Before starting and running in the engine, it is necessary to install correctly and with great care the following accessories.
Carefully insert the supplied plug in the cavity of the engine head, making sure the threads match before tightening it firmly.
(The plug is supplied already mounted on the engine, but we recommend this procedure every time you have to remove it. Conical plugs do not have gaskets).
Mount the silicone gasket on the special grooves on the exhaust. Do not use metal tools that could cut the gasket, use only your fingers.
Spread a light veil of oil on the gasket then insert the manifold, turning it gently into its position with the 4-hole flange. Insert the 4 springs provided in their special housings.
Mount the silicone gasket on the special grooves on the exhaust pipe. Do not use metal tools that could cut the basket, use only your fingers.
Spread a light veil of oil on the basket, then insert the exhaust pipe in the manifold, turning it gently. Mount the 3 springs provided in their appropriate housings.
The exhaust pipe must then be fastened to the chassis using a flexible metal wire that will absorb vibrations and prevent damage to the exhaust pipe.
The engine is supplied with its carburetor installed but not firmly fastened in the standard position. Loosen the fastening screws and place the carburetor in the ideal position for your model car.
Press the carburetor towards the engine while tightening the fastening screws.
Tighten the screw as firmly as possible without fear of ruining the carburetor body.
Now mount the air filter described previously.
Mount the flywheel and clutch block as usual, as for all other similar types of engines.
Make sure that the surfaces of the mounted engines are all on the same level and on the same plane. Incorrect installation can cause, at high temperatures, distortion of the casing, bearings, etc., resulting in a considerable loss of performance.
We recommend use of the correct screws, according to the type of model, and to check that the fastening holes are perfectly centred.
Check also that the engine casing does not touch the base of the model's chassis.
Now you have completed the engine with all its parts and mounted it on your model, continue as follows.
To guarantee long life and top performance, each engine needs to be run in, bearing in mind that the more careful the running in, and more the engine will give its best performance over a longer period.
Running in must be done carefully with the engine installed on the model, in the following way:
N.B.: whenever any important parts of the engine have to be replaced, such as the piston, cylinder, shaft, bearings, etc., or if you change the fuel, the complete running in procedure must be repeated.
WARNING!
Never touch rotating parts, the engine or the exhaust pipe after switching off the engine because they are very hot and contact could cause severe burns.
Final tuning of the carburation must be done only after completing the running in, and according to the following procedure:
N.B.: the carburetor needles must be adjusted gradually and not more than 30°, always checking accurately the effect of any tiny adjustment on the accelerator.
Make the adjustment patiently, under contest conditions, until the engine responds rapidly and promptly to accelerator controls.
WARNING!
Adjustments of the carburetor by means of the minimum and maximum needles cannot be made accurately when the wheels of the model are raised from the ground since this does not reproduce the real conditions of use, and an operation of this kind could damage the engine by overheating.
When you reach the optimum carburation, a slight trail of smoke will be visible during high-speed runs and the engine rotation regime increases smoothly during acceleration. Remember that, if carburation is too lean, the engine will overheat and will not give maximum performance.
As for all engines, we recommend setting a slightly oilier carburation than the optimal point, as a safety measure.
If the engine, with the carburetor completely closed, remains at a too high minimum regime, loosen the minimum screw in anti-clockwise direction to reduce the opening of the carburetor throttle.
Never ever exaggerate the number of revolutions because the engine can reach even 48,000 rpm, which would cause serious damage to the crankshaft and conrod.
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