Pod jetting suggestions requested - Triumph Forum: Triumph Rat Motorcycle Forums
Hinckley Classic Triples 885cc Classic Styled T3's: Legend, Thunderbird, Thunderbird Sport & Adventurer.

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post #1 of 19 (permalink) Old 10-29-2012, 02:42 PM Thread Starter
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Pod jetting suggestions requested

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%20ca...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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post #2 of 19 (permalink) Old 10-29-2012, 03:10 PM
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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.

Cheers,Denny
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post #3 of 19 (permalink) Old 10-29-2012, 03:12 PM
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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.
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post #4 of 19 (permalink) Old 10-29-2012, 04:22 PM
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Quote:
Originally Posted by Greaser View Post
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.
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-c...o-results.html

I've no reason whatever to doubt the results of those running pods. (Not a lot different to my set up.)


98 Tbird tank/seat, Sprint fairing, ZX7R forks+Racetech Gold Valves, 08 ZX6R shock, short sw/arm, Alcon 6-pots, Ignitech+TPS, T'bike 3-1+Beowulf can, airbox/jet mods, tubeless wheel mod, lots :) per mile, 55mpg ave(imp)
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post #5 of 19 (permalink) Old 10-29-2012, 09:32 PM
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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

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post #6 of 19 (permalink) Old 10-30-2012, 12:07 AM Thread Starter
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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.
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post #7 of 19 (permalink) Old 10-30-2012, 12:16 AM
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Quote:
Originally Posted by Greaser View Post
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.
Great advice
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post #8 of 19 (permalink) Old 10-30-2012, 03:00 AM
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Quote:
Originally Posted by greaser
Originally Posted by Greaser
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.
Quote:
Originally Posted by Peterh View Post
Great advice
Is it? Really?

I just saw a Thunderbird today with pods (on Mikunis, no less) that runs better than it did with the stock airbox. Mine.

If you do the install and re-jetting right, there's absolutely NO reason a bike with pods can't run just as well as a stock one. That airbox ain't magic.

I'm currently less than halfway done with my planned modifications to Belle, and she runs like a scalded dog - 70 to 100+ miles on an average day, 5 days a week, plus recreational rides on the weekends. Over 10,000 miles in the last 4 months, well over half with the pods. The ONLY real problems I have had were a busted coil and worn out o-rings/float valves in the carbs.

That's without a valve adjustment, carb synch, dyno time, CDI fiddling or priestly blessing. Not saying those things aren't necessary - they are all on my to do ASAP list - but I haven't gotten to them yet, and Belle runs great.

Anyone that wants to see a Thunderbird run well with pods is more than welcome to look me up next time they are in Las Vegas - we can go for a ride and when we get back I'll buy you a beer!

Merlyn
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post #9 of 19 (permalink) Old 10-30-2012, 03:08 AM
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Quote:
Originally Posted by PaulBx View Post
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%20ca...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?
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
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post #10 of 19 (permalink) Old 10-30-2012, 06:23 AM
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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.

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