Just thought id do a post on the fuelling side of RS125 .
It a pretty simple system using the Carburettor , Reeds .
Fuel System consists of
-Fuel Tank
-Fuel Tank Tap - inc built in Fuel filter
-hoses which sometimes have a fuel filter added
-Carburettor which meters the fuel via specifically sized jets
-Inlet manifold
- Reed valves
Buy all the New an USED Aprilia RS 125 parts on Ebay UK here
Carbs fitted to the Aprilia RS 125 in the Past are the
Dellorto 34mm LD early model unrestricted models pre emissions regulations
Slide 40
Needle K57
Slide Needle Valve 266DP Atomiser
Main Jet 160
Pilot Jet 40
Choke Jet 60
Float Valve 300
Float 12630.1 - 9 grams
The Dellorto PHBH 28BD Aprilia RS 125 (1996-2012)
Slide 50
Needle X2
Slide Needle Valve 264BN Atomiser
Main Jet 115
Pilot Jet 65
Choke Jet 70
Float Valve 250
Float 9010.1 - 9.5 grams
Servicing the fuel system - check over .
-Clean out the air filter as well , and reoil prior to fitting ( not strictly fuel but important )- Check inside the tank for any debris , water etc
- make sure any breather holes for the tank are clear and able to breath in air ( this could restrict fuel flow )
- Check and clean the internal tank tap filter
- After refitting check for leaks and refit hoses making sure
all hoses are tightly fitted and no leaks and no splits or damage to pipes .
- make sure fuel pipe is of adequate diameter and construction so as not to obstruct fuel flow .
- fit and inline fuel filter if needed .
- There is also a small filter on the carb , behind the inlet connection clean this as well .
- if the bike is running badly or will not start very well , then clean the carb out thoroughly
we do a post HERE if you want to read that on cleaning the carb and jets .
- Make sure all jets are correct sizes and set you float height correctly and clean the float
valve and hole out as well while you there .
- Check the inlet manifold for cranks and correct fitment , any leakage here will affect the
running of the bike and possibly cause a non start issue .
- check the reed valves hold the reeds up to a light source and you should not see much if
any light source through them if you can its a sign of wear and will affect the running .
- Check compression you might not be pulling enough air into engine due to worn rings or other problems , not enough air me and not enough fuel .
Here is a photo of the internal fuel filter and it clearly shows the fuel filter on the end of the internal tank fuel pipe , its worth stripping the tank tap down and cleaning out internally if problems persist .
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| Aprilia RS125 fuel taps The carb inlet filter is fitted behind the inlet connection pipe pull it out and clean it as this could cause a restriction in the fuel line |
Aprilia RS 125 Reed valves
Buy New an USED Aprilia RS 125 parts here
see more Aprilia RS 125 posts here
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