Hi.
The original gearbox was hellishly noisy with a loud whine that change with engine revs in all gears. I bought a replacement box.
The bike is from 2002 but the replacement was 1996 I think I was told.
Issue 1 I needed to swap ‘bell housings’ as the old one didn’t have a flywheel pickup mounting hole.
This box is nice and quiet.
Now found that one of the clutch actuating arm mounting brackets has cracked.
Arse!
So here’s the question.
Are all the internal parts the same between these years?
I need to swap internals to the original newer box housing.
Thanks
Phil
From a quick browse of Guzziology, it doesn’t mention any changes apart from a revised detent pawl to ease the gearchange introduced in 1999.
God luck with the swap.
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Thanks for checking Dan.
I’ll let you know if I’m a happy or frustrated Phil after the weekend. 
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I don’t think swap is that straightforward. Above mentioned pawl is quite a major change, and although - see pic - it seems to be of the same diameters, please note, and judge for yourself, older gearboxes have bullet-shaped “gear stabiliser” hidden under gearbox vent, (bottom right on the pic), while Breva-on generation has this element transferred to the other end of the shaft (top left on the pic). Very old pic and I can’t remember much more. Just be aware of it. And why won’t you just weld that alloy thing?
Thanks for your message. I can see the differences between to and bottom but not the bullet shaped things.
I’ll find out once both in bits.
I don’t have an aluminium welder but may look at this option if I need to.
Here is what will you find under vent screw, at the top of the gearbox. Older one - gear “latch”. Newer one - it’s gone.
It is important to note that the bullet shaped pawl needs to freely move within its orifice to aid easier changes. These gearboxes have straight cut gears and so do whine a lot
CHRIS
Thanks guys.
I ended up swapping the two gearsets and keeping the newer style gear selection shaft.
It works a treat and is still quiet.
Good result.
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So, you were able to put newer type internals into older type alloy housing without problems, am I right?
Well sort of.
The original gearbox bell housing is machined to take a pickup. The replacement didn’t have this so I presumed that the replacement was older maybe using points.
I swapped bell housings when I first fitted the replacement box.
This is how the internals are. Original had the 6 bullet shaped indents and the spring loaded plunger.
The replacement had the normal breather with a long pipe. No bullet shapes, instead a separate spring loaded thing operating on the rear end of the selector shaft.
I’ve ended up with the original gearbox casing with bullet indents and replacement input and output shafts.
With the replacement the gearchange was noticeably better with no false neutrals between gears. Now I’m using the original selector shaft the neutrals are there again if I dont select gear hard enough.
I guess it’s tough luck.
At least its quiet and works.
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Do you know when the newer box version appeared?
The bike is a 02 plate and I thought the change was in 99. Maybe the bike was old stock when registered.
Nobody knows for sure, it seems like old carb-type model had some sluggish sale, and still been in dealerships while new EFI one was already introduced. so, 1999-2002 is a bit of mystery period:)