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Model Differences
| Of the three models that Monark put out during its brief history (Enduro, ISDT MX), there is some confusion concerning the MX, GS and GS Pro versions of their motocrossers. Having read every article I could find, pouring over shop manuals, talking to those who raced them, those who maintained them and many hours of discussion with Scott Wallenberg, I've come up with a short list of identifying characteristics that may help you identify what you have. After you read through the accompanying material and find that I'm wrong, please let me know. My only hope here is to present the most accurate information possible. |
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MX |
GS |
GS "Pro" |
Origin of GS "Pro" Parts
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| Head |
Standard |
Standard |
Milled |
Factory Installed |
| Hubs |
Sachs / Leilu |
Leleu |
Leleu |
Factory Installed |
| Ignition |
External Flywheel
Motoplat |
External Flywheel
Motoplat |
Internal Rotor
Motoplat |
Local Modification |
| Carburetor |
Screw Top Bing |
Two Screw Top Bing |
Two Screw Top Bing |
Factory Installed |
| Engine |
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Stuffed Cases |
Factory Installed |
| Fenders |
Steel |
Plastic |
Plastic |
Factory Installed |
| Inner Fenders |
Steel |
Plastic |
Plastic |
Factory Installed |
| Tank Color |
Darker Yellow |
LIghter Yellow |
Lighter Yellow |
Factory Installed |
| Transmission |
Standard 6 Speed |
Improved 6 Speed |
Improved 6 Speed |
Factory Installed |
| ID |
5B or 6B |
6B GS |
6B GS |
Factory Installed |
| Rear Sprocket |
Steel |
Alloy |
Alloy |
Factory Installed |
| ISDT 1 Head/Cylinder |
Undrilled |
Drilled |
Drilled |
Factory Installed |
| Cost |
$995 (In 1973) |
$1165 (In 1974) |
$1365 (In 1974) |
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1 The heads and cylinders of GS engines were drilled to allow the installation of a "lead seal" to prevent work on engines during ISDT events.
Notes:
- GS Models available in both 1973 and 1974.
- Each dealer had an option for 1-2 GS Pros for racing. In 1974 the were more available and could be ordered by anyone.
- 1100 Monarks Imported into the U.S. over 3 years. 10% or 110 were GS Pros. (GS Pro numbers are just an estimate. No known figures are available at this time).
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