This is a Spaco/Dellorto carb from SIP. I have had it on the scoot for a couple of years but have never been entirely happy with the tickover.
When I replaced the original carb with this one, I swapped out the airscrew from the original Dellorto as the new one was longer and would have needed the bung permanently removing from the back of the air box.
I have just noticed that the profile of the airscrew (the original is the smaller silver one) is slightly different (it's fatter at the end). Would this make a difference?
You may be thinking why not try with the other brass one. Unfortunately, it now transpires that they have a different pitch and when I replaced it I must have forced it in and changed the pitch in the alloy carb on the making
Vespa Rally 200 SI24/24 tickover
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ooohhh ! easy mistake when new to vespas - did it myself when I first fitted a carb with the longer later type and there is different bung for the back of the carb
gaz
gaz
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Lucky then I didn't do that - couldn't get the fecker aligned because of the position of the carb compared to the hole.
"Our dilemma is that we hate change and love it at the same time; what we really want is for things to remain the same but get better."
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I have tried it at various different positions including 2.5 turns. No material difference which makes me think the profile of the end of the airscrew does have an effect. I appreciate that there could be other reasons for the poor tickover including the warming up of the weather and an airleak but I am struggling to sort it.
If I had to get another carb and use the correct longer air screw is there really a bung that would cover the screw as it'll stick out of the back of the airbox by a couple of centimetres?
If I had to get another carb and use the correct longer air screw is there really a bung that would cover the screw as it'll stick out of the back of the airbox by a couple of centimetres?
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http://www.sip-scootershop.com/main/bas ... anguage=enstorkfoot wrote:If I had to get another carb and use the correct longer air screw is there really a bung that would cover the screw as it'll stick out of the back of the airbox by a couple of centimetres?
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To me the silver one looks like a T5 air screw, (1.5mm tip), the rally/P200 air screws have slightly thinner 1mm tip ...............................I think
I had exactly the same problem with unruly tickover until I realised the difference
I had exactly the same problem with unruly tickover until I realised the difference
2Ronnies sc.......Chuckleism is the way forward
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Scoot was in a shed from '77 until 2 or 3 years ago so I doubt it ever saw a T5
I am still playing around and it was a little better going to work and back today. A hunting and lumpy tickover just does my head in especially as I am often in stop/ start traffic going to work.
If I haven't sorted it by the weekend, I'll bite the bullet and get another carb. They aren't too expensive to be honest.
Thanks for all your help and ideas
Ps, Baz I think my improvement today was because I had it 2.5 turns out
I am still playing around and it was a little better going to work and back today. A hunting and lumpy tickover just does my head in especially as I am often in stop/ start traffic going to work.
If I haven't sorted it by the weekend, I'll bite the bullet and get another carb. They aren't too expensive to be honest.
Thanks for all your help and ideas
Ps, Baz I think my improvement today was because I had it 2.5 turns out
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storkfoot wrote:Scoot was in a shed from '77 until 2 or 3 years ago so I doubt it ever saw a T5
I am still playing around and it was a little better going to work and back today. A hunting and lumpy tickover just does my head in especially as I am often in stop/ start traffic going to work.
If I haven't sorted it by the weekend, I'll bite the bullet and get another carb. They aren't too expensive to be honest.
Thanks for all your help and ideas
Ps, Baz I think my improvement today was because I had it 2.5 turns out
Did you try the old carb mate , did you not get it ultra sonically cleaned ?
memory of a fish again
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Yes, I did get it ultrasonically cleaned but the scoot just wouldn't rev. I thought about taking it back and asking the lad to give it another go in the cleaner but when I saw that carbs were only £60 or so, I thought it wasn't worth it, mate.