would cause an odd surge of power and cutting...
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    1985 looper - "Fast start" feature?

    I'm looking through my manual and don't see any information on this. Either I've overlooked it or I don't have this feature. Trying to check WOT timing by Joe Reeves style and I'm wondering if my engine has this. 1985 Johnson 120 - J120TLCOS Manual calls for 22*. Currently, WOT timing is...
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    no specification for idle timing - ballpark?

    1985 120hp V4 looper. My manual doesn't state a timing for idle just a WOT timing at 22 degrees. I'm trying to get a ballpark. I'm trying to idle her down in a make shift tank that submerges the gearcase just an inch or 2 above the cavitation plate. I'm unable to get it to idle less than 1700...
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    coils light up in the dark

    1989 pro50lf, still chasing what sounds like an intermittent electrical snap during operation. Runs fine at WOT and on plane but idle is poor and hesitant while throttling up. I just soaked the carbs for 3 days in dip, making sure the jets are clean and everything in place. I'm sure this isn't a...
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    vernatherms close all the way when cold?

    1985 120. Trying to test vernatherms. Don't have a thermometer right now but I never had a overheat problem. More of a rough smokey idle so I was thinking it might be running a little cold. Here's what I got. I took the port side vernatherm out and I couldn't blow air through it at all. I put it...
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    07/08 200hp Optimax - alarms, questions, long story

    Firstly, I posted on this probably back in June/July. Thought issue was fixed but wasn't until today. Engine only has 24 hours on it. Since breakin we've been getting alarms which the dealer said were related to water pressure. They installed a new water pump because the original was chewed up...
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    85 120, good high end, bad idle & dies

    Ok I need a little advice with my new to me looper. First a little history. Bought motor and installed on my little bass boat. All new fuel lines, fuel filter, carb kits with floats adjusted correctly, new fuel tanks, bulb, new spark plugs, and a freshly sealed gearcase. I've gone over the lync...
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    1985 Controls

    I took apart my controls and found the shift and throttle plate assembly and shift lever assembly to be damaged. The plastic teeth are sheered off and these 2 parts need to be replaced. My local dealer can find the shift lever assembly but not the throttle plate assembly (big round plastic...
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    loose steering bushing at clamp?

    Need a little help here please. I was installing my 85 120 johnson on my boat this weekend and noticed there is some play in the engine. The looseness appears to be in between the tube the steering cable goes into and the clamp that bolts to the transom. In other words, I can lift up on the skeg...
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    1985 120hp cracked bowls

    I have found 2 bowls cracked around where the needle valve seat screws in. I think the best thing is to replace all 4. I don't know if I cracked them or if they were already cracked and I didn't see the hairlines when I rebuilt them because of lighting conditions. Questions is, are there any...
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    VRO already removed when I got it, won't idle

    VRO has been removed and it has fuel pump 438559 on it. From what I read this is not enough fuel for wide open throttle. Yet I have an interesting problem. I just rebuilt all 4 plastic carb bodies, all new fuel line, float levels set per spec, jets all clean, etc. I can only get the engine to...
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    won't go into gear - fixed

    Had another post going here on soaking carbs. I got them rebuilt with all new fuel line, and installed a water pump kit yesterday. The donor boat I have the motor on still has bad cables. I'm assuming the shift cable is broke from someone trying to force the lower unit into gear. When I took...
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    manual says not to soak carbs

    1985 Johnson 120hp, manual says not to hot tank or soak carbs in solvent. I've always soaked my yamaha carbs overnight, and the sticky in this forum says to do so as well. Do I just soak them overnight and never mind with the manual?
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    I'm about to over power my boat with a Johnson.

    I didn't really want to start a thread like this but I feel it's the only way to get responses from people that may have experience in the matter. First off, I have read a few threads about people not recommending the overpower due to insurance, safety, liability, etc. With that aside, I don't...
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    won't turn over - cylinder 3 full of gas

    1989 Pro 50. At the lake this weekend and had this problem. The only time I've seen it do something like this is before I removed the oil injection system. It actually had cylinder #3 completely full of 2 stroke oil. I didn't know this had happened and tried turning it over. Now I think that's...
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    yamaha to johnson swap

    I'm sick of the yamaha and I found a good deal on an older 1976 Johnson 115 with power tilt/trim. The yamaha is a 1989 Pro 50 with power tilt trim. I am being provided with controls that are supposed to be in good working condition, however, if something is messed up with them I'll just get...
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    89 Pro 50hp to 70hp?

    Would a 70hp powerhead bolt up to my existing 50hp platform?
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    '07/08 Optimax 200hp constant alarm -SOLVED

    I was on vacation for 9 days and had to deal with this on a brand new boat (last 08 model). Luckily I was able to work around it without hurting the engine, but it's in the dealer who is covered by 30 boats (or so they say) at the moment so it looks like it might be awhile. Here's how it goes...
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