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Pull the spark plug and see what it looks like with the original jet. it should be light brown and not covered with goo. If it is then the 40 is too big, If you change it out, drive it a while and check the plug again. The jet size is dependent on altitude and a smaller jet is better at high altitude so that you dont run rich.
Hey i have a is200 when i bought it the previous owner had a double din installed and he took out the factory amp now i want to change it back to factory head unit will it work without the amp, help!
dont Change the you need to Change your afr air fuel mix to work with the new pipe changing the main will be to much of a change but first see how it rides but if your doing it for more power or speed the best size main jet is the right one ether the one from the dealer if in your area or u need to find the right one for your area
The jets are for increased performance but the jets installed must be in relation to the pipe used. An open pipe would require larger jets. If the jets came with the pipe when the previous owner purchased it, then it should work. My advise would be to tune it up, sync the carbs, and time the sparks.
If all else fail, ask the previous owner to provide the stock jets and replace it. Stock jets along with the stock pipe will almost always run the first time. Sync the carbs and tune timing. If you have it all running smooth, from there you can do upgrades like stage 1 jet kit or purchase a performance exhaust.
Please do let me know if any of this was helpful, I'll follow it up should my suggestions fail,
Dont know what you are trying to set. Only thing about the jets you can set outside of changing the jet size is the little clip on the main jet needle top. Normally the middle groove. You can pop the factory plugs on the primary jets (idle jets) and mess with them a little to richen or lean it out a bit but they are preset at the factory. Normally a bit lean.
generally when installing after market performance exhaust, jetting the carb is necessary. until you get ahold of the previous owner and find out if the carb has been jetted, you can try and adjust the fuel air mixture screw and see if that helps. and like any engine especially bikes, it is possible to sieze the piston. it can be riden, but be careful of over heating. hope this helps...
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