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  1. Replies
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    Lowell is the master of these engines. Give him...

    Lowell is the master of these engines. Give him a call. He can tell what each mod will do for your engine and how to set it up right.
  2. Thread: Gp1300/1200 Help

    by x29c
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    14
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    1,385

    I checked the spark before on a GPR and I could...

    I checked the spark before on a GPR and I could barely see the it. The ski ran great. So your spark may be ok.
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    RIP Bill. You will be missed by everyone.

    RIP Bill. You will be missed by everyone.
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    19,127

    Hang in there Bill. We're all pulling for you. ...

    Hang in there Bill. We're all pulling for you. Prayers for you and your family.
  5. Oside's mod equalizes the pressures on all three...

    Oside's mod equalizes the pressures on all three carbs. If one pump fails the other two pumps will give fuel to the carb with the failed pump (and the other two carbs) at a lower pressure because...
  6. Hard to say. The only way to tell for sure is to...

    Hard to say. The only way to tell for sure is to do plug chops at 1/4, 1/2, 3/4 and finally at WFO when it was in running condition to be sure you had enough fuel in each cylinder at each throttle...
  7. If you do not have compression you will not have...

    If you do not have compression you will not have combustion and your plug will look like it was running rich.
  8. I would do a compression and leak test before you...

    I would do a compression and leak test before you ride it. That number one plug looks like it was not firing, carb is not functioning properly or you have lost compression in that cylinder. The...
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    Off idle bog after 10 minute break?

    Hi, I have a Lowell ported 1390 GPR.

    The last time I was out (91.3RAD) it ran great for 30 minutes then I took a 10 minute break on the water. Started it up and it was bogging off the line (wet...
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    Removing the CAT creates less restriction and...

    Removing the CAT creates less restriction and more airflow through the engine. You need to re-jet. Check out OsideBill's jetting recommendations.
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    Run it again until it runs away. Pull the...

    Run it again until it runs away. Pull the ignition tether then open the throttle wide to kill it. Check the spark plugs and see which one or ones were running lean. Make sure the carb and manifold...
  12. Thread: 2000 gpr 1200

    by x29c
    Replies
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    608

    Sounds like your carbs need to be rebuilt. In...

    Sounds like your carbs need to be rebuilt. In order to do that you need to remove the stinger and you can look inside for the D-plate.
  13. Thread: Bog on WOT run...

    by x29c
    Replies
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    4,433

    Picture of dumping #3 and using a Jet Works on a...

    Picture of dumping #3 and using a Jet Works on a stock head in post #113

    http://www.greenhulk.net/forums/showthread.php?t=37208&page=3&p=628147&viewfull=1#post628147

    and another talking about...
  14. Thread: Bog on WOT run...

    by x29c
    Replies
    51
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    4,433

    http://www.greenhulk.net/forums/showthread.php?t=7...

    http://www.greenhulk.net/forums/showthread.php?t=78332&highlight=dumping+cylinder
  15. Thread: Bog on WOT run...

    by x29c
    Replies
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    4,433

    It becomes an issue with bigger pitch impellers...

    It becomes an issue with bigger pitch impellers and higher speeds causing higher cooling pressure. With individual heads people will dump #3 overboard through a pisser. I use a Jet Works valve set...
  16. Thread: Bog on WOT run...

    by x29c
    Replies
    51
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    4,433

    I tighten the boot snug, not too tight and put a...

    I tighten the boot snug, not too tight and put a little grease on the sealing surfaces.

    You may want to check the pressure on that boot. Ride with the seat off and see how much it expands at high...
  17. Thread: Bog on WOT run...

    by x29c
    Replies
    51
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    4,433

    Excellent...have fun.

    Excellent...have fun.
  18. Thread: Bog on WOT run...

    by x29c
    Replies
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    4,433

    Yes, you would have to take the carbs off...skip...

    Yes, you would have to take the carbs off...skip that since you were not frying a piston and you did not take the carb rack off. It is a good practice to check it.

    The head gasket can be used a...
  19. Thread: Bog on WOT run...

    by x29c
    Replies
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    4,433

    Good luck.

    Good luck.
  20. Thread: Bog on WOT run...

    by x29c
    Replies
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    4,433

    They look ok. Bolt it back together. ...

    They look ok.

    Bolt it back together. Pressure test it. Make sure you have no water leaks.

    Take it for a little ride and check the plugs. If the RPM's drop at WOT do not keep the hammer...
  21. Thread: Bog on WOT run...

    by x29c
    Replies
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    4,433

    Not very pretty. Number 3 is pretty chewed up...

    Not very pretty. Number 3 is pretty chewed up and a little on number one. What does the piston wash look like on 1 and 3? What are you using for a main jet?
  22. Thread: Bog on WOT run...

    by x29c
    Replies
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    4,433

    Yeah that is about the best explanation so far.

    Yeah that is about the best explanation so far.
  23. Thread: Bog on WOT run...

    by x29c
    Replies
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    4,433

    Looks a bit scared up from the oil/water mix on...

    Looks a bit scared up from the oil/water mix on the exhaust and intake side...but as long as you cannot catch a finger nail in them they are still usable.
  24. Thread: Bog on WOT run...

    by x29c
    Replies
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    4,433

    Is cylinder wall outlined in red scored at all? ...

    Is cylinder wall outlined in red scored at all?

    281560
  25. Thread: Bog on WOT run...

    by x29c
    Replies
    51
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    4,433

    Does the stinger coupler hang over the number 2...

    Does the stinger coupler hang over the number 2 cylinder?
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