JR50 Mods and replacment (BIGGER) tires.. - Motorcycle-Journal Forums

gra03cobra · 05-03-2005, 08:28 PM

I would like to know if there are other mods I can do to my sons JR50' other then the Fatty pipe comming soon, to make this thing have MORE torque to get him up the hills..(I Took out the washer, open the air box alittle).

Also I would like to know if I could put wider tires on this thing too...comes with 2.50x10 looking to see if I could go with 3.00x10 or 3.50x10....and where can I get the tires....

Thanks all that respond....

Ronnie

gra03cobra · 05-05-2005, 08:17 AM

Wow! No one can tell me a thing about this bike....?
Come on!

gra03cobra · 05-05-2005, 08:19 AM

well I found out (NOT HERE) that I can and did put on some 2.75x10 Dunlop 773. Much better tire then stock!....

Now can anyone tell me about the 2 gears that this JR50 has. How can I do it...what other mods to WAKE this 50 up????

Dave2122 · 05-05-2005, 03:27 PM

I have an 03 JR50 but it is bone stock. I would have responded if I had any info for you but I didn't. They are great machines for kids to learn on and they seem to be very well built as I have had zero problems with it and my son rides it almost every day!

My sons JR50 only has neutral and 1st gear. That is it for the gearbox, so I am unsure what you mean by gears? Are you talking about sprockets?

gra03cobra · 05-05-2005, 07:24 PM

No I did a search here for "JR50 MODS" and come up with some thing about it having 2 gears..It come stock in 2nd...you need to mod some thing in the gear box to get it in 1st(For the bigger hill)...But I dont know WTF they were talking about??
My son is a VERY fast learner and had is firts race last weekend (Got blown away by the KTM50's)...So I am looking around for some things to do,for now till he gets bigger then the bike goes to his sister, to make it go faster. I odered a "Fatty Pipe" that will come by the end of the week...Now I am looking into the sprocket thing...been looking around but only found stock ones...

1. Looking for the Gear Box MOD...
2. Looking for a bigger rear Sprocket...
3. Anyother Mods...(New or Shave the head, bore out the cylinder 1-2-3mm???)...
4. Just Break down and get him a better bike (KTM50...???)..

Dave2122 · 05-05-2005, 09:18 PM

Jr50's are really ment for learning not racing against purpose built 50cc motocrossers.
There is no "extra gear in the gearbox.

gra03cobra · 05-06-2005, 06:48 AM

Look at this post!
http://www.suzuki-bikes.com/forum/sh...highlight=jr50

And this is what I think you need to do to get the 2 gears...
http://www.dirtrider.net/teamdrn/dat...ox_mod-med.jpg

Just not sure...if some one could help!

gra03cobra · 05-06-2005, 03:31 PM

anyone??? ttt

Dave2122 · 05-06-2005, 05:17 PM

Well I guess an aftermarket second gear is available.....I would like the specifics as "adding 2nd gear in minutes" sounds a bit odd to me.

gra03cobra · 05-06-2005, 06:29 PM

I just want to get this thing to go over bigger hill..(More Torque)...Does anyone know of a rear sprocket I could put on...??

gra03cobra · 05-12-2005, 07:20 PM

Anyone...!

digipoi · 05-17-2005, 08:28 PM

Ive looked at doing that mod to my sons bike but decided its not worth it. Didnt want to ruin that metal piece and be left ordering a new one for a nasty price. Lets face it, that little bike is really not made for steep unless you get a good running start. My son rides mostly trail with it and I have to get a kick stand for the amount of times I need to put my bike down to help him out. He rushes some vert lips and the bike is actually dangerous for that type of stuff (rolling backwards). He does really well though with the running start.

Some things I have done was change his piston to a Wiseco one, remove his oil resorvoir and run premix, and put some of those red millville mud tires. Those helped. I saw that FMF fatty combo but was hesitant because of the price. For that amount of money, I really dont think it will be cost worthy. Id like to know how it works for you though. Keep me informed.

As for larger tires, personally I wouldnt burden the motor.

digipoi · 05-17-2005, 08:31 PM

Plus, I believe that elongating that hole with make first gear a click upward which means it will be really easy to step it into neutral while on a hill climb. Not good.

gra03cobra · 05-19-2005, 12:02 PM

WOW some one that responded...Thanks!!!
I did put on the 2.75x10 tires and the fatty pipe. It has some more torque but again just not like a KTM 50 (Which Im looking to buy)...I also drilled out the main jet 2 sizes bigger and that helped too....next is the main sprocket...going to a 12 from the stock 13...we shall see...he loves it, he just became 5 and rides like he has been ridding forever...(riding only 3 months)...He just keeps asking me to make it faster like the other bikes he rides with...(KTM Pro 50's)...I will some day get him a KTM or a LEM 50 but I want him to be REAL used to riding..(MX Rider)...This bike is going to his sister when she becomes 5 shes 3 right now...I just bouhgt this bike and NOW I wish I would have done more looking around and got him a better (MX) bike!...o well...Live and learn!

digipoi · 05-20-2005, 07:53 PM

Yeah, its a great starter bike for sure. I too have been eyeing up the KTMs and will probably opt for one by the end of the year. I had my son on his JR from about 3 1/2. Suited him fine back then. Now hes a little taller and needs some real power.

Did changing the main jet help much?

gra03cobra · 05-22-2005, 04:00 PM

Some what...the bike has no bottom torque...(2hp)..To get this torque, the Top end must be milled down to raise the compresion (3-5 hp)...The KTM Pro 50's come with 5-12hp. And have a bigger rear sprocket...More low end torque... I just wished the dealer told me that this JR50 was for 3-5 yo that NEVER road a bike before...I guess little sister will get this bike with some training wheels soon...

Any thoughts on a bike called a Macbor 510 50cc's ???

Thanks

digipoi · 05-23-2005, 01:05 PM

Ive only seen the macbor's on the web. Might be decent, the spaniards make some decent bikes (gasgas). Ive seen the polinis around the track and they seem like rockets. I would be more concerned with replacement parts availability, especially if youre going to race it. Shouldnt be too much of a problem though. Wish Suzuki made a good inbetween bike.

Dave2122 · 05-23-2005, 03:05 PM

There is the Suzuki RM60/KX60 that is made by Kawasaki.......I see the KTM 50/60 is a real screamer. At my local track the KTM's outnumber all other brands by 3 to 1!

gra03cobra · 05-23-2005, 07:34 PM

Yeah... the only thing Suz/Kawa have are 60's that are to big for my son. Wish they had a race bike like the KTM 50cc....

digipoi · 05-24-2005, 03:45 AM

KTM 50 is the next purchase for my boy come around January 06. Really like the look of them plus the height is right.

05-03-2005, 08:28 PM	#1 (permalink)
gra03cobra Where Am I ? Joined: Apr 2005 Posts: 33	JR50 Mods and replacment (BIGGER) tires.. I would like to know if there are other mods I can do to my sons JR50' other then the Fatty pipe comming soon, to make this thing have MORE torque to get him up the hills..(I Took out the washer, open the air box alittle). Also I would like to know if I could put wider tires on this thing too...comes with 2.50x10 looking to see if I could go with 3.00x10 or 3.50x10....and where can I get the tires.... Thanks all that respond.... Ronnie

05-05-2005, 03:27 PM	#4 (permalink)
Dave2122 Sprocket Pilot Joined: Sep 2004 Bike: Which one of the 9? Location: USA Posts: 887	I have an 03 JR50 but it is bone stock. I would have responded if I had any info for you but I didn't. They are great machines for kids to learn on and they seem to be very well built as I have had zero problems with it and my son rides it almost every day! My sons JR50 only has neutral and 1st gear. That is it for the gearbox, so I am unsure what you mean by gears? Are you talking about sprockets? Last edited by Dave2122; 05-05-2005 at 03:29 PM.

05-05-2005, 07:24 PM	#5 (permalink)
gra03cobra Where Am I ? Joined: Apr 2005 Posts: 33	No I did a search here for "JR50 MODS" and come up with some thing about it having 2 gears..It come stock in 2nd...you need to mod some thing in the gear box to get it in 1st(For the bigger hill)...But I dont know WTF they were talking about?? My son is a VERY fast learner and had is firts race last weekend (Got blown away by the KTM50's)...So I am looking around for some things to do,for now till he gets bigger then the bike goes to his sister, to make it go faster. I odered a "Fatty Pipe" that will come by the end of the week...Now I am looking into the sprocket thing...been looking around but only found stock ones... 1. Looking for the Gear Box MOD... 2. Looking for a bigger rear Sprocket... 3. Anyother Mods...(New or Shave the head, bore out the cylinder 1-2-3mm???)... 4. Just Break down and get him a better bike (KTM50...???).. Last edited by gra03cobra; 05-05-2005 at 07:26 PM.

05-17-2005, 08:28 PM	#12 (permalink)
digipoi Seat Tester Joined: Sep 2004 Location: Honolulu Posts: 84	Ive looked at doing that mod to my sons bike but decided its not worth it. Didnt want to ruin that metal piece and be left ordering a new one for a nasty price. Lets face it, that little bike is really not made for steep unless you get a good running start. My son rides mostly trail with it and I have to get a kick stand for the amount of times I need to put my bike down to help him out. He rushes some vert lips and the bike is actually dangerous for that type of stuff (rolling backwards). He does really well though with the running start. Some things I have done was change his piston to a Wiseco one, remove his oil resorvoir and run premix, and put some of those red millville mud tires. Those helped. I saw that FMF fatty combo but was hesitant because of the price. For that amount of money, I really dont think it will be cost worthy. Id like to know how it works for you though. Keep me informed. As for larger tires, personally I wouldnt burden the motor. __________________ 2004 RM250 2004 DRZ125L 2006 TTR-90E 2004 JR50 1993 RM250 1990 KDX200

05-17-2005, 08:31 PM	#13 (permalink)
digipoi Seat Tester Joined: Sep 2004 Location: Honolulu Posts: 84	Plus, I believe that elongating that hole with make first gear a click upward which means it will be really easy to step it into neutral while on a hill climb. Not good. __________________ 2004 RM250 2004 DRZ125L 2006 TTR-90E 2004 JR50 1993 RM250 1990 KDX200

05-05-2005, 08:17 AM	#2 (permalink)
gra03cobra Where Am I ? Joined: Apr 2005 Posts: 33	Wow! No one can tell me a thing about this bike....? Come on!

05-05-2005, 08:19 AM	#3 (permalink)
gra03cobra Where Am I ? Joined: Apr 2005 Posts: 33	well I found out (NOT HERE) that I can and did put on some 2.75x10 Dunlop 773. Much better tire then stock!.... Now can anyone tell me about the 2 gears that this JR50 has. How can I do it...what other mods to WAKE this 50 up????

05-05-2005, 09:18 PM	#6 (permalink)
Dave2122 Sprocket Pilot Joined: Sep 2004 Bike: Which one of the 9? Location: USA Posts: 887	Jr50's are really ment for learning not racing against purpose built 50cc motocrossers. There is no "extra gear in the gearbox.

05-06-2005, 06:48 AM	#7 (permalink)
gra03cobra Where Am I ? Joined: Apr 2005 Posts: 33	Look at this post! http://www.suzuki-bikes.com/forum/sh...highlight=jr50 And this is what I think you need to do to get the 2 gears... http://www.dirtrider.net/teamdrn/dat...ox_mod-med.jpg Just not sure...if some one could help!

05-06-2005, 03:31 PM	#8 (permalink)
gra03cobra Where Am I ? Joined: Apr 2005 Posts: 33	anyone??? ttt

05-06-2005, 05:17 PM	#9 (permalink)
Dave2122 Sprocket Pilot Joined: Sep 2004 Bike: Which one of the 9? Location: USA Posts: 887	Well I guess an aftermarket second gear is available.....I would like the specifics as "adding 2nd gear in minutes" sounds a bit odd to me.

05-06-2005, 06:29 PM	#10 (permalink)
gra03cobra Where Am I ? Joined: Apr 2005 Posts: 33	I just want to get this thing to go over bigger hill..(More Torque)...Does anyone know of a rear sprocket I could put on...??

05-12-2005, 07:20 PM	#11 (permalink)
gra03cobra Where Am I ? Joined: Apr 2005 Posts: 33	Anyone...!

05-19-2005, 12:02 PM	#14 (permalink)
gra03cobra Where Am I ? Joined: Apr 2005 Posts: 33	WOW some one that responded...Thanks!!! I did put on the 2.75x10 tires and the fatty pipe. It has some more torque but again just not like a KTM 50 (Which Im looking to buy)...I also drilled out the main jet 2 sizes bigger and that helped too....next is the main sprocket...going to a 12 from the stock 13...we shall see...he loves it, he just became 5 and rides like he has been ridding forever...(riding only 3 months)...He just keeps asking me to make it faster like the other bikes he rides with...(KTM Pro 50's)...I will some day get him a KTM or a LEM 50 but I want him to be REAL used to riding..(MX Rider)...This bike is going to his sister when she becomes 5 shes 3 right now...I just bouhgt this bike and NOW I wish I would have done more looking around and got him a better (MX) bike!...o well...Live and learn!

05-20-2005, 07:53 PM	#15 (permalink)
digipoi Seat Tester Joined: Sep 2004 Location: Honolulu Posts: 84	Yeah, its a great starter bike for sure. I too have been eyeing up the KTMs and will probably opt for one by the end of the year. I had my son on his JR from about 3 1/2. Suited him fine back then. Now hes a little taller and needs some real power. Did changing the main jet help much? __________________ 2004 RM250 2004 DRZ125L 2006 TTR-90E 2004 JR50 1993 RM250 1990 KDX200

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05-22-2005, 04:00 PM	#16 (permalink)
gra03cobra Where Am I ? Joined: Apr 2005 Posts: 33	Some what...the bike has no bottom torque...(2hp)..To get this torque, the Top end must be milled down to raise the compresion (3-5 hp)...The KTM Pro 50's come with 5-12hp. And have a bigger rear sprocket...More low end torque... I just wished the dealer told me that this JR50 was for 3-5 yo that NEVER road a bike before...I guess little sister will get this bike with some training wheels soon... Any thoughts on a bike called a Macbor 510 50cc's ??? Thanks

05-23-2005, 01:05 PM	#17 (permalink)
digipoi Seat Tester Joined: Sep 2004 Location: Honolulu Posts: 84	Ive only seen the macbor's on the web. Might be decent, the spaniards make some decent bikes (gasgas). Ive seen the polinis around the track and they seem like rockets. I would be more concerned with replacement parts availability, especially if youre going to race it. Shouldnt be too much of a problem though. Wish Suzuki made a good inbetween bike. __________________ 2004 RM250 2004 DRZ125L 2006 TTR-90E 2004 JR50 1993 RM250 1990 KDX200

05-23-2005, 03:05 PM	#18 (permalink)
Dave2122 Sprocket Pilot Joined: Sep 2004 Bike: Which one of the 9? Location: USA Posts: 887	There is the Suzuki RM60/KX60 that is made by Kawasaki.......I see the KTM 50/60 is a real screamer. At my local track the KTM's outnumber all other brands by 3 to 1!

05-23-2005, 07:34 PM	#19 (permalink)
gra03cobra Where Am I ? Joined: Apr 2005 Posts: 33	Yeah... the only thing Suz/Kawa have are 60's that are to big for my son. Wish they had a race bike like the KTM 50cc....

05-24-2005, 03:45 AM	#20 (permalink)
digipoi Seat Tester Joined: Sep 2004 Location: Honolulu Posts: 84	KTM 50 is the next purchase for my boy come around January 06. Really like the look of them plus the height is right. __________________ 2004 RM250 2004 DRZ125L 2006 TTR-90E 2004 JR50 1993 RM250 1990 KDX200