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Rebuild a 250 Alpina 1974 type 115

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  • Author

Swimming bike ... Ida went here few days ago. 

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  • 2 weeks later...
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  • Finally, from (without registration):  To : New  seat New OKO carburator New tires Tank restored  with new petcock New chain and sprockets Bottom engin rebuilt

  • I use a socket with the OD machined down to fit onto that nut. Yes a clutch holding tool is required the way you are doing the work, but if you are going to pull a Bultaco motor apart again, cons

  • Engine is out 🙂, I wish to open it asap but the frame is the priority...  

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  • Author

We are back, I  have done the rear fender, tail light and did few things I had to redo by missing spares ...

The space is tight on the chain side for brake, chain cover, chain, Shock Absorbers ...

Next job: set up the alignment seat/ tank/ frame. 

 

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  • Author

Ready for the adjustments: nothing must move with the nuts ( 3: one in front and two in the back.

 Next step will be to review the gas tank : liner, painting,...

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  • 2 weeks later...
  • Author

I just get the sealing kit for my gas tank:

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My tank had a long life before:

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  • Author

I am thinking for the final color like this Triumph 🤫...

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  • 2 weeks later...
  • Author

I just get the service manual from Ebay ...😉

 

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  • 3 weeks later...
  • Author

News: I bought a OKO carburetor (they are affordable). 

I a still working in my gas tank, inside liner will be done this week (ready for the last phase).

I have the paint for outside, the tank is 90% ready.

I have  a question: do you have a reserve position in fuel valve  ?

Fly wheel is removed, no real corrosion. Electronic ignition is schedule with 12 DC for the light and accessories. 

 

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8 hours ago, Divouneh said:

News: I bought a OKO carburetor (they are affordable). 

I a still working in my gas tank, inside liner will be done this week (ready for the last phase).

I have the paint for outside, the tank is 90% ready.

I have  a question: do you have a reserve position in fuel valve  ?

Fly wheel is removed, no real corrosion. Electronic ignition is schedule with 12 DC for the light and accessories. 

 

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Some fuel taps have a reserve position. Some don't. I couldn't see your fuel tap to know. If you've got the original fuel tap it would be a good idea to use a new (modern) tap instead to get a more reliable flow stream.

When you do the liner, take care to avoid letting liner harden in the threaded hole for the tap. On a couple of the Spanish fibreglass tanks I've lined, the thread required cleaning out of liner and for that I used a thread cutting tap when the liner was solid but not fully set.

whole project looking good!!! did i missed what kind of rear shocks are you using?

I have a 116 just started to get going after more than 25 years in storage...

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  • Author

Gas cap: I will need a new clean gas cap, they seems so expensive 😪.

Do you have a store to go ? 

Thanks

11 hours ago, Divouneh said:

Gas cap: I will need a new clean gas cap, they seems so expensive 😪.

Do you have a store to go ? 

Thanks

What's wrong with yours? There's not much to them.

Anyway if you want a new one, In Motion has push-in type Bultaco caps list price 24 british pounds.

If you can bear having the wrong logo on it, the Montesa Cota 348 push-in cap will fit your tank.

A friend uses a rubber foot from a tubular framed bar stool as a cap for his tank.

  • Author

A nice repainted gas tank with such cap 😏...

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