Author Topic: Julian's Scrambler build "Post 1"  (Read 28429 times)

Offline JulianM

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Re: Julian's Scrambler build "Post 1"
« Reply #15 on: 03.10. 2012 14:28 »
Next job i'm in the middle of now is converting to a Yamaha FZR Clutch, including Cush Drive
Why an FZR?   Because I happened to just have a dismantled engine in my shed. 
BUT it is a really nice little light clutch and capable of about 130 break +  so will not struggle with my micky mouse figures,

Pics to follow.

J
52 Ducati Cucciolo Race bike 50cc
64 Triumph TR6 SS
67 Triumph 100C
67 ILO Race Bike  50cc
71 Sachs Race Bike  50cc
71 Laverda 750SF,
71 Laverda/Egli 750SF, Race bike,
71 Norton Commando 750 Roadster,
71 Norton Commando 750 SS
75 Laverda 3C,
75 Moto Guzzi Le Mans Mk0,
76 Beta Cross TR6  50cc
80 Ducati 900 MHR,
81 Yamaha RD350LC

Offline JulianM

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Re: Julian's Scrambler build "Post 1"
« Reply #16 on: 08.10. 2012 08:20 »
Barrels as from 4pm Friday,







Julian
52 Ducati Cucciolo Race bike 50cc
64 Triumph TR6 SS
67 Triumph 100C
67 ILO Race Bike  50cc
71 Sachs Race Bike  50cc
71 Laverda 750SF,
71 Laverda/Egli 750SF, Race bike,
71 Norton Commando 750 Roadster,
71 Norton Commando 750 SS
75 Laverda 3C,
75 Moto Guzzi Le Mans Mk0,
76 Beta Cross TR6  50cc
80 Ducati 900 MHR,
81 Yamaha RD350LC

Offline a10 gf

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Re: Julian's Scrambler build "Post 1"
« Reply #17 on: 08.10. 2012 11:17 »
Quote
Barrels
! Respect & admiration.


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Online bsa-bill

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Re: Julian's Scrambler build "Post 1"
« Reply #18 on: 08.10. 2012 12:42 »
Just gets better and better
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline JulianM

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Re: Julian's Scrambler build "Post 1"
« Reply #19 on: 08.10. 2012 16:02 »
Thanks guys,

Hopefully it works too  ;o)

J
52 Ducati Cucciolo Race bike 50cc
64 Triumph TR6 SS
67 Triumph 100C
67 ILO Race Bike  50cc
71 Sachs Race Bike  50cc
71 Laverda 750SF,
71 Laverda/Egli 750SF, Race bike,
71 Norton Commando 750 Roadster,
71 Norton Commando 750 SS
75 Laverda 3C,
75 Moto Guzzi Le Mans Mk0,
76 Beta Cross TR6  50cc
80 Ducati 900 MHR,
81 Yamaha RD350LC

Offline JulianM

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Re: Julian's Scrambler build "Post 1"
« Reply #20 on: 17.10. 2012 08:56 »
Clutch conversion.

Thinking about the power etc and what to do I had a few concerns. My idea is to get it to 800cc with a CR of 10.5:1 and make a real torque monster. Hopefully achieving 60hp in the process.  So a standard or even uprated A10 clutch will not do!
A Suzuki GS or GT500 is an easy swap but both of these are about 50hp in stock form and I know from past playing that the GT550 clutch is not capable of much more than 60hp and with nowhere near the torque of an 800cc 4 stroke!!  So I cancelled these out.
I considered a Commando conversion but then realized I had a stripped Yamaha FZR750 engine in my stores. And the clutch on this is the same as that on the FZ1000, both of which out power my meager 60hp by about double!  It's also a nice 8 plate job weighing a lot less than my standard A10 clutch unit. Plus it has a cush drive, so the plan was to make it fit!

I am not going through the process here as it is not an easy conversion and not a recommendation unless you really need a super clutch.
Just here to show what I'm doing and why.

The two compared for size


8 nice fat plates!


Clutch basket offered up for fitting


Gear wheel cut for cush drive springs and pegs, and the centre fitted with the bearing carrier.




Assembled and splined drive/carrier shaft almost ready




More to follow.
Julian
52 Ducati Cucciolo Race bike 50cc
64 Triumph TR6 SS
67 Triumph 100C
67 ILO Race Bike  50cc
71 Sachs Race Bike  50cc
71 Laverda 750SF,
71 Laverda/Egli 750SF, Race bike,
71 Norton Commando 750 Roadster,
71 Norton Commando 750 SS
75 Laverda 3C,
75 Moto Guzzi Le Mans Mk0,
76 Beta Cross TR6  50cc
80 Ducati 900 MHR,
81 Yamaha RD350LC

Offline muskrat

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Re: Julian's Scrambler build "Post 1"
« Reply #21 on: 17.10. 2012 09:32 »
Gee mate looks like one of those "now I'll have to do this to match that" type of builds. Wish I could play with stuff like that.
One of my favorite sayings " lots is good, more is better but TOO much is just enough".
Cheers
'51 A7 plunger, '57 A7SS racer now a A10CR, '78 XT500, '83 CB1100F, 88 HD FXST, 2000 CBR929RR ex Honda Australia Superbike .
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Offline JulianM

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Re: Julian's Scrambler build "Post 1"
« Reply #22 on: 17.10. 2012 13:47 »
 *smile*  Yep,   it does seem like chasing the weak link!  but trying to do it before I need to instead of after  ;)

One of my guys just came in with the wheels after painting the hubs and re-spoking so lots for me to do.
Added to the fact that I just went to collect my new crank so it's all coming together!

Julian  *smile*
52 Ducati Cucciolo Race bike 50cc
64 Triumph TR6 SS
67 Triumph 100C
67 ILO Race Bike  50cc
71 Sachs Race Bike  50cc
71 Laverda 750SF,
71 Laverda/Egli 750SF, Race bike,
71 Norton Commando 750 Roadster,
71 Norton Commando 750 SS
75 Laverda 3C,
75 Moto Guzzi Le Mans Mk0,
76 Beta Cross TR6  50cc
80 Ducati 900 MHR,
81 Yamaha RD350LC

Offline JulianM

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Re: Julian's Scrambler build "Post 1"
« Reply #23 on: 20.10. 2012 16:32 »
Little pic of the new crank against the old one.  
88mm Stroke and 3KG Lighter.  65% Balance Factor.
And the crank counter weight mass is in a much smaller diameter so the weight saving will be multiplied grately!



Wheels all built up and hubs now painted in frame colour, Tyres and tubes fitted, So fitted the rear for a try out.








Julian

Block also finished, pics to follow shortly.
52 Ducati Cucciolo Race bike 50cc
64 Triumph TR6 SS
67 Triumph 100C
67 ILO Race Bike  50cc
71 Sachs Race Bike  50cc
71 Laverda 750SF,
71 Laverda/Egli 750SF, Race bike,
71 Norton Commando 750 Roadster,
71 Norton Commando 750 SS
75 Laverda 3C,
75 Moto Guzzi Le Mans Mk0,
76 Beta Cross TR6  50cc
80 Ducati 900 MHR,
81 Yamaha RD350LC

Offline a10 gf

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Re: Julian's Scrambler build "Post 1"
« Reply #24 on: 20.10. 2012 19:12 »
Again, impressive work! What's the plan with the timing side ?


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Offline Hubie

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Re: Julian's Scrambler build "Post 1"
« Reply #25 on: 20.10. 2012 22:48 »
Looks like it's going to be awesome!  I wish I had your skill  *smile*
1959 BSA Golden Flash
1956 Royal Enfield Super Meteor
1955 Royal Enfield 350 Bullet
2007 Harley Davidson Sportster 1200 Custom

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Offline JulianM

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Re: Julian's Scrambler build "Post 1"
« Reply #26 on: 22.10. 2012 07:42 »
What's the plan with the timing side ?

Hi,
Nothing trick, just a slight mod on the roller conversion. Nothing to speak of other than a little top hat bush.

"Quote"
Hubie,
Looks like it's going to be awesome!  I wish I had your irritating habit to change everything you touch  *smile*  "Quote"

Fixed it for you  ;)
52 Ducati Cucciolo Race bike 50cc
64 Triumph TR6 SS
67 Triumph 100C
67 ILO Race Bike  50cc
71 Sachs Race Bike  50cc
71 Laverda 750SF,
71 Laverda/Egli 750SF, Race bike,
71 Norton Commando 750 Roadster,
71 Norton Commando 750 SS
75 Laverda 3C,
75 Moto Guzzi Le Mans Mk0,
76 Beta Cross TR6  50cc
80 Ducati 900 MHR,
81 Yamaha RD350LC

Offline The pirate

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Re: Julian's Scrambler build "Post 1"
« Reply #27 on: 22.10. 2012 08:08 »
Hi, the rebuild is awesome. I have a question? wont there come a time when the power will blow the cases and barrel to bits - as these bikes were never designed for this, as a standard bottom end and barrels prove time and time again.

It is still brilliant engineering whatever your motive.
The Pirate

Offline JulianM

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Re: Julian's Scrambler build "Post 1"
« Reply #28 on: 22.10. 2012 09:10 »
Hi there,

Yep, there surely will come a time, but I "think" for now I have covered every post,  New designed Crank and rods, new pistons, new designed stronger barrels, "Wills Ring" head sealing so no gasket problems. Strengthened block and head studs.  I don't think the crank case will suffer too much and due to the heavy duty barrel hopefully this should add strength to the crank cases instead of the other way round.
I am aiming for 60hp which in my thinking is not a great deal, though "we shall see"    Am fairly confident all will stay together. It's not an endurance racer either, so I'm unlikely to hold it at full power for long.
For my day job I do this kind of thing all the time and some engines make a BSA look strong so get used to looking for weak spots. I think it will hold together for anything I will throw at it. 

Regards,
Crossed fingers Julian.
52 Ducati Cucciolo Race bike 50cc
64 Triumph TR6 SS
67 Triumph 100C
67 ILO Race Bike  50cc
71 Sachs Race Bike  50cc
71 Laverda 750SF,
71 Laverda/Egli 750SF, Race bike,
71 Norton Commando 750 Roadster,
71 Norton Commando 750 SS
75 Laverda 3C,
75 Moto Guzzi Le Mans Mk0,
76 Beta Cross TR6  50cc
80 Ducati 900 MHR,
81 Yamaha RD350LC

Offline The pirate

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Re: Julian's Scrambler build "Post 1"
« Reply #29 on: 22.10. 2012 12:05 »
I remember years ago, throwing on - clipons, very high comp pistons, bigger carby and changed the oil and went road racing, illegal road racing- the barrel parted company from the rest of the engine and a conrod tried to walk along the road - funny if it was not so expensive.
The Pirate