Scooterotica

rapido 250, af 48 mm big bore, gt 60 x 110 crank ,mammoth head, cyclone gearbox, 30 mil phbh, 40 slide, 70 choke, 130 main, av 268, 70 choke . x 13 needle , breath sweet filter.

dave wheeler wrote:TV175, standard barrel, matched ports, scootopia clubman
24mm dellorto phbl
slide 40
choke 60
pilot 50
atomiser AQ264
needle D22, third notch
main 100

Is this set up running through the airbox,and if so is it a TV2 or a TV3?

Engine: 175, a Li 150 cylinder bored out to 175, no modification to ports.
Exhaust: BGM Clubman
Carb: Dellorto(scootopia) SH2/22
Main jet: 142
Pilot: 50
GP200 slide & atomizer
Smooth rubber elbow and good quality foam filter. (Binned the airbox)

At around-town driving, 1/2-3/4 throttle my if was white with a 123 main, and stayed like that as kept increasing. Not until 140 I started to get colour and at 142 it's perfect. It seams like a huge main jet, but on this primitive carb It's the ratio of atomizer to main that is important.

ts230 30mm phbh
main 125
pilot 53
x7 2nd clip
av266
40 slide
60 choke

ts230
30mm vhsh
main 160
pilot 45
dp266
k21 on 2nd
300 float
50 slide

rb200
30mmvhsh
main 155
pilot 55
dp266
k21 on 2nd
50 slide
300 float

ts1 230 with 34mm dellorto
165 main
52 pilot with cd1
dp266
k21 on 2nd
300 float
40 slide
runs great

Mugello 186 top end
Matched ports
Engine SX150
Std crank
46/16 150 li gearbox
Franspeed supertourer
30mm delly phbh open mouthed
120 main
55 pilot
AV268
X7 1st clip
40 slide

Dyno’d @ 18bhp

Just checking the numbers on my TMX27 carb (Imola 186) that I posted on here in 2009. I see posts virtually every day on Faecebook about jetting PHBH carbs and the hundreds (if not thousands) of variations you can come up with between needle, slide and atomiser. Never had those issues with my Mikuni. My TMX jetting worked on day one (pre 2009) and has never been touched, even had it dyno'd without needing any AFR adjustment. One thing I did do though was that I had to remove the power jet (260 main, 50 power jet = 310) as the feed pipe rubbed on something and wore a hole in it, so I temporarily fitted a 310 main and blocked off the power jet. It runs just the same, had that dyno'd too. Also have a Mugello 225 that I could never get to run well on a 26mm PHBH, so much so that I holed the piston after leaning it off too much doing plug chops (maybe the M55 isn't the best place to do plug chops), I didn't have a spare piston but had a TS1 piston and an LTH reed valve and inlet so thought less stick that on. Figured I'd built it correctly but I couldn't get it to start with the PHBH car,b convinced it was that I took the Mikuni off the Imola and tried that, fired up straight away, again not touched the jetting and several years later it's still on there running great on the odd occasion that I do any riding. There's a moral in there somewhere but I've given up trying to convert people years ago.