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05-25-2015, 08:27 PM #1
- Join Date
- Aug 2013
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- Iowa
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2001 XLT 1200 rebuilt - issues after 1st hour of running - bogging down, misfires
Just had the engine rebuilt and put back in the ski. (Premix, d-plate, already had SBT improved PV so it didn't need the waveater clips, carbs rebuilt, new reeds,etc). I had purchased a D-Plate and waveater clips (ended up not needing either so I'm going to need to sell those).
Ran it for the first time in the water on Saturday...started right up and ran pretty well for the first hour or so of break in. There was a little bogging down or misfire around 2-4k RPMS, but it would go past it and then run well. It did seem to misfire (muffled pops in the exhaust) when accelerating, though overall I was impressed with the performance.
When I went back out to run it some more, it seemed much worse (lots of misfires, loss of power). It started smoking a lot more than it did when I was initially running it.
I was running a 32:1 mix for this first full tank, so I'm wondering if it was too rich and if that caused some problems. The rear cylinder plug (#3?) was wet every time we pulled it out after running. For the most part, plugs 1 and 2 were dark, but dry. Since it wasn't running well, I ran it to the boat ramp to get it taken out and on that ride it wouldn't go more than 5k RPMs, was smoking a decent amount, and couldn't get going more than 12MPH. If I pulled the throttle fully, it would bog down to the point of dying. I'd have to feather it to get it up to the 5k rpm.
Out of the water it revs fine and I don't hear the misfire/bogging down.
Looking for suggestions on a plan of action to tackle the issue.
Fairly new to the world of jetskis and have a buddy who has been doing most of the work on the ski for me (after sending the engine off for rebuild).
Thanks in advance for any suggestions!
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05-25-2015, 09:06 PM #2
- Join Date
- Mar 2007
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- 182
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Who rebuilt carbs?
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+1 by:
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05-25-2015, 10:21 PM #3
- Join Date
- Jun 2011
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- 149
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bad coil, bad wire, bad plug or bad carb on that cylinder. Since its a new motor check compression across the board and make sure they are even and you didnt get a dud motor. If ok, Start with a new set of plugs and If possible on these (havnt pulled coild on these yet) swap the coils between 2 and 3 and see if the middle cylinder starts fouling. If so, your coil or wire is dead. If not, i would look into the carbs. the #3 carb may be leaky or someone miss counted their turns out on a needle
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05-26-2015, 10:40 AM #4
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- Aug 2013
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- Iowa
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05-26-2015, 08:52 PM #5
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- Aug 2013
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- Iowa
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05-26-2015, 08:58 PM #6
- Join Date
- Aug 2013
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- Iowa
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Should I attempt to pull the plug wires and test them with an ohm meter?
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05-27-2015, 11:42 AM #7
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- Aug 2013
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- Iowa
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05-27-2015, 04:00 PM #8
Did you remove the old fuel or run it through? I would also check this as well... http://www.greenhulk.net/forums/showthread.php?t=39216
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05-27-2015, 07:47 PM #9
Search here for O'sideBill's posts and check the carb settings.Don't blow the new engine without making sure the carbs are right.
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05-30-2015, 11:14 AM #10
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- Aug 2013
- Location
- Iowa
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We'll go through the carbs again.
Is this the info you are referring to?
http://www.greenhulk.net/forums/showthread.php?t=70129 This doesn't look like it is for stock setup though?
Or this one: http://www.greenhulk.net/forums/showthread.php?t=62751
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