Exhausts and Engine » Valve clearance check on the R1250 engine.

R1200RS + R1250RS Forum � 1250 RS technology � Exhausts and Engine � Valve clearance check on the R1250 engine.

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#1 | Valve clearance check on the R1250 engine. datum

Sun Mar 12, 2023 6:45 pm

I've just checked the valve clearances on my 2020 R1250RS.
I have 20000 kms on it, and so it was time according to the BMW schedule.
If it's of any interest, here's what I found:

LHS

IN
0.15mm (F) 0.15mm (R)
EX
0.40mm (F) 0.40mm (R)

RHS

IN
0.13mm (R) 0.13mm (F)
EX
0.37mm (R) 0.38mm (F)

The spec is 0.10~0.17 for inlet and 0.34~0.41 for exhaust.

The LHS clearances are on the loose side, especially the exhausts, but as I'm not sure which way they will go I'm going to leave things until the next check.
I was able to measure to a resolution of about +/- 0.01mm by using a combination of two gauges. Best I could do.

Eventual master of the obvious
2020 BMW R1250RS Sport
Austin yellow

these members like the post: Dave H and Sanemancured

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#2 | RE: Valve clearance check on the R1250 engine. datum

Tue Mar 14, 2023 7:55 am

Is it the same tolerances for the 1200?

Does anyone know the standard shim sizes available from BMW?

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#3 | RE: Valve clearance check on the R1250 engine. datum

Tue Mar 14, 2023 10:14 am

The clearances for the 1200 are exactly the same as the 1250 as in post #1.
Shims are available in 0.02mm increments from BMW.
Whether your dealer will supply you with shims or not is the question. I don't know if aftermarket shims are available. Probably.
When you measure, make sure you have the engine at TDC on firing stroke for that cylinder. There is a handy inspection hole on the LH engine case. Remove the plug and look inside for the LARGE hole as you rotate the engine. Easy to do without removing spark plugs with the gearbox in top gear by rotating wheel in forward direction.
If you need to adjust, special tools may be required. Do your homework before you replace shims yourself. Checking is simple.

Eventual master of the obvious
2020 BMW R1250RS Sport
Austin yellow

these members like the post: Bikepirate and c10

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#4 | RE: Valve clearance check on the R1250 engine. datum

Sat Mar 18, 2023 2:26 pm

Zitat von Steady Eddie im Beitrag #1
I've just checked the valve clearances on my 2020 R1250RS.
I have 20000 kms on it, and so it was time according to the BMW schedule.
If it's of any interest, here's what I found:

LHS

IN
0.15mm (F) 0.15mm (R)
EX
0.40mm (F) 0.40mm (R)

RHS

IN
0.13mm (R) 0.13mm (F)
EX
0.37mm (R) 0.38mm (F)

The spec is 0.10~0.17 for inlet and 0.34~0.41 for exhaust.

The LHS clearances are on the loose side, especially the exhausts, but as I'm not sure which way they will go I'm going to leave things until the next check.
I was able to measure to a resolution of about +/- 0.01mm by using a combination of two gauges. Best I could do.

All in spec. They will most likely close up with age as the seats submit to constant hammering from the valves. I really wouldn't worry myself.

jrt likes the post

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