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    2002 200hp OX-66...Rodbolt, what is this sound

    When working on the engine, I occasionally hear a faint pulsing sound (about once every 15 seconds). It has happened since I had the motor (about a year). Tonight it got the best of me and I had to figure out where it was coming from. I usually hear it from the throttle plates. I narrowed it...
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    200 Yamaha OX66...RPM loss at WOT

    I've been testing this thing for a couple weeks now and have yet to find a solution. The engine is a VX200TLRA. With Rodbolt's help, I found I've got a 2003 block. As the title states, I've gone from running 5200-5400 RPMs at WOT down to 4500RPMs. Sometimes it'll get up to around 5000RPM...
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    Vacuum bench test new lift pumps

    Will new dry lift pumps hold a vacuum? I'm replacing the lift pumps on a 2002 motor (VX200TLRB) and decided to do the vacuum test on them while I'm waiting to install the VST filter. 1 of the 3 original pumps would hold 30kPa for 10 seconds before bleeding off. None of the new pumps would...
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    2002 VX200TLRA O2 sensor tube question...

    I'm trying to buy the washer that sits on the inside of the O2 sensor housing, it goes between the housing and the exhaust gas tube that leads the gases to the O2 sensor. I also have to replace the gasket that is between the housing and the block. My question is this, at boats.net they only...
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    Please help, 2002 Yamaha tilt/trim problems

    On a 2002 3.1L Yamaha VMAX. Is it typical for the trim shafts to become mushroomed on the ends? Mine appear to have been worn that way during use. I was planning on just replacing the seals, but I cannot get the cap to slide off the end of the trim shafts due to the enlarged diameter. I...
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    200 ox66...stator (or VRR) help please (vx200tlrb)

    I've been fighting a battery non-charging issue for a couple weeks. It's warm enough for me to try and fix. I replaced all the connections at the battery terminals hoping that was the problem. With the key off and nothing else connected, I would get a spark to the battery terminal when I...
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    03 Yamaha 200hp OX66 seems to be eating batteries...need suggestions

    I've had this boat for a couple months now and am having a problem with the brand new Interstate cranking battery. After using it for a few weeks it lost enough charge to not even power the fish finders while on the lake. I only had a 2 bank charger on the TM batteries so I figured being a...
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    Water pressure...how high is too high?

    I replaced the poppit valve on a 2003 200HP OX66 engine to the new style. I've got better pressure at low RPMs (8-10 when cold and 4-6 when warm) but now at WOT I'm getting up to 28-29 psi. With the old style (not too dirty) I was getting 4 (maybe) at idle and 20 or so at WOT. I'd attribute...
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    1996 Mariner 115 tilt/trim questions.

    Through the process of determining why my tilt/trim gauge wasn't working (several steps from gauge back to motor) I realized the pivot shaft that connects the engine to the hydraulic arm was walking itself to the port side, thus not making contact with the tilt/trim sending unit. I found that...
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    Control box (commander 2000) worn gears...I think

    Hey all, I've replaced the control cables and did a bunch of work over the winter. I noticed this afternoon that I'm not getting full WOT RPMs. After adjusting the cables and doing a Link & Sync, when I advance the throttle to WOT, the carbs aren't opening all the way (about 1/2 I'd say, this...
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    Exhaust Side Water Jacket question

    Hey all, I've got a question for some of the wrenches that frequent these parts. I pulled the exhaust cover plates to check things out. I noticed that there was more carbon buildup on 1 and 2 compared to 3 and 4. Is this normal, knowing that at idle 1 and 2 are used and 3 and 4 come on at...
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    Yet another axle question

    Since I've found there are several axle experts out there, I figured I'd post my dilemma. I've been putting off looking at my bearings/spindles after the end of the season. I repacked them prior to a long trip, and found water in one side and signs of it in the other. The previous owner had...
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    1996 Mariner 115 carb part numbers...help

    I've pulled my carbs and was trying to reference the part numbers to tell if they were WME 33/51/etc. The part number cast into each carb body is 3301-824902C. I can't find that part number anywhere on the mercury parts express website. The main jets I pulled out were not matched to any of...
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