Quote:
Originally Posted by Dave Wolfe
Really sounds like the needle and mainjet not in harmony. If you know the type of jet kit which was used, the jetting database would be of help to get you in the ballpark. Dynajet jets numbers do not match keihin jets.
Ninjettes naturally have a flat spot in that rpm range.
You can experiment with using the choke in that rpm range. If choke helps, the mixture is lean in that rpm range.
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Note that NONE of the numbers in jetting-DB is for newgen (08-12) bikes. And they don't have any before AFR readings from wideband-O2 or dyno, so results are questionable.
What happens most times is carbs get clogged over time. Rather than disassembling and doing proper cleaning, people just install larger and larger gets over time to make up for clogged carbs. But hey, it works better after installing larger jets, so obviously factory ones were too small right? Except you keep on having to upsize jets over and over again as carbs gets more clogged.