I am not sure why anyone would want a vacuum fuel valve on a TTR250???
The TTR250 does not suffer from hard starting at any given time (hot or cold) so there is no need to change the pet****. The carb also fills faster than it can drain. It would only mean that you have more parts to replace (diaphragm etc.) and also run the risk of fuel leaking into the engine via the vacuum line.
You may have a good reason for wanting this but I cannot see why myself?
Jarrah
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2000 TT-R250M-
Spoiler
Ported & polished, 73mm bore, Wizeco piston, US header pipe, FMF Q4, #150 main jet, #52.5 pilot jet, throttle stop screw adjusted, larger snorkel, GYT-R air filter, NGK Iridium spark plug, 14/51 gearing, NOS +
