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    Possible stuck valves. Do a leak down test to see...

    Possible stuck valves. Do a leak down test to see where it's losing compression (intake valves, exhaust valves, stuck rings). If the motor is rotating freely for a compression test, then not likely a...
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    Update. I've run a full tank of fuel through and...

    Update. I've run a full tank of fuel through and the ski is running well. 7450 RPM/14 PSI/64 mph on GPS. Only a couple of issues I still need to address: (1) small water leak from the exhaust...
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    Very helpful. Thanks. For reference I see approx...

    Very helpful. Thanks. For reference I see approx 60psi at idle when dead cold first start. But that drops way down to 25 when warmed up. Testament to letting an engine warm up before doing WOT.
    ...
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    I could not get my leak down tester to fit, but...

    I could not get my leak down tester to fit, but was able to use just an air gun and compressor and it looked like just shy of 100psi, and then when pressure was moved down it sealed again. Ski is...
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    Thanks for the responses, folks. @TMiller,...

    Thanks for the responses, folks.

    @TMiller, the cam journals look good; I guess the oil pickup screen did it's job. There was a lot of small bits of bearing material in the bottom of the pan,...
  6. Awesome. Mystery solved.

    Awesome. Mystery solved.
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    I checked the oil pressure relief valve per the...

    I checked the oil pressure relief valve per the shop manual. Made sure when depressed it came out on it's own, and there were no rough spots. Seemed fine. I did not pressurize it, and don't see that...
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    300LX Spun Bearings - Root Cause

    I picked up a nice condition, low hour 300LX a few weeks ago. Owner said the ski just stopped in the middle of the lake with a big puff of blue smoke. Owner had done a recent oil change with Royal...
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    SOLD Different part numbers. I don't have a 250/260...

    Different part numbers. I don't have a 250/260 block to compare.
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    Yes, a bunch of parts will be delivered this Tue,...

    Yes, a bunch of parts will be delivered this Tue, which is a full two weeks from when the orders were placed. All items were listed as in stock at the time.
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    No, they did not. Thanks. I'll order a set. Maybe...

    No, they did not. Thanks. I'll order a set. Maybe somewhere else but partzilla.com as they are taking forever to fill orders.

    I did check part numbers on the pan and oil pump assembly, and they...
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    I bought a 310X case/crank, and can report on the...

    I bought a 310X case/crank, and can report on the differences (pics enclosed). From what I can see:

    1) 310X has grooves on the top mains #1, #3, #5 (300X does not)
    2) Oil drain holes are much...
  13. Thread: Coronavirus

    by boudin
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    Which lake is closed @steve45? Lakes in Texas are...

    Which lake is closed @steve45? Lakes in Texas are not closed, however, state parks are closed. There could be some local closures due to flooding, or local counties closing smaller lakes due to virus...
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    It's a 300LX, so yes, supercharged. Thanks on the...

    It's a 300LX, so yes, supercharged. Thanks on the 300/310 case tip. I'll be sure to get a set of case bolts with my purchase. Opens my options quite a bit.

    Looks like the pan is the same among...
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    300 v 310 Crankcase

    Piecing back together a 2012 300LX that spun several main bearings. What is the difference between the 300 and 310 cases? Part numbers indicate they are not interchangeable. Just looking at my...
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    SOLD Ultra 300X Crankshaft, Crankcase, Rods

    Putting a 2012 300LX back together that spun several main and rod bearings. I'm looking for used:

    14001-0567 Crankcase 2011-2013 Ultra 300
    13031-3743 Crankshaft 2011-2020 Ultra 300, 310
    (4)...
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    Coupler is not bad; you suggest I just use an...

    Coupler is not bad; you suggest I just use an impact to pull the shaft and coupler together. Makes sense.

    -Greg
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    Found a pic of Kawasaki 57001-1764 for reference...

    Found a pic of Kawasaki 57001-1764 for reference here.

    -Greg
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    Thanks for the quick response, Steve. Good tip on...

    Thanks for the quick response, Steve. Good tip on welding a socket--the hole on that old Yamaha coupler was messed up long ago (it's about 10 yrs old), but still seems to work.

    I'll need to find...
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    Ultra 300LX PTO Removal

    What techniques are you using to remove the PTO coupler off the engine on a 300/310 motor? Has anyone bought and used the $180 tool, 57001-1764? Hard to see from the pic what it looks like and how it...
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    I made two of these a while back using scrap...

    I made two of these a while back using scrap 2x4s, screws and some carpet scraps. Cost me nothing except casters. A good amount of storage underneath for parts and such. Only complaint is they are a...
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    I have only the older version myself, so do not...

    I have only the older version myself, so do not know.
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    The gauge cluster rolls over at 1000. Below is a...

    The gauge cluster rolls over at 1000. Below is a pic of YDS on a high hour ski.
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    When you say "5 hours on SBT rebuild" do you mean...

    When you say "5 hours on SBT rebuild" do you mean you have 5 hours on a motor shipped from SBT, or a broken older SBT motor that you rebuilt and have 5 hours on?

    If the former, unfortunately you...
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    Timing chain sprocket looks good, but the cams...

    Timing chain sprocket looks good, but the cams are not. Line-up the outermost markers, like the red line in @blakegjones pic.

    Tips:

    Try to get the chain on the opposite side of the tensioner...
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