LCGB Forums

Evening all,

Just been out on my first short ride of S3 Li125 with a mugello, only did 5 miles as I wanted to stay local incase of any problems. Local speed limit is almost all 20mph so only got into 3rd a couple of time doing around 30mph.

The setup is

Mugello 186
PHBH 28
Clubman

All from Mike Pheonix and he pre-setup of the carb for my spec. Here's the plug, it's a B8

IMG_1795 by Neil Schofield, on Flickr

IMG_1794 by Neil Schofield, on Flickr

I know it was a very short journey so probably not the best to judge....

Looks light to me but I wouldn't call it white.....

Looks lean....I wouldn't be happy with that.

Have you done a leak test ?

MickYork wrote:Looks lean....I wouldn't be happy with that.

Have you done a leak test ?

Yes did a leak test when I built it, was all good.

I did think it looked a little light

Probably best doing a "full" plug chop, marking the throttle at 1/8, 1/4, 1/2, etc and see where the lean spot is.

Forgot to mention it's running a Ramair filter too. Just looking at the paperwork Mike Pheonix supplied with the carb details

Main Jet - 105
Pilot - 52
Atomiser - AV266
Slide - 40
Needle - X7

That’s no good, you’ve got to use an old well used plug not a new one.

Scooterdude wrote:That’s no good, you’ve got to use an old well used plug not a new one.

Unfortunately I don’t have an old plug to try

B8 to cold for running in, B7 would be my choice until doing carriageway/ Motorway riding.
I think plug colour looks fine

You need to do proper plug chops to get honest readings. There are plenty of online tutorials, such as this one. All you need is a few spark plugs, a hacksaw or a Dremel with a cutting disc, vernier calipers and a vice. Alternatively, fit a wideband UEGO sensor to read your AFR, or take it to your local 2 stroke dyno operator.

Thanks guys, I’ll look into do a plug chop

You won't get good colour on that for a while

I think the light is not helping..

Looking for light mocha brown