Dellorto Motorcycle Carburetor Tuning Guide and INSTALLATION

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Filed Under (Tips and Review) by admin on 04-02-2012

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Installation angles The tapered-needle-type Carburetor s with concentric, central float chambers have a horizontal main barrel and can be mounted up to a maximum inclination of 40 degrees from the horizontal (figure 3) . For
applications on motocross and trials engines, etc, this inclination should be 30 degrees or less. fig. 3 2.4 Engine connections The Carburetor is usually connected to the engine with one of the following : Male clamp fixing : the male clamp connection used for the flexible fixing of the Carburetor to the engine is usually recommended on motorcycles for motocross, trials, etc or fitted to engines which run to high rpm or those which produce strong vibrations. fig. 4 Female clamp : the female clip connection and the flange connection, with a rigid fitting to the engine, are usable on road motorcycles or fitted to engines which do not generate very strong vibrations

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Dellorto Motorcycle Carburetor Tuning Guide INSTALLATION

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Filed Under (Tips and Review) by admin on 01-02-2012

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The main Carburetor functions are: • To form a proper homogeneous inflammable mixture of fuel and air • To supply the engine with varying amounts of this mixture The fuel-air mixture is formed through vapourising and by uniformly spraying fuel into the airstream or at least by atomising it into very small droplets. Atomization takes place in this way: liquid fuel from the atomiser nozzle meets the flow of air which carries it, broken into very fine droplets, to the combustion chamber. We have spoken of a “proper” mixture because the mixture strength, defined as the amount of air in weight mixed with a fuel unit of weight, must have a precise value, ie it must be within the limits of inflammability so that the mixture can be easily ignited by the spark in the combustion chamber. lnflammmability limits for commercial petrol are: 7: 1 (rich limit ie. 7 kgs of air and 1 kg of petrol) , down to 20: 1 (lean limit ie. 20 kgs of air and 1 kg of petrol) . To obtain optimum combustion between these inflammability limits, a value very close to the so- called stoiciometric value is needed ie. about 14.5 – 15.0 kgs of air to 1 kg of petrol. A stoiciometric mixture ratio is one which ensures complete combustion of fuel with only the formation of water and carbon dioxide. The stoiciometric mixture ratio depends on the kind of fuel used, so if the fuel is changed, this fuel- air ratio will also change (see SECTION 5.1 ) .

Motorcycle Carburetor Rebuilding

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Filed Under (Tips and Review) by admin on 22-11-2010

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Experience has shown that when a customer disassembles, it creates a storage issue for us as well as parts are generally missing. The disassembly usually costs us extra hours of work during the rebuild. The only acceptable part to be removed from an assembly is the cable bracket if it is fragile and in danger of breaking during shipping. All other parts should be where they belong. Rebuild Service Prices: If your carburetor type doesn’t appear below or you are not sure, please send a note to our e-mail for pricing details. Military rebates are available to honor our service men and women! Active Duty military, contact us for a rebate. Please include your service, pay grade and current duty station when you contact us.

CARBURETOR: BASIC PRINCIPLES

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Filed Under (Tips and Review) by admin on 16-11-2010

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On the right, the main components of a Dell’Orto motorcycle carburetor are shown: 1. starting lever; 2. air intake; 3. venturi; 4. starter jet; 5. float chamber; 6. atomizer; 7. fuel valve; 8. needle; 9. throttle valve; 10. float chamber air intake; II. fuel connection; 12. Idle mixture adjusting screw; 13. throttle valve adjusting screw; 14. float; 15. idle emulsion tube, 16.idle jet; 17. main jet. This is a diagram of the gasoline delivery in the inducted airflow: the fuel inside the float chamber rises in the atomizer (31), going through the jet (32) which adjusts the delivery together with the needle (28); the liquid is emulsified first with the air arriving from the channel (13) inside the nozzle (30) then going into the venturi (29) it mixes with the air coming from the intake

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