If the gap is incorrect the points must be re-adjusted. Bench timing the magneto, or setting the E-gap. Familiarity with spark plugs and their wiring will be helpful. 175 points.png Breaker cam.png Dwell angle vs gap.png As the breaker cam on the advance unit rotates with the camshaft, the cam follower (first pic) of the points "falls" into the reduced radius area of the breaker cam (next drawing), allowing the spring to close the point contacts (sending electrical power to the coil).....As the breaker … (S) If the points are pitted, they should be cleaned and dressed ai previously described, ensuring that when fitted together they bear with a maximum contact. A dwell angle of, let's say 60 degrees means that the breaker point should be closed 60/90 part of the time to build up enough power for a strong spark. Inigtion timing should occur at 0.09 inch, (2.2 mm) BTDC. Then check that the contact-breaker assembly is not wobbly on the end of the shaft. For accurate setting there is a gauge fitted on the contact breaker spanner supplied by the Villiers Engineering Company, at the price of 3d. NOTE: Settings are made with the contact breaker cam set in the fully advanced position unless otherwise stated. Now we come to the tripping operation. Infact if the coil has only SW and CB markings on the terminals then the contact breaker wire should go to the CB terminal even if the Land Rover has positive earthing. The correct gap setting depends on which model Tecumseh engine you have. Just fitted the new contact breaker points (part 183-81421-10). The contact breaker (aka points, or set of points) is a type of electro-mechanical switch used to trigger an ignition pulse (spark) in spark-ignition internal combustion engines.The points may be located behind the flywheel, within a distributor or inside of a separate contact breaker housing, depending on the design of the engine.For our purposes, on mopeds, the points … NOTE: The key should be in the OFF position. Consult your engine manual or references accompanying this article to find the appropriate gap spacing for your model. At this point you will have the widest gap between the points. Inigtion breaker point gap should be 0.014-0.016, (3.5-4.0 mm). are clean and properly adjusted. The point gap clearance should be between; 0.3 mm - 0.4 mm . (.35 to .40 mm.). When the heel of the contact breaker is exactly on one of the lobes of the cam and the points are therefore fully opened, measure the gap between the points with a feeler gauge. The condenser has a very important function here. Here is an exploded diagram of a Harley Davidson breaker points assembly. Breaker contacts separate .017 inch. 0.012 inches - 0.016 inches . or . With the contact breaker point gap is at its maximum opening size, check the gap with a wire gauge or feeler gauge. As you can see in the pic below the teeth of the contact breaker plate are nice in the center of the screwdriver "lobes". Let’s at time T 5 current starts flowing through trip coil of the circuit breaker.At time T 6 moving contact starts traveling backward for opening the contacts. C-12. Now turn the engine over while watching the cam. The contact-breaker setting is often neglected, but it is vital to good running. occasionally be checked to see that the points. The gap should. (2) Set the breaker point gap to approximately 0.5 mm (0.02 in). at .018 inch to .022 inch. each. After time T 7, the moving contact finally detaches the fixed contact.Time (T 7 – T 6) is over lapping period.. Now at time T 8 the moving contact … The ignition points dwell angle for that engine should be set at 29-31 degrees dwell (a dwell meter would be the most accurate way to set the ignition points), or a .019 in. Dl, for … The current flowing in the primary circuit would tend to arc across the breaker gap as it opens, and dissipate all the energy in the … When installing the points, secure them down to the points plate and set the gap at .016" on one of the lobes. Crank engine to fully open breaker points (1/4 turn after top center). To adjust the contact points proceed as. Do not. Tighten the mounting screw when correct gap is attained. The screwed point should be carefully held in this position while the lock nut is then tightened securely. The gap should be .015 in. point gap. If the cam follower on the breaker arm is worn, you might have the correct dwell angle, but the point gap will be too small. I was trying to set the gap, but couldn't seem to get any gap at all and then I noticed that the base plate that the points sit on is tilted at an angle. A 0.38 mm (0.015ins) feeler should just be a sliding fit. Methods for checking E-gap is to align timing mark with a pointed chamfered tooth. Contact Breaker Gap must be: 0.020 in (0.05mm) Dwell Angle 35 to 37 DEG (up to engine No:1639762) HOPE THIS WILL HELP. Rotate the engine until the points are fully open and then check the gap with feeler gauges. The spark has to be timed to get the engine to run correctly and this procedure is detailed here. The distance between the firing tips of the breaker points at the open position is known as the gap. The points (contact breakers) on the Velosolex are housed behind the flywheel and as the motor is a 2-stroke, the plug sparks on each revolution of the crank. While holding it in that position, tighten the centre screw, but do not use undue force. Do not alter the setting unless the gap varies considerably … Next you should set the gap with a feeler gauge to get it running. Check the contact breaker gap regularly when the machine is in frequent use to maintain the correct gap. Codes; Vacuum Breakers: Understanding how they protect our water. contact breaker gap is maintained. Check the gap between the points inside the ignition housing with a feeler gauge. The contact point gap should be set to the thickness of this gauge. The bigger the contact breaker gap the lower the dwell angle!! for Lucas equipment. Loosen locking screws (A) and turn cam (B) tQ adjust. Check the specs for your system to find out what the gap should be. The contact breaker is only touching the cam at the very bottom and not enough to open the gap. If I push down on the opposite side, the base plate levels and lo and behold the gap … A contact breaker is an electrical device generally used in the ignition system of an internal combustion engine. It should fit properly in only one precise position. Breaker Lever Spring Tension One of the most important items to check is the breaker lever … Jerry If the gap is obviously larger or smaller than this it should … Ideally, check and set the gap, between every major service, and replace the contact breaker after 6,000 miles or 10,000 km, or twice a year. ... A small gap between the contact points of the breaker allows an electrical arc to occur when it is in the closed position. A common reason for the points gap to gradually decrease is because the (usually red) heel of the breaker mechanism is worn down by the central rotating … every 6,000 miles (9600 km.) The correct contact breaker gap in all cases should be .012” and the spark plug gap .018”. This mark should be aligned with the center of the points heel when checking the gap. Inigtion timing is not adjustable except by adjustment of breaker point gap. Breaker arm spring tension is … Set contact gap by loosening lock nut on stationary contact mounting stud and turning the stud until correct gap is obtained with breaker arm on lobe of cam, Resurface contacts when necessary with a fine flat contact file or on a medium hard oilstone. use a file. and the timing should be set at 10 degrees before top dead center. On my G2 the back plate which the contact breaker screws to (043118), seems to be worn and when I try to set the gap or timing its difficult to get it right because when you loosen the screws on the back plate it … If the gap is correct the gauge should be a sliding fit. frequency withstand test set. On some of the Japanese four-cylinder bikes (Suzuki, for example), the contact points operating cam has a line or indentation at its highest point (maximum lift). Photo 1. 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