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*This product is for the Japanese market, so the product may not be compatible or the specifications may differ depending on the vehicle in which you tend to install. *The products we deliver to you are for the Japanese market and may not be legal in your country due to differences in regulations and safety standards. *Interchangable parts and alternative part. In some cases, the manufacturer may consolidate the part numbers of genuine parts, we so call "interchangable parts", or change them to alternative parts. Under manufacturer warrants, the new parts can be used without any problems. However, please be aware that the appearance of the parts may differ from the original and we do not accept any claims to change product due to this reason. * Please note that we are unable to provide you with any information regarding the specifications of the parts. * We do not accept the cancellation of OEM products once you place an order.
I always wanted to switch my 1987 TW200 TK carb main Jet from #116 TO #114.,MY BIKE RUN SMOOTHLY NOW .I have driven my bike about 4000KM so far after installing this #114 MAIN JET & I'm so glad to have this main jet because my bike runs great .it's a great investment when you try to rebuid carburetors by your own .carb tuning isn't MAGIC. It's a simple step-by-step process. It doesn't matter of you are tuning a diffrent bike carburetors , the concepts are the same. It just takes patience and persistance. Now, don't go by how I have my carb tuned. Odds are my tune won't be right for your bike.There are three adjustments in fuel metering in nearly all carbs. Some carbs have more. We will be working with 1) the pilot jet and screw, 2) the needle, and 3) the main jet.All three have an effect at all engine speeds/throttle settings. Adjustments to the pilot jet and screw have the most effect at low throttle settings. Needle adjustments have the most effect at mid throttle settings. Main jet adjustments have the most affect at high throttle settings. However, the main jet does affect part-throttle operation, but not much. The pilot jet and screw do affect operation at high throttle, but not very much.It is best to give the carb a good rebuild first unless the carb is practically new. You can't tune mechanical problems out of the fuel system. Make sure everything is clean, tight, and seals where it is supposed to seal. Make sure the float moves freely and is properly set, and that the fuel flow needle and seat upon which the float works are clean and in good condition. Make sure any diagphram is pliable and free of holes, tears, and wear. Make sure any shafts going through the carb body seal properly. Make sure there are no leaks in the rubber boots in which the carb mounts. Make sure there are no vacumn leaks.Once the carb is in perfect condition you can start the rejet process. 1) Start with the main jet first. 2) Then work with the needle height for best part-throttle engine response. 3) Finally, work on the pilot and screw to optimize idle and starting characteristics. I SET MY 1987 TW200 CARBURETOR TO THE FACTORY SETTING .#114 MAIN JET #40 PILOT JET , PILOT SCREW/AIR SCREW 1 AND HAFT TURN FROM FULLY SEATED.MY BIKE RUNNING GREAT .I WANNA CHECK MY SPARK PLUG AFTER INSTALLING THIS 114 MAIN JET. SPARK PLUG IS SO GOOD NOT TOO LEAN . PREFECT #114 MAIN JET FOR 1987 TW200.I like to run the main jet a tad richer than optimum performance to lower engine temperature, but not rich enough to foul plugs or wash down the cylinder walls.I sometimes choose the main by reading plugs after some full-throttle plug chops. Another way to choose a main is to try several jets and see which gives the best top end. If you get too rich or too lean the bike slows down.Much cheaper than buying a bunch of spark plugs.Other performance characteristics of a too-lean mixture are popping back through the carb when you shut the throttle while decelerating, the engine pings (pre-ignition), or the engine surges, which kind of feels like the throttle is being rolled back and forth. A main jet sized one up from any of these symptoms of too lean is usually as close as you are going to get. A word of warning on non-Yamaha main jets:There are jets available for a number of different brands/models of carbs that will work in the TW carbs, but their numbering systems do not coincide with that of the Yamaha jets. A 114 #jet of another type will be richer or leaner than a #114 OEM YamahaMAIN Jet. These alternative jets tend to be cheaper and do work, but you'll have to figure out how they relate to your current OEM YAMAHA Jet yourself.View Detail
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