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Re Jetting help

Sky Field · 2 · 89

Offline Sky Field

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I have taken out alot of restriction in my 2009 GT650R exhaust. Now there is some hesitation at high rpm at full throttle and crackle on deceleration. Im assuming this is due to a lean mix. I am planning on re jetting following one on of the guides posted on here. I am thinking of de snorkeling the airbox and AIS block off as well. Im thinking 135 and 137.5 size main jets to start with.
The only problem is I dont know what jets to buy exactly. It seems there is a variety of thread lengths and head sizes and shapes. is there a main jet standard that fits the hyosungs or a part number? Can someone point me in the correct direction. I figured its easier to ask online before taking apart my bike and measuring them.


Edit: I believe N100.604 is the main jet standard
« Last Edit: October 23, 2021, 05:30:10 AM by Sky Field »

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