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Next: drift-angle of Seadoo XP ?
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External
Since: Jul 17, 2003
Posts: 11
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(Msg. 1) Posted: Fri Jul 25, 2003 11:57 pm
Post subject: Need help with Ultra 150
Archived from groups: rec>sport>jetski (more info?)
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I started having some trouble with my '99 Ultra 150 today.
It ran fine for about 30 minutes. When I was riding full throttle across the
lake, the RPMs suddenly dropped down to about 5500. No warning lights or
overheating. I grabbed a handful of throttle, and it jumped back up to full
RPMS. A couple of minutes later, same thing. Let off the throttle for a second,
grab it again, and it shoots right back up to normal. Starts happening more
frequently, and after less time.
Took the ski in, pulled the plugs. Cyl1 and 2 look fine, 3 is very wet and
oily. I thinking, ok, fouled plug. So I cleaned the plug and get back in the
water. Take off, jumps right to full throttle, minute later, RPMs drop back
down. Go back in, take a look at Cyl3 plug, dry and tan, just like the other 2.
Replace all 3 plugs, get back in the water. Exact same thing.
It really feels like one of the cylinders in cutting in and out. Could these
be repeated mild seizures? A short in a spark plug boot? I guess I'll check the
compression of all 3 cylinders.
Anyone experience anything similar?
Nathan
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External
Since: Jul 17, 2003
Posts: 11
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(Msg. 2) Posted: Sat Jul 26, 2003 12:42 am
Post subject: Re: Need help with Ultra 150 [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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As a followup.... I just checked the compression, and for what it is worth, it
is normal and consistent across all 3 cylinders.
>
>I started having some trouble with my '99 Ultra 150 today.
>
>It ran fine for about 30 minutes. When I was riding full throttle across the
>lake, the RPMs suddenly dropped down to about 5500. No warning lights or
>overheating. I grabbed a handful of throttle, and it jumped back up to full
>RPMS. A couple of minutes later, same thing. Let off the throttle for a
>second,
>grab it again, and it shoots right back up to normal. Starts happening more
>frequently, and after less time.
>
>Took the ski in, pulled the plugs. Cyl1 and 2 look fine, 3 is very wet and
>oily. I thinking, ok, fouled plug. So I cleaned the plug and get back in the
>water. Take off, jumps right to full throttle, minute later, RPMs drop back
>down. Go back in, take a look at Cyl3 plug, dry and tan, just like the other
>2.
>
>Replace all 3 plugs, get back in the water. Exact same thing.
>
>It really feels like one of the cylinders in cutting in and out. Could these
>be repeated mild seizures? A short in a spark plug boot? I guess I'll check
>the
>compression of all 3 cylinders.
>
>Anyone experience anything similar?
>Nathan
>remove nospam to reply
>
Nathan
remove nospam to reply >> Stay informed about: Need help with Ultra 150 |
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External
Since: Jun 22, 2003
Posts: 24
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(Msg. 3) Posted: Sat Jul 26, 2003 7:07 am
Post subject: Re: Need help with Ultra 150 [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"Nathan Bond" wrote in message
> I started having some trouble with my '99 Ultra 150 today.
>
> It ran fine for about 30 minutes. When I was riding full throttle across
the
> lake, the RPMs suddenly dropped down to about 5500. No warning lights or
> overheating. I grabbed a handful of throttle, and it jumped back up to
full
> RPMS. A couple of minutes later, same thing. Let off the throttle for a
second,
> grab it again, and it shoots right back up to normal. Starts happening
more
> frequently, and after less time.
>
> Took the ski in, pulled the plugs. Cyl1 and 2 look fine, 3 is very wet and
> oily. I thinking, ok, fouled plug. So I cleaned the plug and get back in
the
> water. Take off, jumps right to full throttle, minute later, RPMs drop
back
> down. Go back in, take a look at Cyl3 plug, dry and tan, just like the
other 2.
>
> Replace all 3 plugs, get back in the water. Exact same thing.
>
> It really feels like one of the cylinders in cutting in and out. Could
these
> be repeated mild seizures? A short in a spark plug boot? I guess I'll
check the
> compression of all 3 cylinders.
>
> Anyone experience anything similar?
I have the exact same problem with my 900ZXI. My compression is consistent
on all cylinders. >> Stay informed about: Need help with Ultra 150 |
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External
Since: Jun 24, 2003
Posts: 168
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(Msg. 4) Posted: Sun Jul 27, 2003 5:31 pm
Post subject: Re: Need help with Ultra 150 [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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sounds like possible trash in the fuel tank(blocking the pick up) or a clog
somewhere in the fuel system.maybe even a weak fuel pump.not much goes bad on
the electrical on those ski's..i have replaced several fuel pumps.i change them
over to the high flow mikuni pump.makes em start easier too.scott
scotts performance powersports >> Stay informed about: Need help with Ultra 150 |
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External
Since: Jul 17, 2003
Posts: 11
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(Msg. 5) Posted: Sun Jul 27, 2003 6:58 pm
Post subject: Re: Need help with Ultra 150 [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Thanks for the reply, Scott. I guess a very easy check would be to switch over
to the reserve pickup to see if the primary is blocked somehow.
Just one followup question, if I may. When I was looking around yesterday
trying to find anything obviously wrong, I noticed the air temp sensor had come
unglued from the side of the hull and was dangling just maybe a quarter inch
from the waterbox. It was probably getting really hot, advancing the timing the
full 6 degrees. I am running and ADA head, so my compression is already higher
than normal. In your opinion, could this have anything to do with it? It was
100 degrees that day, so I'm thinking it probably would have advanced at least
3 degrees on its own.
>
>sounds like possible trash in the fuel tank(blocking the pick up) or a clog
>somewhere in the fuel system.maybe even a weak fuel pump.not much goes bad on
>the electrical on those ski's..i have replaced several fuel pumps.i change
>them
>over to the high flow mikuni pump.makes em start easier too.scott
>scotts performance powersports
>
>
>
>
Nathan
remove nospam to reply >> Stay informed about: Need help with Ultra 150 |
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