I've developed a slight knocking noise on my 2003 250 HPDI. It's gradually getting louder. I'm hopng it's a valve or lifter or something simple. I don't think it's loud enough for a rod bearing, but I guess it could be. It still runs good, but I'm not going to run it anymore until I get it checked out. Any ideas what it could be?
Thanks!
Those motors do not have any lifter's or valves to speak of. Usually a knock in a two stroke motor means the bearing on one of the rods. Could be a bad injector knock. Get her checked out before you run anymore. If it blow's it is going to cost a lot more to fix.
Marks Props 317-398-9294, 1850 East 225 South, Shelbyville, Indiana 46176 propellerman59@gmail.com http://www.marksprops.com/index.html
Have you been using Ring Free or Sea Foam??
12 lbs 9 oz caught on 4/28/1975 Lake Eufaula
Thanks guys!
Duh, 2-strokes don't have valves..what was I thinking?
Yes, I have been using Ring Free. Not many hours on it either. And I don't run it that hard.
Took it in Saturday 7/8 to get it checked out...no word yet...thankfully it's still under warranty (extended). I'll let you know what it was...
Update on my motor....it's blown!...no compression on one cylinder...
Dealer has a new power head on order, should be here end of next week.
Everything covered under warranty. I got the "3 year extended warranty for free" spring promotion deal when I bought it in 2003.
Guess I get to do the break-in thing all over again. Well, cruising around the lake is not such a bad deal this time of year since it's so hot.
It's been a while, but I thought I would update this...
My dealer installed the new powerhead and had to do it by strict guidelines from Yamaha to get paid for the warranty work. As a matter of fact, the dealer had to break it in for me and send Yamaha the computer download before they would release it as complete. so when I got it back, it was fully broken in, per the new procedures, which included 1 hour on the stand and 3 hours on the boat on the lake at various speeds.
Which brings me to the apparent cause of my motor's failure as well as many others. The dealer told me these engines have been blowing because of inadequate break-in procedure (per original Yamaha instructions). Apparently they now require added oil in the gas, etc, which was not a requirement before.
I guess Mercury had the right idea about variable mix and higher mix ratio during break-in.
My dealer replaced the power head with a brand new one and replaced all maintenance type items...spark plugs, filters, water pump, etc. Also added a water seperator filter in the boat (not standard in 2003), all under Yamaha instructions.
They also told me I needed a 105 amp starting battery to continue to make the warranty valid, which I agreed to pay for since my battery was 3 years old. So the whole deal only cost me $85 for the new battery, plus gas back and forth from the dealer (2 hour ride).
I've only had it out 3-4 times since I've had it back, but it runs fantastic!
I read this on the batt before on here and I changed mine out to a big Trojan. But what just @#$!% me off Yamaha has never sent me nothing on this. I still got two years on warr. Gonna run the piss out of it the next 1 1/2.
Which starting battery did you go to? My 250 HPDI came with the Trojan 24SM-850. It worked fine all season, just wondering if I need to go larger.
Now I thought the HPDI's doubled oil without having to add it to the gas durring break in?? I would like some clarification on that statment from someone in the know!! At least Ranger broke mine in for me!
I'm no expert, but my understanding is they set them rich at the factory. I know mine runs rich, because when I removed the intake covers to winterize, I had oil residue around the intake ports. In the spring I plan on adjusting per the pinned topic on this page. I brought it in after break in. and my tech only changed the plugs and checked the torque on the covers.
I don't know if it matters how you run it, but I would get alot of hours on it before the warranty runs out! I think if the break in wasn't adequate, at least one cylinder is gonna go sometime, so the sooner you find out, the better!
As far as the battery, I went with the biggest one they had at Advance Auto Parts...it is an Autocraft Titanium 115 reserve capacity, 800 CCA.
The dealer told me Yamaha and other brands have gone to the bigger battery to make sure there is always enough power for the injectors so there are no misfires of the injectors. Running lean on gas will kill a cylinder in a hurry.
As far as the Yamaha oil pump on the HPDI, it is not variable, so it never changes mix ratio.
Hmm, there was no mention of battery when I got my boat back (in December). Mine is an '05 that blew #2. Like above, Dealer did break in, and Yamaha paid for water pump, external filter, etc. I haven't cleared 10 hours yet, but mine is oiling like crazy and has already fouled the plugs a bit. Once past 10 hours, I'll get the dealer to change plugs and check the oiling.
Austin, I think the dealer told me the newer models come with the bigger battery. I don't know if it's true for all or when they started but maybe yours already has it??
Mine seems to be oiling normally...no fouled plugs and normal consumption. Mine already had a recall done in '04 for excessive oil consumption, which included a hotter plug and a different pump linkage. It was a voluntary recall for those who were having excessive oil consumption, especially for excessive idling (like trolling). I didn't idle a lot, but my consumption was high. The recall fixed the problem back then and it seems the same now after the rebuild.
I could be wrong but I thought it was on here they want a group 27 now with 1000 amps. So that is what I put in. This was up sometime last winter.
what is the messuring of oil at idel and full open oil pump "trottel" how much oil ???
i got 2 300 hpdi 2005 that has been unter water and now one is running but i like to bee sure about the oil !!
stenboeg
Wow!!! Never heard anything like that when I blew 3 heads in less than 14 months on my 250 HPDI from the dealer or from Yamaha. Let me say that I was on the phone with both, upset I was!!
But than again Yamaha blame me and the dealer for the 1st blown head, the dealer broke in the second head and Yamaha blame them, and on the 3rd there TEC REP broke in the motor and it blew with 14 hours on it. Yamaha not saying to much than!
I feel that Yamaha is pointing the finger at the boating public for all there problems with the HPDI's. After what I went through with two 250 HPDI's in a short period of time, that's my conclusion. Good Luck, hope everything works out for you. Glenn
The mechanic where I bought my boat stated the HPDIs DO NOT double oil themselves via the computer. The dealer is supposed to open the oil linkage all the way and let it run for a predetermined amount of time before it leaves the lot. Then it is up to the buyer to follow the break-in procedures per the owner's manual.
Glenn,
Sorry to hear about your ordeal...I hope mine is cured...so far so good, time will tell of course.
I think Yamaha has learned from experiences like yours since they insisted that the dealer did the break-in a certain way (as I described above) and send in the download before they could get paid for the repairs. They did not point any fingers in my case, they just wanted to get it fixed and make sure it didn't happen again. Maybe you and others like you paved the way for that.
From what I hear, they had too many like this and maybe they learned something. Apparently the break-in is critical. I'll bet they will come out with computer controlled oil ratio at some point, like Mercury. I don't think they should leave it up to the owner or the dealer if it's that critical. Let the computer do it!
Glenn, I really want to know...when did yours happen and how was it resolved in the end? How long has the latest fix lasted?
Thanks,
Mark
Trojan 27 Series. Was told by Skeeter this is what should be used.
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