Motorcycle Repair: 1980 honda XR80, combustion gases, piston rings

Question
Hi

I own a honda XR80 1980 and for some reason its
Blowing a lot of smoke. Its coming from a small rubber pipe
That you can see from underneath the bike.
Please answer my question because I have no clue as to why its doing this.

Cheers

Answer
Hi Jacob,

The rubber pipe is your engine breather and
usually smoke from that means your piston
rings are stuck or worn out or the cylinder
has some damage to it.

The smoke is from the combustion gases getting past
the piston and rings and entering the crankcase.

It might run for awhile but you will need
to rebuild the top end of the motor soon.
It might just need a piston and rings
or a rebore and oversized piston if badly
damaged.

Not much you can do about it as the smoke
has to get out of the crankcase or else pressure
will build up inside the motor and blow all the seals
and gaskets.

Pistons are not too costly for these smaller engines.

Good luck!

Wayne S
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