does anyone have problem with gearing?

[spyderrider]

Originally Posted by Spyderman

Great!

Sounds like the answer to me 400 rpm is certainly substantial, I'll email and ask for the spreadsheet:

30 tooth:
Well Spyder Owners....
MMG is proud to announce the FIRST AND ONLY
30 tooth Billet Aluminum Front Sprocket
Not only is this sprocket lighter, it reduces you 400 RPM's and increases gas mileage!!!
CNC machined from 6061 Aluminum
This is a direct replacement for the factory sprocket and still uses the stock drive belt!!!

29 tooth:
Well Spyder Owners....
MMG is proud to announce the FIRST AND ONLY
29 tooth Billet Aluminum Front Sprocket

Not only is this sprocket lighter, it reduces you RPM's and increases gas mileage!!!
CNC machined from 6061 Aluminum
This is a direct replacement for the factory sprocket and still uses the stock drive belt!!!

Microsoft Office Excel Worksheet is available with the comparison between stock 28t and MMG29t
E-mail for details

I bought one of MMG sprocket 29 tooth last summer and I didn't have to replace the belt. Just loosen the rear wheel and move it forward to allow for slack. The sprocket was very easy to remove and extremely easy to install the new one. I figure I have close to 8,000 miles using it and it does drop the rpms about 400. Someone said that using this will make me slower on the take off and it does. Instead of doing the 1/4 mile in 10 secs (I'm just picking a number I don't know for sure) it takes me 11 secs. It has improved my gas mileage enough that it is noticable on a trip. I can probably drive and extra 30 minutes before needing to gas up. If you want to go faster on the start then this isn't for you but if you want lower rpms in the higher gears and better gas mileage then this works for me.

[Spyderman]

Originally Posted by spyderrider

I bought one of MMG sprocket 29 tooth last summer and I didn't have to replace the belt. Just loosen the rear wheel and move it forward to allow for slack. The sprocket was very easy to remove and extremely easy to install the new one. I figure I have close to 8,000 miles using it and it does drop the rpms about 400. Someone said that using this will make me slower on the take off and it does. Instead of doing the 1/4 mile in 10 secs (I'm just picking a number I don't know for sure) it takes me 11 secs. It has improved my gas mileage enough that it is noticeable on a trip. I can probably drive and extra 30 minutes before needing to gas up. If you want to go faster on the start then this isn't for you but if you want lower rpms in the higher gears and better gas mileage then this works for me.

Excellent, from an engineering standpoint this make perfect sense.

I'm wondering if they were able to lower the cruising RPM's via sprocket changes on the the RT since they upped the compression/engine torque.

[BacknBlack]

"Hold back," ... "too fast," wuh? What's the problem with your gearing? Are you speaking of an SM5 or SE5?

[jake318]

The reason the Spyder is running such High RPMs is becuse the Aprilla RSV1000 engine from which the Spyders engine originated was a 6 speed tranny . Rotax took the 6 sped and made a 5 speed with a reverse. The Rotax engine is bulletproof so dont worry about the RPM and being the Spyder isnt very stable over 65MPH you dont want higher gearing anyway

[zeebill]

Needless to say in any vehicle reducing RPM's helps save gas. But then again so does major or minor mapping and compression changes. They changed compression to give more torgue for their touring packages and completely ignored the fuel mileage and the cost of higher octane fuels that may or may not be required. Seems like they are marching to their own drum and making changes they don't have to live with and ignoring the changes that would cost them more money and take time to work out. I will repeat I drove a full bodied racecar with a Rotax engine at 143 MPH down the straightaway with more frontal area and weight that approached getting 35 MPG. If that can be done then getting a 900 lb three wheeler into the at least same range MPG should be more than possible.

I have long wondered just how much of the trike is shared by the Can Am 4 wheelers and if that money saving may be the limiting factor here at times. Surely a 60 MPH hour 4 wheeler is not influencing what is used on a 100+ MPH trike I hope! Bill

[Bob Denman]

MMG?? Does anybody have a website address for them?

[Glenndolph]

It has been my experience with Rotax that they are designed to rev higher... not like the lumpa lumpa of the hundreds of dollars brand...

[Glenndolph]

Originally Posted by Bob Denman

MMG?? Does anybody have a website address for them?

Free Flash Intro Pages By Wyoming Webdesign
I found a photo of the sproket and their name was engraved on it, so google found them...Glenn

[Bob Denman]

Thanks! But if the MIssus ever figures out that I've found a way to "TINKER" with this thing...