Yamaha WaveRunner GP 1300R - Recent Questions, Troubleshooting & Support - Page 8

No guarantees but here's website to check - http://www.yamaha-motor.com/assets/service/manuals/2000/lit-18626-03-71_752.pdf

You might have 2 bleed the system 2 make sure their is no air in the system

Need to hook up YDS diagnostics and check for codes first. Second you need to hook up a fuel pressure gauge on the motor and make sure your keeping steady fuel pressure. Did you check the grommet on top of the high pressure pump for a split in the rubber?

One cylinder may be starved for oil causing the noise your hearing.

How long has it been since you changed your water pump? The pressure relief valve can also cause over heat issues if it is stuck.

Some grease on the end of the trim rams and see if it don't go away.

the weight of the motor will be obtainable from the Yamaha web site in the specifications section the weight of the boat is any body guess as you didn't give a manufacturer name most marine shops will get close as they are familiar with boat constructions and supply trailers to suit

Yamaha Outboard Manuals by Seloc 1984 2014

Check this site out Sparky. How to Decide Between Two or Four Stroke Outboard Boat Engine

Only of you have ran the engine out of oil...Sounds like the carbs may not be set correctly.. .Did a professional do the rebuild?..What exactly was "rebuilt".. were any parts replaced? Sounds like the low speed (pilot jets/air screw passages may not be clean as they need to be??) Please check the compression on each cylinder..remove the spark plugs... hold the throttle (carbs) wide open when you check this.. spin the motor for 5-8 seconds... you should get 120psi. minimum..(and less than 10psi difference).. if less, it might be time to actually rebuild the top end..(new pistons/rings/hone cyl.).. only bore it if absolutely necessary.. get it measured.. There are only 3 parts in a two-cycle carb that ever need to be replaced,,(unless they are actually broken) The needle and seat assy., the jet needle and the needle jet. ..see pic... parts # 41 = needle and seat assy. #6 = jet needle, #37 = needle jet. The needle and seat regulate the flow of gas into the carb as the floats rise and fall..,, if they are damaged or leaking the carb will overflow with gas., the needle jet is a orifice with a specific size..The jet needle has a specific size, taper, and length..== The jet needle and needle jet work in unison to regulate the flow of gas from right off idle all the way to WFO..the needle jet/jet needle WILL wear over time causing the fuel/air mixture to become richer and richer and start fouling spark plugs..(this is more pronounced on 4-cycle ATV's)... I hope this has shed some light on your carb situation... Good luck... exploded view of mikuni carb Google Search

The Dry WEIGHT is 826lbs.

No, the gears in the lower unit are cut to rotate in the "other" direction... If the impeller were to rotate opposite - it would mean the engine had to run backwards... and that does not happen.

Mike, why are you needing to remove the screen? Its there to prevent larger particles from entering your engine..if its stopped up, use a pressure washer to CAREFULLY clean it.. other wise leave it there.

Hey Spencer, Its time for a complete carb cleaning and setting by a qualified professional... When you say ran fine out of water.. you DID have the "ear muffs" connected to provide water to cool the engine..?? If you DID NOT.. you MAY have more serious issues. Take this to a qualified pro!!