Question about Stihl Chainsaw Cutoff Saw Flywheel 08 S Ts350 P835

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Does carb work under crankcase pressure cause petrol coming out of carb when engine stopped,

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If the unit is leaking fuel out of the carburetor when the unit is not in use then it is usually the needle sticking open. This can be from a piece of grass or other debris getting under the needle and keeping it open. Alternatively it could be a bad diaphragm that is leaning on the needle and keeping it open.
As always it is recommended that you take the unit to a Stihl dealer with a Gold Certified Technician for parts and repairs.

Posted on Mar 30, 2011


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1 Answer

Oil leaking into carb

All Harleys will get a little oil in the breather.

However, when mileage causes the rings to wear, combustion pressure can leak past the rings, causing higher pressure.

You didn't state your mileage, but at 11 years old, your engine might be ready for a top end rebuild.

Mar 22, 2014 | 2003 Harley Davidson FLHTC Electra Glide...

1 Answer

Cub cadet 1440 oil all over engine, in carb, and plugs come out black with oil all over them

Is it coming from the Breather hose? try taking out the air filter and see if that stops it. If air filter is clogged , it will cause Crank Pressure.
Also check oil level if too high it will do this. Sometimes the carb will let gas past and into crankcase filling teh crankcase above 'Full' mark

Sep 25, 2013 | Cub Cadet Street Sign- tractor lawn riding...

1 Answer

Breather tube throwing oil into carb

Oil coming via the engine breather can mean a worn engine, it could be as simple as an over filled sump, or the breather valve itself is not working, the breather valve allows the crankcase pressure out of the engine.

Apr 20, 2012 | Cub Cadet Garden

1 Answer

86 harley oil leaks out carb when you start it

Your crankcase vents into the carb air filter. This was required by the EPA. All crankcase vented pressure has to be cycled through the engine. So, If you'll look behind your air filter to the rear of the bike, you should see a pipe coming from just behind the oil pump up to the backside of the air filter. The air pressure exhausted from the crankcase has an oil mist in it. There are baffles in the pipe but sometimes during servicing, these baffles get left out. Still, even with the baffles, there is some oil mist that makes it's way to the air filter. This oil builds up over time and causes a drip out of the air filter. Regular cleaning of the air filter assembly reduces this.

If you're getting more than the usual amount of oil, your engine could be "oil sumping". This is where the oil in the oil tank seeps past the check ball valve in the oil pump and builds up in the bottom end of the engine. When you start the engine, the oil pump cannot pump it back to the tank fast enough and it's blown out the crankcase vent tube right into your air filter. You can "reseat" the check ball and may be able to get it to stop doing this.

Or, you could remove the crankcase vent tube going up to the air filter. Put a piece of tubing about six inches long on the nipple coming out of the engine case and plug the hole in the backside of the air filter backing plate. Then, the oil will directed onto the ground instead of into your air filter.

Good Luck

Aug 19, 2011 | Harley Davidson FXR Super Glide...

2 Answers

1994 Chevy silverado 6.5L turbo diesel: My oil pressure is between 40-60 for the first few miles on the road. then drops and seems to hold steady at around 40 while my foot is on the gas, then drops...

I'm not sure why you want to change the oil again. Your oil pressure numbers appear to be normal. Replace the oil cap if it's bad. You'll have to scan the ECM for codes to find out why the the check engine light comes on.

Apr 15, 2011 | 1994 Chevrolet Silverado 2500

2 Answers

Vauxall zaffira petrol engine 1.6...put to much oil in engine,got it drained and refilled about 4 days later,was told it would stop smoking after a couple of days which it did,cars performance is no where...

may take about 100 miles before things get back to normal,if the plugs got oiled,try adding petrol additive(injector cleaner)in 5 gallons of petrol and you may be suprised how much smoke you kick out...(oil in exhaust system).

Jan 09, 2011 | Volkswagen New Passat Cars & Trucks

1 Answer

My 1999 Harley FXD makes a scraping noise and seems to loose compression and stalls at idle only. Noise seems to be coming from the top of the front cylinder. Runs fine under load. I removed rocker cover...

The "scraping noise" is the crankcase vent venting the pressure out of your engine as it runs. In 1994, Harley moved the crankcase vent to the heads with is why most mechanics referred to bikes of this year model and later as "head breathers". The two large bolts that hold your air filter onto the engine's heads are hollow and that's what the vented air comes through. If you've replaced your stock air filter with a SE or aftermarket unit, you may be able to hear the vented air better due to the reduced restriction of the air filter.

Now, excessive crankcase pressure will increase the noise that you're hearing. This is caused by ring blowby is the rings are worn. My suggestion would be to have a compression or better yet, a leak down test done on the engine to determine the condition of the rigns. It may be time to replace the rings.

As for the stalling, I doubt that it's loosing compression. It's probably the idle speed is adjusted too low or the carb needs going through and a bit of tuning done to it.

If it''s fuel injectied, you'll need to take it to a shop that can reset the idle speed and such as it's all done electronically.

Good Luck

Oct 15, 2010 | Harley Davidson FXD Dyna Super Glide...

1 Answer

I have a 04 night train with carb and it does back fire and then there is a mist of oil that spill out of my air filter.

The backfiring though the carb is probably due to a lean mixture. The carbs are jetted extremely lean to meet EPA emissions levels. Also, the crankcase pressure is vented into the air filter to be recycled though the engine per EPA requirements. The same thing as the PCV valve on your automobile engine. When the engine coughs, it's will blow out a mist of oil because of this.

Now, you can have the carb rejetted to richen the mixture. I'd go up one size on the slow jet. Also check to make sure the accelerator pump is working properly. With the engine OFF, the air filter off, crank the throttle to the wide open position. You should see a stream of fuel squirt into the carb from the brass accelerator pump nozzle.

Since the crankcase pressure is vented to the air filter, oil will accumilate in the air filter. You must periodically remove the covers and clean the filter out. There are kits available on the aftermarket parts venue that will allow you to reroute your crankcase pressure away from the air filter.

Good Luck

Aug 02, 2010 | Harley Davidson FXSTB Night Train...

1 Answer

Petrol in crankcase

  • The only way petrol can get into the crankcase is through the carbs and then into the cylinder and past the rings.
  • Drain the gearbox and put in some fresh oil.
  • Turn the fuel petcock to OFF.
  • Drain the carbs then remove the water trap bowl from the petcock. Does some fuel still get past the petcock valve? Replace the petcock if it does. If the petcock is working properly then remount the bowl.
  • From this point forward, ALWAYS shut the gas off when the bike is not running.
  • Please rate this solution as a " FixYa ". Thanks!

Mar 17, 2009 | 1986 Yamaha FZ 600

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