Ducati/Laverda: Sport1000-SF2 bastard child

chrisk

chrisk

Hero member
Location
Brisbane, Australia
:D Not really, but it got your attention didn't it?

OK, here's the deal. My Lavuki is about to undergo a heart transplant. The 270-880cc is taking it's rightful place in the SF frame for a while.

I just bought a set of Sport1000 wire wheels, the front is a 120, the rear is a 180 (replacing the 120/200 set-up that's there now), as to not have to go the offset sprocket route, I'm thinking of offestting the whole motor.

Looks like 10 - 15mm is the amount I need to shove it over. This normally would be pretty hard to do, but as I spread the frame to get the GSXR motor in, it should be pretty staight forward.

Does anyone have any thoughts as to how this will affect handling? (The offset motor, not the fat wheels)


 
Before you dismantle it can you post more pics of the Lavuki? Really interesting but I can't find the previously posted pics.
No idea on offset effect.
 
Grant said:
Before you dismantle it can you post more pics of the Lavuki? Really interesting but I can't find the previously posted pics.
No idea on offset effect.
Click to expand...

Go here Grant. Can't work out how to get them onto the forum. http://s1291.photobucket.com/user/laverdaledgend/library/#/user/laverdaledgend/library/?sort=3&page=1&_suid=141749864482805714316201899795
 
First thing would to be to see what the weight bias is anyway ? ie i doubt the centre line of the weight of the engine is down the centre line of the frame now anyway ? Chances are by moving it you could be bringing it into line rather than out.
 
Did i read that right ? 120/200 combo now ? So going to 120/180 you're moving the motor toward the centerline ?

I remember the pics and doubt if that's right, lol - yes, move it over, the end result will probably be quite acceptable IMO.
 
Paddy said:
First thing would to be to see what the weight bias is anyway ? ie i doubt the centre line of the weight of the engine is down the centre line of the frame now anyway ? Chances are by moving it you could be bringing it into line rather than out.
Click to expand...


100% correct Paddy. This simple experiment proves your point. The SF engine dresses to the left!

http://s1291.photobucket.com/user/laverdaledgend/media/SFWeightbias_zpsd4be844e.jpg.html#/user/laverdaledgend/media/SFWeightbias_zpsd4be844e.jpg.html?&_suid=141755380925007995594271864577
 
Here you are Chris, just put your short cuts inbetween the 'Insert Image' brackets


P1010161_zps76f9b480.jpg


SFWeightbias_zpsd4be844e.jpg
 
SFWeightbias_zpsd4be844e.jpg.html


Bah-humbug, did it exactly as per directions .........Pffft ... fucking technology, better off drawing a fucking picture in the fucking sand and hope some cunt comes alongs and likes it!  (puke)

 
You can't be Chris! This is the shortcut you are trying to put up:
http://s1291.photobucket.com/user/laverdaledgend/media/SFWeightbias_zpsd4be844e.jpg.html?#/


This is the correct one:
http://i1291.photobucket.com/albums/b552/laverdaledgend/SFWeightbias_zpsd4be844e.jpg


And put between the 'insert image' brackets:
SFWeightbias_zpsd4be844e.jpg
 
Chris if your keen maybe balance the engine off a thin block set on the centreline of the engine and a couple of weighing scales either side then do the same with the offset.Like the weigh your bike thread.A lot of trouble to prove something you cannot change.Chain run is important to get right,with the engine mounted in the frame its pretty monolith.Weight distribution not might not be perfect,but not a hell of a lot different.Grating to a perfectionist,but I don't see a fix,outrigger sprocket bearing,shit loads of work.
 
Why do you think I love taking my mongrel TL come SL Pantah to the NSW Ducati Club Concourse, rusty mufflers with big groves wear into them from the rear wheel Axel.Gets some funny looks.
 
Ooolie doolie, Chris ... and I thought i did some pretty wacky mods to my SF!! Love to hear how the Suzerda GSFX-R felt on the road and how it handled a doubling of Rr wheel HP. Actually I think I beat you to the punch - I put a GSX-R J(? two round headlights and inlet tracts) model fairing on my SF about 18 years ago ... set it up with the full fairing but only ran the top half ... it's supposed to be mated to an RGS tank (fibreglass dummy cover over a stainless tank) - but I needed to ride on it and

When I fitted 17 inch wire wheels (4.25 inch rear Akront) to mine I originally ran a 140 (too small) then a 150 (just right baby bear) and then was told a 160 would work on that rim size - no, too big; sidewalls ended up looking like one of those original Avon Roadrunners - impossible to lean it that far! And with the 160 the chainline was too narrow, so I went the offset sprocket (maybe 5mm from memory). Was thinking of 5 inch supermotard rim but too much hassle - I'm going back to the 150.

To go to 180 you'll need at least 15mm from std, to go 200, add another 10mm.

I toyed with the idea of shifting the donk right and I reckon the weight bias L-R would be better (a lot of weight on the left drive assembly (plus I've got a GPX1000 alternator fitted so lose about 3 kg!). I'm pretty sure cornering clearance is better on the right as std - only ever dragged the bolt on the lower selector cover once on the track (when running 18s), but not sure on that.

Let me know how you go. And BTW, spreading the frame under the tank to get longer inlet tracts for my Keihin FCR 39s is another idea I floated when I should have been sleeping!  I'm running out of years for all these mods!

I like the look of that swingarm - what's it off? I have a Yamaha Deltabox and monoshock off an FZR ... another deadend idea I think!!
QF
 
chrisk said:
Does anyone have any thoughts as to how this will affect handling? (The offset motor, not the fat wheels) 
Click to expand...
ay Chris. i recall the Spondon had the donk shoved just a bit to the right.  i guess for a similar reason?

was a good 15 mm, maybe 20?  Steve.B might be able to confirm?
initially, i thought it a bit odd, considering the ground clearance issue on the series-1, but it worked good.
i reckon the crank also sat just a bit higher (similar to offset) above the road, than the factory frame.  & that didn't matter, as everything else was a lot lighter and lower, including my arse,,  not that it weighed that much, 30 years ago.  ho-hum.
bareframe-cr.jpg

it sure was a lot of fun, on the road or track.
 
Must be more offset than that Mark, it's got a 160 on there now and just from memory I reckon there's still a good 30mm clearance to the chain.  I think they did it that way so as to equalise the problems with the underneath of the whacky swingarm support.  There's plenty of space between the left swingarm pivot and the primary case, but it's tight where the support for the pivot wraps underneath.
 
breganzane said:
...  I think they did it that way so as to equalise the problems with the underneath of the whacky swingarm support.  ..
Click to expand...
thanks Steve.  & that makes sense.
& i'm sure you noticed the grinding work that was inflicted on both the lower ends of that 'whacky' U-tube?

would like to 'av been responsible, but alas no,,  that was the work of Pete.W, at Lakeside circuit.
i could only manage to rub off the alternator dry cover.  too easy ay.  8)

<edit>  http://www.breganzane.com/rebuilds/spondon/finished.php
 
The scrawp marks on that u-tube are still there and visible under the new paint, roughly similar both sides.  Whether that's because it's somewhat symmetrical (and the rest ofthe layout stemmed from that) or just because Pete rode it till it scaped the frame and backed it off 1/16 of turn I'm not sure.  In the context of this thread, it seems to have handled OK and I'd guess from memory that the lump is offset at least 30mm to the right compared to a stock frame.
 
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