Needle and needle jet

[ME 109]

Thanks Jeff. I might go from the 2.66 to the 2.68 NJ's and go get some carb cleaner today sometime.

GSPD and FH used 2.68 so I put them in too about 6 months ago. It may not have been completely obvious at the time, but I now feel that the ol' gal goes like a rocket. I pulled over 8 grand in second and third a couple of weeks ago. I think that's ok for a stocky.

[Roy Gavin]

The latter carbs had a different part number for the slide spring , and the springs are noticeably stronger than the early items.

Just something else to play around with, but the the settings for the later cards will only be valid with that spring.

Not nearly as much fun as a SU- they had six springs and six hundred needles to fiddle with, and you could change the viscosity of the oil in the damper too.

Rob Farmer over on the UKGS forum wired in a O2 meter and came up with a settings and air box mods which worked well for him, so a search over there might be worth while.

[SteveD]

[Bob Bennett]

Better fuel consumption now Steve!

[SteveD]

Better fuel consumption now Steve!

I hope so, and maybe a little smoother? It had started to hesitate a little at a constant throttle around 60kph, hence the investigations and parts replacement.

[dwerbil]

I'm waiting a few days for carb kits and new needles/jets for my '84 RS. How again does one take out the old needles from the slide?

[ME 109]

I'm waiting a few days for carb kits and new needles/jets for my '84 RS. How again does one take out the old needles from the slide?

Hold needle tightly in fingers, rotate 90 degrees while pulling needle outwards and the needle will pop out into the next notch. Repeat once or twice as required to remove needle.

When replacing the needle, look into the hole where the needle goes and observe the parallel legs of the retaining clip.
Ensure the first notch on the needle is parallel with said clip and push in. 'Click', the needle is held in the first notch.
Repeat removal technique, but push needle in instead of pulling it out.

*If you don't line the first notch up properly, it is possible to push the needle straight into the second notch

[dwerbil]

ME109, you da man! Thanks much.....

[montmil]

Prior to removing the needles, take an accurate measurement as to how far the needles protrude out of the slide. Replacing the needles in the correct clip notch can occasionally be frustrating. Your original measurements will confirm the correct positioning.

[Darryl Flynn]

Thanks.

So if I leave the carbs on, reinstall the stack from the bottom first, then install the needle/slide/diaphragm from the top ensuring the needle is well centered, I'll be right!

Yes you will and in addition, by doing things that way with the diaghragm off, you can see that the top brass atomiser section ( in photo ) has indeed entered the carb body properly prior to tightening things up. It's easy to get that bit wrong on reassembly unless you are aware of it, which
you now are.

Cheers Darryl