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Post by baldmeister on Sept 16, 2015 9:27:37 GMT
hi, anyone know whats involved with changing a vbb to 4 speed from 3 ?? i want to keep the 8 inch wheels so just sticking in a px lumps out of the question.
cheers all . dave
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Post by bryno on Sept 16, 2015 12:48:25 GMT
If it's a VBB its already a 4 speed, VBA was the 3 speed.
I did it on mine, you need the 4 cogs, xmas tree cluster, selector box and hand grip, from memory I also used the VBB's axel/cruciform assembly as well to keep it simple and be sure everything lined up.
Ratio wise IIRC the VBA's 3rd ratio is same as the VBB's 4th so you'll not gain in top end, but it makes it a bit more ridable as a smaller gap between the gears.
You are right to keep the proper motor and 8" :-)
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Post by baldmeister on Sept 17, 2015 9:59:44 GMT
hi bryno, thanks for advice , have you had any dealings with the 10 inch wheels that fit on the 8 inch hubs? would they make any difference?( only enquiring as i saw them on scootrs site!) also any idea of anyone in uk who stocks vbb gears?? cheers dj
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Post by henri on Sept 17, 2015 15:48:09 GMT
vbb gears ,try bill drake at vespa club uk , allstyles or beedspeed , allstyles do the 8"/10" gs rims aswell ,but on a vbb fork leg an link they will rub under suspension compression on mudguard . H
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Post by henri on Sept 17, 2015 15:49:35 GMT
just had a thought ,will check wether my 8" gears n tree are vbb or super , H
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Post by bryno on Sept 18, 2015 11:36:14 GMT
I bought a set of the GS 10" wheels and a longer stand to fit my VBA.. then promptly sold them again, the VBA looked so right on the 8".
As Henri says the front wheel will hit the guard under braking AND it will not sit right in the mudguard as the angle of the 8" forks is not the same as the 10"..
Even if you fit forks from a 10" wheeled classic it will still hit the mudguard. You can fit a stiffer spring, but that starts to change the way it will ride.
And if you fit 10" forks the 'new' hub will not be the same as the GS wheel you will need to use on the rear. And you cant fit the later 10" rear hub on a VBA engine so you end up with odd wheels.
Honestly I went round the houses on how to make the VBA more rideable and spoke to lots of other owners, in the end my advice is to accept it for what it is, stick to the 8's, and just do the box conversion. Mine was actually a nippy scooter with 4 speed, zipped along at about 50 and got there quick.
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Post by shipscat on Sept 19, 2015 8:25:05 GMT
if you want more power and speed it can get pricey i can recommend fitting a sip road 2 vintage look sports pipe it will make a noticeable difference
just be careful you don't catch the tuning bug
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