As suggested in another post please see the photo of the 25SA I've been seeking gear ratio information upon recently. It is a '58 model and came to me with a 250 single engine fitted and sported a roadster two and a half gallon tank. The engine was returned to the previous owner while the tank went to another GRA member who was keen to use it on another more suitable project. Other than removing those parts and fitting engines plates that suit the twin, the bike is viewed as purchased and as it is today.
Apart from the rear seat frame/mudguard loop, which is home made, the frame appears to be mostly original and all there. Unfortunately some brackets have been welded on to the bottom loop of the forks, so will require some careful removal. The rear wheel has an 18 x 400 rim and trials tyre attached and will be replaced with an original sized 19 x 3.75. I have a replacement rear seat frame, made to the factory drawing. Once the engine is finished and fitted in place then there will be the tricky task of fabricating the exhaust systems.
I'm still seeking a petrol tank, so if anyone has a suitable item surplus to requirements that they are willing to part with then I'd be pleased to hear from you!
With regard to the engine, modification of existing parts is being conducted, such as making the flywheels full circle and packing the crankcases to improve primary compression. Although options for the latter appear rather limited and certainly won't approach that achievable in the single. Providing the balance hasn't been too upset by making the flywheels full circle then I'm hoping to be able to dispense with the mag flywheel and use battery/coil/points igniton. Haven't yet decided what to do about carburation! With thanks to every one who has shown an interest in the project, I've appreciated all your reply's.
Apart from the rear seat frame/mudguard loop, which is home made, the frame appears to be mostly original and all there. Unfortunately some brackets have been welded on to the bottom loop of the forks, so will require some careful removal. The rear wheel has an 18 x 400 rim and trials tyre attached and will be replaced with an original sized 19 x 3.75. I have a replacement rear seat frame, made to the factory drawing. Once the engine is finished and fitted in place then there will be the tricky task of fabricating the exhaust systems.
I'm still seeking a petrol tank, so if anyone has a suitable item surplus to requirements that they are willing to part with then I'd be pleased to hear from you!
With regard to the engine, modification of existing parts is being conducted, such as making the flywheels full circle and packing the crankcases to improve primary compression. Although options for the latter appear rather limited and certainly won't approach that achievable in the single. Providing the balance hasn't been too upset by making the flywheels full circle then I'm hoping to be able to dispense with the mag flywheel and use battery/coil/points igniton. Haven't yet decided what to do about carburation! With thanks to every one who has shown an interest in the project, I've appreciated all your reply's.
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