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Type: Posts; User: Adam

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  1. Replies
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    105 is correct

    105 is correct
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    Lean seizure , look at the exhaust side to of...

    Lean seizure , look at the exhaust side to of piston. It’s melted.
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    This looks very similar to a Skat trak setback...

    This looks very similar to a Skat trak setback pump , but not set back as far . This pump would retro fit GP1200R and GP1300R’s too .
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    Detonation sensing ECU for 2 strokes

    Did any manufacturer ever make a detonation sensing ECU for 2 strokes ?
    I know 4 stroke ECUís can measure the ionisation of the combustion event thru the spark plug . Thanks Adam
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    960

    This fixes the power valve opening uniformity.

    This fixes the power valve opening uniformity.
  6. Thread: group k build

    by Adam
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    The GP1200R waterbox is fine , the 1300 box has...

    The GP1200R waterbox is fine , the 1300 box has an extra sound suppression pod that will not improve the speed or power over the 1200 unit .
  7. An R&D grate will work well with an R&D plate ....

    An R&D grate will work well with an R&D plate . The ride plate controls the hull attitude when on the plane going fast . A nose up angle is faster , they usually have strakes that keep directional...
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    A better impeller will get you over 60mph

    A better impeller will get you over 60mph
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    181

    Ok , the intermediate bearing is fine . If it was...

    Ok , the intermediate bearing is fine . If it was the problem the engine would still have the same problem. The pump liner is where you need to look , the liners are known for expanding due to...
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    JetSki Brothers YouTube channel.

    I have been watching the JetSki brothers YouTube channel for a while now , they have been trying really hard to get more people watching. Three Brothers who truly love their 2 strokes and have done...
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    That’s a big repair bill , effectively making the...

    That’s a big repair bill , effectively making the ski worth a fraction of a running unit . The market is flooded with GPR’s in the same condition, we are starting to see 4 strokes in the same market...
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    That oil will have preserved everything just...

    That oil will have preserved everything just nicely.
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    Okay totally different things. A GP1200 and...

    Okay totally different things. A GP1200 and XL1200 NON power valve have the same jetpumps . The GPR and XLT1200 have a part of the intake moulded into the hull .
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    Ok , the GP1200 65U engine is 120mm from centre...

    Ok , the GP1200 65U engine is 120mm from centre of crankshaft to the reed mounting surface. The manifold is 110mm wider again plus the carbs stick out another 15mm from the manifold. So 225mm from...
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    The GPR is a side draft manifold vs a 90 degree...

    The GPR is a side draft manifold vs a 90 degree manifold on a GP 65U engine . Are you limited by side clearance? I have both engines as spare engines, what measurement do you need ? The GPR Carbs...
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    Doubled up the anti siphon valves and it stopped...

    Doubled up the anti siphon valves and it stopped the dribble , now I’m having issues with it cutting out . Might have a bad battery.
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    72mph run

    72mph run
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    681

    Let us know how the 05 joint pipe goes , I felt...

    Let us know how the 05 joint pipe goes , I felt mine pulls harder with it now .
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    The carbs are closer together on the GP1200 ,...

    The carbs are closer together on the GP1200 , wonít fit . The adapters will fit but you would need individual pod filters . Tau Ceti make good ones for the GP1200R .
  20. It won’t hurt your performance much but will give...

    It won’t hurt your performance much but will give better handling in rough water .
    A 99 GP1200 stock grate is a smaller opening and is faster than a bigger opening grate with the bars cut out .
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    Use a longer bolt , the OEM bolt is 7 mm too...

    Use a longer bolt , the OEM bolt is 7 mm too short in its engagement with the thread in the crankshaft. This can cause problems with it coming lose . Or breaking off the flywheel and crank snout ....
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    A pin that is slightly smaller in diameter to the...

    A pin that is slightly smaller in diameter to the piston pin and tap it gently while supporting the piston so no side load is transferred to the Conrod .
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    I see you still have a stock rideplate , an R&D...

    I see you still have a stock rideplate , an R&D plate is way faster .
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    The cause of this problem is twofold, one the...

    The cause of this problem is twofold, one the powervalves donít open symmetrically because the plastic joiners flex and fatigue over time . This means the rear cylinder is running at full power try...
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    I run a 158mm 14 vane setback Skat trak pump ,...

    I run a 158mm 14 vane setback Skat trak pump , this transforms the ski like no other mod . It’s the most overwhelming change you can make to any ski , use the power you have more effectively and you...
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