Decarb of HPDI - The Hull Truth

jchief · 01-12-2005, 11:05 PM

I've read quite a bit on this forum about motors and it is very interesting as I am fixing to buy a new boat. I have read something about "decarbing" the HPDI motors. What is this, how often does it have to be done and does it have to be done on the newer motors?

Merci!

Glen E · 01-12-2005, 11:08 PM

Quote:

jchief - 1/12/2005 11:05 PM

I've read quite a bit on this forum about motors and it is very interesting as I am fixing to buy a new boat. I have read something about "decarbing" the HPDI motors. What is this, how often does it have to be done and does it have to be done on the newer motors?

Merci!

doa search on decarb - you'll get lots...

bbogue · 01-13-2005, 06:56 AM

I decarb mine every 50 hours. With the plug fouling the 250's and 300's seem to be prone to, I can't imagine not doing it. There's got to be carbon build-up on more places than the plugs. On the other hand, since my plug fouling is finally over, I probably could do it less often.

Bill
03 250HPDI

Major Woods · 01-13-2005, 07:24 AM

The newer motors use less oil than the olders ones for sure.
I decarbed after the first 150 hours of operation with seafoam. Had slight puffs of smoke come out the exhaust for the first 15 seconds of operation then nothing after that.
On some older motors the smoke was billowing out for 10 minutes, this diffrence showed me that decarb is not really a nessesity every year on the newer motors, I plan to seafoam every 200 hours just for peace of mind.

bassonthebrain · 01-13-2005, 07:38 AM

I have to do mine every 60 hrs or so.

BigBone · 01-13-2005, 08:18 AM

Mine run best if I decarb b4 every trip. It takes me about 2 hours to do it.

vinny f · 01-13-2005, 08:42 AM

my250 hp ox yamaha motor will be 4 years old this launching.every time i fill up the tank i add the reccommended amount of ring free.i hope i don't jinx myself but the motor has never hicupped or puffed heavy smoke or for that matter hesitated starting ,stalled or even run noisey.i make sure the oil resivoir is full ,like i said i add the ring free when i fill the tank ,reccommended dosage,and have not had a problem in over 200 hours of usage.KNOCK ON WOOD

ChemGuy · 01-13-2005, 08:47 AM

BigBone- it might be time to get a tune up

BigBone · 01-13-2005, 11:09 AM

Chemguy,

I didn't even include washing out the inside of the cowlings, changing 12 plugs and remembering not to give it too much reverse coming off the trailer.

ChemGuy · 01-13-2005, 04:57 PM

BB-

You've got one of THOSE motors...Sorry man, I didn't mean to rub salt in that wound...It sucks and I hope they get the problems figured out for your sake and everyone that is involved.