How to do a Compression Test on a Outboard Motor | Yamaha HPDI

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[@dexmartin5037]

Great job I’ll be following you from now on I just bought a boat with a 300 hpdi Yamaha, it’s going to get service tomorrow and tested wish me luck pal

[@Griswald1968]

Glad to see you're mechanically inclined, Will. The fuel system on those HPDIs need constant love. Even the "secret" filters. Good luck!

[@brianbutler6122]

hi Will what did you find out with this motor i am have the same problem can anyone get the software how much does it cost thanks

[@WillCory]

Shoot me an email and I'll get ya pointed in the right direction. Mine ended up being bad coil but threw some new plugs in too.

[@brianbutler6122]

[e-mail]. thank you

[@TheMakani01]

Come do mine

[@ruffrize]

U should’ve warmed up the motor for five min

[@WillCory]

If it had damage it will show up either way hot or cold. Main thing I was looking for was not being consistent with the others more then the psi because it still ran and hit max rpm.

[@ruffrize]

Will Cory So what was the issue? Ever found out

[@WillCory]

@@ruffrize Just finished it up today. #4 Coil was cutting out . Hooked up the laptop and turned off each coil 1 by 1 looking for no change.