Vintage Dirt Bike Q & A

my honda is leaking oil out through a gasket next to the oil drain plug any info would be quiet helpfull.

time to rebuild the engine.

I think you are saying there is an oil leak from between the two crankcase halves. As Robbie says, you will only fix this long-term if you take the whole motor apart. This obviously is quite an excercise but would be a good opportunity to check your main bearings, seals, bottom-end etc. etc. If it is only a minor leak you could keep topping the transmission off ad infinitum. If and when you get it apart check the surfaces of the crankcases for any nicks that are causing the leak. No point in putting in a new gasket just to have it leak all over again. If the surfaces are damaged you can have them re-surfaced at a machine shop.

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Michael Stiles
1979 Honda CR250R Elsinore | 2006 Husqvarna SM510R | 2007 Service Honda CR500R-AF

You may just need to replace the clutch cover gasket if it's leaking from there only. Definitely check for nicks on the mating surfaces. A careful hand with a jewelers file can resolve a minor nick.

Torque bolts accordingly if you have a manual. If no manual, torque moderately firm. but don't over-torque. That in itself can cause warpage, cracks, and leaks.

Mike makes a good point - check the clutch cover and also the gear shift lever and kickstart lever oil seals. Sometimes the oil dribbles down and can make it appear as if the crankcases are leaking.

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Michael Stiles
1979 Honda CR250R Elsinore | 2006 Husqvarna SM510R | 2007 Service Honda CR500R-AF