Bully Style Single Disc Clutch 12 Tooth Drive Gear UPDATED

Bully Style Single Disc Clutch 12 Tooth Drive Gear

Note:Nosotros have found he length of pto crankshafts vary by manufacturer, model and from motor to motor inside models. This is an surface area to pay close attention to, every bit the length of the crankshaft affects the internal side clearance of the clutch. If needed shim washers and spacers are included. These parts can be used to accommodate your side clearance in the range of .010� to .025�. The exploded view of the clutch shows where to position the spacers. In some circumstances it may be necessary to trim the length of the key. In all circumstances the cutaway expanse of the key must fit under the sprocket begetting.

Model Applications - The 1� Turbo clutch is designed expressly for use on high torque iv stroke racing engines that apply a i� PTO shaft. Spring and weight combinations may be interchanged to adapt the private awarding. As you make your selections be enlightened that the heavier the weights and the stiffer the leap, the more positive the appointment becomes. Stiffer springs are springs with a larger wire diameter and they volition requite higher stall speeds.

Stall speed.

Stall speed is the reading shown on the tach as the kart is accelerating from a boring speed before the clutch has get a locked couple.

As the springs are adapted clockwise, the tension on the springs is increased and the stall speed is raised. The inverse is true of turning the springs counter clockwise, as this volition lower the stall speed.

Nosotros have found from all-encompassing testing with a computerized accelerometer that the greatest rate of acceleration volition occur when the clutch engages at the torque acme of the motor. Still, it also should be pointed out that the addition of the clutch to an engine may alter at what RPM your engine produces its torque peak. (Usually information technology moves upwardly 100 to 200 RPM) Also, a given clutch ready will exist most efficient with a given amount of torque and engagement RPM. Effigy 3 provides some information for anyone looking to deviate from the above settings.

When setting stall speed we propose making your adjustments in 1/4 turn increments at a time. When testing for your stall speed, utilize extreme circumspection as to not over heat the clutch. Side by side to contamination of the friction disks, heat is the clutch�s biggest enemy so be sure to let the clutch absurd down completely between stall speed tests.

Installation.

When installing the Corking clutch, the drive sprocket should exist installed facing toward the engine. Even though the clutch volition accept equal performance installed in either direction, the life of the aluminum clutch basket will be much shorter if the clutch is installed with the sprocket outward. Additionally, the clutch aligning springs volition exist more accessible when the clutch is installed correctly.

When installing your clutch make sure there is a minimum of .015� and maximum of .030� end play. Afterward tightening your clutch to the engine, end play can be checked with a feeler gauge between the finish of the drive hub and the crankshaft stride. See Figure 1. Reducing end play is washed past using the .035� shims included, part # 151-002. If the crankshaft is short it will need to have the end play increased by shimming out the 098-015 aluminum washer confronting the end of the crankshaft. This can be washed by placing a washer against the end of the crankshaft that allows the drive hub to slide over information technology. Non having enough end play my cause permanent damage to your clutch.

Clutch disc break in.

The clutch discs require a period of suspension-in in order to attain maximum clutch functioning. During this time the outer surface of the linings becomes hot and the microscopic pores of the lining cloth volition brighten themselves to a stable status. The friction textile used in the manufacture of the Slap-up clutch discs will crusade the discs to have more bite equally the clutch gets hot. The bite from the disc volition also continue to increase throughout the life of the disc.

The suspension in process should be done when the clutch is new and as well after each time the clutch is disassembled or rebuilt. This can be washed with the kart on the stand up. The break in process of the clutch is similar to the pause in of your motor subsequently it has been rebuilt. The goal of the process is to gradually build temp in the clutch at short intervals with cooling betwixt the intervals. If you have a tire temp gun it works great for this process. Engage the clutch and bring the temp upwards to well-nigh 250 degrees and so let it to absurd downwards, appoint the clutch over again and bring the temp upward to nigh 300 degrees and again permit it to cool down. Continue this process until you bring the clutch upward to approximately 400 degrees. This unabridged process should accept about 4 to v minutes.

Air gap.

The air gap is the clearance betwixt the friction disks. It is measured with a mutual feeler gauge and is stated in thousandths of an inch. When new, the Turbo Peachy clutch is preset between .030� and .035�. During burglary information technology is expected to run across the air gap grow approximately .010�. For most applications the clutch will perform at its peak with an air gap between .040� and .055�. When this dimension is greater than .065� the floater disc should be inverse to a thicker unit to restore the air gap back to the original dimension. See Effigy 2.

Bound height.

As mentioned before, spring top will effect the engagement RPM of the clutch. We suggest making equal adjustments to all half-dozen springs of one/four turn increments at a time. The bound diameter, preload, weight package, engines power and several other variables all will consequence how much of an RPM change is found with a one/4 plow change just an average change will be approximately 100 RPM. Turn the jump adjustment clockwise for more slip and counter clockwise for less slip. The range of adjustment should exist between .140� and .330�. This is the distance between the lesser of the spring retaining washer and the peak of the activator plate.

See Figure three.

Theory of functioning and dialing in the Bully clutch.

For theory sake lets suppose that the outer clutch basket is constrained and not immune to rotate such as would occur if the restriction was held on tight. When the throttle is opened, the engine will come up to a certain RPM, the clutch volition engage and a signal of equilibrium volition exist found......At this point of equilibrium, or stall speed, the unabridged amount of torque being produced by the engine is being transferred into the clutch. What RPM this occurs at is controlled past 4 variables. Namely the weight of the levers, practical tension of the springs, the coefficient of friction between the friction disks and the corporeality of torque the engine is producing. A change of each of these variables has it�s own unique effect on the appointment quality of the clutch. As a guideline, lighter levers and less spring tension performs all-time on motors with lower pinnacle torque values and on tracks where the clutch is continually cycled through its slip range. Heavy levers and high spring tensions will perform best on motors with loftier torque values and on tracks that require a good launch on the start. If levers are too light for the torque available, the clutches point of equilibrium will be inconsistent and the transfer of power will be inefficient. If the clutch has too much weight on the levers, or the coefficient of friction of the discs is too bang-up for the torque of the engine, a chatter volition be produced by the clutch. Churr is an attempt by the clutch to create a complete lock-up. If the engine does non have enough torque to maintain its RPM, the clutch slows.. releases..the engine speeds back up.. and the resultant churr is from this process repeating itself very rapidly. Churr, if left unchecked volition destroy a clutch in just a matter of minutes.

Leap colour and summit recommendations.

Our recommended starting points for spring height and lever/weight combinations on a motor with average torque.

What the spring color and elevation nautical chart cannot let for is the coefficient of friction available from the friction discs. The amount of friction produced by the discs may vary. The biggest culprit to friction reduction is from contamination of the discs themselves. The most common forms of contamination are chain oil, wet and dirt. In most instances the clutch discs will run hot enough to fire off most of these contaminates, however, if the discs become contaminated the clutch may lose its positive experience while also losing some of its ability to transfer power. In the real world, friction discs will non always exist able to piece of work in an uncontaminated surroundings. To cure a soft engagement and restore the clutches ability to transfer ability you may want to add together weight to the levers. Follow this by readjusting your springs IN, clockwise, until your ideal appointment point is once over again plant.

The other side of the above status is too much disc friction. This tin occur from a very rapid break-in, very low humidity conditions, rust, or when sure cleaners have contaminated the friction discs. This condition will effect in a clutch chatter and if left unchecked may cause mechanical damage to the clutch. To cure a chatter, first remove weight from the levers (if present). If all of the weight is removed from the levers and a chatter is still present, check all springs to insure equal jump height settings.

MAINTENANCE.

The clutch should be protected from moisture and clay as much as possible. It is important that a small amount of lubrication is provided to the chain. However, too much lubrication can cause the lubricant to migrate to the friction disks and render them useless. Then, oil the chain sparingly. The clutch should exist cleaned afterward each race nighttime. To make clean your clutch we recommend taking the sprocket/ basket assembly off the clutch. Take the 2 pieces and soak them in a bath of acetone for virtually 10 minutes. After soaking, spray the clutch out with air, re-lube the sprocket begetting with a small amount of Vaseline and reinstall on the motor. Periodically the air gap and disc thickness should be checked but we exercise not recommend disassembling the clutch except to change the air gap or rebuild the clutch.

The thrust bearing located in between the sprocket and the clutch hub should be run dry. Of course its life would exist extended by lubricating it, only the lubrication from this begetting is nearly likely to contaminate the friction discs. Since the toll of replacing the thrust bearing is very low compared to the price of friction discs, nosotros recommend that this bearing exist run dry out. The friction disks should be replaced when their thickness becomes less than .110� or when the square outer drive prongs become deformed. A chatter condition in the clutch will cause near immediate damage to the friction disk drive prongs and the basket.

The pressure plate and the clutch hub should periodically exist checked for warpage and straightness. If in dubiousness, they should exist re-footing or replaced.

Levers require visual inspection each time the clutch is disassembled. Look for flat spots developing on the nose of the lever. By the nose, nosotros are referring to where the lever contacts the pressure plate. If whatever noticeable clothing is seen, the lever should exist replaced. Also make sure that the lever is able to rotate freely on the dowel pivot.

Important sprocket information.

Bully Sprockets are manufactured using the highest grade of materials, CNC machining and heat treat processing. In an try to give your sprocket the all-time life expectancy and performance, we offer the following tips.

The sprocket has a removable needle bearing peculiarly designed for applications with minimal lubrication. A small amount of lubricant should be applied to the bearing prior to installation but if you tin run across the lube on the needle rollers, yous have probably used likewise much. Since oil and other contaminants can drift to the friction discs, reducing their life expectancy and engagement quality, we recommend using petroleum jelly to lubricate the bearing. It will vaporise at relatively low temperatures but volition provide plenty lubrication for acceptable bearing life.

When installing the sprocket in the basket, be certain to use the Large snap ring, function # 098-028. To foreclose the snap band from rotating the spiral (ZN-93724) MUST Exist INSTALLED Between THE SNAP Ring ENDS. The included outer washer (098-013) is to be installed between the sprocket and the drive hub snap ring. Side clearance should be between .010� and .030� when mensurate with a feeler gauge. See Effigy 4.

Do non use any aftermarket sprockets with a bronze bushing. Use of whatever aftermarket sprocket may effect performance and fit of the Bully clutch. Caution: Clutch damage acquired by aftermarket parts is the responsibility of the consumer.

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Bully Style Single Disc Clutch 12 Tooth Drive Gear UPDATED

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