2023 BMW F750GS valve clearance and spark plug guide

5.1 Remove the seat

Goal Expose the top middle body panel and start the access sequence from the rear forward.

Where it is: the seat lock is on the left side near the rear of the seat. The seat slides rearward and upward after the lock is released.

1. Place the motorcycle securely on its stand on level ground.
2. Turn the seat lock with the ignition key.
3. Press the seat slightly to unload the latch if needed, then lift and slide the seat rearward out of its front holds.
4. Set it on a clean surface so you do not scratch the cover.

5.2 Remove the front spray guard, then the top front-wheel cover

Goal Free the forward bodywork stack so the tank cover and side panels can come off in the right order.

Where they are: the front spray guard is the small lower splash piece directly behind the front wheel. The top front-wheel cover is the upper arch-shaped plastic piece above it, tucked into the left and right side panels.

1. Remove the screws holding the front spray guard.
2. Pull the spray guard free of the retaining lugs in the upper front-wheel cover.
3. Now release the top front-wheel cover from the retaining lugs in the left and right fairing side panels.
4. Note the locators as it comes out. Do not twist it sideways; pull it free deliberately so you do not snap a tab.

5.3 Remove the center fuel-tank cover

Goal Expose the fasteners and overlaps for the side panels and open access to the tank mount area.

Where it is: this is the middle plastic cover directly on top of the tank, the one you see immediately after seat removal.

1. Remove the visible screws front and rear.
2. Lift the cover while watching the molded mounting clips and retaining lugs.
3. Set it aside with its clips facing up so you do not bend them.

5.4 Remove the left and right radiator cowls and the side-panel/badge-holder assemblies

Goal Clear the sides of the tank so the fuel tank can lift off.

Where they are: the radiator cowls are the smaller pieces immediately beside the radiator openings. The fairing side panels with badge holders are the larger side pieces directly behind them.

1. Remove the left radiator cowl screws and release the cowl while noting the mounting clips.
2. Do the same on the right side. The manual's clearest dedicated cowl figure in the text is the left-side procedure; the right side mirrors it.
3. Remove the left and right side-panel / badge-holder assemblies. BMW repeatedly lists these assemblies as preparatory items in the engine procedures.
4. Do not split the panel from the badge holder unless you need to repair that assembly. For simple service access, remove the assembly and set it aside as one unit.

5.5 Remove the fuel tank

Goal Expose the intake air silencer and the top of the engine.

Where to work: on top of the frame backbone under the tank, then under the lifted tank for the electrical connectors and fuel line quick connector.

1. Pull off the two hoses called out by the manual.
2. Remove the tank mounting screws.
3. Lift the tank and support it on a wood block exactly as the manual shows. Do not let it hang on its hoses.
4. Disconnect the electrical connectors for the fuel pump and level-sensor circuits.
5. Open the latch and disconnect the fuel line quick-action coupling.
6. Lift the tank off the rubber damper and move it to a safe bench.

5.6 Remove the intake air silencer (airbox)

Goal Expose the direct ignition coils and the top of the valve cover.

Where it is: the large plastic airbox sitting above the throttle-body area.

1. Release the left and right intake snorkels from their holders.
2. Release the hoses from their locators and remove the silencer mounting bolt.
3. Press the locks and disconnect the crankcase-vent hose.
4. Open the clamping collars as the manual shows.
5. Lift the silencer, disconnect the intake-air-temperature sensor connector, and remove the silencer.

5.7 Remove the direct ignition coils, then remove the spark plugs

Goal Clear the plug wells and make the engine easier to rotate by hand later.

Factory logic plus practical logic: BMW treats the spark plugs and the valve check as separate procedures. For a combined service, it is smart to pull the plugs after the coils come out because the engine will turn much more easily while you are finding the valve measurement positions.

1. Blow compressed air around the tops of the coils before touching them.
2. Unlock the vibration-resistant coil connector exactly the way the manual shows. Push the connector away from the lock; do not pry up on the locking tab.
3. Pull the coil straight up. The manual specifies puller 12 3 621.
4. Once both coils are out, blow out the plug wells.
5. Use the thin-wall 14 mm spark plug socket to remove both spark plugs.

5.8 Remove the valve cover

Goal Expose both camshafts and rockers for measurement.

Where to work: top of the cylinder head.

1. Disconnect the injector connector identified on the valve-cover page.
2. Remove the valve-cover screws.
3. Lift off the cylinder-head cover and the seal.
4. Remove the cover seals / grommets and set them aside only if you are replacing them immediately; the factory installation procedure assumes new seals.

5.9 Remove the crankshaft access plug and learn where you will turn the engine

Goal Create a controlled way to rotate the engine by hand.

Where it is: on the left engine cover there is a large threaded crankshaft access plug. Behind it is the crank-turning point. Nearby is the smaller dowel-hole access used only when you are moving into the TDC-locking adjustment branch.

1. Remove the large crankshaft access plug and keep its sealing ring with it.
2. For measurement only, you do not need to remove the dowel-hole bolt yet.
3. Fit a ratchet and the correct socket to the exposed crank-turning point behind the large access plug.
4. From here on, rotate the engine only by hand, slowly.

6.1 Rotate the engine until one cylinder is on the base circle and both rockers are loose

Goal Get to the correct measurement position, not just a random cam position.

What you are looking for: both cam lobes for the cylinder you are measuring must be on their base circles. In plain English, the pointy high spots must be pointing away from the rocker pads so the valves are fully closed and the rockers have lash.

1. Turn the engine slowly on the crankshaft with the ratchet.
2. Watch the two lobes for the cylinder you are checking.
3. Stop when neither lobe is pushing its rocker and you can feel a slight free movement at both rockers.
4. This is the condition the manual calls camshafts on the base circle with the rocker arms not actuated.

6.2 Measure each valve between cam and rocker arm

Goal Record the actual intake and exhaust clearances on this cylinder.

Where the feeler goes: between the camshaft and the rocker arm. The adjustment plate / shim is below the rocker, on the valve side. You are not sliding the feeler where the shim sits.

1. Slide the appropriate feeler blade between the cam lobe base circle and the rocker arm.
2. Use the classic "light drag" feel: the blade should move with slight resistance, not jam and not fall through loose.
3. Record the largest blade that fits with light drag for each intake and exhaust valve.

6.3 Rotate to the other cylinder and measure the same way

Goal Measure all valves on both cylinders.

The manual says to continue turning the engine until the right cylinder is at firing TDC and then measure in the same way. In practical terms, you are doing the same thing you just did: rotate until both lobes for the next cylinder are on their base circles and both rockers are loose, then measure.

1. Continue turning the engine slowly by hand.
2. Watch the other cylinder's lobes until they reach the same unloaded base-circle condition.
3. Measure both valves on that cylinder and record them.

6.4 Decision point: are all clearances within spec?

If every intake is between 0.11 and 0.20 mm and every exhaust is between 0.30 and 0.35 mm, you are done with the valve portion. Skip to reassembly. If even one valve is out of range, go to the adjustment branch.

7.1 Set the engine to TDC and lock it with the alignment pin

Goal Put the crankshaft at the BMW-defined TDC locating position before cams come out.

Where to work: same left-side crank access area as before. Now you also remove the smaller dowel-hole bolt so the alignment pin can engage.

1. Remove the smaller dowel-hole bolt only now, because you are entering the adjustment path.
2. Insert the alignment pin into its access bore.
3. Turn the engine slowly by hand until the pin seats fully.
4. Then verify the cams visually. Pin seated means the crank is at the TDC locating position. You still confirm cam position so you know you are at the correct TDC event for the job.

7.2 Remove the normal timing-chain tensioner

Goal Release normal chain tension before the cams come out.

1. Remove the tensioner screw plug with its O-ring.
2. Remove the timing-chain tensioner with its O-ring.
3. Keep its parts together and inspect the O-rings.

7.3 Remove the slide rail and camshaft bearing cap unit

Goal Free the camshafts without distorting the bearing bracket.

1. Remove the slide rail bolts and the slide rail.
2. Loosen the bearing-cap-unit screws uniformly in a crosswise pattern.
3. Remove the screws and sealing washers.
4. Lift off the bearing bracket / cap unit.
5. Keep the sealing rings and washers organized if you are comparing old to new parts.

7.4 Remove the camshafts

Goal Lift the cams out of the timing chain so the rocker arms can swing up and the adjustment plates can come out.

1. Feed the exhaust camshaft out of the timing chain and remove it.
2. Remove the inlet camshaft the same way.

7.5 Change the adjustment plate(s)

Goal Install the correct thickness plate on any valve that measured out of spec.

1. Swing the rocker arm up.
2. Remove the adjustment plate from the valve and keep it labeled by valve location.
3. Measure the old plate with the caliper.
4. Calculate the new plate thickness from your measured clearance and chosen target clearance.
5. Lightly oil the new plate and place it on the valve.
6. Swing the rocker back down.

Shim math:

Example: old intake plate 2.50 mm, measured clearance 0.08 mm, target 0.15 mm. New plate = 2.50 + (0.08 - 0.15) = 2.43 mm.

7.6 Reinstall cams, bearing cap unit, and set timing

Goal Put the cams back in with the crank locked at TDC, then do the final timing adjustment before torqueing everything for good.

1. With the engine secured in TDC setting with the alignment pin, oil the bearing seats.
2. Tighten the timing chain on the inlet side and insert the inlet camshaft into the chain while noting the marks.
3. Install and align the exhaust camshaft the same way.
4. The marks must be parallel to the sealing surface and in line with each other, exactly as the manual says.
5. Check the cam positions and the sensor-gear position.
6. Reinstall the bearing cap unit, making sure the axial guide is correctly positioned.
7. Torque the cap-unit fasteners in sequence: 5 Nm first pass, 15 Nm second pass.
8. Install the slide rail and torque its bolts to 10 Nm.
9. If you are following the BMW timing procedure exactly, loosen the cam sprockets slightly, install the special timing-chain tensioner tool 11 0 773 hand-tight, make sure its adjusting screw is not already pressing on the chain rail, then tighten the adjusting screw to 1.2 Nm.
10. Use the BMW holding fixture and socket wrench as described by the manual to verify / adjust the cam position, then torque the cam sprocket screws to 19 Nm.
11. Remove the holding fixture, release the TDC locator, rotate the engine, then tighten any sprocket screws that were not yet accessible, again to 19 Nm.

7.7 If final timing is off, correct it deliberately - do not just jump the chain blindly

If your final timing check shows the cams are not where they should be after hand rotation, stop and reset it methodically:

1. Return the engine to TDC and lock it again.
2. Remove normal tensioner pressure if needed.
3. Re-check cam position, chain tension, and sprocket freedom.
4. Use the sprocket-loosened timing-adjustment method again before deciding the chain is truly one tooth off.
5. Only if the chain is actually a tooth off do you re-index it and then repeat the timing procedure.

8.1 Install the valve cover with new seals

1. Install the new cover seals.
2. Apply 3-Bond 1209 in the arrowed spots shown by the manual.
3. Install the new main cover seal.
4. Set the cover down carefully, making sure the seal stays seated.
5. Install and torque the cover screws to 10 Nm.
6. Reconnect the injector connector.

8.2 Install the spark plugs and coils

1. Install both spark plugs by hand first so they cannot cross-thread.
2. Torque each spark plug to 12 Nm.
3. Push the direct ignition coils straight into the plug shafts until fully seated.
4. Reconnect and lock the coil connectors.

8.3 Reinstall the intake air silencer

1. Lower the intake silencer into place and push the bypass pipe onto the throttle-body assembly.
2. Reconnect the air-temperature-sensor connector.
3. Close the clamping collars.
4. Reconnect the crankcase-vent hose until the locks snap audibly.
5. Install the silencer mounting bolt and torque it to 8 Nm.
6. Secure the hoses in their locators and reinstall both intake snorkels.

8.4 Reinstall the fuel tank

1. Set the tank onto its rubber damper.
2. Support it on the wood block again while reconnecting the electrical plugs.
3. Reconnect the quick fuel line only with the latch open / pressed, then release the latch and confirm a positive lock.
4. Install the tank fasteners and torque them to 19 Nm.
5. Reconnect the hoses.

8.5 Reinstall the crank access plug, and the dowel-hole bolt if you removed it

1. Install the dowel-hole bolt with its sealing washer if it was removed.
2. Torque the dowel-hole bolt to 10 Nm.
3. Install the crankshaft access plug with its sealing ring.
4. Torque the crankshaft access plug to 10 Nm.

8.6 Reinstall the side panels, cowls, tank cover, top front-wheel cover, spray guard, and seat

1. Reinstall the left and right side-panel / badge-holder assemblies.
2. Reinstall the radiator cowls.
3. Reinstall the center tank cover.
4. Reinstall the top front-wheel cover, then the front spray guard.
5. Reinstall the seat and verify it clicks fully into place.

8.7 Final checks before first ride

1. Visually confirm no tools or rags remain in the airbox or on the head.
2. Turn the engine by hand again if you disturbed timing and make sure it rotates smoothly with no binding.
3. Start the bike and listen for abnormal noises.
4. Check for fuel leaks at the quick connector and for oil seepage at the valve cover.
5. After a short heat cycle, recheck the cover area and general fastener security.