Try www.rebelgears.com I would think they could help you out. Doug and Sandy are AWESOME peeps to deal with.
WWW.ROBBSRACINGENGINES.COM
Robbs Racing Engines 2003 NEATV-MX Engine Builder of the Year.
#7 Robbie Leonard
2002 50cc stock Class Champion NEATV-MX
2003 50cc Mod. Class Champion/70 mod. 2nd. place NEATV-MX
2004 70cc Mod. Class Champion/90 Prod. 2nd. place NEATV-MX
2005 GNC-MX 90 Prod. Jr 3rd & 70 Mod.2nd.
2006 NEATV-MX 90 Mod. & 90 Jr. Champion
#7X Devin Leonard
2006 NEATV-MX 50 Limited 3rd & 70 Prod. 3rd