
Please inform me as soon as the product is available again.
- part no.: 1101200
Plug & Play Kit Siebenrock Big Bore Kit – The Original: Powerful, uncompromising, and... more
Big Bore Kit 1070cc "S"
Plug & Play Kit
Siebenrock Big Bore Kit – The Original: Powerful, uncompromising, and time-tested.
Back in 2004, Siebenrock presented its groundbreaking 1070 cc Big Bore Kit to the public for the first time at the Intermot trade show. The innovative design – featuring a short, weight-optimized piston paired with a forged H-beam connecting rod measuring approximately 151 mm in length – was a technical highlight. The extended rod geometry ensures that the piston remains entirely within the cylinder bore, eliminating intrusion into the crankcase. This clever engineering concept received immediate acclaim and has since inspired numerous imitators.
More than two decades later, the Siebenrock BBK 1070, now equipped with the renowned asymmetric camshaft, continues to rank among the most powerful, reliable, and refined plug & play upgrade solutions for classic BMW 2-valve boxer engines. Delivering over 100 Nm of torque, it represents the perfect union of technical sophistication, German-made quality, and a genuine passion for engineering.
“Piston capacity can only be replaced by even more piston capacity” – this was the adopted motto during the company-internal development of the Siebenrock Big Bore Kit. The goal of this construction was to enhance the motor characteristics which were already outstanding thanks to the Power and Replacement Kits. We didn’t just say this, we went out and did it and the result for all BMW 1000 cc models from 1981 onwards was the 1070 cc Big Bore Kit, which turned out to be the ultimate solution for sporty touring riders. After modification, an amazing 80 hp is available at an engine torque of 92Nm. That’s what we call a convincing result.
This performance boost was achieved using 151 millimetre long, high-stability connecting rods which, when weight-optimized and fitted with ARP screws, only put 450 grams on the scales. Quite apart from this, 98 millimetre, weight-optimized pistons are used which only weigh 428 grams including the rings, bolts and clips. Thanks to the well-designed piston form, it is not necessary to adapt the cylinder head to the big bore.
Top quality.
Small production runs.
Engineered in Germany.
Made in Italy.
Siebenrock product.
Each original Siebenrock product bears this seal that guarantees the highest quality possible, consistently optimized down to the last detail.
All of the parts required to mount the kit are included within the scope of delivery:
2 cylinders with pistons
Piston rings
Connecting rod with ARP screws
Asymmetric camshaft
Gasket set camshaft
Gasket set cylinder
Socket for connecting rod screws.
TIP
Conrod bearing shell, art.no. 1124460, must be ordered seperately !
With MOT/TÜV approval and installation instruction.
Price for the set.
For the classic BMW 2-valve Boxer models
R 100, R 100CS, R 100RS, R 100RT
Monolever models R 100RS (x), R 100RT (x)
Paralever models R 100GS (x), R 100R (x).
(x) = only permitted for vehicles up to 31.3.1994.
TIP
The use of dual ignition is strongly recommended.
Ready-to-install camshaft including camshaft gear and front camshaft bearing on request.
Information on product safety
Siebenrock Big Bore Kit – The Original: Powerful, uncompromising, and time-tested.
Back in 2004, Siebenrock presented its groundbreaking 1070 cc Big Bore Kit to the public for the first time at the Intermot trade show. The innovative design – featuring a short, weight-optimized piston paired with a forged H-beam connecting rod measuring approximately 151 mm in length – was a technical highlight. The extended rod geometry ensures that the piston remains entirely within the cylinder bore, eliminating intrusion into the crankcase. This clever engineering concept received immediate acclaim and has since inspired numerous imitators.
More than two decades later, the Siebenrock BBK 1070, now equipped with the renowned asymmetric camshaft, continues to rank among the most powerful, reliable, and refined plug & play upgrade solutions for classic BMW 2-valve boxer engines. Delivering over 100 Nm of torque, it represents the perfect union of technical sophistication, German-made quality, and a genuine passion for engineering.
“Piston capacity can only be replaced by even more piston capacity” – this was the adopted motto during the company-internal development of the Siebenrock Big Bore Kit. The goal of this construction was to enhance the motor characteristics which were already outstanding thanks to the Power and Replacement Kits. We didn’t just say this, we went out and did it and the result for all BMW 1000 cc models from 1981 onwards was the 1070 cc Big Bore Kit, which turned out to be the ultimate solution for sporty touring riders. After modification, an amazing 80 hp is available at an engine torque of 92Nm. That’s what we call a convincing result.
This performance boost was achieved using 151 millimetre long, high-stability connecting rods which, when weight-optimized and fitted with ARP screws, only put 450 grams on the scales. Quite apart from this, 98 millimetre, weight-optimized pistons are used which only weigh 428 grams including the rings, bolts and clips. Thanks to the well-designed piston form, it is not necessary to adapt the cylinder head to the big bore.
Top quality.
Small production runs.
Engineered in Germany.
Made in Italy.
Siebenrock product.
Each original Siebenrock product bears this seal that guarantees the highest quality possible, consistently optimized down to the last detail.
All of the parts required to mount the kit are included within the scope of delivery:
2 cylinders with pistons
Piston rings
Connecting rod with ARP screws
Asymmetric camshaft
Gasket set camshaft
Gasket set cylinder
Socket for connecting rod screws.
TIP
Conrod bearing shell, art.no. 1124460, must be ordered seperately !
With MOT/TÜV approval and installation instruction.
Price for the set.
For the classic BMW 2-valve Boxer models
R 100, R 100CS, R 100RS, R 100RT
Monolever models R 100RS (x), R 100RT (x)
Paralever models R 100GS (x), R 100R (x).
(x) = only permitted for vehicles up to 31.3.1994.
TIP
The use of dual ignition is strongly recommended.
Ready-to-install camshaft including camshaft gear and front camshaft bearing on request.
Information on product safety
Fits for BMW R2V: | R 100 up to 84, R 100 RS/RT Mono from 87 on, R 100GS 87-96, R 100R 91-95 |
Downloads "Big Bore Kit 1070cc "S""
Read, write and discuss reviews... more
Customer evaluation for "Big Bore Kit 1070cc "S""
Write an evaluation
Evaluations will be activated after verification.
BMW 2v Boxer models
Standard sized
Standard sized
€12.50
Prices incl. VAT, plus shipping costs
Part no. 1124460
Set
BMW 2-valve Boxer models
€98.00
Prices incl. VAT, plus shipping costs
Part no. 1133330
BMW 2-valve Boxer models
€9.85
Prices incl. VAT, plus shipping costs
Part no. 6212303
BMW 2-valve models
Rear
Rear
€21.95
Prices incl. VAT, plus shipping costs
Part no. 1111739
Mahle
BMW 2-valve Boxer models from 9/80 on
LX56
LX56
€25.25
Prices incl. VAT, plus shipping costs
Part no. 1372080
Transmission output
BMW Paralever models
€19.80
Prices incl. VAT, plus shipping costs
Part no. 2312514
BMW 2-valve Boxer models
€19.95
Prices incl. VAT, plus shipping costs
Part no. 3317304
BMW R 65GS, R 80 G/S, R 80GS,
R 100GS, R 80GS Basic
"Plug and Play"
R 100GS, R 80GS Basic
"Plug and Play"
€319.00
Prices incl. VAT, plus shipping costs
Part no. 6212646
18mm
BMW 2v Boxer models from 9/75 on
€3.95
Prices incl. VAT, plus shipping costs
Part no. 1132995
BMW 2v Boxer models from 9/78 on
€49.50
Prices incl. VAT, plus shipping costs
Part no. 1114005
Silent Hektik
BMW 2v Boxer models from 9/78 on
€599.00
Prices incl. VAT, plus shipping costs
Part no. 1200100
BMW 2-valve Boxer models
€49.75
Prices incl. VAT, plus shipping costs
Part no. 1112240
BMW 2V Boxer with BIg Bore Kit 1070
€49.50
Prices incl. VAT, plus shipping costs
Part no. 1125401
Mahle
BMW 2-valve Boxer models up to 9/80
LX194
LX194
€13.25
Prices incl. VAT, plus shipping costs
Part no. 1372382
BMW 2-valve Boxer models
€3.95
Prices incl. VAT, plus shipping costs
Part no. 1112426
BING carburetor 64/32, 94/40
BMW 2V Boxer models
€11.40
Prices incl. VAT, plus shipping costs
Part no. 1311971
BING carburetor
64/26, 64/28, 64/32, 94/40
BMW 2V Boxer models
BMW 2V Boxer models
€11.40
Prices incl. VAT, plus shipping costs
Part no. 1311702
BING carburetor 64/32
BMW R 65, R 80, R 100 models
€11.40
Prices incl. VAT, plus shipping costs
Part no. 1311744
NEW
D=62mm
BMW R 100 Paralever models
€17.90
Prices incl. VAT, plus shipping costs
Part no. 1372362
NEW
Siebenrock Big Bore Kit 1070cc "S"
Gudgeon pin
Gudgeon pin
€0.95
Prices incl. VAT, plus shipping costs
Part no. 1109206
NEW
White painted
BMW R 65GS, R 80G/S, R 80G/S PD, R 80ST
€237.00
Prices incl. VAT, plus shipping costs
Part no. 4662635W
Iridium
BMW 4V models and R 2V with Big Bore Kit
BKR7EIX
BKR7EIX
€15.75
Prices incl. VAT, plus shipping costs
Part no. 1212125
NEW
Four ribs
BMW 2V Boxer models
Polished ribs, polished edges
Polished ribs, polished edges
€109.00
Prices incl. VAT, plus shipping costs
Part no. 1112375
NEW
BMW 2V Boxer models
€89.00
Prices incl. VAT, plus shipping costs
Part no. 1122284
Krauser 4-valve / MKM
€4.90
Prices incl. VAT, plus shipping costs
Part no. 11661204
Black coated
BMW /5, /6, /7, Monolever models
€249.00
Prices incl. VAT, plus shipping costs
Part no. 4671835
For spark plug
BMW R 100 models
€4.95
Prices incl. VAT, plus shipping costs
Part no. 1212000
Adjustable
BMW 2-valve Boxer models
€57.25
Prices incl. VAT, plus shipping costs
Part no. 1232409E
Oil pan distance ring
BMW 2v Boxer models
€18.50
Prices incl. VAT, plus shipping costs
Part no. 1113103
Simplex
BMW 2V Boxer models
€97.00
Prices incl. VAT, plus shipping costs
Part no. 1131183
Plug & Play
BMW R 65 9/80 on, R 65LS, R 65 Monolever 48hp
€1,079.00
Prices incl. VAT, plus shipping costs
Part no. 1100870
Mahle
BMW 2v Boxer models without oilcooler
OX37D two-piece
OX37D two-piece
€14.30
Prices incl. VAT, plus shipping costs
Part no. 1142145
Mahle
BMW 2v Boxer models with oilcooler
OX36D two-piece
OX36D two-piece
€14.95
Prices incl. VAT, plus shipping costs
Part no. 1142146
BMW 2-valve Boxer models
€139.00
Prices incl. VAT, plus shipping costs
Part no. 1113100
BMW 2v Boxer models from 9/78 on
€19.95
Prices incl. VAT, plus shipping costs
Part no. 1114444
Plug & Play
BMW R 80, R 80RT, R 80G/S, R 80ST, R 80GS, R 80R
€1,069.00
Prices incl. VAT, plus shipping costs
Part no. 1100080
Overhauled In exchange
BMW 2-valve Boxer models
€129.00
Prices incl. VAT, plus shipping costs
Part no. 1231642
BMW 2-valve Boxer models
Wank
Wank
€129.90
Prices incl. VAT, plus shipping costs
Part no. 1133638
BMW 2-valve Boxer models
€7.90
Prices incl. VAT, plus shipping costs
Part no. 6113170
NEW
Conrods 150,5mm
€2,695.00
Prices incl. VAT, plus shipping costs
Part no. 1101210
Plug & Play
BMW R 80, R 80RT, R 80G/S, R 80ST, R 80GS, R 80R
€1,069.00
Prices incl. VAT, plus shipping costs
Part no. 1100080
Stainless steel push rod tubes
BMW R 80, R 80RT, R 80G/S, R 80ST, R 80GS, R 80R
€1,159.00
Prices incl. VAT, plus shipping costs
Part no. 1100082
BMW R 100 models from 9/80 on
Conrods 150,5mm
Conrods 150,5mm
€2,695.00
Prices incl. VAT, plus shipping costs
Part no. 1101110
Plug & Play
BMW R 100, R 100CS, R 100RS, R 100RT, R 100GS, R 100R
From 09/180 on
From 09/180 on
€1,159.00
Prices incl. VAT, plus shipping costs
Part no. 1100103
BMW R 100 models from 9/80 on
Conrods 151,0 mm
Conrods 151,0 mm
€2,595.00
Prices incl. VAT, plus shipping costs
Part no. 1101100
Plug & Play
BMW R 100, R 100CS, R 100RS, R 100RT, R 100GS, R 100R
From 9/1980 on
From 9/1980 on
€1,069.00
Prices incl. VAT, plus shipping costs
Part no. 1100100
Left side
Krauser 4-valve / MKM
€0.00
Prices incl. VAT, plus shipping costs
Part no. 11661002
Stainless steel pushrod tubes
BMW R 75/6, R 90/6, R 90S, R 75/7, R 80/7, R 80RT
€1,179.00
Prices incl. VAT, plus shipping costs
Part no. 1100085
NEW
Plug & Play
BMW R 45 from 9/80, R 65GS, R 65 Monolever 27hp
€1,079.00
Prices incl. VAT, plus shipping costs
Part no. 1100860
BMW 2v Boxer models from 9/78 on
€329.00
Prices incl. VAT, plus shipping costs
Part no. 1131800
Plug & Play
BMW R 75/5, R 75/6, R 90/6 , R 90S up to 9/7
€1,179.00
Prices incl. VAT, plus shipping costs
Part no. 1100072
Silent Hektik
BMW 2v Boxer models from 9/78 on
€599.00
Prices incl. VAT, plus shipping costs
Part no. 1200100
Enduro
BMW R 65, R 80G/S, R 80GS, R 100GS, R 80GS Basic
€239.00
Prices incl. VAT, plus shipping costs
Part no. 1113120
Big Bore Kit "MAHLE"
BMW R 100 models
98mm complete with 3 rings
98mm complete with 3 rings
€399.00
Prices incl. VAT, plus shipping costs
Part no. 1109022
99mm Plug & Play
BMW R 100/7, R 100S, R 100RS, R 100RT
Up to 9/1980
Up to 9/1980
€1,179.00
Prices incl. VAT, plus shipping costs
Part no. 1100105
Plug & Play
BMW R 65 9/80 on, R 65LS, R 65 Monolever 48hp
€1,079.00
Prices incl. VAT, plus shipping costs
Part no. 1100870
BMW 2-valve Boxer models
€139.00
Prices incl. VAT, plus shipping costs
Part no. 1113100
NEW
Big Bore Kit "S"
BMW R 100 models
98mm complete with 3 rings
98mm complete with 3 rings
€399.00
Prices incl. VAT, plus shipping costs
Part no. 1109222
BMW 2V Boxer models from 9/78 on
SDZ
SDZ
€599.00
Prices incl. VAT, plus shipping costs
Part no. 1200150
Plug & Play
BMW R 45 up to 9/80
€1,096.00
Prices incl. VAT, plus shipping costs
Part no. 1100861
BMW R 45, R 65 models
€329.00
Prices incl. VAT, plus shipping costs
Part no. 1131180
Chrome
BMW /5, /6, /7 models
38mm
38mm
€398.00
Prices incl. VAT, plus shipping costs
Part no. 1812908
Plug & Play
BMW R 75/6, R 75/7, R 80/7, R 90/6, R 90S
€1,089.00
Prices incl. VAT, plus shipping costs
Part no. 1100084
BMW 2v Boxer models
Standard sized
Standard sized
€12.50
Prices incl. VAT, plus shipping costs
Part no. 1124460
Siebenrock Big Bore Kit
151,0 mm
151,0 mm
€272.00
Prices incl. VAT, plus shipping costs
Part no. 1109045
NEW
Floating
BMW R 80R and R 100R models
€219.00
Prices incl. VAT, plus shipping costs
Part no. 3411197
BMW R 65GS, R 80 G/S, R 80GS,
R 100GS, R 80GS Basic
"Plug and Play"
R 100GS, R 80GS Basic
"Plug and Play"
€319.00
Prices incl. VAT, plus shipping costs
Part no. 6212646
Set
BMW 2-valve Boxer models
Improved new edition
Improved new edition
€659.00
Prices incl. VAT, plus shipping costs
Part no. 4654100
Plug & Play
BMW R 100/7, R 100RS, R 100RT
Up to 9/1980
Up to 9/1980
€1,189.00
Prices incl. VAT, plus shipping costs
Part no. 1100104
NEW
Plug & Play
BMW R 60/5 , R 60/6 up to 9/1975
€1,179.00
Prices incl. VAT, plus shipping costs
Part no. 1100062
410W with PowerBlock
BMW 2-valve Boxer models
Digital single ignition 107mm centering
BMW 2-valve Boxer models
Digital single ignition 107mm centering
€1,049.00
Prices incl. VAT, plus shipping costs
Part no. SHZ2335
BMW 2v Boxer models
Centered position
Centered position
€469.00
Prices incl. VAT, plus shipping costs
Part no. 1142400
NEW
BMW 2-valve Boxer models
Basic
Basic
€685.00
Prices incl. VAT, plus shipping costs
Part no. 1113080
Sieenrock Big Bore Kit Touring
150,5 mm
150,5 mm
€309.00
Prices incl. VAT, plus shipping costs
Part no. 1109044
40 Years of Siebenrock
Anniversary Offer
BMW 2v Boxer models
BMW 2v Boxer models
€111.00
Prices incl. VAT, plus shipping costs
Part no. 1112261S40
Viewed