Give me some JET advice please! By catrell92 (Read 545 times)

[catrell92]

the keihin carb on my CN250 motor came with a 110 main jet, the only thing ive done to the motor is replace the intake with a brand new 1, removed the emmisions airbox, and bought a new intake manifold and mounted a uni on the back of it. it is drivable and can rev high, but i do have to wait about 5mins for it to warm up until i can do WOT, it starts up pretty quick and idles strong, but i think i may have to go up in jet size just to make sure it isnt running lean, the last sparkplug did indicate it was on the lean side, it was kinda gray but faded. i just ordered a pack of jets with numerous sizes for $20 on ebay, my question is which size would you guys recommend i go up to first from a 110? its definitely drivable without hesitation but there is about a 3 second delay from 3/4 throttle to WOT. btw i upgrade to a iridium NGK and it idles ALOT smoother! heres a video, you can fast foward through it to see what im talking about, its like its not as "snappy" as it used to be.....btw, i fixed that high idle lol it was set too high but thats still the same response im getting with revving it up though

[Alleyoop]

You are very close so I would try the 115, if not enough then a 117.5 or 118.
Alleyoop

[catrell92]

maybe its just me but do you hear alot of "valve clatter" or does the engine sound good to you ? thx for the response btw!

[Alleyoop]

Valves sound good to me, you will know when they CLATTER they are loud. And you can actually hear them CLATTER CLATTER.
Alleyoop