Adjusting a PHBL 25

[muddy]

The tickover is a bit low and starting isn't the best so I thought I'd adjust the carb settings. There's 2 adjusters 1 larger one with a spring. The problem is were ever I tun these 2 screws there is no effect on the engine, any suggestions please.

[2ndtimearound]

I`ve just had a lot of messing with mine on a fairly standard TV175 see post below yours & hope I have now sorted it more or less. Have a look on the MB tech site , as there is a lot of info on there about the carb set up.
Basically your big screw should adjust the slide up/down depending on whether you screw it in/out & should increase/decrease revs (take the bellows off & you can see what happens). The small jet at the back adjusts the fuel at tickover/low speed & richens mixture screwing it out, weakens screwing it in. This screw shouldn`t be screwed out too far or it may fall out - have a look on the Broadhurst site - they will take you through it.

Happy reading/fiddling.

[muddy]

Thanks for the info mate

[Cgt75b]

The anti surge washer in the float bow, can this be removed without issue, or does it need too stay in there ?

Cheers

Sorry for plonking on the end, didn't want to start another thread.

[rossclark]

I'd say dellorto put that there for a reason, leave it be.

[Cgt75b]

Fair point taken. But the question still remains is there any ill effects to running it without ? Innocenti built scooters that shouldn't go 100 mph but some do!

[2ndtimearound]

Maybe I`m blind, but I`ve had my PHBL 25mm to bits quite a few times changing jets & I`ve never seen an anti surge washer in the float bowl - I assume looking at the parts diagram it just sits over the jet to stop fuel slopping about when you`re going for it?
For what it`s worth, mine has been on a 190 cylinder & I never noticed any bad running on acceleration/cornering.

[northernpete]

Can I ask what manifold you guys are using....I have a phbl 24as carb (same body I believe) and can't get a manifold to fit ( solid mount,185 barrel)