A correctly jetted carburetor makes a tremendous difference in the torque, midrange pull, top-end pull, and over-rev of your engine. If your bike is not correctly jetted, you will almost certainly gain some performance at some point in the bike's power band as well as preventing the situation that is displayed in the pictures below. A cleanly jetted pilot circuit can be the difference between having to clutch the bike out of a turn or not. The needle can make all the difference in the world for the power of the machine in most situations, as it controls the throttle range that most riders spend most of their time using. A correctly sized main jet could mean the difference between being able to rev out high enough to not have to shift one more time at the end of the straight, or the power falling flat on top and requiring you to make that extra shift. The only way to know what jetting changes you will need is by trial-and-error. No one can give you jetting specs, because every bike is different, every rider has a different style, and jetting is totally weather dependent.
What I do is not just take your bike, jet
it and get it back to you telling you "you're good to go".
Instead, with the help of you, we jet it together. This way I see how you
ride and you also learn the process and what to watch out for to prevent disaster.
What most won't tell you, is you can have a perfectly jetted bike one year and a
hole in the piston the next year. The reason for this, things can
change. You can get an air leak from a bad crank seal, blown cylinder base
gasket, crack in the manifold boots, a crankcase leak where the cases split or
even a clogged carb jet. What I'm trying to point out, is anything can
happen and if your educated enough about the jetting process, you will know what
signs to look for to limit future engine destruction.
Below are some pictures of what can happen if your jetting is NOT correct and in this case, TOO LEAN!
Not a pretty sight, is it?
Left plug is out of a nicely jetted bike - Right plug is from the bike with the hole in the piston pictured above
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