Im trying to remove my JM250 Chain does anyone know what the easy way to remove these chains? im going to replace stock chain to another one and i also wanted to know if anyone knows how many links it has stock or what the length would be.

I believe its a 428-XXX just wanting to know what the other 3 #s are?

Thanks in Advance

It's easy, just remove the master link! Spin the rear tires around til you see the Master link. Once you find the link take pliers and pop off the link clip and pull the link apart. You most likely will need to remove links to make the new chain the same size which needs to be done with a special link remover tool!

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ok i tried it yesterday but wouldnt budge ill give it a try again today. I found out i to have a 14 tooth in the front so yesterday i ordered a 12 tooth online but i had a tough time finding one cause there from such a old application honda 70-80 sprockets it is a JTF 259,12 Ill let you know the outcome to see how much more low end torque it gives me.

do i need those pliers that will open the lock up to remove it?

never mind i got it. Thanks

Yes let me know how the 12 tooth works, and do they have 13 tooth also? I may want to go to 13! I'm just guessing the 12 may be too low but will be interesting to see. Will be much better for climbing which mine at 14 is not too great at!

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they have 13 tooth for sure much more easier to get a hold of. Well i want to go with 12 just beacuse there is a lot of good hills in TX and soft soft sand and its kind of difficult for the 250. Have you heard of anyone putting paddles on these Chinese ATV. Im wondering how good they would do after the 12 tooth that i get this week.

I got the 13 tooth front sprocket - didn't like it. It was physically too small. When the chain went around it - the links of the chain cut into the shoulder on the gear. It is so small, it seemed like the chain didn't really want to follow around the gear ("O" ring chain). I can't imagine what the 12 tooth gear will be like.
You don't need a "Special" tool to cut the length of a chain; just a bench grinder and a good (right sized) round punch. Be aware of the BIG end and SMALL end of the links. Just grind the head off the rivet (where you want the chain cut) Place the ground off rivet over a 3/4" socket and drive the rivet out of the chain and into the socket with the round punch and a hammer. Easy as pie (unless you get your finger instead of the punch - owwww).
The right way to lower the gear ratio is with a 46, 48 or 50 tooth rear gear. With the 12 or 13 tooth front gear - it is just waiting for something to break - why do you think that the 12 and 13 tooth front gears are soo hard to find; nobody uses them.

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While in the USAF I worked on Jet Engines for C-130's (In left Pic a C130 is Air Unloading an Army Tank) and B-52's (In Right Pic of B52 that's a School Bus in Lower Right)

The 13 tooth is easy to find but 12 tooth was kind of difficult but i found it. I just want a little more low end not to much. Plus that is the easiest to get to the rear one seems to be more parts that need to take off and eventually i want to go to 46 or 48 in the back and maybe leave the 12 in the front but ill have to see. Why do you say 12 tooth is just wating to break? Is it that the motor cant handle it??

It's mainly the small radius that the chain has to bend itself around and the few number of teeth that are left to "pull" the power thru. You will see when you go to actually mount the new gear what I mean. Don't cut the new chain to fit the 12 tooth gear. Cut the old chain to fit the 12 tooth, to test it out. The 13 or 14 tooth gear will require a longer chain. The gear ratios will be: 40/14=2.86; 40/13=3.08; 40/12=3.33 46/14=3.28; 46/13=3.53 50/14=3.57
What came stock on the quad was 40/17=2.35 or 40/15=2.67 It all depends upon the drivers weight. I go about 230 pounds and like the 50/14=3.57 gear ratio. My daughter goes about 130 pounds and the 46/14=3.28 seems to be fine for her.
It also depends upon the terrain that you will be riding in: Hills = lower gear ratios with more torque. Flat land = higher gear ratio with more "top end" speed.
If you start out with a lower gear ratio such as 50/14=3.57, you start out with the "longest" chain and as you play with higher gear ratios such as 48 or 46/14; you only need to cut out a couple of links of the chain which is easy to do. If you go in the opposite direction; you will need to find that "undiscovered" chain stretcher OR just keep buying new chains to fit each new set of test gears.
Ask outofline what he thinks; I think that he has tried a couple of different gear setups.

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While in the USAF I worked on Jet Engines for C-130's (In left Pic a C130 is Air Unloading an Army Tank) and B-52's (In Right Pic of B52 that's a School Bus in Lower Right)

Well i had a 14/42 stock and i do a lot of hill climbing cause there is a lot of soft dirt here in TX. I mounted it yesterday so to late on going to other gears before i cut the chain. Check out the pics i posted last night. I didnt have to really mess up the chain the pins i just punched out and i probably can put them back if i want to make longer but not sure. I did notice that the Jet pulled fine but Does the chain have to have an even number of links. I had a 132 and now its 113 but if i let go of gas when running the chain seems to whip and make strange noise but if i press the clutch it stops. Not sure if i need to remove one more link??????

balanis03, have you had a chance to test out the new 12 tooth gear? Just wondering if I would like a 13 on mine!

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Yeah outofline, i did take it out about 2 or 3 weeks ago to the same spot i always go. Let me tell you i did get a bit of lower torque that i wanted and i did like it. In the rocky terrain this thing can climb some mighty tough and steep hills. I went on this steep steep hill and thought i was going to flip cause it had a lot of power. But then i took it to the sandy terrain and it did better than before and i got higher on the hill than i did with the other sprocket but im still debating weather to buy paddles for his Chinese bike? but it really gives more power. Im going to ask a buddy to check the bike over and see if he can tune it up better since he knows more than i do. Im also looking for a 30mm Mukuni carb to add to get some more horsepower so that it opens up the engine.

I have ridden a 150 and a 200 with paddles at Pismo Dunes. 150 struggled a little. 200 had no problems. Both of these were '06 models. 250 should be fine with your lower gearing. Im running 15/40 on my '07 250. Stock was 17/40.

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07 Jetmoto 250 Sport
07 90cc Mini Ute
06 Jetmoto 200 Enduro
06 Jetmoto 200
06 Jetmoto 150
06 Jetmoto 125
04 Yamoto 150
01 KTM 400 EXC
92 WR 250
91 CR 250
88 YZ 80
85 CR 500
83 XL 600
82 XR 200
79 XR 75
79 Odyssey
73 Bultaco 360
71 Rickman Montessa 250
70 Rupp Enduro
69 Honda 50

Hey MWQ, good to hear from you. I have been asking around this site to see if anyone has put paddles for these but no response. Currently i have a 12/42 and it does pretty good i think but ive never taken the bike out to red sands. Thats what the place is called here. Are the tire that come stock mainly for rocky terrain?

Have you called Raceway or Jetmoto and asked? I know they have some for the 8" wheels. Should have some for the 250's

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07 Jetmoto 250 Sport
07 90cc Mini Ute
06 Jetmoto 200 Enduro
06 Jetmoto 200
06 Jetmoto 150
06 Jetmoto 125
04 Yamoto 150
01 KTM 400 EXC
92 WR 250
91 CR 250
88 YZ 80
85 CR 500
83 XL 600
82 XR 200
79 XR 75
79 Odyssey
73 Bultaco 360
71 Rickman Montessa 250
70 Rupp Enduro
69 Honda 50