Dial a Jet

[2 strokes 4 life]

Well it does increase fule economy because it atomizes fule more than just the carb alone. Seems like a good mod to me.

[Eric K]

Originally Posted by 2 strokes 4 life

Well it does increase fule economy because it atomizes fule more than just the carb alone. Seems like a good mod to me.

What is your personal experience - how much did your fuel economy increase?

[GMP]

If you split the vents (like you should) and route two up top with some slack, rotating the carb is no problem with a stock tank. I trimmed my LTR case saver a few mm so the drain clears.

All bikes are a bit different. My stock '03 was a PIA to get right, my '07 runs perfectly and needs no more than air screw tweaks. '00 was somewhere in between. Its all about tolerances and environmental conditions and how they add up. The RBD mods take care of a lot of the tolerance issues.

From my experience you have to get the slide right or you will be chasing the rest of the jetting forever. Once the bike is set up decent you trailside changes should be minimal unless your specifically out working on jetting for extreme environmental changes.

[2 strokes 4 life]

I do not have one but a friend has a dualy set-up (2 in one carb) on his sled and it makes much better response. As for fule economy he got about 2 or 3 more MPG.

[webmaster]

As I said previously, the dial-a-jet has been around since the 70s or maybe earlier. The main role is to provide external adjustability for the main jet circuit; I always attributed mileage gains to having a proper mixture ratio - not any additional atomization provided. That's why my response to it was "why? the main jet is relatively easy to change on this bike..."

Agreeing with Glenn (that's usually so easy to do) - what I have seen watching threads here is that folks don't have any trouble dialing in "the main" - they have trouble with burbling off bottom and transition to mid etc. Getting the slide, needle, pilot, idle screw and air screw adjustment in the right starting point is key

And some might think they found a good combination - a slightly warmer or colder day will throw things off. - having one thing adjust slightly one way or another to compensate for something else (needle, pilot, idle screw setting, etc.) being slightly off can make "life difficult".

Frankly, if I were to spend $100 to get better fuel mileage - I would dial in the squish and compression by having the cylinder head mod'ed by RB so that the engine is running more efficiently.

As a sidenote - It looks like Ron dropped his price down to $165 for gasgas carb mods which includes return shipping - with Dick's racing charging $350 to bore the carb and install a dial-a-jet - looks like he can raise his prices...

jeff

[2 strokes 4 life]

Wait I see now why I got a PM.

This is right from the Thunder Products site
Dial-A-Jet IS NOT like a Power Jet. A Power Jet feeds raw liquid fuel, just like the other circuits, and works from 7/8 throttle and up. Dial-A-Jet feeds emulsified fuel for instant throttle response and works from just above idle to full throttle.

Dial-A-Jet feeds a fine consistent mist of emulsified fuel instead of raw liquid fuel like all other jetting circuits in your carb. Pre-atomized fuel weighs 10% of what raw liquid fuel weighs, therefore, it is very responsive to engine needs.

Dial-A-Jet gives you great throttle response. The emulsified fuel is delivered to the engine instantly and acts as an intermediate circuit until the heavy wet fuel from the other circuits catch up.

Now sorry it does not atomize but emulsified which still increases your fule economy.

Yes the RB is the way to go but why not add a Dial-a-jet to the RBD modded carb?