Zane Laverda 750

R

rbike

New member
Location
Corwen, North Wales
I've just had my crank back from Germany.
Many many thanks to Piet and Roger at OCT, they did a cracking job.
I would advise anyone to have their crank done. Mine wasn't blown, but I was surprised when Piet showed me the photos of when it was split and the damage caused.
Now for the rebuild. Does anyone know of all the faults with the zane 750 engine?
I already know of the crank, the valve guides which I have had replaced, the battery, starter cable, rectifier, oil feed pipe and oil pressure mod.
Was there something to do with the balancer shaft?
Also, I am converting the 750 to Formula spec and I am short of pistons. I asked OCT, but never had a reply.
Standard Formula or forged pistons? Any advice welcome.
 
rbike said:
I've just had my crank back from Germany.
Many many thanks to Piet and Roger at OCT, they did a cracking job.
I would advise anyone to have their crank done. Mine wasn't blown, but I was surprised when Piet showed me the photos of when it was split and the damage caused.
Now for the rebuild. Does anyone know of all the faults with the zane 750 engine?
I already know of the crank, the valve guides which I have had replaced, the battery, starter cable, rectifier, oil feed pipe and oil pressure mod.
Was there something to do with the balancer shaft?
Also, I am converting the 750 to Formula spec and I am short of pistons. I asked OCT, but never had a reply.
Standard Formula or forged pistons? Any advice welcome.
Click to expand...
Hi,

I wonder if you’re able to tell me please, how much out of interest is a rebuild for the crank? I’m currentry rebuilding a 750s, as AFAIK, the engine is fine, was running ok before I took the bike apart, just in case the engine turns out to be bad when I get it on the road, I was wondering how much pain I’ll be in money wise…..pm me if you prefer.

I think 6 gear is a wear spot, but I don’t believe the replacement gear is stronger, I know there’s a inherent weakness in the box, I don’t know the full story though.

Whats the issue with the oil feed pipe ?

Alistair
 
Hi Alistair,
The cost for my crank all in was about 1350 euros. That included a second hand web, machining, oversize bearings, postage and vat. I was lucky, the conrods were ok.
I've attached some photos to show damage.
The bike has only covered 11,000 miles.
I believe the factory fitted oil pipe to the lower is prone to leaking as fitted by the factory. OCT do a replacement which is sound. They also do a flexible oil pipe to replace the solid pipe on the head.
I am looking for a replacement clutch slave cylinder piston as well if you know someone who has one. Mine was siezed and the only way I could get it out was to drill a hole in it.
Cheers
 

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Hi Gert,
Thanks for the info.
I had seen it before, but the only thing that puts me off is the fact that the serial number for the complete piston assembly is the same as the serial number for the 750S. But I know they are different pistons.
The cost of 436 euros for a pair of pistons is not bad, but I have had a quote from Cambridge pistons to machine forged billets to what I require for 500 to 600 pound. These are complete kits also.
The only problem is the 14 to 18 week lead time.
I just thought I would put the feelers out first.
Cheers
 
rbike said:
Hi Gert,
Thanks for the info.
I had seen it before, but the only thing that puts me off is the fact that the serial number for the complete piston assembly is the same as the serial number for the 750S. But I know they are different pistons.
The cost of 436 euros for a pair of pistons is not bad, but I have had a quote from Cambridge pistons to machine forged billets to what I require for 500 to 600 pound. These are complete kits also.
The only problem is the 14 to 18 week lead time.
I just thought I would put the feelers out first.
Cheers
Click to expand...
Try van Dijk for the pistons.

Paul
 
rbike said:
Hi Alistair,
The cost for my crank all in was about 1350 euros. That included a second hand web, machining, oversize bearings, postage and vat. I was lucky, the conrods were ok.
I've attached some photos to show damage.
The bike has only covered 11,000 miles.
I believe the factory fitted oil pipe to the lower is prone to leaking as fitted by the factory. OCT do a replacement which is sound. They also do a flexible oil pipe to replace the solid pipe on the head.
I am looking for a replacement clutch slave cylinder piston as well if you know someone who has one. Mine was siezed and the only way I could get it out was to drill a hole in it.
Cheers
Click to expand...
Looks like that had been sitting a long time as well.

Paul
 
rbike said:
I've just had my crank back from Germany.
Many many thanks to Piet and Roger at OCT, they did a cracking job.
I would advise anyone to have their crank done. Mine wasn't blown, but I was surprised when Piet showed me the photos of when it was split and the damage caused.
Now for the rebuild. Does anyone know of all the faults with the zane 750 engine?
I already know of the crank, the valve guides which I have had replaced, the battery, starter cable, rectifier, oil feed pipe and oil pressure mod.
Was there something to do with the balancer shaft?
Also, I am converting the 750 to Formula spec and I am short of pistons. I asked OCT, but never had a reply.
Standard Formula or forged pistons? Any advice welcome.
Click to expand...

The balance shaft bob weight can come loose, in stock form it is often held only by the 3 M6 bolts to the shaft with the central nut not doing much in the way of holding on to it. Either the shaft or bob weight need a little machining to allow the nut to pull its weight...

OE pistons are quickly becoming unobtanium. AfaIk, they were all forged.

Lots of minor issues on the Zanes require attention, some can turn out lethal. The stock routing of the rear shock reservoir hose allows it to be pinched by swingarm action or damaged by the drive chain, results in immediate partial collapse of the rear suspension, along with loads of oil all over the place. Guess it could be fun in a long sweeper at 150km/h+. Throttle cable can unlodge itself from the throttle body under certain circumstances, also a lot of fun. All of the intermediate gears of the stock gearbox can fail, C/R boxes are stronger. Quite a few electrical gremlins to attend to as well.

There's a lot more, but I'll refrain, before the Zane mafia sends out their hit-man... ;)

piet
 
Cheers Piet,
I'll fend off the zane mafia, or try to!!
Tell me more, I'm keen to know.
Oh and cheers for the work done.
After what I have seen, it is 1300 euros spent weĺl.
 
rbike said:
Hi Alistair,
The cost for my crank all in was about 1350 euros. That included a second hand web, machining, oversize bearings, postage and vat. I was lucky, the conrods were ok.
I've attached some photos to show damage.
The bike has only covered 11,000 miles.
I believe the factory fitted oil pipe to the lower is prone to leaking as fitted by the factory. OCT do a replacement which is sound. They also do a flexible oil pipe to replace the solid pipe on the head.
I am looking for a replacement clutch slave cylinder piston as well if you know someone who has one. Mine was siezed and the only way I could get it out was to drill a hole in it.
Cheers
Click to expand...
Hi,

Thanks for the reply, it gives me a idea of cost.

as for a clutch piston, you mean the one in the sprocket cover? 3C Moto possibly, you can get the seals, the seals are also on eBay, DAM also has it.

damclassicracing.com.au

LV047002000052 CLUTCH SLAVE PISTON SET 28MM

Laverda Parts for LAVERDA Breganze and Zane models 1969 - 2000
damclassicracing.com.au damclassicracing.com.au

Occasionally, a second hand cover will turn up on eBay too.

Alistair.
 
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