RE: ESM 50cc Spitfire Assembly
HiRoger,
Sorry its taken me a while but had to replace my digital calliper. My spare tube measures:
5.128" or 130.29 mm at the engine mount end and 130.51mm at rear end.
If i remember mine was a tight fit.
Hope this helps you. Anything else you need just let me know.
I also have a spare fuz so if you require anything just ask.
Cheers
DB