After a few minutes of fast motorway riding, if I pull in the clutch and close the throttle, the revs go sky high before gradually reducing unevenly over 10 or 15 seconds back to a normal tick-over.
The scoot seems to run a treat apart from this. I've noticed this phenomena on several scooters I've owned over the years but never really found out what it is. There doesn't seem to be an air leak and the throttle isn't sticking. The plug is a nice healthy dark brown.
Any bright ideas?
Revs go up when I shut the throttle!
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ArmandTanzarian
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Meus Lambretta est non infractus. Is est quietus.
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jason frost
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The slide is to weak, try one with a smaller cut away.
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ArmandTanzarian
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28mm delorto on a mugello. Although I've had it happen on all sorts of scoots from a Monza with a TMX35 to a completely standard series 2 with its original carbsoosh wrote:What carb is it?
Meus Lambretta est non infractus. Is est quietus.
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carlosfandangles
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what does that mean? I had the same trouble just before I took it to bits for refurb. Sorry for sounding thick.jason frost wrote:The slide is to weak, try one with a smaller cut away.
.... i have same symptom, after dual carriageway / motorway, casa 185 and pwk 24mm, thouht it was air leak too, but can't find one............
Weak on slide atomizer or needle...
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ArmandTanzarian
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that was my thinking but the plug is very dark brown and at low revs it's clearly too rich as it stutters and pops like a machine gun.J1MS wrote:Weak on slide atomizer or needle...
Maybe a bigger main but lower the needle. That might richen the top but lean off the bottom.
Meus Lambretta est non infractus. Is est quietus.
I would try the slide first as "Jason has suggested", but only make one change at a time. float height and weights also make big chances to carb settings. But the slide cutaway would be the first thing if it were mine...
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Stampede
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Your carb setup works? The pilot jet is the right size and it only happens after fast riding?
We've got often the same symptom here, one theory is that through the spitback on fastriding with open throttle, there's a lot of air/fuel mixture left under the panel, which keeps the revs high after closing the throttle till it's gone.
We've got often the same symptom here, one theory is that through the spitback on fastriding with open throttle, there's a lot of air/fuel mixture left under the panel, which keeps the revs high after closing the throttle till it's gone.