dellorto vhst 28 carb

[jasepugh1984]

my bike sits at 4.000rpm for about 5 seconds after i rev it high when its warmed up.Im trying to find a good diagram of the DELLORTO VHST 28 carb thats on my 2007 aprilia rs125,I wanted to try and see if theres a way to let slightly more fuel in because ive been told that it might be fuel starvation thats causing the problem.i dont have much experience with motorcycles but keen to learn,thanks.
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Aprilia Rs125 2007 11kw (SOLD) - Honda CBR600RR 2008 (Current Summer Toy) - Honda Cb600 2000 (Current Work Commuter)

[oldbiker]

This might be of some help, dellortos tend to be very much the same, with only minor differances from one version to another

https://www.ducatimeccanica.com/dellorto_guide/dellorto.html
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[B10Hazard]

If you want to increase the amount of fuel going through the system you have to buy a bigger jet. There not expensive and pretty simples to put in.
https://www.pjme.co.uk/acatalog/RS125-34mm-CARB-JET-PHOTO.jpg

Thatvshould help.
You should go to about 165 or 170



Dan
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Current bike .. The police stole it
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[hmmmnz]

sounds more likely that you have an air leak,
with the bike idling spray wd40 at the carb and rubbers both sides of it, if the revs change then you have a air leak if not you can rule that out,

you havn't changed to a stupid pod filter have you??
if so put the air box back on
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[jasepugh1984]

yeah i will try that and see what happens,no i havnt touched the airfilter at all.it seems to do it when ive taken it for a ride and its well warmed up.
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Aprilia Rs125 2007 11kw (SOLD) - Honda CBR600RR 2008 (Current Summer Toy) - Honda Cb600 2000 (Current Work Commuter)

[chillpill]

how do you warm it up ? if you just let it sit at idle for a while you might of fouled the plug ? idling at low engine temperatures creates a excess build up of 2 stroke oil around the plugs electrode causing a weaker spark , try a new plug they cost about 4 quid from your local bike shop

[jasepugh1984]

yeah i did put a new ngk spark plug in it last weekend but it still does it,the old one didnt look fouled.
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Aprilia Rs125 2007 11kw (SOLD) - Honda CBR600RR 2008 (Current Summer Toy) - Honda Cb600 2000 (Current Work Commuter)

[oldbiker]