HPDI INJECTOR QUESTION

[flounderpounder225]

No Bruce, I don't have a 6 wire spark gap tester, but I am going to go get a good spark gap tester and make sure #6 is actually firing. Then move on from there, I just can't believe it's not firing the plug and the injector is NOT working correctly if I am making 5600 rpm? My reasoning toward a reed is this; IF the injector is working correctly, AND the plug is firing correctly then we are down to an incorrect fuel/air ratio mixture, and the only thing that controls the air into the combustion chamber is the reed valve right? More later, I received my YDS cable and software from SIM yamaha so I am going to read up on that this morning, and connect the laptop to the engine and do a little learning.  Maybe that will reveal a secret of what is going on?  Thanks

[flounderpounder225]

Well something not right between the laptop and the ECM, kept getting a COMM error, so I checked the spark with my new spark gap tester, all good.  Proceeded to remove the intake box, to take a look at the reeds hopefully through the throttle bodies, guess Blue Agave nailed it in an earlier post when he spoke of the reed valves, managed to get a decent photo shot down the throat of the #6 throttle plate.. What do you all think?   


Here's the strange but good part, compression on 6 is the same as all other cylinders, so if the engine ingested this piece, could it have exited the exhaust port? Everything I have read, says an ingested stock steel reed will destroy the cylinder

[Blue Agave]

When I was researching changing my reeds I recall reading about an instance where someone had ingested a stainless reed and did not suffer any damage. So it does appear to be feisable that this could have happened to you. I would suggest you give Chris Carson Marine a call and talk to Mr.  Carson and get his thoughts on the issue you are experiencing.

[flounderpounder225]

Exactly what my plan was this morning, since today is a holiday I plan on doing some digging into this.  Chris gets great reviews on THT also.  Thanks

[baby1]

perhaps it didn't make it to the cylinder// if you can put a scope in the cylinder ,, throw the sparkplug or injector ,,you could look for damage or scoring // I work on these a lot so I would just pull the heads  and look // 

[wingtime]

I have to chime in about Chris Carson....  He is TOP NOTCH.  He rebuilt a powerhead for me in the past and he really knows his stuff.  He also is happy to give advice on the phone, especially about reeds.  If I were you Marc I'd give him a call.

[flounderpounder225]

http://www.classicaquasport.com/gallery/showphoto.php?photo=11302&title=image260&cat=500

I still can't figure this picture thing out, but here is a link to my gallery, this is the piece of reed, never got ingested, just sitting in the plenum!


Amazing.  I am going to scope the cylinder, and yes Bruce, spoke with Chris Carson this morning, he is mailing me a set of reeds tomorrow! Hopefully this will totally wake this motor up

http://www.classicaquasport.com/gallery/showphoto.php?photo=11300&title=image257&cat=500

[Blue Agave]

never got ingested, just sitting in the plenum! Amazing.....

.......Hopefully this will totally wake this motor up

That's great that you recovered the missing reed!  It appears a lotto ticket may be in order.  The new reeds are going to make your motor purr.  I noticed a greater throttle response and have also noticed increased fuel efficiency.

[RickK]

You were very close Marc.  I edited the post above to add the "Linked Image" code.  After you get the images into your gallery you click on the image you want to post and it will appear in a slide type display.  Look to the right and you'll see two boxes with code in them.  Select and copy the code in the "Linked Image" box.  This is the same code you select when you use PhotoBucket.  Are you using the iPad to do this?  If so, I think touching and holding for a sec brings up some options.

I hope I got the pix in the correct order above.

[flounderpounder225]

Thanks Rick, I'll persevere through it, I'll check the link codes, wasn't feeling too hot but wanted to post the pics.  Yeah, I can't wait to see how this thing runs, no telling how long it has been like this.


I did it Rick!

[Capt. Bob]

 

[wingtime]

Man that's a stroke of luck!  My Merc 200 had a loose reed screw that luckily was trapped in the bottom of the plenum.  A new reed block and fiberglass reeds REALLY improved the idle and throttle response.  I can also confirm Fernando's motor idles and runs MUCH better with the new Carson Reeds.

[flounderpounder225]

If anyone wants the yamaha YDS Diagnostic software, the users manual I have it all and it is residing at Dropbox.com.  Pm me with your email, and in can "share" this whole folder with, you can download it and even burn it to a DVD.  If you have an HPDI, OR 4 stroke, this would be valuable.  You need the interface cable, but you can get one various places.

[flounderpounder225]

[flounderpounder225]