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Old 17 July 2018, 16:54   #1
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Country: UK - Wales
Town: Pembroke
Boat name: Rapscallion
Make: Humber Destroyer 6.0
Length: 5m +
Engine: Yam 150 HPDI
Join Date: Jul 2006
Posts: 81
Dealer or someone with HPDI expertise?

Having big problems with my up-to-now super reliable and awesome 2001 Yam 150HPDI. Local dealer not much help as he's never seen another one. Can anyone recommend a dealer in the UK (south ideally) or anyone else with real expertise in diagnosing these engines?
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Old 17 July 2018, 16:58   #2
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Country: UK - England
Town: penzance
Boat name: not named
Make: ski boat
Length: 5m +
Engine: 150 HPDI
Join Date: Sep 2013
Posts: 189
What are the symptoms? have you/they hooked up Yam Diagnostics?
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Old 18 July 2018, 13:43   #3
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Country: UK - Wales
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Boat name: Rapscallion
Make: Humber Destroyer 6.0
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Engine: Yam 150 HPDI
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Symptoms, that were intermittent but are now constant are simply a loss of power - maybe 20-30hp? Can't get above 5000 / 36kts when loaded - used to rev out to 5600 / 40-42kts, but engine is silky smooth - no misfires no hesitation, just feels like it's running 3/4 throttle. Plug condition suggest engine is running borderline lean.
Have changed all filters (including the VST internal, VST to HP pump and all the 'secret' filters), plug caps (two of which were arcing), changed plugs and plug caps, Changed Throttle position sensor (looked like it was giving low voltage but new one is the same), cleaned oxygen sensor.
YDS shows no fault codes and everything including fuel pressure looks in order on diagnostics.
I'm 1k in for parts and dealer labour but given up with the dealer now - more checks tonight - injector resistances, coil resistances etc.

Any ideas?
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Old 18 July 2018, 14:01   #4
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Country: UK - Scotland
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Make: Ribcraft 6.8
Length: 6m +
Engine: Suzuki df200
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Posts: 2,586
Those are really popular across the pond, maybe worth joining a USA forum or speak to Davie on here, big yam dealer in Scotland can maybe point you somewhere.
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Old 18 July 2018, 14:54   #5
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Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
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Just could be this, post# 39.

I've got a new toy...
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Old 18 July 2018, 15:03   #6
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Country: UK - Channel Islands
Town: Jersey
Boat name: Jazcabelle
Make: Ballistic
Length: 7m +
Engine: Petrol 150
Join Date: May 2017
Posts: 176
Search for Wellhouse on here.

Hes an active member that helped me out a great deal with my 150 hpdi
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Old 18 July 2018, 15:07   #7
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Country: UK - Wales
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Boat name: Rapscallion
Make: Humber Destroyer 6.0
Length: 5m +
Engine: Yam 150 HPDI
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Quote:
Originally Posted by jwalker View Post
Just could be this, post# 39.

I've got a new toy...
Not that sadly - picks up perfectly from 4 to 6 and is silky smooth even when low on power. Thanks for the tip though. Update coming below
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Old 18 July 2018, 15:08   #8
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Country: UK - Wales
Town: Pembroke
Boat name: Rapscallion
Make: Humber Destroyer 6.0
Length: 5m +
Engine: Yam 150 HPDI
Join Date: Jul 2006
Posts: 81
Quote:
Originally Posted by Chanchan168 View Post
Search for Wellhouse on here.

Hes an active member that helped me out a great deal with my 150 hpdi
Had a long chat with him on the phone today - really helpful and gave me some stuff to follow up
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Old 18 July 2018, 15:13   #9
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Country: UK - England
Town: suffolk
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Make: Nautica
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Engine: Yamaha 115 4 stroke
Join Date: Jan 2015
Posts: 223
just prohably totally unrealistic but someone has,nt swapped your prop ?
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Old 18 July 2018, 15:14   #10
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Country: UK - Channel Islands
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Boat name: Jazcabelle
Make: Ballistic
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Join Date: May 2017
Posts: 176
Brilliant news Jon. Hes got a wealth of knowledge and is always happy to help.

Hopefully youll get it sorted. I know bhg marine do parts too as Ive totally rewired mine.

Good luck
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