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.

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

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 )

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

Insert a screw driver underneath the primary chain

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

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

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.

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

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

Unscrew brake lever stopper bolt to desired level

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Remove or loosen the foot peg using a 14mm spanner

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.

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

You need to first loosen the locknut

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Use a 11 mm spanner to loosen the lock nut

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

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

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.

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

Use a funnel to pour oil

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

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

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Pour oil slowly

Pour oil slowly

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Until oil drips out of the drain plug at the bottom

Until oil drips out of the drain plug at the bottom

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Wait for excess oil to drip out

Wait for excess oil to drip out

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Plug the hole with the drainer bolt

Plug the hole with the drainer bolt

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Tighten using 11mm spanner or with screw driver

Tighten using 11mm spanner or with screw driver

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

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

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Tighten using 18 mm spanner

Tighten using 18 mm spanner

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Tighten using 11 mm spanner or with screw driver

Tighten using 11 mm spanner or with screw driver

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

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.

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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