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Pod jetting suggestions requested

3K views 18 replies 11 participants last post by  WSC 
#1 ·
I was looking through the many posts on this and am having a bit of trouble deciding where to start. Perhaps my setup is not very common.

I have a 99 Adventurer with everything stock (including exhaust) EXCEPT the pods which will be Uni UP4229s (3" OD, 4" length).
http://www.unifilter.com/online catalog/universal.html

Most people seem to like K&N's or Emgos, but I have noted with some amusement that Uni offers a foam cover for K&N pods. :) I like foam and oil in my filters...

The other unusual thing is my aims. At my age I don't need any more power in this bike (if I get some more that's OK but it is not my aim). What I would like is ease of service and looks and retaining the excellent fuel economy, which is 51.1 MPG US. Also I am about at sea level and sometimes ride into the mountains. So, I probably want the jetting a bit leaner than most folks.

I've seen suggestions for mains going from 120 up to 138 or so. Lots of people like 40's for pilots. Not sure about the needle, maybe 1 shim? (Of what thickness?)

Does 120 mains, 1 shim, 40 pilots sound like a good starting point?
 
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#2 ·
When I bought my TBS it had pod filters and stock mufflers.

it had 114 DynoJet mains.

38 pilots and Dynojet needles.

It ran great at near sea level in Rhode Island where I bought it.

When I got it home (Indiana about 800 ft elevation) it would not idle.
I put it back to stock with airbox etc.

Do the next owner a favor and don't do any cutting etc to the air boxes.
Replacing all that stuff costs 300$ plus.

That's for all the clamps, rubbers and both air boxes.


Dyno Jet mains are different sizes than Kehin jets.
There is a chart posted here and it was posted originally by cafetbird.
 
#3 ·
Do yourself a huge favour and throw those pods out. In 12 years of TBS onwership, I have heard all the claims yet I have YET to see one, just one TBS or TB with pods or hacked open airbox running right.


What do I know though! I just passed 100,000 km on my bike.
 
#4 ·
I've read of difficulties concerning mods with Mikunis, here & on the T3 Sport Touring section, but results with Keihins seem much better?

Using train5's generously shared dyno results I'm running a fully opened airbox with 128 mains, 40 pilots & DJ needles. Runs really well at all revs/throttle. Plugs are fine & mpg is around 60 (Imp Gal) - even thrashing around the Pyrenees I didn't get less than 55mpg IIRC. (But I do avoid continuous v high speed running on m/ways & such.) See more info here:

http://www.triumphrat.net/hinckley-classic-triples/205416-1998-tbs-dyno-results.html

I've no reason whatever to doubt the results of those running pods. (Not a lot different to my set up.)
 
#5 ·
The cool thing about the T3s is they respond well to either pods or the stock airbox, as long as some degree of individual adjustment and dyno testing with exhaust sniffer is performed. The setups on this web site are for a starting point. Jet sizes, needle position, carb sync, airbox holes, valve clearances, advance curves and silencers (at a minimum) all play a critical role in the way the motor will perform, and before digging into that process, be willing to ride it thru. As a strong advocate for pods, I've seen large variations in the results due to not completing the process with a dyno run to verify safe and efficient mixtures. I've also seen stock setups that did not run well, even when adjusted as per the factory shop manual recommendations. That said, the factory did their homework and came up with stock settings that work well in most circumstances, and meet emissions as well as rideability. But if horsepower, and torque move you, go for the pods! Anyway, one way or other, enjoy the ride! tommyturbo2
 
#6 ·
Well, just to calm folks down, I won't be cutting anything. Like a lot of other parts the air cleaners will go into a box. If this experiment fails, I can always put it back.

So, since nobody gagged at my initial guess of 120 mains and 40 pilots and one shim, I guess I will give that a try. Again it is just a starting point.
 
#9 ·
I'm a long way from being an expert, but my guess is that even 120s with a stock exhaust might be a touch rich. Personally, I'd try 3 steps up from stock on the main (that would be a 97.5 on a Mikuni, not sure what the progression is on your carbs), leave the pilot stock, and either shim the needle a bit more (2-3 shims) or get an adjustable one and start 1 notch richer than stock.

Merlyn
 
#10 ·
Bravo Merlyn! As an alternative to either set-up, for those who want to make air filter servicing easier, contact Blue Trophy. He's fabricated a setup that splits the airbox into a left and right side, which allows it to be removed and serviced without having to remove the carbs. tturbo2.
 
#11 · (Edited)
Merlyn, I've been contemplating pods on my Legend for a while but was hesitant because my bike has miks on it. But after reading your post I think I'm gonna be looking up a set UNI pods. I believe the elevation in Fargo is similar to Vegas so it should be pretty straight forward. Can't help but wonder if some of the people who encounter problems with pods have other underlying problems they are unaware of?
RM

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#12 ·
Unis should look interesting in there :: grin :: I'll look forward to pics!

I think underlying problems are part of the reasons for the bad rap pods get. I think improper mounting is a bigger reason, though.

If you seat the pods all the way back on the carb, the step in the rubbers seal off the air jets and it will run like crap. I've seen it happen more than once, and I think it's a very common problem with pod installs.

Merlyn
 
#18 ·
My bike is used and at some point it had the carbs swapped out for miks. One of the PO's must have seen what the khenins were going for on fleabay and swapped them out to make a quick buck. No matter, she runs great anyway.

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