How to Check Primary Chain on Royal Enfield STD 350

General maintenance guide to check tension of the primary chain of a Royal Enfield STD 350. Also shows adjustment and oil change guide.

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Have the vehicle on center stand on a horizontal surface and then open the inspection hole.

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Using a 18mm spanner or in some old models you can use a coin since they have a slot for easy opening

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You will now have access to primary chain, insert a rod or screw driver to lift the primary chain to check tension.( Note do not put your finger in if the engine is running )

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Insert a screw driver underneath the primary chain

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Lift to check for at least 5-6mm or 1/4" slack

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You can use a normal ruler which has both mm and inch measure ( Borrow the tool from your school goer ). 5 - 6mm or 1/4th of an inch is the slack recommended

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If you decide to tighten the primary chain then remove this main bolt using a 18mm spanner rotating anti clockwise.

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Now oil may start oozing out from the case. To get better access you can press the brake lever and lock it in that position

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Unscrew brake lever stopper bolt to desired level

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Remove or loosen the foot peg using a 14mm spanner

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Now you will have more access to the primary chain cover.

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Pop open the primary chain cover. Oil will flow down, collect the old oil in a tray.

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You need to first loosen the locknut

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Use a 11 mm spanner to loosen the lock nut

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Use the same 11mm spanner to turn the bolt anti clockwise to increase tensioner height

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Check for slack again. Adjust till satisfied

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Put cover back and tighten the main nut. Inspect and decide on changing the gasket of the cover. Take care of the pin that slots thing together.

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Use a funnel to pour oil

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Pour any SAE 20W40 oil or use transmission fluid on non electric start motorcycles

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Pour oil slowly

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Until oil drips out of the drain plug at the bottom

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Wait for excess oil to drip out

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Plug the hole with the drainer bolt

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Tighten using 11mm spanner or with screw driver

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Close the inspection hole, do not forget the copper colored gasket

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Tighten using 18 mm spanner

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Tighten using 11 mm spanner or with screw driver

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Put back foot peg and tighten the nut using 14mm spanner

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Release the brake lever stopper screw and adjust as per your seating position and ergonomics.

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Inspect all nuts and bolts for tightness. Wear a helmet go for a test ride and adjust vehicle as per riding style.

Supplies

1 Tray
1 Spanner set
1 SAE 20W40 oil
1 Ruler
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