I'd start by cleaning the carbs or injectors and looking for a vacuum leak
on the intake.
On a fuel injected engine, if you take away the MAP signal (Engine load
basically) it will idle and run but have a high speed miss.
On the trailer, are you running it up in RPM?
Try putting a hair drier on the ignition module to see if it misses on the
trailer.
-----Original Message-----
From: shop-talk-bounces@autox.team.net
[mailto:shop-talk-bounces@autox.team.net] On Behalf Of Mark
Sent: Sunday, July 01, 2007 10:28 AM
To: shop-talk@autox.team.net
Subject: [Shop-talk] Looking for SeaDoo Info.
I know there is a wealth of knowledge on this list and hopefully someone can
give me some tips. My Daughter bought a 95 SeaDoo Jet Ski with a 580 Rotax
engine. It runs but seems to run out of grunt and misses at high RPM under
load. We have checked compression and it measures 150psi in both cylinders.
We replaced plugs which were fouled with a new set of NGK's as specified.
It starts and idles but will die unless you give it some gas. On the
trailer, with the garden hose attached, it runs fine; it only has a problem
under load in the water which makes it difficult to diagnose. It has fresh
gas but I
haven't found the fuel filter yet, maybe today. Any experts on the Rotax 2
stroke engine that can tell me what a logical approach is to finding the
problem?
Mark
Nashville
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