Great setup for high output GX200's that are destroying TAV2 30 series belts and shafts. Here is a brief video of our plate in use sent to me from a very happy customer with GX390 power. This is a custom fabrication piece which will typically be bolt on.In some fitment cases you may or may not need slight modification to fit, such as using washers behind the plate to move it out slightly, trimming the plate, trimming cylinder or head fins, trimming one of the gussets, oblonging mounting holes to index to your exact desire, depending upon how and where you want the plate to angle, your exhaust, etc.... It does include 12" of 3/4" keyed shaft, 2 locking collets, and a section of key stock. This is about 2 additional shaft length over what is typically needed to install a sprocket and driven unit, to give you some flexibility. The extra shaft length gives you a chance to mount a disc brake if you are unable to on your axle. If you want your kart to pull wheelies and still exceed 70mph, this is the way to get there, as seen on YouTube. The variable ratio gives almost 3:1 on take off, and up to 1:1 at speed, depending on which driven unit you go with. 40 series system components can be specifically tuned to your liking on engagement RPM's and upshifting speeds. The 40 series torque converter is typically separate units, but this plate will allow you to plug and play the entire system directly onto an engine, exactly like the 30 series currently does. This makes mounting, correct belt length, and chain adjustment much simpler, in nearly any application. Many potential customers have expressed interest in acquiring the backplate only. We are delivering exactly this, for the ultimate low-buck DIY setup. Our plate is very heavy 1/4" steel, and includes a 12" long 3/4 diameter keyed shaft for the driven unit and high speed sealed bearings. The bearings we use are USA made precision ground and rated beyond 5,000rpm continuous speed.
Pulley center-center distance is 8-3/16. This center distance was chosen as it is the shortest one which fits both the GX390 and Briggs Vanguard V-Twin engines, and also allows you to use any combination choices of 40/44 driver and driven units. With the drive pulley, these are available for 3/4", 1", and 1-1/8 engine shaft diameters. For the driven pulley, there are 2 choices of diameter on the market (7.5" 40D and 8.5" 44D), so you can select either to optimize your drive ratio range. Ratio ranges are 1.1 - 2.43 with 7.5" 40D, and 1.24 - 2.83 with 8.5" 44D.
Be sure to get the driven pulley you want in 3/4 bore diameter. Our design allows you to assemble your kit via the lowest cost possible and with the most flexibility.
You source both pulleys, belt, and your own drive sprocket. Drive sprocket and driven pulley needs to be for 3/4 keyed shaft, which are readily available in nearly all chain size and number of teeth.Tailor it to your exact needs. The included 3/4 driven shaft is extra long, which you cut down to size once you have installed your sprocket and driven pulley. Two 3/4 single bolt shaft collars are included to make assembly very easy, one will already be installed.
Install your sprocket on the shaft up against the plate, sandwiched between the plate and driven pulley, same as the 30 series TAV2 does. If you have a Vanguard twin, you can easily remove the oil filter adapter and install the Briggs filter delete plate kit, as we did on the Vanguard V-Twin pictured. Briggs part number 807689 is the oil filter block plate to do this. This is a single key component of a total system.
It has been designed to allow as much flexibility as possible in your configuration. Remaining assembly is as simple as drilling and bolting the plate to your engine and sliding the sprocket and driven unit onto the shaft, then adding the clamp. If you desire a belt guard, you will need to fabricate one. To recap, the following is what you will need to acquire to complete the system: 40 or 44 series driver and driven units, belt (depends which of the 2 different driven unit you are using), chain sprocket for 3/4 keyed shaft, and fabricate a belt guard if you want one. Depending upon crankshaft length, you may need to space the driver or driven unit for best belt alignment.
7.5 40D driven pulley - use Comet belt p/n 203785A or equivalent. 8.5 44D driven pulley, use Comet belt p/n 203787A or equivalent. Standard hp capability of the 40 series torque converter is 8-18hp range.
We have successfully used these at much higher power levels by using Kevlar belts. On the driven unit, you will need to acquire and install a "reverse wound" yellow spring, and reassemble the driven unit pulley to ride on the opposite ramps it normally ships with. This is called "outboard mounting" and is very easy to reconfigure for. Comet "reverse wound" yellow spring p/n 204524A.
The item "Heavy Duty 40 Series Torque Converter Back Plate Comet Clone TAV Backplate" is in sale since Saturday, December 26, 2020. This item is in the category "Sporting Goods\Outdoor Sports\Go-Karts (Recreational)\Parts & Accessories". The seller is "formula_boat" and is located in Livonia, Michigan. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Colombia, Costa rica, Dominican republic, Panama, Trinidad and tobago, Guatemala, El salvador, Honduras, Jamaica, Antigua and barbuda, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Saint lucia, Montserrat, Turks and caicos islands, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Ecuador, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Peru, Pakistan, Paraguay, Reunion, Viet nam, Uruguay, Russian federation.