Fix Yamaha Waverunner VX deluxe Overheating - New Cylinder head and gasket installation

Tech Tuesday, this time is back with tech tips on jet skis.

Disclaimer: Slight mechanically skills will be required and necessary to do this job properly.

Extensive video on a Yamaha VX 110 Deluxe, with a problem of running Hot/Overheating after a few minutes of use on the water. The jetski runs totally normal in idle and during freshwater flushing, but cannot go full power for long before activating the temperature sensor/overheating.

Avoid falling into this trap when you buy a jetski, it will show normal operation in a driveway, but NOT on the water.

Main problem is most likely, that the ski was operated in salty waters near coastlines with waves creating sand and saltwater mixture ingestion throughout the engine, which in turn clogs up the cooling canals inside the engine (cylinder, Anode, head, exhaust manifold). This result in normal operation at low power settings with no noticeable problem, but the engine will struggle for deteriorated cooling when forced to give power. Depending on the amount of clogging the warning light will come on at lower or higher settings.

Here is a how to, DIY on trouble shooting and fixing/changing your head gasket, cams and head on your Yamaha VX Deluxe or equivalent.

I used a new Head delivered from SBT, and it works just perfect. Buy a new set of gaskets on Amazon and you are ready.

As promised in the video, here is a link to the service manual, with all tech specs and torque values on your jetski Yamaha VX deluxe 110/1100

https://dokumen.tips/documents/servic...

Symptoms could also be:

Jetski is overheating, only when under load and everything is normal otherwise. Meaning you can flush it and run idle and no overheat warning is coming on. The minute you give power and sail for a little distance approximately 700 yards, the jetski overheat and goes into limb mode.

Here is the possible failure and solution to this problem, and how to solve it.

the jetski used here is a Yamaha VX deluxe, however this could be the case on any jetski out there, which has been in salty, dirty or sandy waters. They simply ingest the salt, sand and dirt and cloggs the coolant system.

enjoy and work slowly towards to finish line. No rush is recommended .


enjoy, and sail safely,

best regards Rene