Joined: 19 Jan 2005
My Stella has developed a chatter and loss of power at low RPMs in third and fourth gear. If I rev it out a bit it goes away, but the noise has been getting progressively worse over the past couple weeks. It kind of reminds me of a clutch going bad in a manual transmission car. Is this a possibility? I have about 4500 miles of very hard riding on it. What do you think?
Not really related to your problem...
but i just wanted to thank you for the pipe. We bolted it on and threw a 105 in the stack and it seems to be running great!!!
Come on dude, IT'S NOT THAT LOUD!!!
Joined: 19 Jan 2005
Location: Best Saint Paul
The colder air gets, the denser it is. If you take a balloon and fill it with air and move from a very warm room to a very cold room, you can see that the balloon shrinks. If you were to have a balloon of the same volume in the cold room, it'd actually have MORE air in it.
So your scooter is breathing in the same sized 'breaths', but it's getting more air- meaning you're getting a more volatile reaction in the cylinder. Same pricinple as a turbo or a supercharger, which use compression to force extra air into the cylinder.
Cold weather is a very low-rent turbo.
_________________ I like scooters!
Yours is the neatest!
So why isn't my scooter so much faster in the winter? The idea is right on but an engine doesn't need more air or more gas, but will run best at the exact optimal fuel to air ratio. Some people will say, an engine will run best when it's lean. This is not true. I think it comes from the fact that most engines are set up so they run normally on the rich side of that magic perfect ratio and when they encounter a weather condition that has a higher oxygen density (i.e. cool and dry. Don't discount dry. Water takes up a lot of space, relatively, too) the engine runs better because it's closer to it's optimal ratio. One could set this fuel air mixture closer to optimal in the other parts of the year but then if they didn't adjust for cooler drier air they could be in trouble if say, they were driving out by stillwater in the twisty up and down stretches of road and left the throttle closed and clutch pulled in for just a hair bit too long. It's much safer to be on the slightly rich side for year round adjustment free riding and for the aide of general cooling properties of the fuel mixture. Fuel injection in modern cars takes care of all this for you with oxygen sensors. I've read about it racing that they want to deliver as much fuel as possible with out being overly rich. But I think this just comes from the balance from the opposite point of view. Personally,with scooters, I think it helps a tiny bit by reducing misfires from leaning the ever so slightly rich mix and the cooler air in your face makes you feel like you're going faster, rather than improving combustion on each stroke. All you CWC guys should clock your top speeds and zero to 60 km/h time using a GPS this winter and see. Remember to dress the same in your summer test run and when you do it in the winter to reduce the need for drag correction. don't gain any weight at the holidaze either.
but then if they didn't adjust for cooler drier air they could be in trouble if say, they were driving out by stillwater in the twisty up and down stretches of road and left the throttle closed and clutch pulled in for just a hair bit too long.
Don't know what the hell you're talking about there!
-++-you can't spell jackass with out JKSC-++-
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