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  #1  
Old 01/01/2012, 03:10 PM
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ADickerson ADickerson is offline
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Default 25SA Renovation

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.
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  #2  
Old 01/01/2012, 04:30 PM
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riflegreen riflegreen is offline
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The rolling chassis looks pretty good .

Chris
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  #3  
Old 01/01/2012, 05:58 PM
Brian Catt Brian Catt is online now
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Looking forward to seeing this soon!
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  #4  
Old 01/01/2012, 06:17 PM
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dave higgins dave higgins is offline
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Yeah, it looks like good clean bike to start from, apart from the link arm mod, by mr blobit the welder..
That rear frame section & s/arm look very familiar, is this the same as the back end of my own bike, where the top shock mounts are not offset, a better design, than the later type, in my own humble opinion.
But it has all the makings of a cracking project & it will be pleasure to see another variation of a greeves on the track soon (ish).
i don`t envy you having to design an exhaust though, are you going to go for a underslung or high level system, or are you trying not to think about it for the minuite.....
But good to see its all under way & hope you keep us posted on the progress, you & rob make. dave.
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Old 01/01/2012, 08:32 PM
Punchy Punchy is offline
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Quote:
i don`t envy you having to design an exhaust though, are you going to go for a underslung or high level system, or are you trying not to think about it for the minuite.....
But good to see its all under way & hope you keep us posted on the progress, you & rob make. dave.
Yes Dave we're defo trying not to think about it! Visions of 2 high level exhausts expanding to a diameter of around 6 inches each side of the bike has left us with sleepless nights , mind you if we could get get off the line quick no bugger would be able to pass I think a couple of maico up and overs would be just the ticket
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Old 01/01/2012, 08:47 PM
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dave higgins dave higgins is offline
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Maico up & overs maybe, but thats not really entering into the pre 60 spirit is it?
Have you thought about increasing your horse riding lessons?.. dave.
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  #7  
Old 02/01/2012, 05:02 PM
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ADickerson ADickerson is offline
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Talking

Quote:
Originally Posted by dave higgins View Post
Maico up & overs maybe, but thats not really entering into the pre 60 spirit is it?
Have you thought about increasing your horse riding lessons?.. dave.
Nice one Dave, with an up and over system riding lessons(of any sort) might be beneficial, mind you it should keep the nether regions nicely warmed.
Having seen some of the current modern systems fitted to Pre65 two stroke machines that look totally out of place, we'll be attempting something along more classic lines. The factory machines appear to have had stub exhausts fitted, which must have been deafening to anybody within a half mile of them. Thankfully we cannot use them in todays events so I hope a compromise system will eventually evolve, be it over or under.
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  #8  
Old 03/02/2012, 08:06 PM
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ADickerson ADickerson is offline
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[QUOTE=dave higgins;9441]Yeah, it looks like good clean bike to start from, apart from the link arm mod, by mr blobit the welder..
QUOTE]

Sadly, Mr Blobit the "welder" has left an indelible mark upon the bottom loop, which must now be replaced with a new tubular section. Initially I thought it had been brazed, but when it came to removing the offending item, John Fryatt tells me that brass had only been flowed on top of Mr Bolbit's handiwork. It's either replacing the tubular section, or finding another loop!
Onwards and upwards is the saying, or is it one step forward and two back. Never mind, on the plus side we've discovered one 3T Barrel from a fellow enthsiast, so all we need now is a mating half and we shall definitely be taking one step forward.
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Old 06/02/2012, 09:16 AM
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Adrian - I hear I might be the transport medium for said 3T barrell! Didn't realise you knew my old pal Porky! Going round to see him on Wednesday and no doubt get conned into something Greeves-related!

Rob
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  #10  
Old 06/02/2012, 12:00 PM
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johnrunnacles johnrunnacles is offline
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Default Bottom loop

Sorry Adrian, I had got behind with my Forum reading, not realising you were on look-out, too, for a bottom loop.
I still have the one I had mentioned to "our" Rob, before he said he was after a complete set of forks.
The loop can be your's, if you can settle with Rob? I was gifting it to him in exchange for parts I have taken from his 9E unit.
John
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