#5 lives... almost

sfcpiet

Administrator
Staff member
Location
Germany
A friend recently narrowly missed out on aquiring one of the five original Harris-framed Laverdas that Moto Witt had commissioned in the mid-1980s, Forum member Otto was the lucky buyer. I casually remarked that I knew where there was another... my friend requested I contact the owner to see if he was willing to sell. The ball started rolling...

I called Günther and asked the fatefull question. His answer was a flat "no". ;) But he instead asked if I'd be interested in helping him revive the bike. So, over the past couple of months, Günther and I have assessed the bike, decided the chassis required a full restoration, disassembled the bike and embarked on a pretty thorough going over. Goal is to take part in the August event at the Nürburgring where we aim to re-unite all five of the Moto Witt-commissioned frames.

The initiated will know that one frame was built as the SFC600, displayed at the Cologne IFMA in 198? and is now part of a collection in southern Germany. Two frames recieved Brettoni-tuned 580cc engines and took part in the german BoT championship, campaigned by Günther and Georg, generously sponsored by Moto Witt. The remaining frames went to Laverda dealers Schenk of Idstein, Germany and v.Dijk of Driebergen, Netherlands. The Schenk bike was built into a race/track tool but was never raced afaIk, ended up in Andy Wagners impressive collection and is now in Ottos' possesion. The v.Dijk frame formed the basis of a road bike, was duely registered in the Netherlands where it has remained and is now also in Ottos' possesion. Georg lost interest after a season and swapped his bike for a '74 SFC with Tim Parker in the US. Tim apparently rode the bike intensively and blew the crankcase at Daytona. This bike has found its way back to Europe and also currently resides in the Netherlands. Günther alone hung on to his bike, keeping it in his garage covered with blankets for over 35years!

Enough of the history...

I drove over to Günther for a first assessment. We first removed the plugs and cautiuosly turned the crank. To both our surprise, it turned with no undue resistance at all! Things immediately brightened up! Günther decided the patina was a bit excessive and disassembled the bike, brought carbs, brake components and forks over for rebuilding which all went well without further hassle. The rear WP suspension unit seemed to be in working condition but Günther decided it could do with some TLC. He found a specialist willing to overhaul it, should be back next week. The frame and swingarm were powder coated, new bearings fore and aft installed. The engine had been supplied by Augusto Brettoni and has no starting or charging system fitted. Günther wanted a simple, fool-proof ignition system in place of the OE Bosch running constant loss with a battery in the tail. I recommended a PVL magneto unit which was duly ordered and after a bit of head-scratching, actual thinking, machining and general wizardry, found its place on the RH end of the shortened Brettoni crank. Bodywork, tank and wheels got a fresh coating of orange, all wheel bearings were renewed. Fresh Battlax CR11s are now entrusted to protect the rims from damage. Valve clearances were checked and found to be spot-on, timing chain and tensioner both in excellent condition. Rusty fasteners were swapped out, the clutch cover removed to check for internal corrosion, of which none was found. New EBC floating discs were sourced to replace the stock 280mm front rotors, these will be relegated to the spare "rain" wheel set.

Yesterday was to be the big day. We installed the engine, forks and swingarm, fiddled with spacers and axles to get the wheels correctly spaced to finish the day with a rolling chassis. To say we were pleased with ourselves would be an understatement, well and truely chuffed actually!

Back in the day...
G Kernebeck Harris Laverda P2.jpg

Strip-down
IMG_7871.jpg

Raw frame
IMG_8326.jpg

Checking cut-off crank
DSCN1719.JPG

Porting a la Brettoni
DSCN1794.JPG

PVL Magneto
DSCN1724.JPG

Found the old cover could be made to fit
DSCN1740.JPG

Made a cover to close the hole
DSCN1754.JPG

Time-consuming
DSCN1626.JPG


Progress so far
DSCN1840.JPG

To be continued.

piet
 
A friend recently narrowly missed out on aquiring one of the five original Harris-framed Laverdas that Moto Witt had commissioned in the mid-1980s, Forum member Otto was the lucky buyer. I casually remarked that I knew where there was another... my friend requested I contact the owner to see if he was willing to sell. The ball started rolling...

I called Günther and asked the fatefull question. His answer was a flat "no". ;) But he instead asked if I'd be interested in helping him revive the bike. So, over the past couple of months, Günther and I have assessed the bike, decided the chassis required a full restoration, disassembled the bike and embarked on a pretty thorough going over. Goal is to take part in the August event at the Nürburgring where we aim to re-unite all five of the Moto Witt-commissioned frames.

The initiated will know that one frame was built as the SFC600, displayed at the Cologne IFMA in 198? and is now part of a collection in southern Germany. Two frames recieved Brettoni-tuned 580cc engines and took part in the german BoT championship, campaigned by Günther and Georg, generously sponsored by Moto Witt. The remaining frames went to Laverda dealers Schenk of Idstein, Germany and v.Dijk of Driebergen, Netherlands. The Schenk bike was built into a race/track tool but was never raced afaIk, ended up in Andy Wagners impressive collection and is now in Ottos' possesion. The v.Dijk frame formed the basis of a road bike, was duely registered in the Netherlands where it has remained and is now also in Ottos' possesion. Georg lost interest after a season and swapped his bike for a '74 SFC with Tim Parker in the US. Tim apparently rode the bike intensively and blew the crankcase at Daytona. This bike has found its way back to Europe and also currently resides in the Netherlands. Günther alone hung on to his bike, keeping it in his garage covered with blankets for over 35years!

Enough of the history...

I drove over to Günther for a first assessment. We first removed the plugs and cautiuosly turned the crank. To both our surprise, it turned with no undue resistance at all! Things immediately brightened up! Günther decided the patina was a bit excessive and disassembled the bike, brought carbs, brake components and forks over for rebuilding which all went well without further hassle. The rear WP suspension unit seemed to be in working condition but Günther decided it could do with some TLC. He found a specialist willing to overhaul it, should be back next week. The frame and swingarm were powder coated, new bearings fore and aft installed. The engine had been supplied by Augusto Brettoni and has no starting or charging system fitted. Günther wanted a simple, fool-proof ignition system in place of the OE Bosch running constant loss with a battery in the tail. I recommended a PVL magneto unit which was duly ordered and after a bit of head-scratching, actual thinking, machining and general wizardry, found its place on the RH end of the shortened Brettoni crank. Bodywork, tank and wheels got a fresh coating of orange, all wheel bearings were renewed. Fresh Battlax CR11s are now entrusted to protect the rims from damage. Valve clearances were checked and found to be spot-on, timing chain and tensioner both in excellent condition. Rusty fasteners were swapped out, the clutch cover removed to check for internal corrosion, of which none was found. New EBC floating discs were sourced to replace the stock 280mm front rotors, these will be relegated to the spare "rain" wheel set.

Yesterday was to be the big day. We installed the engine, forks and swingarm, fiddled with spacers and axles to get the wheels correctly spaced to finish the day with a rolling chassis. To say we were pleased with ourselves would be an understatement, well and truely chuffed actually!

Back in the day...
View attachment 104072

Strip-down
View attachment 104074

Raw frame
View attachment 104076

Checking cut-off crank
View attachment 104073

Porting a la Brettoni
View attachment 104082

PVL Magneto
View attachment 104075

Found the old cover could be made to fit
View attachment 104078

Made a cover to close the hole
View attachment 104079

Time-consuming
View attachment 104081


Progress so far
View attachment 104080

To be continued.

piet
see you in August😉
 
Thanks Piet. Interesting story. Those Harris frames never made a lot of sense to me. I didn't like the look of them. They appeared (to my mind at least) have frame tube joints and bends in the wrong place to carry the loads effectively. But seeing it stripped down so the whole frame structure is visible, The design makes much more sense. Those two tubes that go from the monoshock mount diagonally up to meet the frame backbone near the front of the seat make all the difference. They're partially hidden from view on the assembled bike so I hadn't spotted them before.
 
Harris Magnum II that was recently rebuilt here in Sydney, one of the interesting problems was the final drive chain tension through the arc of the swingarm travel, solved with a roller.
 

Attachments

  • IMG_20260416_122847.jpg
    IMG_20260416_122847.jpg
    155.9 KB · Views: 17
Last edited:
A very common gadget fitted when Dirtbikes first used long travel suspension, huge chain tension variations happen if the swingarm pivot is a long way off the countershaft sprocket centre. You had the choice of either a bow-tight chain, very bad things happen with that of making the chain so loose that it came off the sprockets. Spondon, Harris ' competitor, fixed that by making those centres coincide.
 
Thanks Piet. Interesting story. Those Harris frames never made a lot of sense to me. I didn't like the look of them. They appeared (to my mind at least) have frame tube joints and bends in the wrong place to carry the loads effectively. But seeing it stripped down so the whole frame structure is visible, The design makes much more sense. Those two tubes that go from the monoshock mount diagonally up to meet the frame backbone near the front of the seat make all the difference. They're partially hidden from view on the assembled bike so I hadn't spotted them before.
Cam,

The Laverda frame is based on a design that Harris built to house Ducati Pantah engines for TT F2 racing. This was actually the bane that eventually put the SFC600 enterprise to sleep, there was no room to fit any sort of induction silencing to make it road legal here in Germany. Even the fit of the carbs is tight! With further R&D the SFC600 COULD have been a very viable proposition, but with the factory going belly-up, the supply of engines disappeared. Uwe Witt had tried to secure a run of Atlas OR600 engines for the project.

Some pics of the sister BoT bike that has gone through a couple of evolution cycles. I well remember packing a set of crankcases to send to Tim after he had cracked the originals at Daytona.

580 Georg.jpg580 Georg Hockenheim rider M.Stöcker.jpg580 Parker.jpgHarris 600 Tim Parker-ex Kühnert.jpg250736179_10217214281943815_4626165218260299244_n.jpg

piet
 
Andy,

One of the challenges we face is to get the noise level down a bit. Both Georg and Günther reported these bikes could cause your ears to bleed at full song. The Nürburgring unfortunately has pretty stringant noise regulations so we're contemplating fitting the underslung 650/668 (!) silencer and retaining the cheeky little meggas instead of fitting a fugly huge silencer each side.;) Painted black, I reckon the bread box will sort of disappear without spoiling the silhouette too much. At least we don't need to fit an oil pan, which would end up looking quite similar.

piet
 
Another item that surprised us a bit during the checks was that Augusto Brettoni opted to retain the balancer bobweight in the engine. This had been modified to run on needle bearings instead of balls, probably contributing greatly to reliability.

pietDSCN1793.JPG
 
… and maybe the whole story of the 5 Harris Laverda’s will presented at the Nürburgring on 22.-23.08.2026
Cheers Michael
 
… and maybe the whole story of the 5 Harris Laverda’s will presented at the Nürburgring on 22.-23.08.2026
Cheers Michael

Not maybe, all owners of the five Moto Witt Harris bikes promised to come over.
First time they come together since they came together at Witt as only frame kits from Harris.
The frames are absolutely different from the Magnums.

Piet, it is going to be a beautiful bike😍.
My race Harris has a 2-1 exhaust with big silencer. Works well
The ex-Wagner has 2-2 silencers. Not the most beautiful for these bikes, I think. But quite enough for the road.
Eva's ex-Parker’s bike had very loud pipes that costed power. Now she fitted new special build lower pipes that are more silent and keeps the power. I will ask her for some pictures.

Here some pictures of the Dutch bikes. They al will come in August. Hope to see you all there!
 

Attachments

  • IMG_0394.jpeg
    IMG_0394.jpeg
    390 KB · Views: 31
  • IMG_1540.jpeg
    IMG_1540.jpeg
    470.6 KB · Views: 31
Otto,

We hope to keep Günthers' bike in as close to period spec as possible. Biggest deviations so far are the front brake discs and the new ignition system which will be invisible. We're very keen to keep the exhaust as original as possible but also be quiet enough to take part. If all goes to plan, that'll be it, apart from new, modern tyres. No 18" slicks available any more. I've got a pair that I last used around 2010, but Günther turned that offer down... :unsure:

piet
 
Back
Top