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TOO Much Smoke

GOOOOD!!!
You have not stated

GOOOOD!!!
You have not stated which shaft length you have but given a 20" and 92 model.
In an earlier posting you have stated you have following jets:
Idle air : 37
Interm (air) 43
According to BRP it should be 32 and 28??
No wonder you are 'drowning' unless you are at the top of Mount Everest.
 
"You know, I was looking at th

"You know, I was looking at the BRP parts pages...and studied all the varying carb/model number choices.
Those orifices differ widely among models for 1992. Even the CR model has a different set of orifices...why I don't understand.

Nick...you better get the numbers off the carbs and start comparing....

By the way...each jet is about 7.70 from BRP."
 
"Dough:
The reason there are

"Dough:
The reason there are different jets for stb and port are the same reason that you get different comp readings on stb and port bank. Run the ENGINE counter, and you have the opposite result!
One has to be extremely careful with some of these engines as they are tuned on the limit TO AVOID SMOKE!!!"
 
"Year model stuff is part of t

"Year model stuff is part of the problem, my shaft length is 25 in (for a 98 year model) however my power head is not the original to that motor( I have narrow it down ton 88-92 year model), so I’m having really bad time trying to figure out the parts I need, but correct me if I’m wrong smaller jets would mean less air... implied more gas/running rich right???, I'm at about 3500 feet, but even when I take the boat to the ocean (The Pacfic) it smokes the same, Dough thanks for the offer, but intermediate jets would not make the difference at low/idle right???"
 
"Just put the set of 225 carbs

"Just put the set of 225 carbs on that I pointed to on ebay.
That is the only difference. Makes it a 225.
The venturis are about 1/4 inch bigger, and the HS jets are like #72s. (This from memory.)
You would then have the idle mixture adj screws that you don't have now, EVEN THO I DO NOT RECOMMEND THAT YOU MESS WITH THEM.

All I can offer is the #27s for trial."
 
"I’m about to check my recircu

"I’m about to check my recirculation hoses, I’m only running at about 4000 RPMS even after dropping from a 19” pitch prop to a 17”, I also raised the motor about 1” on my transom bracket hoping for improvement of the RPMs @ WOT, plugs are wet and motor still smokes like a coal train at low RPMs, I see oil/gas stains in the water while idling at the dock which is a sign of running rich, is there a possibility of something been wrong with my throttle plates??? Is there anything in there that could be causing the motor to run rich? I took the air silencer off again to test and see if the motor would rev up any higher w/o the cover @WOT and it does get me to higher RPMs so I know I’m chocking from idle thru WOT but man I have no idea of what to do any more…
Dough, correct me if I’m wrong smaller low and intermediate jets/orifices would mean less air... implied more gas/running rich right???"
 
"Those idle and intermediate j

"Those idle and intermediate jets are air orifices...so, smaller orifice, less air, and if gas amount remains constant, the mixture would be richer.
The main jet is a fuel orifice, so it behaves opposite...bigger jet, more fuel, richer running.

I think I am going to jump on those carbs on ebay....but with a "best offer" type of deal...
I will let you know, and if I get them, they will be here if you decide to upgrade.

Nick, did you pinch off the fuel line feeding the primer solenoid like I suggested? Free test, simple to do, lightly pinch it with a small pair of vise grips, so no fuel can flow. This is AFTER you get it started and warmed up of course. Otherwise you would probably not get it started. Run it looking for excessive fuel and smoking after it is pinched off. If that primer solenoid is leaking....you have constant raw gas pouring into the back of the intakes ALL THE TIME."
 
"Well....I may have to retract

"Well....I may have to retract what I just said.
I just pulled a carb apart to study the innards.
I see two fuel pickup tubes extending from the venturi body down into the float bowl for fuel pickup. One is a large plastic tube, and the other is a tiny brass tube. The brass tube feeds gas to the intermediate circuit which is behind the side plate, and the large plastic tube feeds gas up to the opening in the middle of the venturi.
So, it occurred to me that it COULD work the same way that the large tube supplies fuel...in that it sucks fuel from the float bowl depending on how much and how fast the air is passing thru the carb venturi.

Consider the side intermediate circuit... if the air is increased by putting a larger intermediate jet in, it could then suck more fuel up that very small brass tube...effectively making a richer mixture at certain RPMs.

So, pull open a carb, study it, and see if you can help resolve this issue. Mort posted above...that with such large intermediate jets you may be drowning unless you are on Mt. Everest..

That would explain it...that the int. circuit works like the main HS circuit."
 
"Right, that would make sense,

"Right, that would make sense, but would not apply at idle or WOT where I’m chocking, at 3200 RPMs the boat feels nice and smooth w/o smoke(Intermediate) but at WOT I can feel as if the motor still has power to produce but it just wont go… I check the recirculation hoses today, the nipples going in to the cylinder head were clear I can push fluids thru it with a syringe, the other fittings that go into the crack case/throttle passages I was able to suck, but not push, good thing, then the 3 way check valve fail the test, I was able to blow thru both intake nipples, but also was able to blow inwards thru the outlet that fails the check valve, I don’ t think that is the source of the problem, how ever is one more thing to be corrected so I will still replace it... do you know anything about that check valve??? Have you run into issues with them???
Also later I will post some video clips of the motor running so u can see the smoke, I change the intermediate orifices for idle ones, increasing size of the orifices from 34 to 47, at idle and on the muffs, it appears as if the smoke issue got better, but I thing it ran lean, as it would sneeze every so often and puff small cloud of smoke in color not black, but brownish."
 
"Guys here is the two video cl

"Guys here is the two video clips see if you guys can detects something, the first one is the one with the #47 idle jets, you can see less smoke than the one on the second clip, however a sneeze followed by smoke can be seen

http://s213.photobucket.com/albums/cc150/fch2cxr/?action=view&current=S3700544.f lv

second clip is the one with the #34 idle jets(orifices) you can see lots constant smoke

http://s213.photobucket.com/albums/cc150/fch2cxr/?action=view&current=S3700543.f lv

any ideas???"
 
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