Ive no luck finding those RS Insulators, but Ive found that the one out of my TM125MX is exactly right, so I have two of those on the way...

Whats this NSR-World airbox?

maxim wrote:You need the RS250 same era insulators which has the left hand one angled off further the to the left and I use the HRC/NSR world airbox, which is essentially a tray covering the whole engine under the carbs. Job done.