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    Yamaha vmax 150 no spark on #2 and #5 ??

    awhile back I had a severe intermittent missing issue, diagnosed that as a stator, bought a used one because a new one is about $600.. problem solved.. now, about 6-8 mos later ive got no spark on #2 and #5.. I used a friends tester wiring harness with key switch, still the same results.. I...
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    Does coil DVA voltage go down at higher rpm?

    I have about 200 volts at idle but goes down to 40 volts at higher rpm.. is that normal??
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    Cylinders #1 and 3 no spark at high rpm's yamaha 150 vmax..

    after checking fuel supply, compression etc, it appears that after I put a timing light on all wires while running the motor at about 3000 rpms, ive got a bigtime drop in spark on #1 and #3.. my next step is to switch coils from other sparking cylinders to see the the lack of spark follows those...
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    Yamaha vmax 150 erratic mis-fire or no fire??

    I posted the other night about my 2003 Yamaha vmax 150 carb motor running like crap and bogging etc.. well, after testing and checking fuel system, running on separate tank, checking for air leaks etc.. I put a timing light on each cylinder while the engine was under load in the water.. at...
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    FUEL OR ELECTRICAL?? 150 VMAX DROPS RPM RUNS BOGGY. CARBS OR COIL?

    I HAVE A 2003 TLRB150 VMAX 150 CARB MOTOR THAT HAS RUN GREAT UNTIL A FEW WEEKS AGO.. IT STARTED TO DROP RPMS INTERMITTENTLY, RUN KINDOF BOGGY SO, A FRIEND OF MINE WHO IS A MARINE TECHNICIAN SAID IT PROBABLY NEEDED THE CRABS REBUILT SO, I TOOK THE CARBS OFF, GOT THE KITS AND HE REBUILT THE CARBS...
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    need complete lower unit for 2008 merc 60hp 4 stroke..

    anyone have any idea where i might find a used lower unit for a 2008 mercury 60hp 4 stroke? thanks!
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    Yamaha powerhead warranty??????

    anyone know what the warranty is on a brand new yamaha 4 stroke powerhead??? thanks!
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    Crank and rod bearing color??? yamaha

    having the crank machined .010 under.. need to know which color bearing i need from yamaha.. the only specify color and not size.. thanks!
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    yamaha 4 stroke oil pump? 50hp...

    oil lite came on, replaced sending unit, changed oil, same problem.. does the pump go bad? bad pick up??
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    yamaha 50 hp four stroke rod bearings?? oil pump?

    i have a 98 yamaha 50 hp 4 stroke. the other day the oil light was flickering just a bit, checked the oil, seemed thin so, i changed the oil. also, put in a new sending unit. took it out for a spin yesterday.. all seemed fine for probably 4 miles at 4k rpm.. stopped for an hour or so.. storm...
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    merc 225 opti. ignition switch cause bad running??

    i have a 2000 merc 225 optimax. ran great last week.. the ignition switch seems to be somewhat faulty. it takes numerous cycles of the key for the engine to actually turn over. then, when it does, it runs like crap.. can the bad running be linked to a bad ignition switch??? or, can a low...
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    Compression Test.......

    this may sound like a stupid question but, my buddy is finding it hard to believe.. when doing a compression test, if you put some oil in the cylinders and the compression reads higher, proves you have a problem in the cylinder (rings etc..) not the head.. true???
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    ive got a YAMAHA NIGHTMARE on my hands!!!!

    as you may know from my previous posts.. i have a 1998 yamaha 50 horse 4 stroke.. it had low compression on #1 and #4 of the 4 cylinders.. so, i took the head off, took it to the machine shop, they did a vacuum test on all the ports and told me it was fine.. i got some info froma few guys on...
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    Leak Down Test...

    so, i did my own leakdown check.. put air into my #1 cylinder that has only 25 p.s.i compression and found the air to be coming out the dipstick hole.. when i blocked the dipstick hole, it came out the oil fill in the valve cover.. if im not mistaken, this means bad rings right??? by the way...
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    How Much Would A Dealer Or Shop Charge?

    how much do you think a dealer or shop would charge to re-ring my 1997 yamaha 50h.p. 4 stroke.. i did a leak down check and found air to be coming out of the dipstick hole. when i blocked the dipstick hole, it came out the oil fill in the valve cover..
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    yamaha 50hp 4 stroke timing belt install???

    hi, im in the process of replacing the head gasket on my 97 50 hp yamaha 4 stroke. i have everything all ready to be tightened up and cannot for the life of me figure out what the heck they are trying to tell me in the service manual as far as lining up the marks to install the timing belt.. if...
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    RODBOLT or yamaha guys! Yamaha 50hp 4 stroke low compression question!

    hi, i saw your past posts and it lookslike you really know your yamahas.. any help from anyone would be greatly appreciated!!! i have a 1997 yamaha 50 hp 4 stroke that runs ok but, has very low compression on cylinder #1 (like 30 p.s.i)and slightly low compression on cylinder #4. (around 90) 2...
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