[EMSRacer07]

Originally Posted by choneofakind

Using TB's from EU-spec 250's (also 28mm I think) has been done in the past with other ecotrons converts.

I'd assume you could use the TB's from the 300, however, I think you'd have to do something about secondary butterflies. Like remove them. If it's like the EU 250R TB's, it's a dead-end fuel rail instead of the version ecotrons uses with the return line, which makes the plumbing easier.

My only worry about using TB's from the 300 is the injector size. What is the ID of those TB's? 32mm?

Installing OEM tbs from the 250's or 300 you would have to take out the secondary butterflies for the ecotrons system to work. Guy on here did it with the oem 250 tbs with ecotron system with great ease.

I am using the ninja 300 motor on my bike and ecotrons fuel pump and regulator. Like you said its a bit easier since less plumbing but it was a pain to get all the air bubbles out with a dead end rail.

From what I could tell when I had everything off the bike the ecotron tbs were just a tad bit smaller than the 300 tbs. But the 300 tbs open big and tappers down when its feeding towards the head.