JBOT Is bored so I'm back to troll you Wrote:
> I wonder if you could use some of the tech that's
> used with the dial a jet stuff.
> Have you seen their setup?
I did look at the dial-a-jet. Problem 1 is that it costs about as much as a whole fancy carb for a moped.
They do it weird, too. They tap the float bowl same as I do, but instead of replacing the jet, they pipe the gas into the venturi. I don't know exactly how it all works, and why it isn't just rich as crap with two fuel sources... They advertise that it can be installed without disassembling the carb.
They also say that they have five settings. I don't know if there is a way to get more variation out of it or not, but five settings, while an improvement over just jets, seems a bit limited for an add-on that costs $80. The mod I've presented costs under $20 and gives you infinite control.
I SHOULD asterisk here and point out that the $20 price tag is using that needle valve from Traaxas. The needle valve I have is more expensive and comes from OS Engines. The ONLY reason I have it is because my dad had a scrap one lying around. I do think the Traaxas one will work just as well, but I can't guarantee it. I plan to order one and install it on my brother's bike in the next month and then I can report back. Ponch got one and said he'd post pictures, so we'll get some good info there as well.
R/C engine instructions tell you to open the needle valve about 3-4 turns for starting, throttle up to WOT, then close the valve 1/4 turn at a time until you peak RPM. This is the ideal mix. Once you pass it, the engine will slow again, and you'll be leaning out. I recommend finding your peak, then opening a little to the rich side as a cushion.
On my Bravo, with a completely stock 50cc engine, a bored out 13mm carb, and a basically stock exhaust, at 40 degrees F, my ideal setting was somewhere around 2.5 turns open. Keep track of these settings, and set the mix while running on the center stand. Once you set it, you should be able to just adjust each time you want to, and not start at the beginning.
@ Charles Cole
Picked up tygon tubing today, hope to install a little later tonight. :)