Question about 1981 Yamaha XJ 650

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When warm will not stay running+leaks oil to the air cleaner

My dads 81 650 special will not stay running when its warmed up. Its like its losing spark maybe? Also leaks oil through the carb into the air cleaner on left carb and a little oil out the clutch cable hole.

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This is an XS 650, no? Sounds like you might have some piston ring blow-by (especially if its burning some oil), or possibly bad valve seal's'. The valves could be tight, so make sure the valve clearance is correct first, then compression test, and finally a 'leak-down' test.

If it is blowing by, it probably is fouling plugs and you will need more energy in the spark to fire, but this is a secondary issue, which will be eliminated with the fixing of the other issues. Good luck!

Posted on Jun 25, 2009

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Posted on Jan 02, 2017

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What's leaking oil ?


Don't know make or model. Don't know mileage, many open questions, but the higher you go on an engine, the less possibilities for leaks. Check the valve cover gasket. If it is bad it will leak and probably give off a smell too as it will burn on the exhaust.

Feb 14, 2016 | Cars & Trucks

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Revving when warmed up cold its fine


air leak on the intake the gasket may be leaking. sometimes just needs the top bolting back down.... letting more air in than needed. vibration can cause the bolts to come lose.

Dec 06, 2013 | 2005 Mitsubishi Endeavor

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My gsx600f runs great on warm up but when its all warmed up it starts to backfire & then dies...i had carb. cleaned,replaced plugs also air cleaner & changed oil please whats next to check?


I would look at the intake boots, make sure there are seated and look for degradation of the rubber. If you can spray some carb cleaner around the intakes and listen for an increase in RPM's which will identify a leak. If it is backfiring through the exhaust upon decelleration it would indicate a lean condition, or if it backfires through the airfilter upon acceleration it would also indicate a lean condition. both of which could be an intake leak.

Jul 24, 2011 | 1993 Suzuki GSX 600 F (Katana)

1 Answer

When engine is trying to start or running oil leaks out carburator area. doyou have video for step by step


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.

Look on the back of the air breather assembly. There should be a pipe coming from the front of the engine on the timing gear cover on the right side of the engine going to the back of the air cleaner. Temporarily disconnect this pipe. Start the engine and allow it to run for a few minutes. Once the oil stops coming out of the pipe, reconnect it and disassemble the air cleaner. Clean the air cleaner. If the paper air filter is saturated, replace it. Reassemble the air cleaner assembly.

Now, Check the oil. Do not add oil to the engine as long as the oil is visible on the dipstick. Start the engine ride until the engine warms up. Now, with the engine warm, check the oil. The upper line is "Full Hot" while the lower line is "Full Cold". Set the oil level halfway between the lines. Do not overfill. If the bike is going to be sittting for a while, either drain the oil tank or start the engine about once a week and let it run for a few minutes. Do not allow it to overheat.

Good Luck.
Steve

Jun 20, 2010 | 1993 Harley Davidson FLSTF Fat boy

1 Answer

1998 chvy 1500 loses power


check the intake gaskets. in the middle front and middle rear. If they are oily, it more than likely sucked part of the gasket in. When it warms up the leak gets bigger. The easy way to check is to get some carb cleaner and spray all around the intake while idling and warm. DO NOT SPRAY ANY EXHAUST PARTS , carb cleaner is combustible. The truck should stumble or even shut off when spraying with the carb cleaner if there is a leak.

May 03, 2009 | 1998 Chevrolet K1500

2 Answers

1992 gmc chevy 350 wont idle when warm


This could be a number of things but i think that your problem sounds like a vacuum leak or an EGR problem. Try listening for leaks and try un-plugging the EGR solenoid valve one time.

Apr 09, 2009 | 1992 GMC Sierra K1500

1 Answer

Home heating problem


You need to have your ducts balanced. It takes special equipment and expertise. They block some and open some ducts so the air flow is even throughout! You could just partially block or close the vents in the center and you might get more heat in the end of the runs. Also if the ducts are running in unconditioned air, like under the house or in the attic. You could be losing heat by not having insulation on the ducts. Try wrapping them.
Hope that helps.

Jan 17, 2009 | Heating & Cooling

1 Answer

Engin dies after warm up then, hard to restart, will not stay run


use carb cleaner to trace remaining vacuum leaks .spray while running around plenum and hoses..engine will get happy when it sucks in carb cleaner.. that will allow to find leaking area ...good luck

Dec 17, 2008 | 1990 Toyota Pickup

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