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Post by leonbee on Jan 17, 2006 1:09:53 GMT -5
Hello, new guy here, from Arkansas. I know a lot about British bikes, not very much at all about Yamahas. My friend has an SR500- not sure what vintage- I've ridden it and am getting interested. Beginning to understand their appeal.
Now the motor is out and on the bench because of smoking problems I didn't personally witness. Not really torn down yet. My friend had a conversation with someone knowledgeable who told him it sounded like wet sumping. I know where to look on a Triumph or BSA: check balls, weak springs, worn pump, etc. We'd be very grateful if anyone here could share some wisdom in this regard. Thanks!!
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Post by StewRoss on Jan 17, 2006 2:42:38 GMT -5
Hi,
Not sure about this wet sumping stuff, but I do know that the SR's can tend to have problems with valve stem seals.
If the bike is blowing smoke on start up and after a period of trailing throttle, go for the seals. Never use aftermarket seals in these, they never seem to last.
If you're familiar with Brit stuff then you may know about the 500 Matchys and AJS's...leave them for any period of time and then you need to drain the sump and pour it back into the oil tank again...
SR
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richf
New Member
Posts: 1
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Post by richf on Jun 8, 2006 9:53:08 GMT -5
Hello, I just joined the forum. I've got an 81 SR500 that I bought new in April of 82. Regarding "wet sumping", here goes. On a bike like the SR500, which has a separate oil tank, the sump in the bottom of the crankcase is designed to carry only a little oil. The bulk of the oil is stored in the oil tank. In the case of the SR500, the oil tank is in the frame backbone. To keep the oil in the tank and not allow the oil to leak down into the sump (crankcase), there is a check valve somewhere in the system. This valve usually consists of a ball and a spring. When this valve fails, the oil contained in the tank will leak down and fill up the crankcase (sump). That is called "wet sumping".
My bike is wet sumping. When you measure the oil level in the tank, you read zero. However, draining the oil from the bottom of the engine, you get about two quarts out. The oil is there, it's just not where it should be.
I have not located the valve yet. I have three different repair manuals (Yamaha, Haynes and Clymer), They reference the check valve pressure, yet none show where the valve actually is. If anyone can tell me the valve's location, I'd be appreciative.
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Post by sjef on Jun 8, 2006 10:07:20 GMT -5
richf
remove the rightside enginecover turn it around and you will see a little rubber with the ball in it
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Post by miker on Jun 15, 2006 9:53:32 GMT -5
Mine smokes if I don't ride it for four days - that's how long it takes enough oil to drain into the sump to cause the problem. So I'll just ride it more, and fix it this winter!  miker |
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