Advice please

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jayteemmm
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Posts: 7
Joined: Tue Mar 15, 2016 8:25 pm
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Main scooter: Lambretta TV175
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Sat May 23, 2020 12:32 pm

Hi
I am currently running in my RT195
Phbl 25 through airbox
Main 100
Aq268 Atomiser
D22 needle bottom clip
60 choke
53 idle
Running rich, seems to splutter when you get to your desired speed
Also running a Gori SS exhaust
Is this a revvy pipe?
I want good torque not speed
Any Information appreciated thx
Hohn

Warkton Tornado No.1
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Joined: Mon Oct 17, 2011 6:16 pm
Main scooter: Lambretta SX200
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Sat May 23, 2020 2:07 pm

I know very little about that range of Dell'Orto, but I suspect that atomiser is too large.

With any engine, the atomiser needs to be JUST big enough to deliver fuel @ WOT. Any bigger & fine tuning of the carburettor goes out of the window as the gap between it & the needle increases.

Anybody unsure of atomiser size (presuming they have the right type!) should remove the main jet & if it revs out clean, then it is too small. That said, I would bet that half the country's Lambrettas fitted with PH range carbs have an atomiser fitted that is too big :roll:

You don't mention slide size. I hope it's about a 45, but that's a guess.

As for the rest, I don't know about that needle, but the pilot looks too big (try a 50) & the main too small. I'd try 125 to start & come down if needs be.

But you really should try a smaller atomiser IMHO & check the slide size to get them sorted as fundamentals because of their major influences through the range. :) You'd be wasting your time with the rest until you have done that.....

jayteemmm
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Joined: Tue Mar 15, 2016 8:25 pm
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Main scooter: Lambretta TV175
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Sat May 23, 2020 3:09 pm

Hi
The slide is 40 i think?
I have not changed it from new
It is std to what dellorto fit
Thx

Grumpy225
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Main scooter: Gori200, rt195, ld150,rb20
Location: Bakersfield, CA
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Sat May 23, 2020 8:13 pm

jayteemmm wrote:
Sat May 23, 2020 12:32 pm
Hi
I am currently running in my RT195
Phbl 25 through airbox
Main 100
Aq268 Atomiser
D22 needle bottom clip
60 choke
53 idle
Running rich, seems to splutter when you get to your desired speed
Also running a Gori SS exhaust
Is this a revvy pipe?
I want good torque not speed
Any Information appreciated thx
Hohn
I’m running a similar set up but with a pod filter

Main 98
Pilot 50
Needle D22 3rd clip
Slide 40
BGM V2 exhaust

At 400’ ASL

Can’t comment on the exhaust you are running but your over all jetting is rich compared to mine and I’m not running through an air box. GPS 70mph max all day.

Warkton Tornado No.1
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Posts: 129
Joined: Mon Oct 17, 2011 6:16 pm
Main scooter: Lambretta SX200
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Sat May 23, 2020 11:11 pm

jayteemmm wrote:
Sat May 23, 2020 3:09 pm
Hi
The slide is 40 i think?
I have not changed it from new
It is std to what dellorto fit
Thx
There's only one way to find out for certain ;)

As for the atomiser size, what I said still stands..... :P

rainbowrunner
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Posts: 84
Joined: Thu Jun 12, 2014 8:07 pm
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Main scooter: Series 2, RT 195
Location: wigan
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Sun May 24, 2020 7:06 pm

apart from exhaust, i,m on a clubman v4, same set up as me except for your clip position, my needle clips in middle, could try dropping your needle down a notch to lean it off a bit and try

cgt75b
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Joined: Thu Sep 22, 2011 8:05 pm
Main scooter: lambretta
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Sun May 24, 2020 8:23 pm

Have you looked through the carburettor jetting section for similar set ups?

Good luck.

Cgt75b

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