All the fastners shown within the 2nd pic are included as well. Needle valve sizes available are 150,170,200,225 &250. Consists of all the gaskets,o-rings,needle valve and diaphragm (as shown in the pic). Dellorto DRLA 36/40/45/48 carburettor rebuild kit.
![]() ![]() In the first idle system, where is subsisting the replacing jet and the air adjusting screw, you must operate on this air screw in order to obtain a correct carburation, bearing in mind that by tightening it the mixture strength is enriching, while by unscrewing it the mixture strength is weakening. 1)It is necessary first of all to bear in mind that this adjustment must be established always when the engine has reached its normal running temperature. 2.Banjos for fuel take, single and twin, with the end suitable for direct assembly of rubber pipe and 1/4 gas threaded.(Throttle valve opening corresponding to the section A – Fig. From their lip when installing they must be fixed so that their level is at the same height of air valve channel center line, as shown on fig. In this case the main jet must be replaced by others of the next sizes up until the one, which gives the correct result, is found.If the throttle valve is fully turned on, and the engine gives a muffled sound from the exhaust or is missing explosions with emission of black smoke, and by closing the air valve the defect increases, this indicates too rich a mixture. 1.It is therefore in this field that it is necessary to operate in order to establish if the main jet fitted is the most suitable one, and precisely:If fully opening the gas, the engine begins to turn over with difficulty and instead of increasing in speed,it does not change or even loses and tends to backfire, and if by closing the mixture control piston, a distinct improvement in running is noted, this indicates that the mixture is too weak. 1).The influence of the main jet is especially felt in the throttle valve opening corresponding to section D – Fig. Melody download for pcIdle with rechangeable jet and air adjusting screwFor fuels with alcohol up to 50% it will be enough to tighten the air screw, in comparison to the adjustment used for super fuels, just to its complete tightening.For fuels with alcohol over the above percentage it will be necessary also to replace the pilot idle jet by a larger one from 5 to 15 points and adjust comparatively the air screw.With the idle system it is enough to open the screw at pleasure just when a correct idle running is obtained and in the first throttle valve openings.Of course all these instructions are not rigorously fixed but partly entrusted to the judgment and to the sensibility of the experimenter who only by meticolous tests and exactly knowing the features of his engine and of the fuel used, will have the possibility to realize a perfect carburetor adjustment.As approximate adjustment data please see at the adjustment key for alcohol. The average position advised by us for alcohol fuels is at the 4th groove (or hole).A main jet oversized from 25 to 50 points about must be fitted according to the carburetor diameter and to the alcohol percentage of the new fuel.Also for the running in the idle area it will be necessary increase the mixture strength, operating as follows.
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