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The chain should have some slack however if it is too lose you will have failure.This bike has a tensioner on the underside of the chain which may make chain tension seem tight compared to other bikes you might be used to. The chain slack is likely in 1" to 1.5" slack at the middle of swingarm.The Chain Drive is made up of the following:* rear sprocket* chain adjuster block* chain guide* chain slider* chain roller / tensioner This bike has a tensioner on the underside of the chain also known as the chain roller. The chain slack is likely in 1" to 1.5" slack at the middle of swingarm. The chain should have some slack however if it is too lose you will have failure. Use the Chain Adjuster Block to reduce tension on the chain if it is tight. New bike often has chain very tight. Adjusting chain:#Loosen the rear axle nut#Loosen the lock nuts on both sides of the swing arm#Turn the adjusting nuts on the right and left chain adjusters an equal number of turns to increase or decrease chain slack.#Torque the rear axle nut to around 35 lb-ft#Tighten the adjusting nuts lightly. Then, while holding the adjusting nuts with a wrench, tighten the lock nuts.#Recheck drive chain slack.===Rear Suspension===The Rear Shock Absorber on the Tao is a One-Way Adjustable Shock Absorber type with a double ring hand turn wheel at the bottom and a inert gas valve.* Adjust spring by rings for pre-load using a spanner wrench.* Add or reduce nitrogen gas from valve for hardness.Use a C Spanner Tool. (spanner wrench) or in a pinch a pipe wrench will work but can mar up the rings.Uses a 10.5" Inch Rear Black Mono Shock Spring 980lbs==Parts==Fuel Tank Valve / Petcock for DB 17<BR>[[File:taotaodb17fuelshutoffvalve.jpg]]* [https://partskit.com/product/104324-1 partskit.com : SKU - 104324-1]* [https://xgatorparts.com/product/myk-fuel-tank-valve-petcock-fits-tao-tao-db17-and-many-other-models/ xgatorparts.com : misc parts]