Gear issues SIL GP

Hi There,
Im just running through snags from my recent build and Im having a right game with the gears.
I go through the process , set on neutral at handlbar (and have someone hold in neutral position), do the nearest to wheel cable up first, check it goes in 1st gear OK at the handlbar, then back to neutral and set up outer gear cable. I then put a slight bit more tension in both cables but not too tight.
I then jump on for a test ride and after a while of use, the gears slowly reposition at the handlebars...and everything is way out in terms of handlbar gear marking. The gear also become difficult to engage at the handlbar.
Before I get deeper into the issue -Any ideas?
I did replace the gearbox as part of my build and got it working well on the bench.
The cable and liners are all new and I just rechecked the gear linkage and brackets on the casing which are all tight.
I will take the headset cover off and see whats happening a the handlbar internals first before I stick the scoot on the workshop lift.
The fact all the gears shift position at the handlebars is a weird one.
Is it the cable liner runs or gear box related.. Anyone ever experienced a similar issue?
The clutch seems fine and have the Uni Multi Clutch with AF 6 plate.
Cheers
JD
Im just running through snags from my recent build and Im having a right game with the gears.
I go through the process , set on neutral at handlbar (and have someone hold in neutral position), do the nearest to wheel cable up first, check it goes in 1st gear OK at the handlbar, then back to neutral and set up outer gear cable. I then put a slight bit more tension in both cables but not too tight.
I then jump on for a test ride and after a while of use, the gears slowly reposition at the handlebars...and everything is way out in terms of handlbar gear marking. The gear also become difficult to engage at the handlbar.
Before I get deeper into the issue -Any ideas?
I did replace the gearbox as part of my build and got it working well on the bench.
The cable and liners are all new and I just rechecked the gear linkage and brackets on the casing which are all tight.
I will take the headset cover off and see whats happening a the handlbar internals first before I stick the scoot on the workshop lift.
The fact all the gears shift position at the handlebars is a weird one.
Is it the cable liner runs or gear box related.. Anyone ever experienced a similar issue?
The clutch seems fine and have the Uni Multi Clutch with AF 6 plate.
Cheers
JD