Honda Spree and Elite 50 Forums

Wheelman-111 wrote:Greetings:

Johnniespeed, I haven't run a Spree yet, but the idea is that the Pilot circuit is TINY in the Spree carb. Its size is built-in, and depends upon high negative pressure - vacuum - in the intake tract to suck enough fuel up that tiny orifice. If that negative pressure is relieved, say, by a hole drilled in the airbox, you won't draw enough fuel to match the air. Even worse if you ditch the box for a pod. Unless you can precisely enlarge the Pilot to match the higher pressure (less vacuum), I agree that it's best to leave the box alone.

Wheelman-111 wrote:Greetings:

The flow-limiting factor isn't the bottomed of the fuel tank, lambda. That'd be the fixed size of the pilot circuit cast into the little Keihin PA carb body. A steady hand, super-fine gauge wire and a lot of luck would be required to enlarge it. Nobody I have read has succeeded. Mess it up and the carb is toast. Swapping carbs can be done.

Johnniespeed wrote:I love riding Spree's a lot, but to go fast I can jump on my Aero 125, my Elite 150 or my Elite 250. Long ago I gave up on trying to force a Spree to go fast and started buying scooters that go faster.
There is nothing you can do to a Spree to get it to ride as nice or as fast as the Big Elites,( I really do like Spree's ) . I don't want to discourage you from trying, but the short cut is very obvious.
You could lengthen the wheel base, add a stroker crank, convert to liquid cooled big bore kit, fabricate fuel injection, fabricate an over-range variator, add disc brakes, add actual forks with shocks, but why ??? You will end up with thousands of dollars invested and hundreds of hours of work, with most likely a substandard result.

codename47 wrote:all the circuits work to tune it, kind of pretty much. the size of the carb shouldnt, matter so much. the motor should be able to make use of it and no openning of the air box is going to overwhelm the motor. if its undersized compared to the carb, its just restricting it, but the carb if it was way big, would not be able to suck in the choke the amount of air needed to activate the, idle jet main jet.. (choke venturi)..

restricting the air is like popping a smaller carb that the size of the carb on it.

too small of a carb for too big of a motor, would be like turning the mixture screw down too far, and making it oversensitive.

the airbox isnt adding any pressure itcan reduce the amount of air, making it like a smaller carburetor, but not only that making the motor bigger. kinda or whatver, the motors still gonna suck but it makes the motor like bigger, and the carb like smaller and the air will flow through at a faster rate because the engine still needs the air that it requires, but it will be restricted, so it will flow at a higher rate, like the airhole in the mixture screw where it meters the air flow on the pilot jet circuit hole there, and too small, can make it oversensitive. ok i think that's enough analogys. i could make one about breathing thru a straw, and like if you where to like after doing this for 30 seconds used the same straw without takign a breath without useing it, used it to suck pop down and how that wouldnt be normal. someting like that. its still restricted, but nobody would drink pop normally that way.

I disagree... ...with this^^ dribble.
Especially the part in red.

patthesoundguy wrote:I have done the testing on an 84 spree with and without the air box with a k&n filter and all of the different jetting. GPS for speed verification and digital tachometer. You will not get any performance gains whatsoever if you remove the airbox and upjet. I had done a little cleaning of the intake ports exhaust port and had the MLM pipe installed. No gains whatsoever! A stock spree works best with the airbox installed with a properly oiled element.