Question about Yamaha SR 400 Motorcycles

1 Answer

Oil is leaking between the cylinder head and block.

Can't overhaul because i'm afraid there are no parts are avialble. Pls. help. It's a nice bike.

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  • Jim London
    Jim London May 11, 2010

    Hi, The SR400 is pure Japanese and the parts are hard to find. Sounds like you need a new cylinder gasket. Are you going to do the job yourself? If you are then the way you could do it is with a gasket repair or gasket forming material. I have done this with old tractors. If you aren't then use a google translator to find a Japanese site for parts. If you need help with gasket material let me know.

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  • Master
  • 653 Answers

If it was a valve cover I would say go ahead and try the RTV or other gasket forming material. For a head gasket, you are looking at a gasket that usually has copper or aluminum and other sealing material. Anything else just won't cut it. The internet is a wonderful place to find obscure parts and minutiae.

Posted on Feb 25, 2009

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If the rings are worn, you'd be getting blue smoke out of the exhaust, and a loss of power. More likely you may need a new head gasket -- is the leak coming from around where the engine block stops and the the cylinder heads start? Or you may need new oil seals around the camshafts. Clean the oil off carefully, take a short speed run, and see if you can pinpoint where the leak starts from

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I have a 99 ktm 250 sx. Had to get cylinder replated and a new piston. I put the bike back together and oil was leaking from the front lower end of the cylinder and i wont idle. Took the bike back ap


If there is a leak in the head gasket it will never run properly. Maybe the carburetor is plugged if it has sat for a while. The gas/oil mixture can go bad over time. The leak could be from a loose gas line. Or possibly even oil dripping from the oil filter if you just cleaned and re-oiled it.

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That means the blown cylinder gasket and you have to pull down the head and piston block.
Install a new gasket for the head and base of that piston block.
Water begun to leak out from the water jacket seals and into the crankcase. This is cause by overheating or you hit some hard object to the engine block.
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There is an oil leak around the bolts that hold in the top exhaust pipe where connects. I am new to the bike but know previous owner and they tell me there has never been an issue. The bike has sat for...


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The oil you are seeing may very well be from the bike sitting. I have worked on many bikes that have had similar problems. The oil bypasses the rings and gets forced out the top of the cylinder. Once the bike has been used for a couple of days, sometimes a few days longer, the rings expand sealing the cylinder and thus no more oil. It would be a good idea to examine the cylinder bolts too to make sure that the oil is not leaking from the cylinder head.

When a bike, or any motorized vehicle or tool, sits for an extended period of time, parts that are supposed to be lubricated by the motor running will dry out or shrink. This can cause a decrease in engine life and costly repairs. Always try to start your bike, even if you don't ride it, and let it run through the warm up procedure everyday.

Even if the oil leak stops on your bike, you should still have the exhaust leak fixed. Grab the exhaust pipe, when cool :o), and see if you can feel any slack by pulling on it. I would spray a penetrating oil on the bolts, let it sit overnight, and then try to tighten, or replace, them yourself.

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If it got realy hot you may of warped the head or cracked the cylinder. Do a compersition test to see how much pressure you are looseing. High would be the head witch would be easyer and cheaper to fix low you may need to replace the cylinder

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1 Answer

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I think your model is a water-cooled model with a radiator. Likely you have a leak in the head gasket or (hopefully not) a cracked block that is letting the coolant into the engine cylinder making all the white "steam" and stinky exhaust as the coolant burns.
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1 Answer

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Sounds like it. You didn't say what year model your bike is. If you hear a popping noise in this area when the engine is running cold, you can probably see a bit of flame in the dark. In 1998, Harley came out with a new type of cylinder stud that doesn't stretch as much and when it does, it contracts back to the original length. When you overhaul the top end, I'd suggest using the new studs. You can tell the new ones because the "fat part" is at the bottom of the stud instead of at the top like the older ones. With the new studs and allowing the engine to warm up before taking off, you won't lose anymore head gaskets.

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1 Answer

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Generally, black smoke from the exhast indicates a too rich mixture for one reason or the other. You said you rejetted the carb. This could be part of the problem. You also said that it's only out of the front pipe. If you rejet the carb, it effects both cylinders. If you have a vacuum leak on the rear cylinder, this could cause the front cylinder to run rich.

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Steve

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