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Type: Posts; User: 4x15mph

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    Scoring and lower compression

    I have a yamaha LS2000 jet boat with 1200 NPV engines. Last week had an overheat condition caused by impeller jam and I now have lower compression in cylinder #2 (about 15 PSI lower than cylinders...
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    Polo - as Speedling wrote, this is very likely...

    Polo - as Speedling wrote, this is very likely "cavitation". The key will be to determine if the driveshaft is spinning under heavy load/rpm's or not. You can pull off the black cover where the...
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    Yes, we are starting to read about these timing...

    Yes, we are starting to read about these timing chains in the 1.8's. Apparently the chains changed in 2016 to resolve this so some of the jet boaters are talking about changing over to the new parts.
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    Possible to put in a groupk or other air/fuel...

    Possible to put in a groupk or other air/fuel separator pump to help amp up the fuel delivery? I use this on my twin, 1200 jet boat although I don't have the power valves.
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    Other option is to install a pump housing with...

    Other option is to install a pump housing with the replaceable, plastic liner. If the noise is coming from the stainless housing, which warp over time, it will help quiet it down some.

    On...
  6. Have you checked the reeds? That's another...

    Have you checked the reeds? That's another possibility outside of the carbs and/or a fuel delivery problem (filter, lines, aftermarket pump?)
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    Rebuilt the suspect carb with genuine Mikuni kit...

    Rebuilt the suspect carb with genuine Mikuni kit and replaced the fuel line and return line between this leaking carb (#1) and the next one in line. When reattaching the fuel lines, I used a smaller...
  8. Sticky: I am using a GroupK air/fuel separator on my...

    I am using a GroupK air/fuel separator on my LS2000 w/ Mikuni carbs (44SBN, 3 carb per rack). I have to think that with this setup, the electric fuel pump eliminates the need for balancing the fuel...
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    Raider1200, thank you. I am sure you are right...

    Raider1200, thank you. I am sure you are right about ordering the single gaskets versus a whole kit but I had bit the bullet and the kit arrived already. As for the brass inlet, it is a threaded...
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    Thank you dockwalker. I ordered a Mikuni kit and...

    Thank you dockwalker. I ordered a Mikuni kit and rebuild the 1 carb that is leaking. I was hoping to hear more info from this forum about whether this could be the result of a sticking needle or...
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    Carb help, Leaking gas

    Yamaha LS2000 with twin 1200 Non-PV engines. Mikuni carbs with a GroupK air/fuel separator, electric pump.

    Started the engines for the first time this season and 1 of the carbs is leaking fuel. I...
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    Did you ever figure this out? I am having a...

    Did you ever figure this out? I am having a similar problem and I had just rebuilt the carbs last year with a cheaper non-mikuni kit.
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    Did you check the exhaust chamber and make sure...

    Did you check the exhaust chamber and make sure that it is not clogged and possibly overheating?
  14. I think the price is on the upper end for someone...

    I think the price is on the upper end for someone that can't tell you anything about the history of the ski. As long as you jump in thinking you have another $1K to spend, otherwise you might be...
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    This confuses me a little; "It don't need to...

    This confuses me a little; "It don't need to work just not broken"

    Say it again
  16. Thread: sx 230 ho

    by 4x15mph
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    Also, try asking your question on jetboaters.net...

    Also, try asking your question on jetboaters.net if you haven't already.
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    You say that the engine turns over and fires up...

    You say that the engine turns over and fires up when you give it starter fluid. That says a lot and eliminates electrical (spark) to some degree.

    I know nothing about the spark. Does it have...
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    if the hose fell off they probably didn't secure...

    if the hose fell off they probably didn't secure the oil lines with Oetiker clamps and it was probably still using the original zip ties. That is the root of most oil injection problems on these...
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    Impellers on a 2001 Yamaha LS2000???

    i am hearing mixed answers to whether my Yamaha LS2000 OEM impellers have a specific pitch to them and whether there are specific sides for each. I tried boats.net and other sites but I can't find...
  20. No, this boat does not have catalytic converters....

    No, this boat does not have catalytic converters. I hope someone can chime in with some things to look at. I don't think swapping the plug wires and coils is that easy but I will check on that. ...
  21. This is the non powervalve 1200 engine. It has...

    This is the non powervalve 1200 engine. It has the 1200, 135 HP yamaha engine. It is a 2001 Yamaha LS2000. Thank you and I appreciate any and all help!
  22. Yamaha LS2000 2 Stroke, Only hitting 6K RPM at WOT

    I wanted to see if you could help me diagnose an issue that I am having. The issue is that my starborad engine is only hitting ~6000 RPM's at WOT while it used to go to ~7000 and the port engine...
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