High
I once also owned a 150sp, good laugh for sure, I used it a few times on track days and the like, If your going to track it I would recommend that you strip the front forks dig out the piston/valve youll see a large hole to flow the oil through the best thing you can do is weld that up and drill it back out to half its original size, now you will have a little bit of damping.
The carb route is the best bolt on power mod you can do either a 32mm flatside or a Cr later being more fun but both rewarding, also a tyga pipe.
I used Bridgstone BT39 tyres in the super sport copound in 100 front and 130 rear i think excellent choice, but the rims will take gp 125 slicks if you like for real action. Oh dont forget the braided front line apert from that i found the brakes quite good.
Of course a little porting work never goes amiss.
have fun i did
luke f
_________________
Farting is funny