ATHENA offers you this top engine called Big Bore in Ø65mm which gives a 125cc for your 4FU engine mounted on your DERBI GPR, YAMAHA DT, DTR, TZR, .... This complete cylinder allows you to rebuild your engine but also to increase the displacement of this one for more pleasure. It is equipped with a scavenging transfer, 4 intake transfers and a standard oval exhaust with valve to have torque even at low rpm. It is equipped with a bi-ring piston to have a maximum of torque even at low rpm. The skirt of the piston is worked to improve the evacuation of gases (scavenging). This gives us a very powerful and reliable kit in the long term. It is important to know that the original top engine is rated at about 22 HP while the Big Bore from ATHENA is rated at 25.5 HP! The cylinder head is a 2 parts model to improve the cooling of the combustion chamber. This cylinder is designed to be mounted with the original crankshaft and the original pot. We only advise to adjust your original carburetor by changing the main jet to 270 is recommended as well as valves BOYESEN. But you can increase the performance by putting a sport exhaust such as ARROW, a 34 carburetor, cold spark plug, ... This kit is delivered as on the picture with its complete kit cylinder, piston, ring, clips, gasket pack, cylinder head, ... As a reminder the recommended price on the site ATHENA is 688.77euros!

Fits on :

YAMAHA DT125E 1988

YAMAHA DT125E 1989

YAMAHA DT125E 1990

YAMAHA DT125E 1991

YAMAHA DT125E 1992

YAMAHA DT125E 1993

YAMAHA DT125E 1994

YAMAHA DT125E 1995

YAMAHA DT125E 1996

YAMAHA DT125E 1997

YAMAHA DT125E 1998

YAMAHA DT125E 1999

YAMAHA DT125E 2000

YAMAHA DT125E 2001

YAMAHA DT125R 1988

YAMAHA DT125R 1988

YAMAHA DT125R 1989

YAMAHA TDR125 1993

YAMAHA TDR125 1994

YAMAHA TDR125 1995

YAMAHA TDR125 1996

YAMAHA TDR125 1997

YAMAHA TDR125 1998

YAMAHA TDR125 1999

YAMAHA TDR125 2000

YAMAHA TDR125 2001

YAMAHA TDR125 2002

YAMAHA TDR125 2003

YAMAHA TZR125R 1993

YAMAHA TZR125R 1994

YAMAHA TZR125R 1995

YAMAHA TZR125R 1996

YAMAHA TZR125R 1997

YAMAHA TZR125R 1998

YAMAHA TZR125R 1999

YAMAHA TZR125R 2000

YAMAHA TZR125R 2001

YAMAHA TZR125R 2002

YAMAHA TZR125R 2003

YAMAHA TZR125R 2004

YAMAHA DT125R 1990

YAMAHA DT125R 1991

YAMAHA DT125R 1992

YAMAHA DT125R 1993

YAMAHA DT125R 1994

YAMAHA DT125R 1995

YAMAHA DT125R 1996

YAMAHA DT125R 1997

YAMAHA DT125R 1998

YAMAHA DT125R 1999

YAMAHA DT125R 2000

YAMAHA DT125R 2001

YAMAHA DT125R 2002

YAMAHA DT125R 2003

YAMAHA DT125R 2004

YAMAHA DT125R/E 1988

YAMAHA DT125R/E 1989

YAMAHA DT125R/E 1990

YAMAHA DT125R/E 1991

YAMAHA DT125R/E 1992

YAMAHA DT125R/E 1993

YAMAHA DT125R/E 1994

YAMAHA DT125R/E 1995

YAMAHA DT125R/E 1996

YAMAHA DT125R/E 1997

YAMAHA DT125R/E 1998

YAMAHA DT125R/E 1999

YAMAHA DT125R/E 2000

YAMAHA DT125R/E 2001

YAMAHA DT125R/E 2002

YAMAHA DT125R/E 2003

YAMAHA DT125R/E 2004

YAMAHA DT125R/E 2005

YAMAHA DT125R/E 2006

YAMAHA DT125X SUPERMOTARD 2005

YAMAHA DT125X SUPERMOTARD 2006

YAMAHA TDR125 1993

YAMAHA TDR125 1994

YAMAHA TDR125 1995

YAMAHA TDR125 1996

YAMAHA TDR125 1997

YAMAHA TDR125 1998

YAMAHA TDR125 1999

YAMAHA TDR125 2000

YAMAHA TDR125 2001

YAMAHA TDR125 2002

YAMAHA TDR125 2003

YAMAHA TDR125 2004

DERBI GPR 125 2004

DERBI GPR 125 2005

DERBI GPR 125 2006

DERBI GPR 125 2007

DERBI GPR 125 2008

DERBI GPR 125 2009