For a Honda 400EX, a common jet size is typically between 152 to 158, depending on modifications and altitude. If your 400EX has a stock engine and exhaust, starting with a 155 main jet is a good baseline. Adjustments may be necessary based on factors like aftermarket exhaust or air filter changes, so it's best to test and tune for optimal performance. Always consult your owner's manual or a mechanic for specific guidance related to your setup.
The size is 159 - 0 for this model. Using a calculator there is a way to determine exact size for other models as well.
GN4 Honda oil only.
10w-40 G4
Check the manufacturers manual.
yes, I use to race a 400ex also and I have a yzf250. they are both great starter bikes.
Any kind of DOT 3 brake fluid.
size 622
For this project, you should use a Phillips driver bit size 2.
You can use 10w30 in the summer. I suggest you purchase at least an owner's manual. Preferably a shop manual. Check out ebay.
To use the Jet you have to go to the Hangar in HQ (number 3 on the elevator pad) then walk out into the open part, go to the right of the open part and the jet should be there.
For this project, you should use a size 6 yarn crochet hook.
typically times new roman or cambria, and size 12