Two-Stroke Engine Repair and Maintenance

By Paul Dempsey

Get height functionality from Two-Stroke Engines

Do you spend extra time attempting to begin your weed trimmer than you do having fun with your yard? With this how-to advisor, you could win the conflict with the temperamental two-stroke engine.

Written by way of long-time mechanic and bestselling writer Paul Dempsey, Two-Stroke Engine fix & Maintenance exhibits you the way to mend the engines that strength backyard gear, building instruments, moveable pumps, mopeds, turbines, trolling cars, and extra. unique drawings, schematics, and pictures in addition to step by step directions make it effortless to get the task performed quick. keep time and cash in the event you find out how to:

  • Troubleshoot the engine to figure out the resource of the problem
  • Repair magnetos and solid-state systems--both analog and electronic ignition modules
  • Adjust and service float-type, diaphragm, and variable venturi carburetors
  • Fabricate a crankcase strain tester
  • Fix rewind starters of all types
  • Overhaul engines--replace crankshaft seals, major bearings, pistons, and rings
  • Work with centrifugal clutches, V-belts, chains, and torque converters

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One needed to bush the take hold of all the way down to the dimensions and play with spring rigidity to compare two-stroke torque features. yet that has replaced: Comet Industries now bargains a 3/8-in. -bore centrifugal take hold of two-stroke engines of among zero. five and a pair of. five hp. Fig. 7-1. Two-shoe grab general of backyard instruments. Robert Shelby Fig. 7-2. whilst the take hold of drum rides on a bushing, common lubrication is needed. Robert Shelby Fig. 7-3. The seize for a Dolmar chainsaw is extra refined than these pictured formerly. significant parts are the drum (99) and shoe and spring meeting (127). upkeep maintenance will not be tricky, when we become aware of that almost all of those clutches safe with left-hand threads. additionally, bear in mind that beginning an engine with no the take hold of drum in position invitations critical damage. The sneakers, not limited by means of the drum, turn into projectiles. or even with the drums in position, clutches were recognized to blow up. Racing go-karts have their clutches encased in heavy-gauge metal guards. desk 7-1 snatch Malfunctions and Their possible motives keep on with this technique: 1. eliminate the engine from the body. On a few designs, the grab drum is still with body because the engine is indifferent. 2. If the hold-down nut needs to be got rid of for entry, be sure the thread path. a few left-hand-threaded devices are marked; others may be pointed out via shut inspection. eliminate the nut with an influence impression wrench. whilst hand instruments are used, lock the crankshaft with a size of nylon rope fed in the course of the spark-plug port, as illustrated again in Fig. 3-2. three. make certain that the pushed point might be grew to become by means of hand. If now not, ascertain the reason. four. conscientiously study the take hold of drum for cracks, warmth assessments, and ratings. change as helpful. five. The footwear should be constrained by way of an encircling garter spring or, if pivoted, by means of person springs (33 in Fig. 7-4). Pry the springs off with a screwdriver (Fig. 7-5). don't be stunned to discover that the springs have misplaced rigidity due to overheating. 6. Friction surfaces has to be dry, if the grab isn't to slide. A leaking pto crankshaft seal will oil the grasp. 7. investigate cross-check sneakers for put on. Heavy-duty sneakers might be coated with Kelvar or one other non-asbestos friction fabric. eight. get rid of the fastening and flippantly grease the shoe pivots. V-belts A V-belt transmits strength through wedging its angled facets into the pulley grooves. because the belt wears, it sinks deeper into the pulley, or sheave. finally the belt rides at the base of the groove, defeating the wedging motion. little or no torque is transferred. Sheaves “dish” in carrier, a that may be detected with a straightedge. Any gentle among the straightedge and the flanks of the groove is grounds for changing the sheave. severe put on sends the belt into base of the groove. Adjustment be sure that pulley shafts are lifeless parallel and align pulleys with a straightedge in order that the belt facilities within the grooves. Belt rigidity is hard to generalize approximately because the right pressure depends upon a number of elements, reminiscent of the arc of touch at the smaller pulley, belt width, and distance among pulley facilities.

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