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    Question re: Arjay 6011 transom pour, inner skin prep

    Hello, I am soon to pour the transom on my 2002 Larson 21 ft using Arjay 6011. Of note, there is no issue with removing wood, because the transom core was structural foam that failed due to poor overall design and surrounding reinforcement. These issues have been shored up with knees in the...
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    Question re: pulling the cap

    Hi, I'm pulling the top cap on a 2002 Larson 210 outboard model. When winching/pulling the cap off, where are the best anchor points to place the rope? I have 1 cleat in the front, 1 on the outside of each driver/passenger seat, and then 2 on each side of the back of the hull. I also have...
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    Question re: repairing composite/VEC hulls?

    Hi, I have a 2001 Larson 210 OB (outboard set up) with the VEC hull. The transon has numerous spider cracks in the gel coat around the motor mount area, and after the last trip out, I noticed a 1-2 inch crack in the top of the transom cap. The transom also flexes now. So, I'm grounding it...
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    Video of inline 6 and Black Max engines at Mercury Films Festival

    In the past 4-5 years, I have received numerous helps and suggestions from this forum concerning the restoration, upkeep, and maintenance of my '75 150 HP, '87 115 HP, and '87 Black Max featured in this video contest sponsored by Mercury Marine. Each boat was a "project" and I consulted with...
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    Just love this boat-motor combo!

    Last November, I found a 2002 Larson 210 Senza (set up for an outboard) in upstate NY (I live in SC)without an engine for what I thought was an unbelievable price on ebay of $850 considering it has the VEC hull and I had previously always owned early-mid 70s tri-hulls that eventually...
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    question re: carb compatibility between 1972 and 1978 115 HP

    Hi, just trying to confirm if the carbs off a 1978 V-4 115 HP will work on a 1972 115 HP? My guess is no, but wanted to confirm. Thanks for the clarification!
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    '86 Black Max XR2 150 HP update/video on lake

    Hi, bought this engine last December to go on a 2002 21 ft Larson runabout that I obtained around the same time sans engine. I submitted several threads during the process of getting the package going and received valuable help and advice from the board ranging from the cooling system, power...
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    Power trim motor question Design 1/XR2 150 V-6

    Hello, I have a question about my PTT unit: The motor is new to me. The original PTT system bled down and would not hold at WOT. The motor pumped fine with no abnormal noises. Because of the bleed down, I purchased another used PTT unit and installed on the motor. It would not bleed down...
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    question re: splashwell drain holes at idle

    Hi, I have a 2002 Larson 21 ft bowrdider with an outboard setup and 20" transom. The boat is new to me and after mounting a Merc XR2 V-6, I noticed that when the boat is sitting in the water, the drain holes in the splashwell are 1-2" under the water, allowing a puddle of water to collect in...
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    question re: prop hub diameter for inline 6 vs V-6?

    Hi, I have a 1987 V-6 XR2 150 HP and a '87 115 HP inline 6. I tried to use the 13X19 P Mercury Black Diamond prop from the 115 on the V-6 gearcase and although it fits, I noticed that the bullet diameter on the V-6 gearcase is bigger than the 115 gearcase. The boat-motor combo with the V-6 is...
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    question re: foward gear/clutch dog '87 XR2 150 HP

    Hi, I put this motor on a 2002 Larson 210 runabout with a manual jack plate and 19P prop with Flo-Torq hub II to start as the setup is new to me as boat and engine were purchased separately in the offseason as a project. Boat and motor are both 20" shafts. I think I have a worn clutch dog and...
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    What gear ratio do I have for lower unit: 1987 Black Max XR2 20" shaft

    Hi, I need to most likely replace the lower unit. The serial number is OB169260. Any confirmation is greatly appreciated! Thanks!
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    question re: starting point with 21 ft boat 150 HP

    Hello, I have a 2002 Larson 210 Senza bowrider that I recently mounted with a 1987 Mercury XR2 150 HP. The motor came with a 24P prop, which obviously is too high a pitch for the Larson as the Mercury came off a small bass boat. I also placed a manual jackplate on the Larson to go with the...
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    Question re: integral trim cylinder rebuild

    Hello, I have done some searching on this site re: the rebuilding of trim cylinders. I have a 1986 XR2 150, and the trim bleeds down with no visible external leaks. I have some experience in previously changing out the pump cartridge on this design, but realistically how difficult is getting...
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    question re: bowstop distance to truck

    Hello, . I currently have a 20 foot 2002 Larson V-hull on a single axle trailer. The magic tilt trailer has an adjustable axle. When I bought the boat, I had to move the bowstop forward to bring the transom over the rear support bunks and then also move the axle forward to get the tongue...
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    Question re: Mercury water pump base O-ring

    Hello, I am overhauling the water pump assembly on a 1986 XR2 150 HP. I purchased the complete overhaul kit from Sierra via iboats. My question is concerning the O-ring that goes around the outer diameter of the pump base insert. I discarded the OEM O-ring prior to receiving the Sierra kit...
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    1986 Merc 150 HP XR2: How many thermostats?

    Does this engine have more than 1? Just bought it and wanted to replace these along with the impeller. I keep reading posters say "replaced the thermostat(s)," so just wanted to clarify for ordering purposes. Thanks!
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    Tach question 4 stroke to 2 stroke?

    I bought a 2002 Larson 210 that originally had a 4 stroke engine. I'm putting a '86 Blackmax 150 on it. The original tach is still in the boat and it's a Faria and on the back says "Universal." It has what looks like to be a knob for several pole settings, but is it going to work on a 2...
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    V-6 150 XR-2 questions about cooling system tuneup

    Hello all, I recently purchased a '86 XR-2 that runs well and will be going on a 20 footer. I want to make sure the cooling system is in top shape before it goes on the water. Obviously I want to change the impeller. So, I need an impeller kit and thermostat. Does this engine have poppet...
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    question re: transom trim molding?

    Hi, I have a 2002 Larson 20 foot bowrider. Both of the vertical molding pieces - on starboard and port side - that go from the top of the transom motor mounting surface to the start of the rub rail are cracked and need to be replaced. For some reason, Larson decided to make these out of...
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