1994 GTX 657 – Sudden Heavy Smoke, Oily Plugs

[micro222]

Hey everyone,

I’m troubleshooting my 1994 Sea-Doo GTX (Rotax 657) and ran into a weird issue:

• Suddenly started producing thick white/grey smoke
• Both plugs are oily
• Compression is 110 psi on both cylinders (was 140)
• Engine runs fine, no power loss
• No premix, stock oil injection system
• Blocking the oil feed doesn’t change the smoke
• No oil visible outside, and no oil sprays out the plug holes when cranking
  

Has anyone seen this happen on a 657?

Thanks!

 

[mikidymac]

At 110 compression I am surprised it even runs on the water. If it was 140 and you lost 30 psi compression that engine is done, time for a rebuild.