Scooterotica

I have just refitted my engine after having some top end work done, anyway I ran it up yesterday with a few problems with the gearbox (Indian GP with 19 T front sprocket) I have had this gearbox in the scoot for about 4 years with no problems;
1. Jumping in and out of 2nd gear
2. Can't select 4th gear (I have just fitted a new selector arm)
3. As I was entering my drive the rear wheel locked up.

I stripped the engine this morning and found that one of the teeth had broken off the Christmas tree (3rd gear) so that explains the wheel locking up at least!
On inspection of the loose gears I found that one of them (2nd gear) is stamped Innocenti, is this normal/ usual for an Indian gearbox or has some one replaced a gear over its life, are they interchangeable? Could this cause the jumping gear or is it more likely I have put second gear the wrong way round....could this have caused the broken tooth?
Regarding the gear selector it was possible to select 4th manually with the engine out but with the linkage and the rubber boot fitted it does get close to the casing, and the angle of the linkage looks pretty close to its limit in terms of leverage....maybe I can turn it one spline but will that affect first-year selection?

Any advice or input appreciated

Cheers
Barry

If gear was put in wrong way this would defo cause you issues. Ive in the past had to file some off the back of the gear tie rod to stop it fouling. There is a bit in stickys book iirc on where the selector should be positioned on the splines.

Thanks for the feedback, I have turned the selector arm one spline and all seems well now. Just need a new gear cluster and maybe a replacement for the Innocenti 2nd gear... If anyone has either item surplus to requirements
Cheers

if you fitted the rubber cover on the inner cables this can cause it to jump out of 4th gear a well known issue, if your wishbone is snagging the case inside is something to check when moving it towards the hub bearing, you wont be the first or last to fit a loose gear the wrong way round.