Gear change won't - SFC 1000

moalboal

moalboal

Junior member
Location
Z?rich, Switzerland
Hi all

Went for a "last ride of the year" down to Vevey yesterday, planning to come back to Z?rich today via the French Jura. Left my friends place this morning, up through the gearbox: 1st, 2nd, 3rd, 4th . . . where's 4th? Tried going down again . . . where's 2nd? Found I was stuck in 3rd, got back to my friends flat and called out recovery to get the bike to Z?rich :(.

There is full movement on the gear lever still so I think the selector fork return spring(?) has broken *again*. Happened three/four years ago and as I remember cost an arm and a leg to replace because of the difficulty in getting to the 50 cent spring. Has anyone any thoughts about possible other causes or how difficult it is to get the problem area. If this has happened before could it be indicative of another problem? As I recall accessing the spring means splitting the crankcases . . . .

Unhappy last ride but at least I could wait for the recovery (who were very quick) in the warm with a cup of tea!

Cheers

Simon.
 
Could well be that little sucker! How timely this question is, I was in the shed looking at my bare bottom case, and contemplating that springs pain in the arse reputaion. So, how's this for a thought?

Phil made mention some time ago about welding a boss under the case to drain oil out quckly: With that in mind, whould it not be possible to make up a plate, similar size and design to the oil filter plate, so that a bent pair of longnose pliars could remove/replace that tricky little sucker, without splitting the cases?

 
chrisk said:
Phil made mention some time ago about welding a boss under the case to drain oil out quckly: With that in mind, whould it not be possible to make up a plate, similar size and design to the oil filter plate, so that a bent pair of longnose pliars could remove/replace that tricky little sucker, without splitting the cases?
Click to expand...

No chance, the return spring in the 120 engines is located behind the clutch.  Cheap to replace, about a 1/2 hours work and a gasket.  Not exactly something for a roadside repair, but easy nontheless.

piet

 
I gathered that Chris... :D

The springs in the 750 and 180 triples very rarely give up, haven't come across one in over 30 years of mucking around with them.  Come to think of it, I've never even replaced one either!

It's the gear change lever return springs that give up now and then, but also easy and quick to replace.

piet
 
Dellortoman said:
Eh? In what way is it better to have a crappy spring that's prone to break?
Or in the words of Pauline Hanson, "Please explain"
Click to expand...

Easier to replace? I don't know, just stirring..... :D :D
 
I assume Drikko meant that ironically...

On the other hand: the 120? are so much faster, they can afford a broken selector spring during a 4h race easily...  :LOL: :LOL: :LOL:
 
took my jota out for a spin, just before our trip to italy in may and lost all my gears apart from 1st .took the triangle cover of and the eccentric gear selector locking nut had come lose. 20000 miles after its rebuild. hope its as simple as that :D
regards andy
 
A simple get you home bodge should the gear selector return spring break is a bungee cord/piece of old inner tube hooked around the gear lever and tensioned in such a way to hold the gear lever roughly in the middle of its travel. Works a treat.
 
Hi Andy,

had that very same fault some years ago on the way from Willi Werndl's meeting (2006?) back home. Stopped at a parking-place close to the Autobahn where a group of Honda and BMW riders were sitting, having a rest. I asked them if they could hold the bike a bit leaned over to the left so that not to much oil would come out of the engine, which they did. Opened the shifting cover, did expect a broken spring but that was not the case. remembered how I adjusted the screw and saw it was in a different angle. turned it again in the right position, fastened the counter nut, re-installed everything and after shifting the gearbox through faultlessly, I thanked them for their help and went home. At home I secured that adjuster screw with loctight, never had an issue ever since. that said, I also haven't cracked the 20.000km since then with that bike...  :-[
 
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