Rush of blood to the head....

[James W]

Just a small point, but I would remove the piston from the con rod before I were to file or sand out the dink.

Good call. That was the plan, and I think i'll probably replace the rings as well.

 

[VicS]

Good call. That was the plan, and I think i'll probably replace the rings as well.

Long time since I replaced piston rings in anything. Seem to remember you either have to remove the wear ridge at the top of the cylinder ( if there is one??) or fit a stepped top ring.

 

[chrishelen]

Good call. That was the plan, and I think i'll probably replace the rings as well.

I used to wrap small pistons in a cloth soaked in boiling water for a minute or two,makes it easier to remove a stubborn gudgeon pin.

 

[rotrax]

When racing two stroke motorbikes broke their pistons, all sorts of foreign material got into the crankcases.

We would heavily smear a thick layer of grease on the flywheels-or bobweights if it was a Villiers-and rotate the engine.

The grease would pick up bits of piston ring, piston and sometimes bits of the cylinder or liner.

In the workshop, if one of my mechanics dropped a gudgeon pin clip or some of the loose crowded small end roller bearings from a Jawa or CZ into the crankcase the old grease on the flywheels would usually fetch them out.

Will only work within fairly tight clearances-I am not familliar with your engine so you must take a look and decide if it is worth a try.

Good Luck.

 

[TQA]

When racing two stroke motorbikes broke their pistons, all sorts of foreign material got into the crankcases.

We would heavily smear a thick layer of grease on the flywheels-or bobweights if it was a Villiers-and rotate the engine.

The grease would pick up bits of piston ring, piston and sometimes bits of the cylinder or liner.

In the workshop, if one of my mechanics dropped a gudgeon pin clip or some of the loose crowded small end roller bearings from a Jawa or CZ into the crankcase the old grease on the flywheels would usually fetch them out.

Will only work within fairly tight clearances-I am not familliar with your engine so you must take a look and decide if it is worth a try.

Good Luck.

It is a 4 stroke. The greased flywheel trick will not work.

Used to race Villiers and Bultacos, greased flywheels at the track were commonplace.