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    Vibrating at low rpm

    Let me ask you this? What would cause the engine to vibrate at low rpm on certain props? I'm propped right now but I have a GT 150 on a 17 foot deep v runabout and after finally getting it propped right I was wondering, I tried a 18 pitch turbo prop and at idle threw the no wake zone I'd get a...
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    Does this sound right?

    After several posts trying to prop my boat right I've ended up with a Michigan stainless 19 pitch prop on my 87 gt 150 Johnson that is on a 17 foot Fabuglas runabout. I'm getting now 5600 rpm and 51 mph on GPS with my wife and I, 30 gallons of fuel and fishing gear and cooler. I'm going to say...
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    Turbo prop

    Hello again, I just bought a turbo prop off eBay and was wondering if my thrust washer off my raker prop would work for the turbo or do I need to order a special one for it. Thanks in advance. Chris
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    1987 Gt 150 carborator adj.

    I been fighting trying to get good rpm at wot with my engine. I been to prop section tried going from 22 pitch down to 19 and still only pulling 5200 at wot on a 17 foot runabout. I just checked tonight the carburetors and when I engaged the throttle all the way I went back and I still could...
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    Is 1987 Gt 150 running right

    Hello again, After switching from force to Johnson I must be a little paranoid. I'm running a 17 foot Fabuglas open bow and the Johnson I put on had a 22 pitch stainless prop, I could only gain about 4800 rpm at wot with it, so I went down to a 19 pitch alum. prop and with little gas got 5200...
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    which prop 19 or 22?

    Hello fellow boaters, I just bought a 87 GT 150 for my 17 foot v hull ski boat. My question is this. On the 22 pitch stainless I was getting around 58 mph at 4800 rpm. Now on the 19 pitch alum. I'm getting about 50 mph at 5200 rpm. Which is better the 4800 or the 5200 or would anyone recommend a...
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    oil leaking down midsection

    I bought a GT 150 1989 and Had a mechanic put it on, replaced the powerpack and it runs great. Anyway, We took it out for the first time Last night and when I tilted the engine up for travel I got home and we noticed some oil running down the back of the midsection. Not directly in back but off...
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    89 150 hitting on only 3 cyl.

    I just bought a Johnson gt 150, took it to the shop Friday to get put on and the head mechanic wasn't going to be there till today to run it and found out in is not hitting on 3 cyl. Its got great compression he said. I bought it last Thurs. night and the man ran it for me and it sounded great...
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    re-power force to Johnso

    AAAAAhhhhhhh it is nice to be over here instead of the Force section. I just bought a Johnson GT 150 to replace my force 125. It's a 89 with all controls and wiring. Is this a Job I can do myself and do it right. I don't have any experiance with this. The only thing I know I can do is get the GT...
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    Force 1987 125 cuts out at wot

    After switching power heads with Franks input this past winter on my 125 I finally got it out today to run it. It starts fine and idles great, I took it on the channel and ran it wot and in about 1/8 of a mile it just started missing real bad. Not miss,miss,miss but like you turned the key off...
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    Keel repair

    I bought this boat last month and I noticed today that there was a couple drips on the keel under the gas tank compartment. It is a Fabuglas boat. Crawling under it I noticed cracking were the drips were and forward the keel is down to the fiberglass. I am going to purchase a keel guard and I...
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    Changing power head update

    Frank, if your still out there, I got my powerhead and all looks good. It has everything on it including the exhaust tube. I got a CD off eBay but can't fallow it well so I ordered a Clymer off eBay and will wait for it to get here, I'm just trying to get up the guts to tackle this job. Also, I...
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    Changing powerheads

    Hello again, I was on earlier this month about a bad piston on my 1987 force 125. I pulled the head and sure enough the piston was melted and a penny size hole melted out of it. The wall is scared bad. I have purchased a used power-head with everything on it entire top end is coming. My question...
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    1987 force bad cylinder

    Hello fellas, I just bought a boat with a force engine and when I got it home 1-3-4 pistons had 125 compression, 2 had 0, was loose. I ran the boat at 4000 rpm wot on plane before compression checking. I guess my question is how big a job is it to tear into it and replace that piston? Is it...
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    tach problems

    I have a 140 horse evinrude and was doing a tune up and noticed a bad wire on the rectifier, I got a new one, changed all the leads on the cables to the battery. Before I did this my tach would go crazy while on plane, jump from 4500 to 6000 exc exc. And when I turned on the lights it would quit...
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    Compression

    I just bought a boat with a 140 Evinrude 1978, the compression is around 105-108 on 3 cylinders and113 on the other one. It sounds and runs strong was just wondering if this is normal compression for this old a horse? Thanks Chris
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