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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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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Just had a top end overhaul but when I drive 3 kilometers it will overheat? pls.. help...

Hi, Anonymous you need to follow proper break in procedures otherwise the usual suspects are:
1. Engine oil level and SAE weight are too low or not circulating.
2. Insufficient or blocked air flow over the engine.
3. Heavy combustion chamber carbon deposits.
4. Ignition timing retarded due to faulty MAP, CKP, or CMP sensor.
5. Carburetor jetted too lean.
6. Leaking intake or exhaust valve.
7. Water coolant old or low change every two years.
8. Water pump failure.
9. Radiator clogged, cap loose or malfunctioning.
10. Radiator fans not coming on.
11. Clutch slipping, brakes dragging, heavy load, towing a trailer etc.
12. Idling too long without moving.
13. For constant hot weather temperatures, mountain, or desert riding conditions consider adding an oil cooler and or cylinder head cooler.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
How to break in your new motorcycle the proper way Helmet Hair Motorcycle...
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Bmw r1100r

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

Mar 21, 2014 | 2000 BMW R 1100 R

1 Answer

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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1 Answer

My 2008 Sherco Trials Bike has milky oil in the engine/******. What could be the cause besides the obvious water in the oil, how is it getting in there?

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.
Hope that helps you out.
Thanks for asking FixYa!

Aug 10, 2011 | 2008 Sherco 32 4T

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Rebuilt top end twice water was leaking into oil so striped it down put new gasket kit in still got same problem

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

Dec 21, 2010 | 2003 Suzuki RM 125

1 Answer

My 1991 rgv 250 is blowing white smoke that smells like petrol and running odd at high revs

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.
DON'T CONTINUE to run/ride the bike until you fix this situation as it can blow your engine with all that water in the cylinder.
Check the oil... does it look milky or foamy... that would be confirmation that you for sure have a coolant leak into the engine. But you still could have the coolant leak even if the oil looks fine.
You can replace the head gasket if you can still find one available (you bike is a "vintage" machine for sure!) or may wish to find a motorcycle repair shop that works on older bikes. You may have to call around... many motorcycle places do not work on older bikes... check your yellow pages or google for vintage motorcycle clubs in your area... you likely will be able to find the correct place through them.
If YOU plan on trying to replace first the head gasket, and then the whole block if necessary, then please repost with that request.
Hope this helps or at least explains what is going on...

Dec 15, 2010 | Suzuki RGV 250 L Motorcycles

1 Answer

Oil leak first three fins down from rear exhaust port. Is this a head gasket leak?

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.

Good Luck

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1 Answer

New exhuast plugs wires jetted carb stilll getting smoke from one pipe ,from front jug ,but bike runs excellent. any ideas

What color is the smoke? If the smoke is white, it's oil smoke. If it's fuel, it'll be black smoke.

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.

If the smoke coming from the front cylinder is white smoke, you may have a oil problem. It could be rings, a valve stem seal, or a head gasket leak. But, unless the smoke is heavy and the bike runs good, I wouldn't worry about it. If it bothers you, have a leakdown test run on the engine. That should tell you where the problem is. Or, just do a top end overhaul on the engine and be done with it. Have a new set of rings installed or have it bored and new pistons if needed. Also have a valve job done on the heads. This should solve the problem as you'll have to replace the intake gaskets when you take the intake and heads off.

Don't just keep throwing money at the problem. That gets expensive and is only successful part of the time. Anytime you have a problem with one cylinder only, whatever is wrong is confined to that cylinder. Anything that you do that effects both cylinders is usually useless. I would suspect a valve stem seal on your bike. You didn't say how many miles you have on the engine nor what type of carb you're running.

Good Luck

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