Dyno Jet Tuning Question - Update

[2fs2ns]

Turned screws out just over 3 turns.  Barely bogs at throttle up, midrange is good, and popping is better, but still present.  Starts popping under 4k rpms, but isn't as frequent.

Might try to turn out a little.  But I need to get a new air filter, be it stock or k&n before I really try to dial it in.

[Curtis_Valk]

Completely getting rid of the decel pop may be a futile persuit.  My '99 is completely stock and pops on decel some.  It's just hard to hear with the stock pipes.

Curtis

[2fs2ns]

That's cool then, aside from the popping it's running pretty smooth then.

Think a K&N will require needle adjustments?  Just stick with stock?

[Greg Cothern]

Ride it a few weeks, pull a plug and read it, white and chaulky too lean, dark brownish/black and wet too rich.  Want it a nice golden brown.

[2fs2ns]

I pulled my plugs last night, probably over 1k miles on them.  Looks like it's running a little lean as the plugs are a bit chalky.

I've also added a k&n since this original topic.

Would going to 108 jets be the best way to get more fuel in there?

[Greg Cothern]

105's should be adequate, moving the clip on the needle will probably cure the issue.

[archiefl98]

Figured I'd pop my head in on this one.  I'm the guy who did the writeup on shotsnapped.com about installing the DynoJet kit.  I put the 108 jets in and had a rough time of adjusting the pilot screws myself.  When I rejetted I had put a K&N air filter in, hacked the crap out of my mufflers (removed the baffle and the backplate) and had a bit of popping.  

I found out a little late that when I finally got rid of the popping I had turned the screws WAY too far out on the #1 and #3 carbs and ended up fouling two plugs.

After that I changed the plugs and started turning the screws from closed again.  I set them about 3 full turns out and still had minor popping.

Then I installed my Cobra exhaust.  Initially it was still a little bit cold outside here in NJ and I still had minor popping on decel.  Since it's warmed up I rarely have popping at all.  When I do it sounds like it's always on the same single cylinder, so I'm going to adjust the screws on the right side out another 1/4 turn, one cyl at a time until it's gone completely.

The DynoJet kit says to use the 108's with a modified or aftermarket exhaust.  I tend to think that they're not so much for "modified" as they are for "aftermarket" because things have been a lot smoother since the Cobra pipes.

My $0.02

-Arch

[Greg Cothern]

Arch, stock muffler mod is usually just the endplate and resonator "adjustments" LoL.  The rest of the pipe still has restrictions.
They simply dont flow enough for the aftermarket jets I dont think, especially without a K&N.
I have been playing with pilot adjustments with the Dyna-jet kits and found that 3 1/8- 3 1/4 turns out from a light seat are just about right for your scenario..

[archiefl98]

Thanks for the info, Greg.  I believe I'm at about 3 turns now, so I'll tweak the next 1/8-1/4 turn this weekend.

-Arch