3 replies to this topic

[BeTon]

Hello all,

I am Ton from the Netherlands and recently bought a Fantic 241 Trial is quite a sorry state... The piston has a piece missing from the top edge and the piston ring has a piece missing. The barrel itself seems to be oke. My plan is to make the bike technically sound first before restoring it completely.

I have been looking for a piston for some time now and I can find 3 piston brands that can supply a 69mm piston;

- Asso Werke (original piston)
- Vertex
- Pattern

The Asso piston is becoming rare and fairly expensive! Are the other 2 brands any good, or should I stick with the original piston?

The bike:


The piston:

[BeTon]

One other question I have is the following:

The downtube of the frame seems to have a big dent in it. Is this "original" (to accomodate the carb...) or is my frame damaged?

[Lee Harris]

The Dent is std, no worries


Asso is tghe best but most expensive, Gul is the cheapest and you will feel it

I have no experience with the Vertex...

Lee

[BeTon]

Many thanks to Lee Harris and his Dutch friend!

My package with the barrel and piston arrived this week in good condition. Now all I have to wait for is for my gasket set to arrive from the UK.

I want to assemble the engine and try to get it going before spending too much money on this bike. As I don't have a workshop manual for this bike and cannot find it anywhere, are there specific issues I need to take care of assembling the engine, like:

Is there a certain order for torqueing down the head nuts?
What is the torque anyway?
Is there a specific method or tool to install the piston on the conrod?
Do I need to use liquid gasket somewhere?
What kind of oil should I use and how much?
What is the right spark plug?
Any other bits I should replace while I am at it?

Sorry for all the questions... hope someone can help me before I mess something up.

Any other tips and tricks are more than welcome!