Question about Yamaha 2006 RS Venture
Even when the oil is down oil spurts from the oil tank into the air box for the carbs. The oil tank has two tubes (one 5/8 and one 1/4)that run up to a valve that has one 5/8 tube running to the air box. The 5/8 tube from oil tank is the one that brings up the oil to the valve. The 1/4" has positive air pressure and also runs to valve. Any suggestions??? 1000 cc engine has 135-145 dry compression.
Common problems that can cause this is to much oil. engine veins blocked or the rings on the piston are gone and the back pressure from ignition creates an overflow of air into the system.
Posted on Aug 08, 2017
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Posted on Jan 02, 2017
SOURCE: oil shooting in to the air box
From your brief description I'm guessing a high mileage machine? or Previous owners have revved too much from cold?
It sounds like the engine is possibly breathing? the pistons and compression rings are worn so exhaust gasses and compression leaks past them and pressurizes the crank case sending oil out the breather, so the air filter draws it in.
If the bike is performing o.k. and you can live with it try a dribble/breather can? pop the vent pipe into a seperate container to catch it. Make sure you seal the hole in the air filter so contaminents can't get in. also the new breather needs air circulation so trial and error on a recepticle.
Paul 'W' U.K.
Posted on Jan 08, 2009
hi 81 yamaha i am concerned about the fuel smell coming out with the oil. could be the carbs flooding filling your crankcase with fuel? if not it sounds like you have blow by which would cause your crank case to be slightly pressured. this is caused by worn piston rings. do not plug your crank vent. if you leave your vent open install small filter to stop dirt from entering jim
Posted on Mar 26, 2009
yesi have a yz 125 2000 and iv had the same problem to i have bin working on it for a week now and the problem is that my head gasket had blown and the comprecion from the piston was forcing the water thru the seal in the water pump be hind the little propeler in the water pump and it had gone into the clutch and when water,petrol.oil is mixed u get a grey gloopy sorta sludgy mix.drain all the oil out of it an see if there is any water bubbles in it. if not u have run the poor bike so hard u have boiled the oil just drain it and replace it.hope i helped u.
Posted on May 07, 2009
The idle problem is a lean fuel mix caused by an air leak in the intake system. Bad gaskets /seals on the intake manifold, bad valves, bad piston rings, loose spark plugs, and bad head gasket are all things that can lean the fuel/air mix. The smoke indicates a need for new rings. I would have the cylinders bored then install new pistons and rings. Now finish the top end work by getting a valve job. You should get a liquid fuel tank liner to eliminate any rust problems in the future. Also, install an in-line fuel filter.
Google “ kreem fuel tank liner “ or go to www.http://www.4secondsflat.com/Fuel_Tank_Sealer.html
My complements on the well cleaned carbs. Do the work mentioned above an you will effectively have a new engine.
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Posted on Jun 11, 2009
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