Inside Alex Martin’s JGR Suzuki RMZ250

Alex Martin’s Factory JGR/Suzuki RMZ250

Alex Martin RMZ250 Full bike
Alex Martin’s JGR/Suzuki RMZ250

Alex Martin returns to the JGR/Suzuki Factory effort base out of North Carolina for 2020. He is racing in the west region 250 Supercross class and showing good results with the team. With a break in the west coast  schedule, Alex is riding outdoors to prepare for the Pro Motocross Season to begin in May. Mechanic  Lee McCollum sat down with us  to go over the secrets on Alex’s bike during San Diego Supercross.

The Front End

Alex Martin RMZ250 handlebars

Alex Martin runs Pro Taper Carmichael bend handlebars. They are in a neutral position, at least on that day they are. Lee explained to us that he will roll them back of forward a touch based on feel each weekend. Alex is a fan of the cross bar and doesn’t alter it from stock like some of the other factory riders do.

Alex Martin RMZ250 triple clamps

The clamps are made in house at JGR in North Carolina. This specific clamp was made all around Alex’s preferences. He is the only one on the team running this clamp. Lee didn’t want to give away  the offset or any other details on the clamp to Dirt Bike Magazine. Some secrets have to be kept secrets. Alex Martin RMZ250 bar clamps

The bar mounts are 30mm in height. The steering stem nut is actually supplied by Yoshimura. There really isn’t anything different about the nut itself other than the fact that they are coated different colors for the team. This one is black but in years past they have used red.

Alex Martin RMZ250 cables

The cables on Alex’s bike are supplied by Factory Suzuki in Japan.  The front brake line is supplied by Galfer and is braided. Behind the front number plate is also a transponder bracket that is made by ARC.

Alex Martin RMZ250 throttle tube

Full diamond Pro Taper grips are used on Alex’s bike. Alex is also running a Works Connection throttle tube on his RMZ2250. You can also see the GET map switch located next  to the throttle. Alex has a couple maps available to him while racing each weekend.

Alex Martin RMZ250 kill switch

On the left side of the handlebars you’ll see the kill switch and map switch for starts. He has a couple maps loaded into the bike for various start conditions. A trick addition to Alex’s kill switch is the housing wrapped around it. This creates a bumper around the switch so if he does bump it by accident the bike doesn’t turn off. It is a 3D printed cover made in house at JGR.

Alex Martin RMZ250 levers

ARC supplies the levers to Alex’s bike.  He uses a #26 clutch lever. The front brake lever is a standard brake lever with factory front brake master cylinder.

Alex Martin RMZ250 front brake

A factory caliper is mounted down at the front wheel. The hangar is made in house at JGR in North Carolina and is made specifically to fit the caliper. A Galfer floating front rotor is also used on the bike for added stopping power.

Alex Martin RMZ250 front rotor

The front rotor guard is a Factory Suzuki part from Japan.

Alex Martin RMZ250 suspension

The front suspension is A-kit Showa . He has been changing his settings a little bit lately. Because he rides at the JGR track sometimes, at his home in Florida, and on the weekends it causes him to change the stiffness frequently. In San Diego they went a little softer and felt is was a positive direction for Alex to go.

Alex Martin RMZ250 holeshot device

Works Connection supplies the holeshot device to the front forks. It is set at 145mm down the guard. That is a pretty standard depth on the supercross bikes.

Alex Marting RMZ250 front wheel

A factory front hub is attached to the gold front wheels. A Pirelli mid/hard tire is added to the wheel. The carcass is harder than the mid/soft so he prefers it in Supercross. Outdoors he will use the mid/soft. You can also see the carbon fiber ski added to the fork lugs. This ski helps in rutted situations where the fork lug could get hung  up a lot.  This ski helps the bottom for the forks stay protected and glide through the ruts a lot easier. The front axle is also steel.

Alex Martin RMZ250 radiators

The standard Suzuki radiators are braced so they aren’t bent or damaged during racing. Riders can even bend radiators with their knees because of how hard they squeeze during racing. The routing of the hoses hasn’t changed but the material is upgraded from stock.

Alex Martin RMZ250 skid plate

A carbon fiber skid plate is used on Alex’s RMZ250. The team has tried aluminum and plastic in the past. Different material skid plates can change the rigidity of the entire motorcycle so the team has decided to run a carbon fiber version. It is made in house at JGR.

Alex Martin RMZ250 engine mounts

The front engine mounts are Works Chassis Labs. The team is doing some testing for them and has only been using the front engine mounts for a couple weeks. The engine hangars on the side are made in house at JGR.

The Engine

Alex Martin RMZ250 Engine

The motor is put together at JGR in North Carolina. There is a lot of work with the head, cam profiles, the throttle body, and ECU to get the most out of Alex Martin’s RMZ250. The power has been tailored for Alex Martin in Supercross but he does run a different set up for outdoors. The bottom line is that it is a 250 and the team needs to get the most power out of their bikes as they can regardless of supercross or outdoors. Lee explained to us there is a lot of work involved even in the crank to get the most out of their 250. You can also see the spark plug holder on top of the head that JGR makes in house.

Alex Martin RMZ250 Ignition Cover

Hinson supplies the ignition cover and clutch cover for Alex’s bike. Alex is using a different shift pedal than stock.  The tip is a factory part from Suzuki Japan. The case saver wrapped around the front sprocket is made in house at JGR. The shifter is up a notch higher than normal because of Alex’s custom made footpegs that he uses.

Alex Martin RMZ250 clutch

Hinson also supplies the cover, basket, inner hub, pressure plate, and springs.

Alex Martin RMZ250 footpegs

A very unique piece to the puzzle is Alex’s foot pegs. They are elevated quite a bit over stock. These are to bring his feet and body up higher on the bike because of his small stature. They are titanium material and the pin is also. The mount itself is standard.

Alex Martin RMZ250 swing arm pivot

The swing arm pivot is titanium on Alex Martin’s RMZ250.

Alex Martin RMZ250 rear chain guide

The rear chain guide is a stock component. In prior years the team used a carbon chain guide that they would have to purchase. Because the guide was extremely expensive and didn’t last long they went back to stock.

Alex Martin RMZ250 air filter

The air filter is provided to the team by Maxima. The team does alter the air box a bit. Under the seat is where the data acquisition for the bike sits.

Alex Martin RMZ250 subframe

The sub frame is cut for Alex 10mm to lower the rear end. This helps from the seat hitting him in the butt through the whoops or other sections of the track.

Alex Martin RMZ250 seat

Alex is very picky about his seat. Some riders like them very worn in, while Alex prefers it to be on the stiff side and brand new. Lee will change out the seat/seat foam frequently to keep the stiff feeling going for Alex. Guts foam and seat cover are used on Alex’s bike.

Alex Martin RMZ250 sprockets

Pro Taper supplies the sprocket to Alex’s RMZ250. The chain does have a master link while some of the factory effort race bikes have a chain that is press fit.

Alex Martin RMZ250 rear axle

The rear wheel position is dependent on the linkage ratio and sprocket combination the team is using on Alex’s bike. You’ll notice at this current time the photo was taken that the rear wheel is pretty far back in placement. The chain adjuster bolts are titanium and are from Japan, so are the axle blocks.

Alex Martin RMZ250 rear tire

The rear tire is a 110 some of the times. This can be changed to a 120 depending on the track conditions and Alex’s requests on race day.

Alex Martin RMZ250 rear brake

The rear brake master cylinder is factory from Japan with a works cleavace. The cleavace can be  adjusted for pedal height. With Alex and the higher footpegs, that makes the  pedal also be higher.

Alex Martin RMZ250 brake pedal tip

The brake pedal tip on Alex’s bike is also higher to match the rest of the set up that JGR has made around the higher foot pegs. This is a standard brake pedal with works Suzuki tip which is titanium.

Rear portion of the motorcycle

Alex Martin RMZ250 brake line

A Galfer brake line is used for the rear brake system.

Alex Martin RMZ250 rear brake

Galfer rear rotor and the rear caliper holds a works piston inside of it. The piston is also drilled to keep the temperature down while racing. Galfer also provides the brake pads to JGR.

Alex Martin RMZ250 exhaust

Yoshimura exhaust is used front to back on Alex’s bike. This is the newest RS-12 system available.

Alex Martin RMZ250 exhaust

You’ll notice that the header of the exhaust has an extra chamber attached to it. This is specific to the engine package used on Alex’s bike. You can also see the 02 bung that is a sensor for the data acquisition for JGR.

Alex Martin RMZ250 pull rod

The pull rod is made in house at JGR in North Carolina. It has removable pills on it so they can change the length to the riders’ specifications.

Alex Martin rmz250 data port

At the center of the shroud just above the mounting point there is a data entry port. This is where the technicians will connect the motorcycle to a computer and get readings on what the bike is doing while running. Teams can make adjustments to the bike to get the most performance possible during race day.

Alex Martin RMZ250 seat bracket

Behind the plastics is a longer seat mount bracket. This is reinforced to help keep the seat in place This bracket is made in house at JGR.



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