Head bolt torque settings for a 1972 suzuki 90 motorcycle

most those bolts are TTY and are not reused.
and are set by angle. not torque.
I guess you never worked modern engines, or read the service manual first for all the steps in order ?
2.0L gas?
2.0. is not any suzuki engine name at all
and there are four(4) 2.0L engine used, 2 gas and 2 diesel
we can not guess engines, is it a USA car or not? I only answer for USA.
2.0 DDIS or AWD version < my guess is SuZ J20b?
2.0L vvt and vvt-i

SM< words , USA 2.0L gas VVT ,, (2.0L VIN 5, 6th digit?)

Before installing the cylinder head to the cylinder block, turn the crankshaft and position key within the specified range (30-90°) in the counterclockwise direction from the top.
Turn the crankshaft and position key within the specified range/,,
Crank key not UP, but before UP, 30 to 90 before
then
Install the cylinder head to the cylinder block.(do not lose 23 dowel pins)

1. Step 1: Apply engine oil to the cylinder head No. 1 bolt threads.
2. Step 2: Tighten the cylinder head No. 1 bolts to 15 ft. lbs. (20 Nm), evenly and gradually, in sequence.NOTE
   Use a 12-point socket wrench to tighten the cylinder head No. 1 bolts.
3. Step 3: Tighten No. 1 cylinder head bolts to 30 ft. lbs. (40 Nm).
4. Step 4: Tighten No. 1 cylinder head bolts an additional 60°.
5. Step 5: Tighten No. 1 cylinder head bolts an additional 80°.
6. Step 6: Tighten No. 2 cylinder head bolt to 19 ft. lbs. (25 Nm).
   Cylinder head tightening sequence

I never build engines off internet rumor , even mine
I buy the service manual based of VIN form Suzuki,

cylinder head bolts to 25 Nm (18 ft. Lbs.) And turn the bolts another 3 turns of 90 using the angular torque gauge KM-470-B
use either newton meters or ft/lbs. One is imperial and the other is metric Place a rock on a scale and weigh it in lbs of kg it is the same weight

fel_pro_torque_specs_guide.pdf

RIGHT! That's more like it.

The tightening order is a spiral from the front of the engine, all the big bolts first, then the little studs on the front:

10 6 2 3 7 - head bolts

9 5 1 4 8 - head bolts

13 11 12 14 - studs with M8 nuts

torques:

bolts:

stage 1: 20Nm

stage 2: angle tighten by 90 degrees

stage 3: angle tighten by 90 degrees

nuts: 20-23Nm

it doesn't specify what stage you do the nuts up, I've always done them up at stage 1 and then re-tightened them at stage 3 (they always go loose as the head clamps down)

well it's at alldata.com and at suzuki pitstop plus dot com.
here ill do that for you....
4 banger no displacement stated, now that is a challenge.


now the words..... USA car... 2.0L vin Z

Cylinder head bolts. Tighten the cylinder head bolts gradually and in the sequence shown. Tighten the cylinder head bolts to 18 ft. lbs. (25 Nm) and turn the bolts another 3 turns of 90 degrees using the angular torque gauge KM-470-B.

Cylinder Head Bolt Installation
Factory Method
For each cylinder head, start with head bolt numbered one. In increasing number sequence (1-2-3-4), tighten the head bolt in three stages.
1. Tighten each bolt to 7-9 foot pounds of torque.
2, Tighten each bolt to 12-14 foot pounds of torque.
3. Mark each head bolt and head with aligning marks. Tighten each bolt 1/4 turn (90 degrees).

Cylinder Head Bolt Installation
Torque Wrench Method

For each cylinder head, start with head bolt numbered one. In increasing number sequence (1-2-3-4), tighten the head bolt in four stages.

1. Tighten each bolt to 7-9 foot pounds of torque.

2. Tighten each bolt to 12-15 foot pounds of torque.

3, Tighten each bolt to 22-25 foot pounds of torque.

4, Tighten each bolt to 38-42 foot pounds of torque




Good luck, i hope this helps.

torque the head bolts at 35 ftp start at 10 going criss cross and then torque at full 35 fp.

8mm nut= 16.5 to19.5 lb/ft
9mm nut =21 to 24 lb/ft..