Dell Orto PHM40 carburettor set

Dell Orto PHM40 carburettor set

Dell Orto PHM40 carburettor set

The famous and legendary "pumper" Dell'Orto carburettors fitted to numerous Italian high performance motorcycles such as Ducati, Moto Guzzi etc. Outstanding performance due to its accelerator pump design (injecting additional 4cc of fuel every time you WOT - wide open throttle) giving instant acceleration through the gears.

Brand new, pair of original Dell Orto of accelerator (pumper) carburettors, carefully built on new 2021 factory tooling.

These are built with the standard M52 threaded intakes (52 x 1.25mm) that can accept either the original black plastic BMW inlet tracts or the specific Dell Orto bellmouth trumpets (please see our other listings).

These PHM pumper carbs have slide/clamp on type connection to the cylinder head stub (45 to 48mm scope), exactly as per the original specification for the BMW R90S engines. 

For those converting other BMW models to use these carburettors, please see our PHM38 and PHM40 conversion kits, which includes all the required parts including stainless steel cylinder head stubs. These offer fantastic value money when compared with the superlative performance offered and the high cost of refurbishing/replacing the original Bing CV carbs.

Standard Ducati 900SS jetting and set up, as follows:

  • 601 Slide
  • K4 Needle
  • 265 AB atomiser
  • 152 Main Jet
  • 60 Idle Jet
  • 50 Pump Jet
  • 300 Float valve
  • 7450.1 Floats - 8.5 grams

IMPORTANT: Unlike the PHM38 carburettors (cable or lever operated chokes), these PHM40 are equipped with cold start fuel float ticklers.

This standard jetting has also be proven to be quite adequate for modified R90S and R100 (980cc) engines, especially those with sports camshafts (320, 336 etc), larger valves, ported heads, enlarged capacity with forged and lighter pistons, lightened cranks and flywheels, etc. However, it is always advisable to fine tune the carburetion and ignition on a rolling road dyno, by a competent operator.

Standard PHM38s (38mm) as fitted to the R90S and suitable for standard tune 980cc R100 engines are also available. Please check our other listings.

A vast range of spares for these Dell Orto carburettors are available including jets, needles, slides, air trumpets (bell mouths), tuning manual, etc. Please contact us with your requirements.

As previously mentioned, we can supply Dell Orto PHM38 and PHM40 conversion kits for those wishing to replace the original BMW Bing CV carburettors and convert other BMW Airhead Boxer models to use these carburettors. Please see our other listings.

A superb upgrade, offering a noticeable improvement of throttle response and overall performance. Ideally suited for modified and tuned 900 and 1000cc engines, including those using our Performance and 1000cc conversion kits. 

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