Question about 1991 Suzuki VX 800

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Oil in air cleaner !?!?!

Previously thought oil leak was coming from crankcase breather, but not any more. Started tearing apart and found oil was coming from the rear air cleaner breather. Engine starts and runs great at idle. However, when the rpms are increased it starts dumping oil out of rear air cleaner breather. Pulled air cleaner apart and low and behold, there's a puddle of oil in there. Any help explaining this one would be greatly appreciated?

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Does it smoke at all? It's possible that you have either added to much oil, or you have worn pistol rings and the oil is slipping past the pistons and being forced into your breather.

Posted on Nov 03, 2012

Testimonial: "moving back up the chain to the basics and you were correct, there was a significant amount of excess oil in the chamber; bike still does have a bit of a drip yet but the full fix might have to wait until next season"

  • Snyde Nov 05, 2012

    bike has small amount of white smoke when starting; dumped the cranckcase and there was significant amount of low quality or old oil; far too much oil; rode the bike briefly (it''s only ~30 degrees here) and wasn't blowing oil but still does have a signifcant drip from the air cleaner breather tube.

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  • Suzuki Master
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Firstly check your engine oil level as the most common reason is too much oil in the engine and this is usually due to a carburettor flooding and fuel running into an inlet manifold,passing the inlet valve and piston rings and diluting the engine oil and obviously increasing its volume.i have seen this happen loads of times on lots of different bikes.

Posted on Nov 23, 2015

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Posted on Jan 02, 2017

yvwi
  • 75 Answers

SOURCE: power loss

In the absence of any FI codes/light, my next suspect would be the ignition coils. If the old plugs showed soot on ONE of the plugs, that coil might be your problem. The only reliable check is a spark tester that read the output while the bike is running.

Posted on Nov 18, 2010

mwoodring1
  • 496 Answers

SOURCE: Engine starts and runs great

what kind of bike are we working on?? the avg temp for the elec fan to turn onis around the 220 mark. the best thing to do here is bench test the bike start it up and let it idle, put a fan that moves air in front of the bike, this will help to keep things cool while the bike heats up i know it kinda back-@ssward but do it. a inferred temp gun will help you get the temp, you can pick one up at your local auto parts store. check the temp near the senser for the fan and the radiator itself. keeping a GOOD oil, clean oil in your bike that will help with the cooling as well. If your running a bike with a fuel filter ( If your not GET ONE ) make sure its clean. Bikes with fuel pump, you a two types in tank and external, your in tanks pumps should have a filter on them in the tank, over time they get clogged like a inline filter and can cause poor running as well.
If everything is working as it should you'll need to look into your coils. Heat causes resistance, resistance causes heat and heat causes wires to break down and contact points to to weaken. Coils take alot of abuse when it comes to electricity, it doesn't always happen but it does. coils go out and tire wear odd sometimes.
I hope this helps you out if you need any more help please feel free to contact me
Fix it right Ride it FAST
M.Woodring

Posted on Apr 19, 2011

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1 Answer

Oil coming out of crankcase air breather 1966 electra glide


Hi Anonymous, oil leaking from your air cleaner is caused by oil carryover from the engine. For what ever reason the breather system is not seperating enough oil mist and air from the piston downstroke. There are cheap and quick easy fixes and there are more exspensive ones. Start by trying the following:
1. Run your oil level half way between the add and full mark when hot.
2. Run oil breather lines from head into a TEE fitting below carb/induction module then a single line into a mini filter under frame.
3. Purchase Arlen Ness Super Sucker.
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Oil is coming out of the air beather


This is a common problem. Now the heading says your bike is a 1979 Sportster. Regardless of what it is, there is a crankcase breather that is routed to your air cleaner. This was done to satisfy the EPA regulation that crankcase fumes must be run through the engine to be burned. With the crankcase air come a mist of oil. This oil builds up in the air breather and runs out. You have to clean the air filter out periodically. You can find the crankcase breather hose and re-route it somewhere else so the oil won't go into the air filter.

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Revtech 110 blowing oil out the air filter, I sent my bike in for its first service (1000 Miles) and since the service the motor keeps spewing oil out the air filter... oil level reduced as i thought...


Oil coming out of the breather is normal on these engines by the way of design, with basically no way to stop it. There is about 1/2 qt of oil in the bottom end of an engine, as the pistons travel downwards, the air that is under them is being pressurized and is vented out of the engine by a rotary breather valve in the case. The air picks up a small amount of oil from the bottom end as it leaves, then the air/oil mist is vented either into the air cleaner (EPA Regulations) or best if vented to the atmosphere. When it's vented into the air cleaner, some if it recirculates into the engine and out the exhaust, the rest saturates the air filter and then eventually gets blown all over the side of the bike. The best way to vent it, is to route a hose from the breather system down to the frame between the engine and trans, run it under the bike on the right side, point the hose down to the ground and zip tie it in place...Be sure to point the end of the hose down & away from the tire.
If your breather bolts start to leak oil...remove them, and use brake cleaner to completely remove all oil from them, the washers, brackets and threads in the head. Use liquid teflon thread sealant on the bolt threads, and a light film of black rtv on the faces of all the washers and brackets, install everything, let sit for 24 hours, then ride.......if done properly and rtv is CURED, it won't leak...
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If your engine has been sitting for a long period of time, your engine is probably "oil sumped". Since the oil tank is located higher on the frame than the engine, if the bike sits for a long period of time, oil will seep past the oil check ball and accumilate in the bottom end of the engine. I've seen the oil tank empty into the bottom end.

Now, the engine on your 93 model is what we call a case breather. The engine's crankcase breaker is located on the engine's cases down low. Later models are called "head breathers" in that the crankcase breathers are located in the rocker boxes, up high. So, even though the oil sumps on the later engine the oil doesn't go into the breather AS BADLY as the earlier models but it still gets in there.

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