One lean cylinder 1988 90 HP

[reeldutch]

Re: One lean cylinder 1988 90 HP

im joking sorry if you picked it up wrong.
im happy were all thinking the same.
lean at idle would defanatly make the engine cough and sneeze.
lean at wot would show up in two cylinders on that model motor thats why i think its recirc isseu.
so he should be good to go.

 

[iwombat]

Re: One lean cylinder 1988 90 HP

"im joking sorry if you picked it up wrong."

I wasn't exactly sure, so I covered my a . . .ahem. . . bases.

 

[Dennisanoka]

Re: One lean cylinder 1988 90 HP

One hose comes off near the #4 cylinder, one comes off near the #1 and one off the bypass cover on the #1 side. The last two mentioned get tied together on my engine. The engine runs much much better now that the fuel pump(VRO) was replaced. #4 fouling out was creating a real problem. If I am not getting fuel out of the hose when I pull it on #1, besides making sure the hoses are clear what is the accepted method to test the valve itself? Do they need to be pulled out? They pass fuel in one direction and not the other correct? I just want to do this one last thing and then call it a day. Sorry foe being a pain in #$#%@.

 

[reeldutch]

Re: One lean cylinder 1988 90 HP

you can screw them out and blow some air trough them.
i just clean them and stick them in my mouth.
no need to pull the ones from the bypas covers
just blow air trough them.
the ones on the crank case are the important ones.

good luck

 

[Dennisanoka]

Re: One lean cylinder 1988 90 HP

Thank you I will post the results. I've appreciated your help I hope you don't mind if I violate a rule and ask a unrelated question. My son just brought home a 1941 Champion but the plug is almost as old. It's a Champion H-9 Com any suggests for a modern one?

 

[Dennisanoka]

Re: One lean cylinder 1988 90 HP

I hope I can communicate this clearly. When I pulled the recirc hose from the #1 cylinder bypass cover it only drips fuel out so then I pulled the one from the #4 cyl. bypass cover and it shot fuel out just like described. So then I went back and pulled the one from just in front of the one on the #1 side ( on the side of the crankcase, but towards the front)and it shot fuel out like #4. Soooooooo, I'm am quite concerned that I have them reversed on the #1 side. Hope this made sense.

 

[Dennisanoka]

Re: One lean cylinder 1988 90 HP

I will be tempted to "assume" that I had the two recirc hoses on the right side of the crankcase reversed and give it a try. It would seem to be logical based on what I have seen so far. Or at some point maybe I can find another engine to compare to, if I don't hear back on this site.

 

[Dennisanoka]

Re: One lean cylinder 1988 90 HP

At this point the #1 cylinder is just going to remain a drier looking plug than the rest when idling. I did pull both carbs off, recleaned every port and jet and orifice with wire. Pulled each recirc valve and all pass the "stick em your mouth and test method". Tried each hose, all clear. Put it all back together and it's exactly the same. I will go by the plug's appearance from here on out on this one, provided it and the others stay light brown I'm going to accept this condition. I have also recently installed a temp gauge on the #1 cylinder so if it were lean I'll have a monitor. Thank you all for your assistance and patience. It wasn't a waste of time though, I know more than I did before.

 

[iwombat]

Re: One lean cylinder 1988 90 HP

The tiniest little nuance in the combustion chamber can change the whole characteristic of the flame front and combustion geometry. Could be you're just getting a more complete burn near the plug because of one little chunk of carbon in the right place. Might be a totally different story on the other side of the combustion chamber.

And so it goes.

 

[Dennisanoka]

Re: One lean cylinder 1988 90 HP

I also know that I became much more aware /concerned over every little sound and spit or possible sputter after the re-build. I wouldn't be surprised if it runs alot better now than it ever did before.

Thanks again for you help. The VRO leaking fuel back into the #4 cylinder and fouling it out was a huge break through. I never would have found that without this forum.

 

[reeldutch]

Re: One lean cylinder 1988 90 HP

sounds like you have peace of mind.

trust me you will build more confidence in the motor the more you use it.

just check the plugs after 10hrs of use.
that will tell us more.

i'm pretty shure you will be fine.

what brand oil do you use if i may ask?

good job on the temp sender.

the gauge that i always look at the most is my rpm gauge nr1
water pressure gauge nr 2

if you see your water presure drop suddenly that is caused by a plastic bag or something blocking the water intake you will see it before the engine overheat alarm will go off.
waterpressure drops faster than the tempwill raise.
you can tap it from the block or t it in from the tell tale.

just some cheap insurance for your rebuild investment.

 

[Dennisanoka]

Re: One lean cylinder 1988 90 HP

I had been using Sierra oil then I bought Evinrude XD25. I did a bunch of searching here but there didn't seem to be a clear consensus. The cost is not an issue since the cost difference based on the amount of oil used in a year is not a huge number. Suggestion???

 

[iwombat]

Re: One lean cylinder 1988 90 HP

Reeldutch, this thread was going so nicely. Why, oh why did you have to open up the door to the oil discussion?


Here we go folks . . .

 

[reeldutch]

Re: One lean cylinder 1988 90 HP

its a personel preference.

i think the BRP oil is fine.

i run all my motors on Yamalube 2m.
i never head a problem.
after the season i will do a decarb the day before my last trip, i use yamaha ringfree.
than i let it sit overnight and blast off the next morning in the bay.

i'm not a oil sales man.
but i have bad experianse with the cheap oil that you can find here and there.
not anymore for me. i stay with yamalube until one of my motors will have a oilfailure or havy carbon buildup.

 

[Dennisanoka]

Re: One lean cylinder 1988 90 HP

I ran across those oil discussions.

Thanks for helping and thanks for caring.

 

[reeldutch]

Re: One lean cylinder 1988 90 HP

i hear you

 

[Dennisanoka]

Re: One lean cylinder 1988 90 HP

Just so you know since this engine is ready to go, tomorrow morning about 9 it's pulling outa Dodge and headed north with me and 2 of my sons for the next 4 days to a lake in the middle of nowhere so if I never post again it's because the fishing is really good. (Oh I just remembered we'll have to come back when it freezes over.)

 

[iwombat]

Re: One lean cylinder 1988 90 HP

No problems

- Internal Combustion Care Bear

 

[reeldutch]

Re: One lean cylinder 1988 90 HP

good luck.

not that you need it.