Scooterotica

Need a bit of advice, I have just fitted a 28mm PHBH to my lammy stage 4 200cc with a sterling pipe. I have been advised to run it with a 115 main jet and a X7 needle on the second clip. It had a 118 main in it and a X2 needle, I have swapped the main jet over but don't have any spare needles, will the X2 needle be ok for now? What do the different numbers mean? Is a X7 leaner or richer? Can't check how its running now cos of this shitty weather.

X2 is richer than X7

I'd do some plug chops

Cheers matey, will moving the clips on the X2 needle help for now? I have not messed with big carbs for ages. Does it richen if you move the clip down?

yes it does........
moving the clip down raises the needle........so letting more fuel through........

Watch this site, very useful regarding dell'orto needles ofa lla carbs.

http://www.vespa-servizio.com/carburato ... dell-orto/

cheers for that, very helpful. I just need it to stop raining then I can give it a go, dont want it badly set up as its still being run in.

Excuse my ignorance, but when you speak of 1st or 2nd clip, is that from the top or the bottom?

from the top usually................

The X2 needle is usually associated with the AV rang of atomisers. If you run an AS266 atomiser the X2 needle would be about right. With, say an AV264 the X7 would be somewhere near or X13 115/118 main is about right. There is no substitute for having it dynoed though.