Zane 750 questions.
- Thread starter 1200ts
- Start date
Andy J
Hero member
- Location
- Isle of Man
Yep, and that?s one of my bikes in the photo. I also found out at the weekend where the oil was coming from when I raced it a few weeks back. The oil cooler has gone pop! 
Sir Sidney Ruffdiamond
Hero member
- Location
- Cotwolds
Andy is it worth asking Ben if he has one somewhere - i gave him a T150 cooler that i had in the garage
Laverda SF
Hero member
The (LAVERDA - Name Sake) ZANE Motorcycles (Predigest-er to Aprilla ad KTM) were noted to have wobbly crankshaft end bearings. Too bad the Company didn't last long enough to correct the issue because the ZANE essentially had a great frame, Brakes and suspension for a Hi-Perf mid CC Road Warrior.
Fixes are documented - Providing you know a trusted machinist.
Fixes are documented - Providing you know a trusted machinist.
Andy J said:Make sure you junk the oil filter, fit the alternative 'oil strainer' and change the oil regularly and you may get lucky and have miles of fun on it.
I'm not an advocate for the strainer type filter for many reasons. I recently pushed a crank apart that has been destroyed as a result of the "strainer" filter. Cam chain guide broke, cam chain ran on the alloy inside the motor. Alloy fillings were pumped into the crankshaft slingers, and the surface on the big end pins destroyed.
I've been retro fitting my engines with the much larger surface area Ducati Superbike filters, which are easy and cheap to get.
Alto bikes and bluing on the pins. Perhaps it was not lack of oil supply (a 2 stroke will run on a whisper of oil) but the tolerances between the cage and conrod, and relief points on the conrod, do not allow oil to flow THROUGH the bearing, thus removing heat.
A 750S modded to look like a formula? I wonder if it has the fully floating discs, preload adjusters, Formula intake tubes, formula master cylinders ect ect. All the little things that make the Formula what it is. Just a modded 750S, in my mind not worth as much as a stock 750S, let alone a formula.
Regards, Greg
Cosi
Hero member
- Location
- Kingscliff
The suggestion that the alto and baines was race bikes were somehow near stock is a little misleading....
Paul Marx said:
Just so that Piet doesn't have too repeat what he's said a thousand times
:1. Pins ground 'out of round' by the crankshaft supplier.
2. Bearing clearance over-specified by the factory.
Btw: Never heard of any of these bikes being endurance raced. Anyone know different?
Ventodue said:Just so that Piet doesn't have too repeat what he's said a thousand times
1. Pins ground 'out of round' by the crankshaft supplier.
2. Bearing clearance over-specified by the factory.
Btw: Never heard of any of these bikes being endurance raced. Anyone know different?
Well, I was part of the team for the last official participation of Laverda in the Bol d'Or in 1999 for one.
Paul
As well as various (mostly) unsucessful italian efforts, Team van Dijk campaigned a 750 for a couple of years. Despite a lot of disappointments, they managed to finish a couple of races! Possibly the best-developed Zanes bikes of all time.
piet
piet
Cosi said:
Wasn't at all impressed by an Alto crank that hat shat itself and then found its way onto my workbench...
The filter itself isn't the cause for the failures, but can aggravate the symptoms (nothing to do with the Alto crank failing).
piet
Ventodue said:
A bearing race was slid over the crank pin and held in place by pressure from the opposite web. This works well when the race is under constant pressure, as in old brit singles where the pin was pulled into a taper in the web by a bloody big Jesus nut, but in a parallel fitting interferance fit, the first traces of crank flex will allow the race to loosen itself and spin on the original pin. The result was both the web with integral pin ended knackered, and the race had also worn a helluva groove into the opposite web... into the bin with it all.
Sorry, but that wasn't thought through properly.
piet
Ventodue said:
Bike crashed out in a collective fall around 23.00.
If I remember, it was repaired to run again.
There were 2 bikes, qualified in the last 2 spots.
One campaigned by a French team was out after an hour with a destroyed clutch. They'd spent a lot of time rehearsing wheel changing, brake pad changing and various mechanical interventions using air tools.
Very flash.
That nice air tool buggered the mainshaft when they threaded the clutch nut during rebuild after qualifying.
They didn't understand that the aim was to finish, not gain seconds changing wheels.
The Italian team run by van Dijk used hand tools and took their time.
Paul
.