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  1. #1
    Big K's son KeithKman's Avatar
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    Drive shaft to prop problem? RPM down. *PICS*

    Went riding the Colorado River yesterday. Awesome ride. Ever since I changed the oil in the ski two trips ago my RPM's have been 8000 to 8050. They used to be 8150. Oil is in the middle of the two dip stick marks. I also changed my plugs, but I did not gap them. I know the air temp being 100 and the water being in the 50's effects peak RPM.

    Anyways, there was some debris in the water so after the ride I looked under the ski to make sure the pump and stuff was ok. I noticed the green piece in the picture was not up against the prop, it looked like it kind of backed it's way off a bit. I pushed it back on and it went on snug. Someone was telling me this piece twists on?

    Could this have been effecting my RPM? Could un-gapped plugs effect peak rpm? Any ideas?
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  2. #2
    HORSEPOWER JUNKIE 9secZO6's Avatar
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    the nosecone, remove it and be done....the threads are pulled off of it.

  3. #3
    Moderator Snoman's Avatar
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    Quote Originally Posted by KeithKman View Post
    Went riding the Colorado River yesterday. Awesome ride. Ever since I changed the oil in the ski two trips ago my RPM's have been 8000 to 8050. They used to be 8150. Oil is in the middle of the two dip stick marks. I also changed my plugs, but I did not gap them. I know the air temp being 100 and the water being in the 50's effects peak RPM.

    Anyways, there was some debris in the water so after the ride I looked under the ski to make sure the pump and stuff was ok. I noticed the green piece in the picture was not up against the prop, it looked like it kind of backed it's way off a bit. I pushed it back on and it went on snug. Someone was telling me this piece twists on?

    Acually it threads on...

    Could this have been effecting my RPM?

    Yes..It will also cause your ski to cavitate also...

    Could un-gapped plugs effect peak rpm?

    Plugs usually come from the factory pre-gapped..BUT it would be good practice to check them before you put them in...


    Quote Originally Posted by 9secZO6 View Post
    the nosecone, remove it and be done....the threads are pulled off of it.

    +1

  4. #4
    Big K's son KeithKman's Avatar
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    Interesting. So I guess I have to pull the pump? I wonder if I took a dremel and cut it I could just bend it off without pulling the pump. hmm.

    Also, one of the inserts on the ride plate came out. I cleaned the hole, applied epoxy, and pushed it back in. Think I am ok? I haven't tried putting the grate back on.

  5. #5
    Big K's son KeithKman's Avatar
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    Are there any down sides to removing the nose cone?

  6. #6
    R88ory RXP's Avatar
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    Quote Originally Posted by KeithKman View Post
    Are there any down sides to removing the nose cone?
    I think the cocensus is that if you ride in salt water tyhen leave it on as it helps prvent corrosion on the driveshaft splines in the prop. But if you ride fresh then you can take it off and gain a little top speed im not talking alot but a little. Every little helps i suppose. R88

  7. #7
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    Quote Originally Posted by KeithKman View Post
    Interesting. So I guess I have to pull the pump? I wonder if I took a dremel and cut it I could just bend it off without pulling the pump. hmm.

    Also, one of the inserts on the ride plate came out. I cleaned the hole, applied epoxy, and pushed it back in. Think I am ok? I haven't tried putting the grate back on.
    Pull the pump, takes about 5 minutes and your done.

  8. #8
    Big K's son KeithKman's Avatar
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    Quote Originally Posted by R88ory RXP View Post
    I think the cocensus is that if you ride in salt water tyhen leave it on as it helps prvent corrosion on the driveshaft splines in the prop. But if you ride fresh then you can take it off and gain a little top speed im not talking alot but a little. Every little helps i suppose. R88
    I'm only riding fresh.

    Also, what gap should the plugs be at?

  9. #9
    Big K's son KeithKman's Avatar
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    Quote Originally Posted by Alex13 View Post
    Pull the pump, takes about 5 minutes and your done.
    If I pull the pump, I can just slide the nose cone off the drive shaft, or do I have to pull the prop out of the pump?

  10. #10
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    Quote Originally Posted by KeithKman View Post
    If I pull the pump, I can just slide the nose cone off the drive shaft, or do I have to pull the prop out of the pump?
    You can grap it with a pair of vice grips and it spins right off... Use your impeller/prop tool to hold one side and vice grip the other..

    Do not have to pull the impeller!!

    Alex

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