Thanks Bwaller and TG!
About the extended swingarm... it's actually a 1991 GSX-R 1100 stock swingarm, slightly longer than the original GS unit and the wheelbase of the bike is around 1500mm (59")
Ground clearance is 120mm (4.7")
Stock wheelbase for a 1982 GS is 1510mm, at least that's what the factory stated
I've spent most of my time lately working on my two junior dragbikes, RG 125 (150cc big bore) ridden by my son Jesse like Sam said and Jesse's last season bike GSX-R 50 (80cc big bore) is ridden by a new rider, Patrik.
He seems to be a very promising young drag racer as well
The work I did on the GSX-R 50 last winter improved the 1/8 time by 0.8 seconds and speed is up almost 8km/h. I must be getting better at this 2-stroke sh1t
Oh yeah, special thanks to Sam for his help with the RG, it's gonna run 9's next time out, I promise and Jesse is the guy to do it
Juha