Not sure if anyone else is aware of this but looks like it could be a must have for me. No more trying to find a small enough screwdriver for my fat hands to fit under the carb

"The Maxmix Idle Mixture Thumbscrew for the RoadStar allows you to adjust the pilot mixture circuit on the fly. Handy for fine tuning or for changes in altitude.

The Idle Mixture Screw is the most common adjustment, needed on your motorcycle's carburetor.

Adjusting this screw properly, can compensate for changes in altitude, weather, temperature etc.

Proper adjustment, to meet changing conditions can drastically improve drivability and performance, as well as reducing gas consumption and wear and tear on your motor.

Imagine being able to adjust your idle mixture on the fly - without a screw driver. Well now you can with the NEW Maxmix idle Mixture Thumbscrews!!

I think it retails for about $15.00

Post edited by: JJsNet, at: 2006/10/02 08:18 <br><br>Post edited by: JJsNet, at: 2006/10/02 08:19

A &quot;heads up&quot; on the MaxAir Thumbscrew .... the threads on this screw are coarser than the standard Mikuni -- about a two to one ratio. For example, if a setting of two turns out would be appropriate for the standard thumbscrew, it would only be one turn out for the MaxAir. A friend of mine bought the MaxAir for some of the same reasons you stated but he wound up going back to the standard thumbscrew because it was easier to adjust and easier to maintain the adjustment. I'm not trying to discourage you but just something else to think about!

Just thought about what I was saying and it's wrong. Threads are the same! Taper of the needle is different and that's where the two to one come in!

Sorry!<br><br>Post edited by: pday, at: 2006/10/02 10:24

How would it fit with different threads? If the threads were not identical, I wouldn't try it in my carb. I am considering soldering something to my pms screw so it can be adjusted by hand. There might be something about doing this in the tech tip section.

I had a brain f*** when composing my reply. Tried to correct it with an edit but was too lazy to go back and change a bunch! Threads are clearly the same but when you open the MaxAir screw one turn it's the equivalent of opening the Mikuni screw two full turns or at least that's what I've read and been told. Seems the needle on the MaxAir doesn't have quite as gradual a taper as the Mikuni.

On your other point... I bought a spare Mikuni thumbscrew, mounted it in a pin vise which protected both the threads and the business end of the screw, and drilled it out with a 1/8 inch cabide drill bit. (Had to use a carbide bit because the screwdriver slot in the top of the thumbscrew would cause a regular bit to wander.) There's not a lot of brass in the top of the screw so you have to be really careful when drilling. Then I JB Welded a small length of .1 inch aluminum welding rod into the hole using the drill press as a clamp to hold it perfectly vertical. Mounted a small length of 1/4 &quot; knurled rod on the end of the rod to make it easier to turn. Seems to be working ok so far.

Okay. I understand that it is the taper of the needle that is different. I like your Idea of drilling and securing (JB weld, or if using brass rod, brazing) a rod with a knurled knob. I plan on porting my manifold this winter and will give your Idea a try. Thank you for your input.