This is the best time to travel to Leh-Ladakh via Manali / Srinagar on the bike. Breathtaking views and seamless ride with make it all the more amazing. Just a suggestion: Try contact some groups who arrange such kind of road trips. They may give you a better perspective and also share their experie
Well I may suggest you to join an bikers group because traveling solo is good but in case of emergency it will be very helpful if you have a group with back up vehicle. There are many travel agency you can search online and join them.