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Old 02-01-2010, 06:57 AM
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Default yamaha 300 HPDI problems

what can you guys tell me about the problems / upgrades required in these motors? i'm looking at a grady that was repowered with these and i hear bad things. any info would be helpful.
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Old 02-01-2010, 07:59 PM
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just do a search, to much to list
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Old 02-01-2010, 08:08 PM
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I have one and it runs great. It is a little rough at idle since it runs on 4 cylinders until you snap it into gear. At present it has 302 hours on it. It is a 2005 model and all tthe updates were done to it at the factory before shipping. The oil pump was changed under a recall about a year ago. Other than that it runs good. I run pennz full synthetic oil and use startron or Pri-G as an additive to the fuel.
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Old 02-01-2010, 08:09 PM
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Be careful not to read to much into hear say. Most of the people ragging these motors have no first hand experience with them. I have had 6 big block hpdis (4 250s, and 2 300s) and had one wiring harness to the oil tank go bad on one of the 250s...but it didn't leave us stranded. Other than that, they were excellent, reliable, strong motors and never missed a beat. I would own a updated pair again without hesitation. Keep in mind, verados and optimaxes both had issue in the early stages, but after being fixed they are now considered great motors...I think the same of the hpdis now that yamaha resolved any issues with updates.
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Old 02-01-2010, 09:36 PM
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Boy I was scared to death from what I read on THT regarding the 300HPDI, but went ahead and repowered my boat with a 300HPDI in 2005 and it was a great engine up to the point I sold the boat last Aug. It ran flawlessly for the 500+ hours I put on it. After 300+ hours it was time to replace the plugs, other than that it was just routine maintenance with filters & lower unit oil. Friend of mine bought the boat and he has put another 100 hours on it too. It gave great performance & economy, if I had to pick a complaint it would be that it was not four stroke quiet. As Bigtuna is saying take things from THT with a grain of salt. Have a Yamaha service tech put the PC on it, should tell the story of engines.
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Old 02-01-2010, 10:59 PM
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Boy I was scared to death from what I read on THT regarding the 300HPDI, but went ahead and repowered my boat with a 300HPDI in 2005 and it was a great engine up to the point I sold the boat last Aug. It ran flawlessly for the 500+ hours I put on it. After 300+ hours it was time to replace the plugs, other than that it was just routine maintenance with filters & lower unit oil. Friend of mine bought the boat and he has put another 100 hours on it too. It gave great performance & economy, if I had to pick a complaint it would be that it was not four stroke quiet. As Bigtuna is saying take things from THT with a grain of salt. Have a Yamaha service tech put the PC on it, should tell the story of engines.

Ha Ha thats why yamaha ditched this 274 hp motor
love Yamaha but im sorry
even a reach around feels so coooooooooooooooold
it sux to be in mexico with 0 back up from the white corprate japanese office.

by the way my daughter is Japanese www.tigerlilysportfishing.com
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Old 02-01-2010, 11:04 PM
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I copy LASRT8. I have a 2005 300 on my 23' Grady Gulfstream and it runs great. Starts perfect everytime. Just make sure you filter your gas well prior to the motor's internal fuel filters. It's also good to run a gas treatment product like PRI. The motor will surge and limit your RPMs when the internal fuel filters need to be changed/cleaned out so make sure you service them once a year.
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Old 02-02-2010, 04:41 AM
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Quote:
Originally Posted by Bogii View Post
Ha Ha thats why yamaha ditched this 274 hp motor
love Yamaha but im sorry
even a reach around feels so coooooooooooooooold
it sux to be in mexico with 0 back up from the white corprate japanese office.

by the way my daughter is Japanese www.tigerlilysportfishing.com


Yamaha still makes a 300 HPDI. They call it a Series 2, but only offer it in a 20 inch shaft. I called Yamaha and asked them the difference in the Series 2 and the old model 300s that we are speaking about now. Thier response was that the Series 2 has all the updates that the older 300s had to have, and a couple minor tweaks. Other than that, same engines.
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Old 02-02-2010, 05:29 AM
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Quote:
Originally Posted by Bogii View Post
Ha Ha thats why yamaha ditched this 274 hp motor
love Yamaha but im sorry
even a reach around feels so coooooooooooooooold
it sux to be in mexico with 0 back up from the white corprate japanese office.

by the way my daughter is Japanese www.tigerlilysportfishing.com
Don't quite get your response or attached image, OP asked about 300HPDI; I had one on my previous boat and gave the OP first hand experience. It sux to be any where with no back up or support from any corporate office, pretty sure it is not just exclusive to Japan

BTW - Nice Mirage & YFT , don't get YFT that big up here in the mid Atlantics where I fish
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Old 02-02-2010, 09:34 AM
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2006......300 hours......no problems..........love it..........wished they still made it!!
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Old 02-02-2010, 11:59 AM
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2004 300 HPDI purchased new 12/05. Oil pump changed per recall and updates done at time of purchase. 475 hours no major issues.
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Old 02-02-2010, 12:56 PM
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Just read Gringos post, It'll tell you everything you need to know....lol
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Old 02-02-2010, 05:43 PM
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Quote:
Originally Posted by Gradyslider View Post
I copy LASRT8. I have a 2005 300 on my 23' Grady Gulfstream and it runs great. Starts perfect everytime. Just make sure you filter your gas well prior to the motor's internal fuel filters. It's also good to run a gas treatment product like PRI. The motor will surge and limit your RPMs when the internal fuel filters need to be changed/cleaned out so make sure you service them once a year.

We've got the same set up and a 2004 engine. Zero problems. Just take care of it, use correct filters and priG regularly.
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Old 02-09-2010, 08:05 PM
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For the guys that use PRI-G -

I don't want to burst your bubbles but PRI-G contains Shellsol D60 which is a known mineral spirit solvent. It's not as bad as ethanol for your engine in terms of solvency but it is pretty close. If you haven't already I would switch to a different fuel additive that lubricates rather than one that contains a high-grade solvent.

MSDS is here: e10gasadditives.com/fuel_additive_list.html
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Old 02-09-2010, 09:01 PM
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Im happy with mine
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Old 02-19-2010, 08:27 PM
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Default I got two Z300's also...one good and one with a few issue.



I have got two of the first 300's from early 04. (Z300TURC).. I bought them used in 07 with 49 hrs on them. They have had some issues... Yamaha has provided various modifications during the warranty. Just before the end of warranty in late 08, an aluminum housing for the cooling on the back end of the port motor broke apart. It a somewhat known issue that can be found in various forums and not just with 300's. The corrosion issue is where a stainless spring sits directly against thin aluminum cast in the cooling water that is salt... so it corrodes. The break put salt water into the motor pan while I was running back home 20 miles off shore. The air intake is low and sucked up some salt air mist and fouled a few cylinders. It took 7 hours to putt in on the starboard motor!. The port motor ran a little rough, but the dealer said the power head was done. With a little persuasion, Yamaha covered the new power head under warranty. They tried to say it was lack of maintenance but it was pretty obviously an issue... so they agreed to cover the 10K in motor repairs... Thank you Yamaha!. While in the shop they upgraded the oil pumps to inject more oil in mid range use.... That sounded great also....and I appreciated that but they stuck me with fixing the corrosion issue on the starboard motor because it was not broken..... it was going to break so I fixed it so I did not break down 20 or more miles off shore again. They also stuck me with two new water pumps... but that many have been the dealer getting some extra cash.. not sure how that ended up being my cost... I was happy to shell out $800 for a fresh factory tech tuned motors that I could rely on.

Well... the new oil pumps inject a lot more oil now and foul the plugs when I went trolling (idling reduces the cylinders to two or four)... They did not foul before the warranty work!. I Had the experience of loosing a motor after a few hours on troll...Well, there is a fix for that. Troll for a while then pull up and burn the buildup off the plugs (2500rpm or more for 15 minutes) then troll again. Swap back and forth rather than troll with both and carry a few sets of new replacement plugs. A hassle... yes but then again it's 40 to 50K to re-power and I did get a deal on the used motors so I am still not really complaining too much.

As of last weekend, I have a pissing problem on the port engine... so I am back on-line to research that issue. Ever since the warranty work was done the pisser has been weaker than normal. This winter on the last fire up.... it was a dribble. So I am land locked until that gets fixed.

All in all.... I am a Yamaha fan. dirt bikes, street bikes, 4-wheelers and outboards. Over all my years of ownership I have had one on going issue and its the port side z300. I run up to 120 miles off shore so I rely on these motors to operate and for the most part they do.

I also have a 225 HPDI and it blew a power head last spring... It started running rough so I shut down, paddled back and took it in. No over heat, no over rev, no computer issues. They figured two oil injectors clogged. That motor was 6 months out of warranty! but Yamaha replaced the power head for free with out any persuasion.... the dealer even fixed my boat tailor lights...the bill was $0.00! I tried to take the dealer staff to lunch and they decline and said the motor should not have failed and I did not need to do anything but go back to fishing. How cool is that! (Mt Houston Marine, Houston Texas) I bought that motor used also with about 50 hours on it... It failed at 160 hours. Runs good now..

So I deal with a few issues.. is there a boat owner that does not have a few issues every now and then? I think most of the issue I have had with the 300's is the fact that they were new in 2004 and the product was not fully field tested. If the motors were purchased after 2006 they have more of an impression of reliability because the early motors had to go in several times for upgrades. In my research on issues, most of the complaints are pre 2007 posts.
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Old 02-20-2010, 08:58 AM
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Default hpdi junk

I have a Grady White Marlin with two 300 HPDI's. For the first 3 years they were fantastic
Yamaha had a recall on the oil pumps last year and they replaced both at no charge.
Within the first month after they changed the pumps, one of the engines blew.
The bill was $8.000.00 , but I only had to pay $2,000.00. They assured me that the other engine would not have the same problem. Well guess what? My Boat is in the shop again for the same problem on the other engine. I would look into buying the new 300 four strokes. Don't know much about them, but they got to be better than what I have.
My resale value has dropped to nothing. Who wants to buy a boat with two rebuilt engines?
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Old 02-20-2010, 09:09 AM
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Default hpdi junk

Quote:
Originally Posted by steigerbob View Post
what can you guys tell me about the problems / upgrades required in these motors? i'm looking at a grady that was repowered with these and i hear bad things. any info would be helpful.
check my post below richie60
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Old 02-20-2010, 09:21 AM
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I had a small idleing hiccup after the oil pump recall but thats it. First i have heard of that!!
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Old 02-20-2010, 09:31 AM
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Originally Posted by richie60 View Post
I have a Grady White Marlin with two 300 HPDI's. For the first 3 years they were fantastic
Yamaha had a recall on the oil pumps last year and they replaced both at no charge.
Within the first month after they changed the pumps, one of the engines blew.
The bill was $8.000.00 , but I only had to pay $2,000.00. They assured me that the other engine would not have the same problem. Well guess what? My Boat is in the shop again for the same problem on the other engine. I would look into buying the new 300 four strokes. Don't know much about them, but they got to be better than what I have.
My resale value has dropped to nothing. Who wants to buy a boat with two rebuilt engines?
Richie60
WOW. This is why I stay away from HPDIs now and only go 4 stroke.
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