Bit of help ideas needed here please. I have been working on a gold star B31 scrambler for a while and finally starting to see light at the end of the tunnel, that was until fitting the back wheel and found that the chain alignment is 3/8 of an inch on an angle out. After checking everything I have had to do with have discovered that at some point in this bikes life has had I assume a big hit sideways on the back wheel which has tweaked the frame swinging arm pivot points. The bike is all but done and the frame nicely sprayed in a lovely Laverda Jota silver. Any ideas as to how I can bend the pivot points back without using a flame. The engine and gearbox is in and I really dont want to remove it all. I have years of engineering experience and a degree in using acceptable force on stuff when needed. I have a portable hydraulic ram and a lathe to turn up spacers and loads of off cuts to make bits. I just dont want to make it worse and kick myself for not asking if anyone else has had the same issue, Cheers Staffs
Find someone with a Motoliner jig. They'd probably sort it in half an hour.
I would take it to an expert. I say this because the frame tubing is quite thin. If its a genuine scrambler GS it should be Reynold 531 so it will put up a fight. I've done some DIY frame repairs and its very hard to hold the frame in such a way that only the part you want to bend bends. That's where the jig comes in.
I know how you feel, I recently pressed out he bushes from a swing arm, had it powder coated, pressed new bushes in then found someone had opened up the spindle hole and it was unusable. Had get another swing arm and do the whole lot again.
Speak to jake robbins
Hi,
You have probably already checked but is the swinging arm OK? It is more likely to be damaged.
Dave.
Thank you, will see if there is Motoliner jig person where its piratical to take the bike. I did suspect the swinging arm first instance but its fine. You can see the slight kink on the frame brackets so I am sure this is the issue. I have calmed down a bit now and will go back into the workshop to decide the next step. Ill let you know what the outcome is good or bad ;D
Without sounding rude who is Jake Robbins please
Quote from: staffs on 14 Feb, 2026, 11:23 Without sounding rude who is Jake Robbins please
Try this link https://jakerobbinsvintageengineering.co.uk/motorcycle-frame-straightening
Thanks for the link, I've just bookmarked it!
Thank you for all your help and advice. The complete bike although being a hybrid Gold Star 350 with the right bits and a mix of stuff is not worth a huge amount of money should I decide to sell it one day, So today with care gave the offending pivot points a sharp controlled wrap with a hide mallet. Its nearly done the trick and I think will be ok for the few run outs I will do with this bike. Its great to be able to ask other motorcycle enthusiasts advice even if you decide to do it your way in the end. Lets be honest here, the wife is not really that interested in garage talk so get little feed back on your ideas. :D Thanks All