Just stripping down my 05 rev3 125 after buying it. Its the turn of the carb now. Intrigued as to why the two carb breathing pipes are linked together onto each other. Firstly are these breather or overflow pipes ? Secondly should they be linked or independent?

Edited April 25, 201313 yr by gazzaecowarrior

They should not be linked unless there is a breather hole!

It's a common mod to link the pipes together,on the rev 3 to cure the syphoning that happens alot on this bike,normaly done after the carb fix mod http://www.trialspor...Manuals/mikuni/ http://www.ntxtrials...ers/RCR0106.pdf check out the links,don't know if yours was done the same way.

Edited April 26, 201313 yr by bilks

It's a common mod to link the pipes together,on the rev 3 to cure the syphoning that happens alot on this bike,normaly done after the carb fix mod

Vent tubes have to vent. Just cut a hole in the middle of the two!

Vent tubes have to vent. Just cut a hole in the middle of the two!

Couldn't agree more. I wouldn't be surprised if i have to adjust the air screw once the system is vented rather than closed. Is it still 2 1\2 turns out approx on these little 125's ?

No mine doesn't look like that. Mine is routed one onto the other with no t section. My carb is a different one to the 250 carb. I don't think my set up is right though as its not vented. Agree ?

I thik the rev3 125 have the VHST. The ports should be linked together but there must be a breather hole in the tube under the carb. It use an idle mixture screw, not an air screw. More turns out is richer mixture at idle. Normally it would be around 1 1/2 turns out.

/carl

Edited April 27, 201313 yr by carl ekblom

I thik the rev3 125 have the VHST. The ports should be linked together but there must be a breather hole in the tube under the carb. It use an idle mixture screw, not an air screw. More turns out is richer mixture at idle. Normally it would be around 1 1/2 turns out.

/carl

Yes it is that carb.