KTM 50cc bike from 1995- 2001 used MORINI FRANCO MOTORI engines, some people say FRANCO MORINI MOTORI. These bikes are built solid and will be around for a long time, passed down from one kid to the next when they out grow them. Chassis parts are difficult to find but the Morini Franco engines are very popular and we have a great supply available.

Above is a 1995-1997 KTM 50SX or KTM50 SXR model. This year KTM 50 model uses a Morini Franco S5-E or S5N engine. The “E” code is for non-reed block STEEL cylinder. The “N” is code for non-reed ALUMINUM cylinder. This easy to see it from a distance because if the cylinder is “SILVER” in color is the aluminum cylinder. If its BLACK in color it's the STEEL cylinder. Both cylinders have a intake manifold with only two bolts.

The pistons are different for these two models. The STEEL cylinder piston rings are not the same top and bottom. The top ring is a “L” shape the bottom ring is just flat. The aluminum cylinder piston uses two flat rings.

1997 KTM50 Pro Junior

To the left is a 1997 KTM 50 Pro Junior model. This year KTM50 Pro Jr. model uses a Morini Franco S5-T engine. The “T” is the code for the 2-pedal reed block cylinder. The 1997 Junior model was the only year & model that used the “T” cylinder. This easy to see it from a distance because the cylinder is silver in color and uses a intake manifold with only two bolts. The piston has a round hole in the intake side. The ring are not the same top and bottom. The top ring is a “L” shape the bottom ring is just flat.

KTM50 Pro JR 1998-2001

To the right is a 1998 - 2002 KTM 50 Pro Junior model. These year models all use a Morini Franco S5-GS engine. The “GS” is the code for the 4-pedal reed block cylinder. This easy to see it from a distance because the cylinder is BLACK in color and uses a intake manifold with four bolts. The piston has a ovel hole in the intake side. The ring are the same top and bottom. Check the head gasket some models had a rubber “o”ring and other bikes had a copper ring/paper head gasket.

1997 – 2000 KTM Pro Senior

Above is a 1997 - 2000 KTM 50 Pro senior model. These year models all use a Morini Franco S5-GS engine. The “GS” is the code for the 4-pedal reed block cylinder. This easy to see it from a distance because the cylinder is BLACK in color and uses a intake manifold with four bolts. The piston has a ovel hole in the intake side. The ring are the same top and bottom. Check the head gasket some models had a rubber “o”ring and other bikes had a copper ring/paper head gasket. The other only difference for the different years is the clutch assembly. The early year bikes had a 2-shoe clutch design and the last couple of models had a disc style clutch. Its best to remove the clutch cover and see what model clutch style you have.

Have a 2001-2008 Model? Need Parts?

Have any questions about parts? Or need help choosing the right ones? our sales reps are some of the most knowledgeable. Ordering your parts doesn't get any easier than at MoriniFrancoUSA.com, email us we're here 24 hours a day. Or call (239)566-9666 9:00AM to 7:00PM eastern time Mon-Sun.