danteisme

i have honest abed pipes and plan on added my k&n this winter. i've already re-jetted (i cant remember off the top of my head what i used) and used a dyno jet kit. obviously i will know what i used previously once i tear down the bike.

here is my question. from the rejet matrix on this website is reccomends:
Aftermarket or stock pipes (baffles or debaffled) & Uni filter or K&N (airbox mounted):
150 or 155 main, 37.5 pilot jet, dyno spring, dyno needle on 3rd notch, mix screw at 2.5 - 3 turns. Adjust idle knob as needed to reach 1100 rpm.

From the dynojet instructions, it states to only replace the main with a 150 or 155 and no mention of the pilot jet. However it does say to turn the mix screw out to 3.5 turns.

what is the difference in replacing that pilot jet or not replacing it? Dynojet doesn't seem to think it is necessary, i don't recall what size the factory pilot jet is. what is the benefit to replacing the pilot jet like suggested in the rejetting matrix as opposed to leaving it alone as in the dynojet instructions? Does turning out the fuel mixture 3.5 turns vs. the 2.5-3 make up for not replacing the pilot jet?

v0lusia

The rejet matrix on this site is from dozens if not hundreds of bikes. It is meant to get you close and some people like to tweak from there. I personally would (and have) followed is instead of Dynojet's instructions. K&N says you don't need to rejet at all and 90+ percent of people have issues without rejetting.



The pilot controls idle, up to 1/3 throttle.
The needle controls 1/3 to 5/8 throttle
The main jet controls the rest

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danteisme

Great to know. Thanks!


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danteisme

gonna bump this back up. can someone confirm for me that this is the particular model pilot jet i need? it says 28mm long on their website, the stock one i pulled out isnt 28 mm long. its a hair of 20mm.

MIKUNI PILOT JET N224.103 #37.5

grego

The number is not an indication of length. It is some fuel-metering calibration.

danteisme

ah that will make a difference!

i received an email from them over my lunch break and confirmed that is the correct jet for a volusia 800

danteisme

i figured i would add some info to this, well actually info request. maybe i should start a new thread.

anyways...you riders that are in the northeast that have modified pipes and a k&n, what main jet did you use? i know this is all trial and error, especially without a tune. i'm just curious because the less times i need to take off my tank and carb the better as far as i'm concerned. i have the 37.5 pilot, not sure if i should throw in the 150 and see how it goes or just throw in the 155. i figured i would see what riders in the northeast on here have done and had work.