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    #2
    Sur-Ron headset

    Luna now offers a high end replacement headset kit from Cane Creek, it comes with a PVC pipe to make the installation a breeze.


    Click here to see the listing

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    See below for what makes up the Surron headset. With this info you can service headset, replace components and potentially switch to a different fork if you wanted to.

    The part numbers are for a HOPE headset and will work fine with the Sur-Ron.

    Click image for larger versionName:	head set.pngViews:	1Size:	222.2 KBID:	71588


    For the removal & installation, please watch this video

    Comment


      #3
      Tire and tube replacement.

      How to fix a flat?


      This is not a standard mountain bike so you will not be able to use your little plastic levers, you will need real MX style metal tires levers (also called tires spoon).

      Something like this is probably sufficient for the stock tires

      You will also need a MX tube to replace it, The stock one is on the thin side and if weight is not an issue for you you can opt for a heavy-duty thick tube (lie a Kenda Tuff tube or else). The size you will need is a TR-4 700/100-19 good for 2.5" to 2.75".



      Change your tire?

      The size is the same as the front and they are 70/100-19 tires. You may try to use a larger tire but you may have to shave some block or dish the wheel a little. There is simply not much space to work with.

      So far we've seen a few members or the Sur-ron Owners group on Facebook that changed the tires to something better and wider, here is the list:
      Bridgestone M-403 (direct fit)
      Shinko SR241 Series Trials Tire 3.50x19 (will probably rub so be prepared to align your wheel, remove the kickstand or shave the knobs)
      Pirelli Scorpion mx mid soft 32 70/100-19 (direct fit)


      Here are a couple comparison pics from BeenRydin on the Sur-Ron owners facebook group which may be useful to reference sizing
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      Comment


        #4
        RST fork replacement axle and axle nut?

        If your local bike shop can't order you a new axle from the RST distributor you can order them online, they seem to be harder to get in the USA. we found you this place that has them in stock if you are in need.

        Complete axle with the locking nut

        Alternative to the first link

        Just the locking nut

        Comment


          #5
          Upgrading/replacing Sur-Ron brake pads and disks


          The Sur-Ron uses 4 piston downhill type hydraulics brakes and 203mm disks.

          The caliper uses Shimano replacement pads, look for a pad for :Saint M810, Saint M820 or ZEE M640.. You can even use aftermarket pads like Kool Stop, you can also change the compound to metallic and such. This is an example of a compatible replacement.

          If you want to upgrade the complete braking system you can too, Shimano Zee or Saints, Magura MT5/MT7 or even Hopes. Just remember that the front brake is the right lever as most MTB brakes are the opposite,


          For the disks, the front uses MTB standard 6 bolt rotors so you can use any disk you like, you can go with a Shimano Icetech rotor or go with a floating rotor too. IF you plan on going over 203mm you will need a new caliper mount. But the rear has a different bolt pattern and standard mountain bike disk will not fit. You will need to use rear Sur-Ron disks.

          Comment


            #6

            Sur-Ron replacement connectors:

            Charger connector

            You would like to use your charger (at your own risks), the charger connector is a NLINKO LP-20C03PE-01-001

            You can purchase them at NLINKO through Amazon.


            Discharge connector

            They are RCproplus dc-6.

            https://www.amainhobbies.com/rcpropl...rod6p8/p298526

            Comment


              #7
              Sur-Ron Street legal mode

              Please click this link to see the video on how to change from full power to street legal and vice-versa.


              On the Light-Bee this is a (very) low power mode (like 8-10mph) on the Light-Bee X (LBX) it's a street legal mode (if that applies to your state/country) and it's locked to 25-30mph.

              Now here is the trick, If your bikes was bought before May 2019 then:

              Cutting this wire will limit both power AND speed depending on the model you have . In theory you could put a switch here when you go offroad but the idea is you simply cut the looped green/black wire.

              If your Bike came with the factory street/slow mode, just look for the green/black wire under the black sheath and crimp or solder both ends together (or twist them together if you can't wait!)


              If your bike was bought after May 2019 then: It's the opposite, cutting the green/black wire will make you bike fast again!

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              Comment


                #8
                Ebrakes: More Detail

                The ebrakes are a sensor that is installed by the brake lever via a screwset.

                When installing it is VERY easy to rip out the ebrakes, which is the cause of most 'DOA' issues or intermittent working issues. Try fully unplugging to troubleshoot.

                Below shows the sensor itself where it plugs into the lever, and the other side of it where it plugs into the white connector on the bike.
                The hex bolt that the sensor enters sets the depth, and the set screw keeps it fixed in position.

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                Here we can see a closeup of how the sensor actually goes through the bolt.

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                Side angle and a view of one of the sensors fully removed.

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                How to unplug the brake cut off sensor connector

                Open battery lid slide the breaker across to OFF and remove the battery.

                Remove the 2 screws that hold in the ignition and usb.

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                Gently remove ignition to access the wiring harness for the brake cut offs.
                Trace the wires from the front and rear brakes. These are the 2 wires marked with red arrows. Unplug them.

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                Gently remove the required brake cut off wiring and you are done.
                (Black arrow is pointing to the head light plug)

                Comment


                • deserthi
                  deserthi commented
                  Editing a comment
                  I unbolted the ignition but could not get it off. It simply would not come out. I feel like such a klutz!

                • paxtana
                  paxtana commented
                  Editing a comment
                  Typically on these types of connectors there is a tab that latches it into position, you may need to move the tab to unplug it.

                • ElectricMud
                  ElectricMud commented
                  Editing a comment
                  Can I just disconnect the two terminals and leave the cables attached to the brake levers? Is it necessary to take the wires completely off? Does it matter if the wire is removed from the brake lever since it would already be disconnected to the power source?

                #9


                Upgrading to riser bars

                Default stem clamp will hold 31.8mm bars
                If you need a riser handlebar we found that one online, so far a couple customers bought it and seemed happy with it. CLICK HERE
                To use a different diameter bar you would need to change the stem or use shims.

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                  #10
                  Adjusting the rear wheel and chain tension


                  You will need proper tools to get the job done properly:

                  1) 17mm socket and wrench
                  2) 2x 10mm open end wrench.
                  3) Measuring tape, ruler, micrometer or else.


                  Click image for larger version  Name:	IMG_2677.JPG Views:	1 Size:	1.80 MB ID:	74784


                  First step is to put the bike on a stool or a work bench, loosen up the rear axle, it's pretty tight so have someone holding the bike!

                  Next step is to loosen up the 2 axle adjusters (on on each sides)
                  To do so you just have to turn the locknut counterclockwise (lefty loosy) that should free up the bolt and the locknut

                  locknut is the one with the chrome 10mm wrench
                  The tensioner bolt is the one with the black wrench

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                  Now the important part is that you need to adjust the axle to get proper tension on the chain while keeping it straight.

                  There are notches on the frame near the axle so use them to get the wheel straight.
                  Work slowly by adjusting each side little by little till you get proper tension, what is proper tension.. about 1/2 ich to 3/4 inch slack
                  When you have proper chain tension check the alignment of the wheel,You can use a ruler to measure the distance between the rim to the frame or use your hawkeye like I do :)

                  Here you can see I pull on the chain to get to the zero mark and then pull the chain up to see if I'm between the safe slack range.
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                  How I center the wheel to the bike
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                  Once you have proper alignment and chain slack you must lock the tensioner in place, if you don't it will likely be all loose after your next ride.

                  Hold the bolt in place with the black wrench then turn the lock-nut clockwise with the chrome wrench till the nut to set to the frame and tight.

                  Recheck the chain tension again, pull hard on the chain to be sure if the axle is sitting on the tensioner. If you got more slack you will have to redo it again.

                  Click image for larger version  Name:	IMG_2683.JPG Views:	2 Size:	1.34 MB ID:	74788

                  Once it's locked on place it,s time to get that 17mm socket an wrench and firmly secure the axle, it's a large diameter axle so you can put a lot of force on it.

                  Comment


                    #11
                    Replacing the throttle

                    The stock throttle is a cable throttle like any little dirt bike or pit bike, it is compatible with Honda CF50 throttle and etc...

                    If you do not wish to use the stock Sur-Ron throttle, you can get one for cheap from Ebay or else (See link for an example)

                    To remove it
                    1. You will need to pull out the grip or cut it off from the tube.
                    2. Turn the cable adjuster clockwise all the way in.
                    3. Unscrew the 3 bolts holding the throttle, remove the tube and cable guide
                    4. fully remove the cable adjuster from the the throttle body.
                    5. Install the new throttle
                    6. adjust the throttle properly.
                    7. Install a new grip or the old one
                    8. If the new grip is loose you can use rubber glue and safety wire to lock it in place (see pic below)

                    Once done it should look like this:

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                    Comment


                      #12
                      Replacing/locking the grips

                      Stock grips are 7/8 inch grips (or 22.2mm) from the factory. Mine were already slipping after a wet ride so I had to do something.

                      Our friend Mark K told me about using safety wire to make sure they don't come out so I can say now that I tried it, Iwill never ride without them.

                      Here is a great video on how to replace your grips and how to lock them in place.




                      Oh and while you are at it get some grip donuts and say bye bye to thumb blister

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                      Comment


                        #13
                        Adjusting the front fork

                        The Sur-Ron uses a basic downhill mountain biking type of fork

                        One of the fork leg has the spring (can be a real metal coil or can be an air spring) Depending on the model: FastAce, RST Killah, DNM USD-8S.

                        If your fork is a an Air type you will have to buy a fork pump to add some air to it for you weight and to get proper sag, search on Youtube for setup sag on a air fork. If it's a spring type you will either have to deal with the stock spring rate or try to find a springs from another fork manufacturer (like Fox, Manitou and etc). Spring or Air both have their own pro and cons but both are effective!

                        The other fork leg is the damper, on any basic fork you will find a compression adjuster and a rebound adjuster.

                        Compression (Low speed): regulates the force that moves a fork or shock through its travel. Compression damping is achieved with fluid, usually oil. This oil circulates through a compression circuit, and by restricting its flow, the suspension can be made firmer and can even be almost locked out.

                        So basically the more you turn the knob the harder it will be to compress the fork. Ultimately you can use the compression knob to firm up the spring (ie: to prevent bottom out) You can dial it down when you need a super plush ride for comfort.

                        Rebound: Rebound damping regulates the speed at which your fork or shock recovers, or bounces back, from an impact and returns to its full travel.

                        So rebound is the opposite of the compression, Too slow and the fork wont have time to recover for the next hit and will start to pack up and eventually you will have no more travel :) Too fast and the fork will bounce you back and you will loose traction.

                        What is my ideal setting? well you will have to find out yourself, rider weight, speed, riding style and the terrain will all play a role. It’s important to remember that suspension is intended to maximize traction; it does this by keeping your rubber in contact with the ground.

                        Some say start in the middle or the adjustments while others will tell you to start from 0, either ways are good just need to take the time to setup your fork properly.

                        Comment


                          #14
                          Need to make a key copy?

                          Click on the pic to enlarge.

                          Ilco X121 DC3


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                            #15
                            Setting up the rear shock

                            The shock (either the DNM or the Fastace) like the front fork has a rebound adjustment and a compression adjustment. these work the same way as the front fork and need proper setup, please read the fork setup guide.

                            What differs from the fork is the spring pre-load adjustment and this is what we will cover here:


                            Your Sur-Ron light bee is probably set at the loosest setting possible so it's important to check the rear spring.

                            By this I don't mean to say to tighten down the spring a lot, too much pre-load will make the ride harsh and will require too much force to move the shock. If you are too heavy for the spring (just by sitting on it you get over 35% sag) or that you jumps cliffs for a living and bottom out on the stock spring then best would be to change the spring rate to get the proper sag and proper pre-load.

                            Lift the rear wheel up and sit the bike on a stool or a box. Grab the spring if you can move it or if you can turn the lock nut over the spring with your bare hand then it's too loose, But If you can rotate the spring and not the lock ring with your hand it's likely OK.


                            If you only need to tighten the lock-ring 1/2 turn or a full turn you can do the caveman technique and use a big flat-head screwdriver and hammer, be gentle you don't want to dent the lock ring. I personally used this technique as I only needed about 3/4 of a turn. Proper sag should be around 20% of the full travel, I weight about 170lbs with gear and I get good enough sag without much pre-load.



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                            If you need to apply more than just a turn then maybe it's best to remove the rear shock and use a locking ring spanner wrench.

                            Click on the pic to enlarge.

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                            Thanks Jonathan B for detailed instructions.

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