My beta rev 3 125 starts first or second kick but only with throttle held open

Edited March 16, 201511 yr by itstommmm

Are you talking about hot or cold starting or with or without enrichment open?

When the bike is warm it starts first kick perfectly

Suggest carb strip and clean paying particular attention to cold start enrichment mechanism and passages

Edited March 16, 201511 yr by dadof2

what do the cold start enrichment mechanism and passages look like?

https://www.youtube.com/watch?v=1EbXacjIV78

See above, I think your bike has this type of carb

.http://danskkartingcenter.dk/dellorto_motorcycle_carburetor_tuning_guide.pdf

See page 10 of above link

From #5 I guess you are pretty new to working on carbs, may be best if you could find someone local who could work through your carb with you. You could easily make things worse, carbs are delicate