K&N Powerlid

[J. Allen]

This is what I'm looking for, thanks. Although I do not ride in the rain and try to avoid any water so I might not have that bad of a problem. Did you rejet as per the K&N manual or did you already have other mods with proper jetting? The K&N instructions are saying increase jet size on one side more then the other. IE, increase the left side 7 sizes and the right side 11 sizes. (If going from a stock box with lid to the PowerLid).

 

If you do a search on "powerlid" here I think you'll find that the consensus is that whomever wrote the jetting recommendations was probably suffering from heat-stroke, drug-induced delirium, or severe mental retardation. I have no clue what the rationale for jetting carburetors differently would be, save for a V-twin where the rear cylinder might not see the same airflow as the front. Maybe someone else with more knowledge can chime in . I know the majority of the Raptor boys jet theirs differently but that I believe has something to do with the fuel rail (delivery) and the carbs serving a primary and secondary role? Anyway....

 

I'm not sure what your mods are, however, assuming that you're utilizing the stock 26 mm Mikuni's: I'm running DMC 916 pipes, a K&N filter, open airbox, and a coolhead with 20cc domes at about 700 feet above sea level. I have 320 mains, needle clip 4th notch [one down from the highest (leanest) setting], and 27.5 pilots. My plugs are a nice tan color. Please note that I utilized these same setting while I had the powerlid installed and they worked equally well (until it got wet). I don't think that the coolhead affects jetting too much. Each engine is a little different and you just have to play with it to get it right. Do some runs on new plugs, or chops as suggested in many topics on here. If you search jetting you'll find dozens of threads and by looking at what others with similar modifications have had success with you'll have a decent starting point.

 

Good luck.

[bones]

Thanks. I figured those K&N instructions to be "different". I have FMF SST pipes/silencers, K&N primary filter and no snorkel with stock airbox lid. Currently running 290 mains and 27.5 pilots. My needle was bumped one notch (I forget which direction). Elevation about 1600 feet. Plug chop turns out good with these current mods, maybe even a little rich. I had 280 mains until I put in the K&N with the lid and figured I'd bump up to 290 just in case. Havn't done a plug chop since.

Edited July 10, 2008 by bones