lean condition

[phil blomquist]

89 evinrude 225 pulled plugs noticed #1 is alot leaner than the others running 62ds in top 4 holes 64ds in the 5 and 6 any suggestions what would cause #1 to be leaner thanks ahead of time phil

[racer]

Time all 6 cylinders to see if you have a timing issue, I am sure you timed number 1 but you need to verify the rest.

[phil blomquist]

thanks Al ill check timing on all cylinders motor has a bog out of the hole also maybe whole problem rest of the holes were a little too rich

[doogall]

89 evinrude 225 pulled plugs noticed #1 is alot leaner than the others running 62ds in top 4 holes 64ds in the 5 and 6 any suggestions what would cause #1 to be leaner thanks ahead of time phil

Phil, I have almost the same engine but a 91. If the timing checks out ok as racer has said to check, then it might be a head gasket problem letting a small amount of water into the cylinder. If the plug looks very clean and white on the porcelain. Cheers Craig.

[phil blomquist]

pulled the heads yesterday just to check out cylinders everything looks great did link and sink checked timing ok maybe just paranoid using old plugs so i can read them it was # 2 hole that looked cleaner than others bolted the 2.7 heads on this time went from 110 compression(3ltr heads) now is 150 psi compression kinda scary compression took it to the river and lit it up still has bog out of hole not as bad but still there but boy does it punch once its up gotta figure the bog out thanks phil

[Mark Poole ModVP]

OMC had a production run of V-6 loopers in the late 80's that were built with "extra" big bore carbs. I am thinking that this run was only around '86-88 but never know with omc. One of the symptoms of these motors was bog out of the hole especially on a tail heavy bass boat. Find an old OMC dealership that can look up sevice bulletins for you from around that time and get the part numbers for the carbs..

[phil blomquist]

the carbs are midbores out of 89 225 so my theory is on take off boat comes up exhaust under water 88 valero bowrider maybe gonna try starting with engine higherand go with chopper rather than raker just a thought

[gfinch]

Try this. Punch the inrichener just before/as you floor the throttle. Use it as an accelerator pump. then you'll know if it is too lean or something else.

[phil blomquist]

ill try anything the bog is driving me crazy plugs are really wet at idle idles are 34 mids 20 which is stock. are you thinking its a lean situation on the idles causing bog thanks for imput to all would be nice to come out of hole clean thanks phil

[gfinch]

I'd do as Racer :thumbsup: said in conjunction with a Sync & Link. When all that checks out then start searching.

[panther150]

I have an 89 225 evinrude with reeds, gutted airbox and 331490 2.7 heads with the .700 deep chamber witch give 140 lbs compression. I;m running 74d in the top four and 76d in the bottom two with 106 pullover tubes and 16 degrees timing. No bog and it goes like a bat out of hell out of the hole. I think you are very lean. Be carefu; as these motors don't run very long this way. Pm racer for setup, but I would jet up and back off the timing if you're running pump gas.


Steve

[phil blomquist]

thanks to all plugs are wet still running stock air box 92 octane fresh gas just ran once with 2.7 heads 1 through 4 has 62 d 5 and 6 64 d might go richer on idles but for sure before i go out again gonna index flywheel check all timing cylinders this ignition is off 87 2.7 does anybody know for sure if it has faststart? thanks again phil

[panther150]

thanks to all plugs are wet still running stock air box 92 octane fresh gas just ran once with 2.7 heads 1 through 4 has 62 d 5 and 6 64 d might go richer on idles but for sure before i go out again gonna index flywheel check all timing cylinders this ignition is off 87 2.7 does anybody know for sure if it has faststart? thanks again phil
I would at least install some pullover tubes. They richen the midrange and top a bit and install in the hole right at the bottom of the bore in the centre above the fuel bowl. It only takes five minutes to push a set in and they are cheap insurance.

Steve

[phil blomquist]

hey steeve thanks for that i will do that on the search engine now i remember al giving that part number on another post so ill try to look it up thanks again phil

[panther150]

hey steeve thanks for that i will do that on the search engine now i remember al giving that part number on another post so ill try to look it up thanks again phil
NP Phil, the part numbers for the pullover tubes is :322812.

Steve

[racer]

If you installed 2.7 heads you need to richen up, stock jets are 62D but with added compression you need to go up 2 and installed 322812, this will be safe until you find your problem

[phil blomquist]

figured that once i did the compression test messing with fire you can get burned will wait till i get the pull overs thank you Al just seemed so wet in the holes like she was way to rich did a little experimenting for a little bit didnt cure my bog though so back to figuring thanks for all the support your advice gives me hope one day everything will come together thanks again phil

[phil blomquist]

got home tonight indexed fly wheel checked all cylinders 18 degrees great spark on gap gauge 7/16th. nice blue flame made me kinda happy will wait for pullovers was thinking trying 64d up top 67d bottom 2 thanks for the help will keep you posted phil

[MTHydrostreamGirl]

Gosh Phil, this is a hard one. Previous owner blew up way too many times. Try a merc ...

[phil blomquist]

i really need some advise on here this thing is driving me crazy still have not figured this bog out of hole problem any ideas would be great feeling like i missing something after i finally get it on plane it runs flawless thanks phil

[seahorse]

89 evinrude 225 pulled plugs noticed #1 is alot leaner than the others running 62ds in top 4 holes 64ds in the 5 and 6 any suggestions what would cause #1 to be leaner thanks ahead of time phil



pulled the heads yesterday...it was # 2 hole that looked cleaner than others .


If it really was #2 cylinder that was running leaner than the others, check the upper main bearing bolts and seal, along with the lower main and the hose and checkvalve between them. #2 intake manifold provides the vacuum for the lower to upper main bearing recirculation system and any leakage makes that cylinder run lean. Many folks will richen up #2 to prevent premature failure. A leaking bottom crank seal allows water in and that will migrate up through the top bearing and into #2 cylinder. Keep that in mind if #2 ever shows signs of water intrusion.

Installing richer jets in #5 and #6 was from a service bulletin back around 1990 that said to help out the engines for breakin. It mentioned, if I remember correctly, that richening them was not needed if the motor already had some time on it.

[phil blomquist]

i was thinking of checking the recirc hoses last night funny as you have mentioned it make sure of proper routing got dark on me so i will do some prodding today thanks