the carb needed cleaning on my evo 300 so I stripped it down and carb cleaner and air lined it all jets etc was clear. put it back together and it will tick over but bogs down or dies when revved. 

it will run nere on perfect with the choke on or the air mixture screw all the way in. 

ive stripped it back down a few times and cleaned it again but I'm thinking a bit dirt is trapped beneath the pilot jet which I cant seem to get out? 

do those security torx screws need to come out or is there a specific way to blow through that circuit?

ive got a trial tomorrow and going to have to borrow my dads carb but want to get this sorted asap.

would I be right in thinking theres a bit of dirt trapped near the tiny exit hole and be better getting the security torx fitting to clean inside the tower better? 

 You might have screwed it with carb cleaner and air. The o ring under the tower (torx screws) is not available. You enter at your own risk. You could try just contact cleaner through the pilot jet. There is two holes it should come out . Under the slide and in front of the slide.

ill give it a go tomorrow the pilot jet is clear so must be inside the tower where its blown deeper in to the small hole exit. ill keep trying to flush it out before opening it up

Not sure what its called but you might have blown out the brass ferrule that the needle slides through

as above, if you took the main jet out and put air through the carb you could blow the brass needle guide out which would give you these symptoms, easy done.

needle jet

that may be the problem thinking about it. the brass needle jet did fly out but I noticed and put it back. 

although I put it in from the top of the carb. should it go in from the bottom under the main jet holder?

Hi Dan, Most likely as others say, the needle jet has dropped out and is lying on your bench somewhere.

Having had Betas for years, I made this up, maybe this will help! 

Splatshop sell all Keihin PWK28 spares.

 

 

 

Evo Carb - Removing & Cleaning 2017.pdf

You have the needle jet thingy upside down. Common mistake. It’s held in place by the main jet holder.

1 hour ago, dan williams said:

You have the needle jet thingy upside down. Common mistake. It’s held in place by the main jet holder.

cheers mate I was in the shed first thing this morning I looked at the beta spares and seen the order and already had a feeling it was that. started it up at the trial and ran perfect all day. 

i stripped and cleaned the carb on my '01 rev3 and the next day it kept dying on me, although on tick over and lower revs it ran fine.

after reading the beta carb tweak page i checked my floats and sure enough the little pin had rotated slightly (i'm guessing when i blew air around) and was catching one float (you can see where it was catching the plastic) so i wasnt getting a full bowl of fuel.

When you have the carb apart, take out the float bowl pin (if it hasn't already fallen on the floor!) hold it on a vice and smack one end of the pin. Not to much, just enough so that when you put the pin back in it will stay in place and not move back and forth freely.