1998 yamaha 1200 jet ski cannot start do not have code

See page 46 of the attached PDF manual (page 2-19) What you are actually seeing is "EXHST" which indicates the exhaust temp is too high. http://www.yamaha-motor.com/assets/service/manuals/2001/lit-18626-04-01_360.pdf

you may have an air leek on carbs or its running too lean

Call a dealer with the engine number they will have it on a network file

does it have spark at plugs ? carb clean and fuel new ?

which make of jet ski have you as all different ??

2001 2002 Yamaha Waverunner Xlt800 Factory Service Repair Manual

if its xlt 1200 its inside the big black electric box at rear of engine ! unbolt it and remove the back cover !

http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=9&cad=rja&uact=8&ved=0CEoQFjAI&url=http%3A%2F%2Fdespair127.oggettipromozionalitorino.com%2Fbenefit%2Ffx1-jet-ski-shop-manual-2423515.pdf&ei=pTqcVeu0IYP_-AHZ04u4BA&usg=AFQjCNFpybz5NcwUh428WXluJvk3NM-gHw&bvm=bv.96952980,d.cWw

check for broken/blocked pipe to the meter and clear/replace as nessessary.

you may have something clogged in a water passage but more than likley u have a bad sensor the sensor is located on the main exhuast if you go on the right side of the ski and look in the engine compartment it will be located at 9 oclock u will see it sticking out of the exhuast with one wire comming out after u run the ski and the buzzer goes off pull the seat and see if the engine is really hot if u can not touch it will be hot but it has to be very hot for the sensor to pick it up if u can touch the motor and exhuast it is a bad sensor