400/4 Jumping out of gear

[Davelu88]

400/4 jumping out of 1st gear back into neutral, don't do it in other gears, I have adjusted clutch  by the manual to the best of my ability which isn't much!! but no joy, any help greatly appreciated.

[ka-ja]

Worst scenario is the dogs or slots on the gears have worn to slight tapers, but 1st gear might not be fully engaged, I would take a look at the selector mechanism if the fault persists

[Davelu88]

Many Thanks

[Bryanj]

40 was the best box and rarely gave trouble, is the gearlever movement blocked or lever bent>

[Davelu88]

Not to my knowledge , it was ok then the other day was jumping out of 1st when pulling away , I had to adjust the clutch as had a bit of slippage and that seems a bit better but gear still jumps

[Bryanj]

Very unusual, you need to check the change/detent mechanism behind the clutch. Do it soon as if it is the detent it will wear all the gear dogs

[Davelu88]

Engines coming out for a rebuild soon , so will stop riding it until sorted , thanks for info

[Nurse Julie]

👍👍👍

[Davelu88]

In fact I took it out today in anticipation lol

[Athame57]

I had this sort of problem for a few weeks recently, 1st gear would only engage and stay so if the engine was still cold after which it was lost. I messed with the clutch no end and worried about needing to split the crank. I had this trouble as soon as I bought her so I had the hump with the seller, an online classic bikes seller.
Then a hunch and I discovered all I ever had to do was adjust the gear change lever a few millimeters! Works fine now.

[Davelu88]

Thanks for that , i have now taken the engine out as its getting a rebuild soon , but as i was coming to undo the gear linkage i noticed it was loose but then i had the (had i or hadnt i just undone that thought ) so im hoping it was just a loose gear linkage.