Fuel fragrances for scented exhaust?

I came across this website the other day that sells "fuel fragrances" that are added to racing fuel to produce scented exhaust that help mask the nasty smell of burning fuel.  The scents you can buy include "Atomic Apple", "Burn Out Blueberry", "Rippin' Root Beer", and "Victory Vanilla"!  Though personally, I'd probably want to give my exhaust a minty smell, though it doesn't seem like they have that as an option.  Butterscotch would be pretty awesome too!

Some people find the idea of adding scent to your exhaust to be a "fruity" idea, but I think it's rather funny and I certainly wouldn't do it all the time.


But do these work with our little china girls?  I haven't tried it out, and I'm not sure anyone else has.  If you have any input, join the conversation at motorbicycling.com!

UPDATE: Pirate Cycles sells strawberry-scented oil that works in our 2-stroke engines!

"Velocity Stack" air filter mod

I don't think it's a true velocity stack, but it sure looks cool!  It's got to be better than the stock air filter/cover!  The fewer obstructions to the air intake, the better!  It can also be rotated to whatever angle you like, and I think this would go really well with the copper pasta tin fuel tank!

Modified KDX CDI

A normal CDI has a constant charging time, which means that it will run the engine but it will not lower its capacitance(charging time) to keep up with the speed of the engine.  This modified CDI setup allows for the capacitance to decrease when the RPM of the engine increases.  What does that mean?  Well it means faster uphill speed and an overall smoother ride!

DIY bike sidecar

This isn't specifically a motorized bicycle mod, but I think it's a worthwhile [and not often talked about] idea.  

This Instructables.com entry gives instructions to making your own bicycle sidecar!


I'm not sure how safe it would be to have another person in this car, but for areas with low traffic, it may not be a bad idea!  Even better, you could mount a cooler on the trailer and start your own mobile ice cream business!  What better way to pay off that 66cc engine than by using a little engineering to turn it into profit!


You may be wondering if this would legally disqualify your bike as a motorized bicycle: Well, this can depend on the laws in your area, but usually bikes with 3 wheels still qualify, which is what's excellent about this mod!  I'd love to see someone do this with a motorized bicycle!

Cheap homemade reed valve

For those of you who don't know what a reed valve is, I'll quote wikipedia:

Reed valves are commonly used in high-performance versions of the two-stroke engine, where they control the fuel-air mixture admitted to the cylinder. As the piston rises in the cylinder a vacuum is created in the crankcase beneath the piston. This vacuum opens the valve and admits the fuel-air mixture into the crankcase. As the piston descends, it raises the crankcase pressure causing the valve to close to retain the mixture and pressurize it for its eventual transfer through to the combustion chamber.

Pitchfork311 on motorbicycling.com took an $8 chainsaw reed valve and made it compatible with an HT engine! 

EDIT: Please, keep in mind that you must modify other parts of your engine(like trimming part of the piston skirt) before attempting anything like this.  Supposedly, you can't just slap a reed valve on a motor and call it done.

Read more about reed valves on bike engines!

Simple air cleaner mod promotes easier "breathing"

It's a similar idea to having a ram air system, only it involves simply shearing off a bit of the tubes off to allow air to more easily pass into the carb.  Neat and simple idea!

Homemade clutch lock

One of the most irritating aspect to building an MB is having things fall out due to vibration!  Fortunately, some parts, like the clutch lock, can be fabricated out of hardware store parts!