84 RM 125 HELP PLEASE

[rm nut]

I HAVE JUST GOT A BRAND NEW CARBIE FROM USA  TRYING TO JET IT RIGHT IT CAME WITH A 280 MAIN JET CAN SOMEONE PLEASE TELL ME WHAT JET THEY USE TO GET THEM TO RUN RIGHT CAN NOT GET IT TO RUN RIGHT UNDER LOAD HAVE MOVED NEEDLE TO TOP NOTCH ANY HELP WOULD BE GREAT THANKS GAZ

[D project]

#250 main,R-0 or R-2 needle jet 6EPO5 second clip, #35 pilot jet.
You will probably need to pull it apart and check what you have in it as I think only the slide and pilot jet are correct

[rm nut]

THANKS FOR THE HELP WILL GIVE A 250 A TRY

[BAHNZY]

http://ozvmx.com/community/index.php?topic=17126.msg171909#msg171909

[mudguard]

It also depends on what expansion chamber you have on the bike. A mate of mine has run different types, and has had to re-jet the carby to suit each one.

[oldyzman]

I heard of a mikuni carb brand new from the states which would not work well under load.
It had too small of a Seat and needle sized to suit a snowmobile which has a fuel pump and when hooked up to a bike fuel fed by gravity it was starving of fuel under load down the straight an nepean
Brett

[rm nut]

thanks all for your help have been trying to get this right for over 2 year pulling my hair out will give your tips a try 

[rm nut]

getting closer changed main jet from a 280 to a 250 made a differance but still boggy till you hit the band it has a 50 pilot jet 389q2 needle jet and sfp17 jet needle any one have any ideas to try next thanks gazza

[oldfart]

Neddle should have a long thin taper from factory ...."D project" is onto it, pull all you old jets and neddle sout of the old and transfer the  into the new carb and it should be close.
Did You check the intake sizes ( ID ) to see if there is any diffrence  32 >34

[rm nut]

the old carbie never ran right going to try small pilot jet around 35 it is so close it is not funny starts first kick idles great goes through the gears in band great just boggy down low thanks gazza

[D project]

Hey,don't forget it's a 125 .
All the tests I have read on that model describe it as a top end motor.
Mine works ok with those I have listed

[suzuki59]

Yes as D project said this model is a top end machine.I used to race one and it wasn't the greatest powerband and pretty non existent down low.

[rm nut]

i just got a 35 pilot sent from melbourn today and my old carbie has a 6epo5 needle o2 needle jet and i have a 250 main hope to put in tonight finger cross thanks all will let you know how i went

[rm nut]

happy as a pig in mud the old girl runs like a dream thanks every one for your tip couldnt of happened with out yous if you lived in newcastle i would by yous a beer may be we might meet on the vmx seen one day finaly after 3 year have to put some new pads in it now so i can stop it thank again gazza

[whitey 43]

You will corner quicker if you dont replace the pads/shoes...