@Calum 

This is all the manual says about jets and reed valves

The bike is no longer restricted

I believe so, what size jet would i need ?

@Calum it has a giannelli down pipe and dep sport end can

When my DT get's into 5th and 6th it starts to lose power and struggles to pick up revs, does anyone have any ideas why?

I'm looking for decals for my '02 yamaha dt125r and I was wondering if anyone knows where to get good quality decals from.

Today I (foolishly) ran out of oil while riding my 02 Yamaha dt 125r ran out of oil while riding (not fast) which resulted in my bike dying, I then put oil in my bike, kicked it over slowly a few times and then kicked it over and started it, it was running fine for about 60ft, then it died. since then I started the bike a few times and revved it which then lead to it dying (no rattling or anything, sounds like the engine is starving but I have both oil and petrol). The bike was extremely hot when I ran out of oil.

I currently do not know what is wrong with the bike, as it starts I am lead to believe that it isn't heat seized. If anyone knows what is wrong with it or could help in anyway please could you get in contact or reply to this thread, it would be greatly appreciated.

P.s. My engine was fully rebuild to factory standard in December of 2018, this incident happened on the 18th of February 2019. I haven't tampered with anything or changed anything to do with the bike since.

Thank you for your help.