Recent content by TThornhill

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    150 merc wont cold idle, and shuts off alot

    Hey all, 1998 150 merc 2strok carbed. Having what Im pretty sure if a fuel delivery problem. on the muffs, motor will crank right up, no problem, and stay running. once it gets in the water i have to make sure the primer bulb is tight, choke it, then have to rev it some throttle in neutral...
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    primer bulb with 2 different size hoses

    hello all. 1998 mercury 150hp 2 stroke. went to replace my fuel line / primer bulb. and saw there are 2 different sizes on the original assembly. from the fuel tank to the primer it looks to be 1/2. then after the bulb to the motor is 5/16. Im wanting to up grade to a 3/8, but dont have the...
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    cracked ring after rebuild

    just rebuilt my 1998 150 mercury 2 stroke carb, and had an issue with it when i got on the water. pulled the head off and found the piston ring cracked in the cylinder i just repaired. any idea on what would of caused this. when i first cranked it up on the trailer after the rebuild i initially...
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    just rebuilt powerhead, now change im compression

    hey all. 1998 mercury 150hp 2 stroke carb. a few of u may know. just finished my power head rebuild and had a few issues on the water when i took it out. thought it was fuel so i replace the primer bulb. while i was working on it i figured i would check compression. they were all around 95...
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    cant find what the warning horn mean

    hey all, 1998 mercury 150 2 stroke carb. took my boat out on the water, and every now and then when i would turn the key to on, it would do a constant beep for 3 - 4 seconds, then do the normal beep beep beep to indicate a proper working system. what does this mean??
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    rpm gauge need to be replaced or zero'd?

    hey all, i think i have an issue with my rpm gauge. i have a mercury 150 o/b on a 22' deck boat. according to my rpm gauge when im going about 15 mph steady, im sitting around 3000 rpm, i would think at that speed i should be below that. also when i trim up it can make an almost 1000 rpm...
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    merc 150 fuel issue/ bogging out

    hey everyone. 1998 merc 150 2 stroke carb. just rebuilt my powerhead and finally got it going. i put it in the water and putted around for a little while, then i decided to give it a little gas and the moment i throttled up, the motor started bogging and eventually would cut out. sometimes i...
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    Leak thru poppet valve weep hole

    1998 mercury 150 2stroke carb. Finished my rebuild, got it running, only thing wrong is a leak from a hole where the poppet valve is. Opened it back up and everything looks fine. Does the poppet valve have to actually go thru the hole in the block or does it just set against the seal? Diaphram...
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    finished powerhead rebuild, now have starting issue

    hello all, 1998 mercury 150 2 stroke, carbd, just finished my rebuild, got it back on the boat, go to start it up and all its doing is spittn and sputtering, its backfires randomly. all the coils seemed to be working fine as i cranked it up and had it running before the rebuild. any help please...
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    resizing main jets?

    1998 merc 150hp 2 stroke carb. read a few places that after performing my rebuild i should retard the timing about 2 degrees and increase the main jet by .002, which would take it from .074 to .076. (i guess to further prevent a lean mixture and to aid break in) and was wondering if this jet...
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    service bulletin 91-35 understanding

    1998 merc 150. 2 litre 2 stroke in the middle of my rebuild, and saw in a mercury manual that you need to "Remove idle stabilizer/advance module, install idle stabilizer and reset timing. Refer to Service Bulletin 91-35." what is this module that needs to be removed and what does it exactly...
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    oil injection piece mounted on crankshaft???

    i need to replace this piece that mounted on the crankshaft around the #4 cylinder, and i have no idea what its called, its drives the oil pump gear and is made of plastic and goes around the crankshaft, anyone knows what this is called??
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    OEM vs. aftermarket parts?

    so im just gonna enjoy using this forum, so i have another rebuild questions. as far as a gasket kit ( or any other parts really) would it be better to stick with the Quicksilver(oem) brand, or go with an aftermarket company (sierra is the most popular one ive seen). as far as pistion go i will...
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    can you reuse a damaged head?

    hello, posting another question concerning the same repair that i am working on. i am having to replace a pistion due to pre-ignition, chunks off the piston ring/ piston it self have put pits in the area of the head surrounding the spark plug. is this something that has to be replace? i know it...
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    can you resleeve a 1998 base 150 merc??

    hello, first time here. been searching around for some answers, and figured i would give this a try. recently ran into a issue with my boat motor, found it to be getting horrible gas milege and figured it would be good to do a compression check. all cylinders was decent, but one was a 0! crap...
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