My float bowls are still leaking somewhere just wondering if anyone has had similar problems, I've tried to describe the leaking as best I can with the photo's that Ciaran posted. In this photo its the underside of the carb, the arrow's are pointing at a rough area near the float bowl drain screws, I say rough area becuase I don't know if this is where the leak is coming from. Also note that the two carbie float bowls that appear to leak are the one's that are closest to the ground when the bike is leant over on it's side stand. In the photo I have marked green where it is wet, with fuel. On the 2nd there is more of a fuel/oil mixture in the green area well that's what it smells like, while the first one is more just fuel. Has anyone had a similar problem? or know what it may be?? My step dad thinks that the seat or the screws that close the float bowl drain valve thingy's could be kaput. Sorry bout the picture it aint the best but I tried, it's just generally wet with fuel in the green area.
Sorry haven’t been able to reply for a while (having a few FZR related dramas of my own) Just get some new screws and gaskets. It isn’t going to put you much out of pocket and odds on it will fix you problem. Only other thing it could be is the thread in the bowl itself.
If it was the thread it would be ok but if it was the gate of the valve that was stuffed I wouldn’t risk parts of the tape getting loose into the float bowls, only to clog up something else in the carburettor. When it comes to carbies I have learned never to do things by halves, everything has to be perfect or else you are most likely wasting your time.
Really need help here now, I felt in the same place as I did and there was a lot of a oilier mixture where the green marks are on the above image. like basically straight up oil don't know where that came from cuz oil doesn't go near tha carby part of the engine as I understand it. The bike has smelled a little like fuel/oil lately but there are never any leak marks on the ground and I would know I park the bike on white sandstone tiles.
Did you try the plumbers tape? You only need some around the top of the screw. No tape should get into the float chamber. Dry the area and take out the offending screw to see if its wet with fuel. Also take out the drain screw of the carb that is not leaking and compare screws. If you cannot see anything swap the screws from the leaky carbie to the none leaky one to see if that leaks.
I think the first step is to solve the leak. Get that solved, then drain the float bowls and check the fluid to see if its petrol/oil or just petrol. Or you can drain the float bowls of the none leaky carbies and check the fluid from them to see if there is oil.
I've drained the float bowls before on a seperate occasion and it was just pure petrol no oil. Could the oil be coming from somwhere else in that region?
It's probably from a leaky intake boot if its oily. Or you might have heaps of oil blowby past the rings and need the whole engine rebuilt, the head reconditioned, new valve keepers, valve guides and a new cam chain for the sake of it. Like I said I would clean the carbs up with degreaser, dry a pollish them, plumbers tape the drain screws and go for a ride. Then report back. This might cost you $2.50 at the most and will rule out lots of causes. Alternatively spray some WD-40 around the intake boots while at idle and if the engine responds you have an intake leak.
yeah it's black smoke but only at revs over 12000. Reckon I should turn the mixture screw a quarter of a turn back down? clockwise for less mixture and anti-clockwise for more fuel yeah?
Mixture screws are usually only the adjustment for idle mixture, best left alone. Check the air filter to see if it is in need of replacement or cleaning. It may be restricting the air flow and making it run rich. DAVE
Time for a carby tune i reckon. One of the cylinders is probably getting dumped with obscene amounts of fuel causing the black smoke.
Have the carbs checked out in regard to needle wear and the vacuum working properly. Then about all you can do is check that the main jets to see what size they are. Some clown may have had the bright idea that it needed bigger jets somewhere along the way.
