Top end rebuild noob q's

[TavisB]

I've never done a top end, but I think I should do one on my 03 EC250 just due to it hitting ~100 hours. As far as I know there are no problems, it's just getting up there.

I found a source for a Vertex 23249B piston. I haven't found a good source for a top end gasket set yet though.

Here are my questions:

1. Can anyone help me out with a link for a top end gasket kit?

2. Do I need any specialty tools? Any other parts besides the above?

3. If there is no damage to the cylinder, do I need to do anything there?

4. Is there a chance I will need a different piston from what I ordered (again assuming there is no damage to the cylinder)?

 

[Jakobi]

I've never done a top end, but I think I should do one on my 03 EC250 just due to it hitting ~100 hours. As far as I know there are no problems, it's just getting up there.

I found a source for a Vertex 23249B piston. I haven't found a good source for a top end gasket set yet though.

Here are my questions:

1. Can anyone help me out with a link for a top end gasket kit? Any GasGas dealer can source a gasket. You'll need to take note of the size of the stack that is in the bike.

2. Do I need any specialty tools? Any other parts besides the above? You might need a ring end spanner with a thin wall/one thats ground down to access the front cylinder bolts. Small pliers/c-clipper for installing the new piston clips.

3. If there is no damage to the cylinder, do I need to do anything there? A good clean with an abrasive pad to remove any glazing from the cylinder walls.
4. Is there a chance I will need a different piston from what I ordered (again assuming there is no damage to the cylinder)? With no damage and only 100hrs you should have no issues putting the stock sized piston back into the engine. IE A piston in an A cylinder.

As above..

 

[TavisB]

Thanks! Thats what I needed to know.

So did I order the right piston? The Vertex site listed the B size as the only piston for my bike. Its 66.34 mm.

http://www.na.vertexpistons.com/ProductInfo.aspx?item_id=5460

 

[noobi]

Thanks! Thats what I needed to know.

So did I order the right piston? The Vertex site listed the B size as the only piston for my bike. Its 66.34 mm.

http://www.na.vertexpistons.com/ProductInfo.aspx?item_id=5460

The difference in the sizes, A, B, C etc, are so small that it makes no difference in reality. The B size piston you have will be fine.

 

[hannesd]

The difference in the sizes, A, B, C etc, are so small that it makes no difference in reality. The B size piston you have will be fine.

i'd get my cilinder measured, i know i will ,and if i can't then i'll just go with the same size piston again (A)
(busy doing my top end as we speak on the gasser 200)?

ciao, Hannes.