Standard jet size

[Haako Smith]

What is the standard carb siede for a Yamaha dt 125 R?

[Calum]

For the newer bikes it uses a 210 main jet. Or a 240 for the slightly older flat slide models.

[Haako Smith]

@Calum Are you sure it uses 210 for original 28mm carb. IT seems a bit high dont IT?

[Glynn123]

@Haako-Smith Mikuni jet sizes differ to Keihn etc and flow differently, 210-240 main jet is correct on the standard flat slide 28mm

[Haako Smith]

@Glynn123 oh ok. That makes more sence.do you know what the differnece is? I am now running 146 main jet in a koso 32mm carb, but when i rev it at max it wont go over 8k in rpm.