Keihin Round Main Jets

A: There are a lot of variables that would go along with this answer. Please refer to your service manual on how to adjust jetting according to elevation and performance mods completed.

A: These are for Honda and Kawasaki carburetors. The pilot jet size will depend on your elevation and any after market components on your YZ250F.

A: There is not a specific setting I could give you for jetting your bike. It would really depend on your location (altitude/temperature) and how your bike is running with the current jetting. Jetting can be very tricky, there isn't one setting that will work everywhere with every bike. I would recommend taking your bike to a local motorcycle dealership’s service department to have your bike properly jetted.

A: There is not a specific setting I could give you for jetting your bike. It would really depend on your location (altitude/temperature) and how your bike is running with the current jetting. Jetting can be very tricky, there isn't one setting that will work everywhere with every bike. I would recommend taking your bike to a local motorcycle dealership’s service department to have your bike properly jetted.

A: The Dynojet main jets and the Keihin round main jets are measured the same way. A DJ120 main jet is the very close to a Keihin 120 main jet. You can use the Keihin main jet of the same size in-place of a Dynojet main jet.

A: The 2014 Kawasaki KLX110 came stock with a 78 main. http://www.motosport.com/dirtbike/oem-parts/kawasaki/2014/klx110/carburetor

A: FMF developed these specs with a 32:1 fuel to oil mixing ratio of a 50/50 mix of race fuel and super unleaded, 0 - 1500 ft altitude at 70 degrees outside temperature.

Please note: There are way too many variables in jetting to give you a recommendation that works perfect. Use these specs for a reference to help aid you with your specific bike.
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Jetting Results

Main Jet
170

Pilot Jet
48

Needle
STOCK

Needle Position
3RD

Power Jet
N/A

Air Screw
1.25

Fuel Screw
N/A

http://www.fmfracing.com/RiderSupport/JettingCenter

A: The stock jets for your 1998 Kawasaki ZX6R would be 140 main and 12.5 pilot and can be found in our OEM section here:
http://www.motosport.com/motorcycle/oem-parts/kawasaki/1998/zx6r/carburetor-parts

*Note: All parts and specs here at Motosport are for US models only.

A: Yes, the 1998 Kawasaki KX80 has a Keihin PE26 carburetor. There is not a specific setting I could give you for jetting your bike. It would really depend on your location (altitude/temperature) and how your bike is running with the current jetting. Jetting can be very tricky, there isn't one setting that will work everywhere with every bike. I would recommend taking your bike to a local motorcycle dealership’s service department to have your bike properly jetted.

A: The stock size for your main jet in your 2007 Yamaha TTR230 would be a 125.