Mx650 forks - Pocket Bike Forum - Mini Bikes
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post #1 of 19 (permalink) Old 04-28-2019 Thread Starter
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Mx650 forks

Has anyone fit another set of forks on? The stock ones really suck..
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post #2 of 19 (permalink) Old 04-29-2019
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you can adapt some down hill mt bike forks you need the mt bike disk and brake claper to make it work prepare to open your wallet

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post #3 of 19 (permalink) Old 04-29-2019
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Re: Mx650 forks

Seeings they are similar to a gas powered pocket dirtbike the forks could be a better upgrade seeings both have a 10mm steering stem bolt.......

The MX500/650 front forks closely emulate the Oldschool Rupp minibikes and the Kawasaki M75 minibike with subtle differences too...Finding a really good set isn't cheap though...

PW50 front forks are a good consideration too..

Good Luck

Last edited by CAM2; 04-29-2019 at 01:36 PM.
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post #4 of 19 (permalink) Old 04-30-2019 Thread Starter
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Any clue where to shop for them?...ones I'm finding on Amazon are all the bigger hollow stem bolt like a traditional motorcycle
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post #5 of 19 (permalink) Old 05-01-2019
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Re: Mx650 forks

Quote:
Originally Posted by FORCE View Post
Any clue where to shop for them?...ones I'm finding on Amazon are all the bigger hollow stem bolt like a traditional motorcycle
Vintage minibike classifieds and ebay..

On the ones with the hollow stem bolt you can unscrew the stem bolt and make an adapter to adapt basically any set of forks to fit any type frame...

Theres guys on the oldschool minibike forums cross breeding them with USD forks from pitbikes..........

https://www.popscreen.com/prod/MTgxM...-Old-Mini-Bike

These are from a Rupp



Kawasaki front forks....




If you go with the pocketdirtbike front forks I suggest buying an extra set of upper and lower fork clamps and doubling up the upper and lower fork clamps for extra strength for that heavier e-bike...

Last edited by CAM2; 05-01-2019 at 12:50 PM.
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post #6 of 19 (permalink) Old 08-22-2019
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Re: Mx650 forks

Just modded my sons suspension...........heres what I did:

An XR50 stock rear shock lines up and bolts right on with the stock hardware after pushing out the bushings in each "eye" (end) of the shock and replacing with new 1/4 x 5/8 x 3/4 bushings from ACE hardware ($2.99 ea). This raises the rear about 2" and gives a much softer/smoother ride with more travel. I had one laying around from other builds Ive done but the stockers are cheap on ebay (or any other pitbike shock).


For the forks.......

Theres a hole in the bottom of the forks where you can put a VERY LONG allen head tool (I had to make one using a hex apex and welding to a long metal rod with a nut welded on the other end) Remove these 2 bolts and the 2 bolts on top of the forks to disassemble. The white nylon bushing that keeps the inner fork tube stable can be compressed using small screwdrivers to pry it out after you pull the fork tubes out. Replace the bolt you just removed with a longer bolt (length depends on how much longer you want it to be/how long your new springs are) I had to make my own bolt as my local stores didnt have anything long enough in the correct thread. (I simply cut a bolt in half and welded in a metal rod to make it longer) You will find a rubber tube inside the spring in the forks when you disassemble. You dont need it. I cut this (1/4" length) and put it under the head of the new bolt to keep the bolt from slamming on the rebound of the fork. (thats the banging noise you hear on your stock forks. Older dirtbikes with spring forks used a rebound spring in this place....you could do that too. Make sure to account for this added length when choosing/building a new bolt) I cleaned/greased up everything and then reassembled using a longer spring I got from ACE. I dont know what the stock spring rate is but I bought the closest thing I could find in the same diameter/spring rate & length I wanted. ($2.99 ea) Put it all back together and you end up with the forks balancing out the rear end for ride height. The new seat height is 27". (Not sure what stock was) This made the bike waaaaay more fun. Even just riding around in the grass, you dont feel any of the little bumps etc..... With the added leverage, stoppies become easy. Super cheap mod!!

I also had a KX60 rear brake lever laying around so I fabbed up a bracket and cable to add a rear foot brake for it. Welded on some metal to widen the footpegs and sharpened them up. Hit me up if you have questions.
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post #7 of 19 (permalink) Old 08-23-2019
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Re: Mx650 forks

Good job! There's a whole lotta stuff you can do with a welder.
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post #8 of 19 (permalink) Old 12-25-2019
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Re: Mx650 forks

Where could one find a new white nylon bushing for the forks? Ours broke on one fork and is now jammed. Canít find specs for a replacement.
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post #9 of 19 (permalink) Old 12-25-2019
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they dont sell individual fork parts for the 650 unless someone is parting them out you should try and sorce some used forks for parts or contact razor for a new pair.

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https://youtu.be/rylbFnTgFI8

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Re: Mx650 forks

Quote:
Originally Posted by hubbyracing View Post
Just modded my sons suspension...........heres what I did:

An XR50 stock rear shock lines up and bolts right on with the stock hardware after pushing out the bushings in each "eye" (end) of the shock and replacing with new 1/4 x 5/8 x 3/4 bushings from ACE hardware ($2.99 ea). This raises the rear about 2" and gives a much softer/smoother ride with more travel. I had one laying around from other builds Ive done but the stockers are cheap on ebay (or any other pitbike shock).


For the forks.......

Theres a hole in the bottom of the forks where you can put a VERY LONG allen head tool (I had to make one using a hex apex and welding to a long metal rod with a nut welded on the other end) Remove these 2 bolts and the 2 bolts on top of the forks to disassemble. The white nylon bushing that keeps the inner fork tube stable can be compressed using small screwdrivers to pry it out after you pull the fork tubes out. Replace the bolt you just removed with a longer bolt (length depends on how much longer you want it to be/how long your new springs are) I had to make my own bolt as my local stores didnt have anything long enough in the correct thread. (I simply cut a bolt in half and welded in a metal rod to make it longer) You will find a rubber tube inside the spring in the forks when you disassemble. You dont need it. I cut this (1/4" length) and put it under the head of the new bolt to keep the bolt from slamming on the rebound of the fork. (thats the banging noise you hear on your stock forks. Older dirtbikes with spring forks used a rebound spring in this place....you could do that too. Make sure to account for this added length when choosing/building a new bolt) I cleaned/greased up everything and then reassembled using a longer spring I got from ACE. I dont know what the stock spring rate is but I bought the closest thing I could find in the same diameter/spring rate & length I wanted. ($2.99 ea) Put it all back together and you end up with the forks balancing out the rear end for ride height. The new seat height is 27". (Not sure what stock was) This made the bike waaaaay more fun. Even just riding around in the grass, you dont feel any of the little bumps etc..... With the added leverage, stoppies become easy. Super cheap mod!!

I also had a KX60 rear brake lever laying around so I fabbed up a bracket and cable to add a rear foot brake for it. Welded on some metal to widen the footpegs and sharpened them up. Hit me up if you have questions.

Could anyone please supply a link to any better spring just like how HUBBYRACING was able to obtain? Or any other better recommendations to make the MX650 perform better? Or any other better fork that directly bolts in???
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this very exspeisve mod where they use down hill mountain bike throw axial air forks with a mountain bike throw axial hub laced into a BMX double wall rim then you can use the mountain bike disk brakes a BMX goos neck and low profile BMX bars

you have to buy the forks new once the head tube has been cut to fit a mountain bike the head tube will be to short for a MX 650

dont even try to use a cross country fork it will snap you have to use ones rated for down hill mt bikeing

bearings cup sizes shims spacers and all of that fun stuff depends on the forks be prepared for lots of trial and error sence all mountain bike frames are difrent its trial and error on bikes as well

its not worth it IMO ($$$ to $$$$) unless you have down hill MT bike parts laying around...

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Last edited by MrKitty; 01-17-2020 at 12:55 PM.
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Re: Mx650 forks

Thanks, but not an option for me.



Could anyone please supply a link to any better spring just like how HUBBYRACING was able to obtain? Or any other better recommendations to make the MX650 perform better? Or any other better fork that directly bolts in???
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i will stop by the ace hardware today and see if i can find the springs they used

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this is what they have
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Re: Mx650 forks

I ended up 3D printing some 3 inch spacers in PLA. I printed with 100% fill so they are solid. I purchased M8-1.25 x 200mm bolts and put the spacers in. Now my forks at least are as high as the rear end. I am going to throw on the new forks this weekend and try it out. The springs may still be an issue. If so I will take them apart again and find some better springs.

I just wanted something to ride around with my 10 year old. I added a 1800 watt motor and 48v battery. It gets up to around 25 with me on it. I weigh 240.

A few photos are attached.
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Did you have to make a long Allen head tool like hubbyracing described to get to the springs? Or did you figure something else out?

Please let us know how this turns out!
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Re: Mx650 forks

To remove the tubes, I just used an 18 inch bit extension holder from amazon. I also got a set of magnetic bits at the same time. It worked great. (Links below)

I took it out for a test spin and it made a pretty big difference. No issues at all and it seems pretty sturdy.

Instead of taking my existing fork apart, I ordered a SX500 Front Fork thinking it was an exact fit. I was wrong, but with another 3d printed spacer, it worked out perfectly and with new springs in the tube and a rubber bushing on the large bolt, I am getting a much better ride without bottoming out over bumps.

With the internal 3d printed bushing above and the 3d printed spacer, I am about 4 inches taller than stock.


https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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Thx for the reply and the details. Super helpful. I have a few bikes (sx500, mx500 and mx350) for the kids. The mx500 needs new batteries and is in rough shape. Think I will clean it up, new batteries, upgrade the suspension and drivetrain so I can ride it around with the kids. Then they will have a bike to grow into as well.

Ok I’m lying I am doing it for me. Lol
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