nsr 125 urgent help needed

[oneofakind]

hi all i dont really no much about these 125 2stroke so i need abit off help

my nsr runs and rides mint but a oil has arisen

it seems to be coming from a overflow pipe but ive traced the pipe back and it goes in to the crankcase so i think its a breather hose im not sure but what up with it i dont no how to stop it from leaking cuz i dont no whats up so any help would be great

ive attached a pic ithe the pipe my screwdriver is touching not very good pic not alot of room
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supermotos all the way :p

[Fidge]

Have you done anything to the bike? any idea what caused the leak?

[salem1987]

changed the gearbox oil recently? If its too full im assuming itll come out of the breather when the gearbox internals are splashing it about.

[oneofakind]

ive not done anything to the bike

and its not overfull on gearbox oil

the oil leaking out smells like 2 stroke and gearbox oil mixed together :/
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supermotos all the way :p

[salem1987]

that sounds odd.. How long have you had the bike?

If not very long i'd drop the gearbox oil and change it for starters. Somone may have filled it with 2 stroke oil - it really does happen lol

[-]

If the oil level is normal then it sounds like the crank seals are gone. It's pressurising the gearbox and pushing gearbox oil out.

One of my TZR's did this the other week so is now queued for a strip down.

A good way of testing is to take the gearbox oil filler cap off, clamp the breather and put your hand or thumb over the filler hole whilst reving the engine. See if you can feel any pressure. If you can the pressure is coming from a leak from the crankcase.
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