Carb dunce

[#1GP200]

As above really . Trying to set carb up but it`s bogging down slightly when pulling away, seems ok mid throttle onwards.
So what needle do i change?
Also, can someone explain what is meant by "plug chops".
185 Ally barrel, 30mil dellorto, AF 42mil clubman.
Yours in carb duncery.

[Muttley McLadd]

What's in it now, jetwise?

[Darrell Taylor]

spend some time adjusting the mixture screw in or out between 1/4 and 3 turns out to find the best setting that pulls away cleanest if you find it needs 1/4 or 3 then the pilot jet may need changing a size
then try the needle on a clip lower/higher and find best setting or may need another needle
if it doesnt clean up then may need a bigger slide cutaway
the problem with this type of set up is that what normally responds best may be too lean and cause engine damage,do you have a local reputable 2 stroke dyno you could set up on

[#1GP200]

Muttley,
Main 122
Two jets marked 70 and 55 don`t know which ones the starter or pilot
Slide 50
X7 needle 2nd clip
AV266


Cheers for tickover screw tip, will try that. will be getting it dyno`d shortly but want to do a few miles first as it`s been built from bare casings, new crank, barrel, piston etc.
Plug chops ??? Anyone???

[Muttley McLadd]

55 will be the pilot and 70 the choke.
55 seems a tad high to me, but stand to be corrected. I've got a 45 or a 48 in my 185. 122 seems very high too. I'd try a 48 pilot and see how that goes. How does it feel at high revs? Does it bog?

[#1GP200]

Cheers Muttley, food for thought there. literally just built engine and as it`s not run in yet i`ve been pretty conservative with the throttle so not done too much at high revs, but seems ok when i did open her up.
I suppose the answer`s getting it dyno`d.
Just looked up other peoples settings and it does seem pilot and main jet are a little on the big side.
Cheers for advice.

[onefortheroad]

Aren't plug chops where you kill the engine at various speeds/ throttle ranges and then whip out the plug to see what colour it is/ whether it's running rich or lean.

Eg. You would ride around the block at a fairly constant mid throttle, kill the engine whilst still running, roll to a stop, pull out you plug and have a look?

[warts]

Page 155 gives you the answer to your question. Highly respected author and tome.

http://www.vintagesleds.com/library/man ... ndbook.pdf
http://www.strappe.com/plugs.html

Read and apply. Release the genius in yourself.

[#1GP200]

Cheers onefortheroad thought that`s what they were but wasn`t sure.
And cheers warts, didn`t realise there was so much to know about the humble spark plug.
Lambrettas eh?? you never stop learning..