Changing needle jets on M750

[blocbul]

Hi,

I've ordered a new pair of needle jets to change my OEM ones as I'm encountering the typical problems with oval needle jet wear.
My question is how do you remove the needle jets? I'm wondering if I can take them out by just removing the top of the carbs. It seems that needle jets are part of a sort of housing which is slided from upside of the carb ... what I don't know is if it's retained on the below side by any screw or something else?
If I can avoid removing the carbs completely I would appreciate 

[motoxmann]

they do slide out the tops, but they are secured by a bolt on the bottom side in the float bowls.

when you remove the caps from the tops of the carbs, make sure you don't lose the little black o-rings.

circled in red is the bolt that threads into the needle jet. it retains the needle jet and it also retains the actual jet assembly (part the pilot, main, and starter jets thread into) to the bottom of the carb. I've found it easiest to remove that bolt, then pull the entire jet assembly off (careful not to lose the gasket for that part as well), then push the needle jet up sometimes needing to tap it with something to get it started moving, then grab the needle jet from the top to pull it up and out the rest of the way.

[blocbul]

Thank you that's cristal clear!
BTW I'll also check float height (never did it before)

[motoxmann]

BTW I'll also check float height (never did it before)

yes! definitely do! they are usually fairly far off from the factory lol. just make sure you do it correctly, which means two things:
1) bolt the float bowls back on offset to the one edge, hanging off so the flat long side of the bowl is bolted to the inlet edge, making all the jet and float stuff still be exposed, but covering the flange of the float assembly. the float assembly just rests in the carb body and the bowl is what secures and positions it properly. without doing this the float assembly will not sit straight and you'll get an innaccurate measurement. doing this will secure the float assembly straight.
2) tip the carbs so you measure the float height while the floats are pushing the needles to be closed but NOT compressing the spring in the needles. the weight of the floats is enough to fully compress the spring in the needles. play around with it a bit looking at the needle closely as you tip the carb to different angles, you'll see what I mean. you want to measure at the point where it's touching and closed but not compressed