Zane 750 Formula Gearbox - A little sick

Jotaman

Jotaman

Hero member
Location
Verrierdale, Qld
Howdy,
I seem to have struck a wee problem with my 1998 750 Formula, whilst toodeling along during a spot of Malaysian freeway blasting today, my sixth gear became a 6th gear neutral: 1 to 5 no issue, 6th gear selects but just spin's and spins.
I believe 6th sits on a spline, is this type of failure known (32 thousand k's), which one is the culprit. And most importantly are there any aftermarket layshafts/gears available.

She was a good girl however and delivered me home on the remaining selection, i do however suspect they may be a tad farkkeeddd  :-X

Cheers

Peter
ps: As i'm looking at a full strip, probably best to upgrade a little along the way (can we talk about the crank end float - or is that story just spurious rumor)
 
Hi Peter,

You have become victim of the mysteriously disappearing 6th. gear dogs.... :D  Quite common, too!

In good supply at OCT.  No aftermarket items available to my knowledge, only very few CR boxes floating around, these seem to be a bit stronger.

Crank end float isn't the problem, big ends are the culprits, and definitely NOT a rumour!  Might seem ok when you look at it, but, 9 out of 10 are sure to let go sooner or later.  A complete crank rebuild is necessary.

piet
 
Howdy Piet,
The DOG's let go WTF  :o is it just a hardening issue with the gear steel, if that's the case Guido should have had his nuts tempered, that shit can kill you.

I'll drop you a PM directly :)

Cheers

Peter
 
Jotaman said:
......... is it just a hardening issue with the gear steel, if that's the case Guido should have had his nuts tempered, that shit can kill you.
Click to expand...

Yes, quite dangerous, Peter.

Not really a hardening issue, more a design flaw. :o  Once you've got in in your hands, you'll see what I mean.  

The dogs are a bit on the small side and have lots of clearance to their mates.  Enormous shock loads are the result.  Luckily, they simply drop to the depths of the sump without jamming themselves between rotating/meshing gears, a blocked gearbox is not my idea of fun. :o

piet
 
Pal of mine was pitched through a hedge when the gearbox on 3X's demo Formula locked up on him, needless to say he didn't sign the papers. Should ask him what he thinks of Zanes, makes Piet and me sound like big fans.  :) :)



    Keith
 
No need to apologise  Steve, cheap shots are a bit of a forte :)

What ever were they thinking, if only they weren't so fabulous to ride it would be an easy path.



 
Couldn't agree more Peter, they really are a lovely thing to ride.  I've been tempted to grab one many times, particularly with prices so low.  Given everything else I have on my plate at present it is probably best I leave it to you though...
Cheers
Steve B
 
Well - I also second the comments on the ridability, especially if everything works well and the engine has a bit of grunt, just like the last Formula's had (different cams and EFI settings, larger jets etc.).94 HP and 92Nm is still to be beaten on an inline twin with 750ccm I think. Looking at the (dry) weight of 189Kg, you can have tons of fun with these babies, once they run as they should. The list of Problems is well known meanwhile and there are cures to almost any of them. One of the last ones (the "lumpy" run between 2.700 and 3.000) I hope to solve with the new MyECU, once I can find time to fettle around with it... Looks promising though... idle down to 1.200 (from 2.xxx), starting improved. Just need to fix midrange and top-end... "just" I said, right...? :-[
 
Jotaman,

Are you in Malaysia, I'm in KL and a big Laverda fan. Don't have one here but have a 750 SFC replica back in the uk. Previously owned a SFC 1000 and a 78 Jota.

Sorry can't help you out with the Zane stuff.

Cheers

Bill
 
Howdy Bill,
I'm based in Singapore, but will be up at Sepang Friday afternoon, Saturday morning for the Rev Club track days, will have the Formula Racer with me for some gentle lap shake down  ::)

I'll PM you my number if you're able to pop down for a squiz it would be great to catch up :)


Cheers

Peter
 
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