Just fitted an M-tech and am happy with it after a bit of fettling to the stator .
My question is why does it affect the slow running jetting so much . I had to go down a size on my PWK pilot jet to get the mixture screw to have any effect at all ?
I`m not the brightest about the in depth technicalities of how timing affects jetting ?
I went up a main jet one size and down a pilot jet one.
Just like to understand it really
Jetting after M-Tech
- coaster
- registered user
- Posts: 3125
- Joined: Wed Jan 07, 2009 12:35 pm
- Location: London and Norfolk
- Contact:
Probably would depend on which ignition curve you selected, some retard a little, then advance a lot and then retard a lot. That is bound to affect the way that the fuel is burnt at different points in the rev range.
-
- registered user
- Posts: 325
- Joined: Wed Sep 22, 2010 10:28 am
- Main scooter: Lambretta
- Contact:
It retards now from 23 all the way down to 16 now . Setting number 8 on the box .
So it burns less fuel as its more advanced ...or at least burns it more efficiently and therefore requires less. ? Is that right ?
So it burns less fuel as its more advanced ...or at least burns it more efficiently and therefore requires less. ? Is that right ?
- drunkmunkey6969
- Moderator
- Posts: 2838
- Joined: Sun Jan 04, 2009 1:42 pm
- Main scooter: '69 Lambretta GP
- Location: North Yorkshire
- Contact:
Generally speaking, you'd fuel the advance.
Sent from my iPhone using Tapatalk
Sent from my iPhone using Tapatalk
See our YouTube scooter channel for Tech-help: https://www.youtube.com/c/TheScooterFactory/videos
-
- registered user
- Posts: 325
- Joined: Wed Sep 22, 2010 10:28 am
- Main scooter: Lambretta
- Contact:
So I`d seem to have gone a bit arse backwards by a small amount.
I've definitely gone too rich lower down . The dropping of the pilot one size has brought the mixture screw back into range after a turn and it seems fine so I`ll leave it a that and keep plug chopping . tidy
I've definitely gone too rich lower down . The dropping of the pilot one size has brought the mixture screw back into range after a turn and it seems fine so I`ll leave it a that and keep plug chopping . tidy