More low torque and pull from a JR50--How? - Motorcycle-Journal Forums

SRHookEm · 01-13-2004, 04:48 PM

OK, my 5 year old raced for the first time this weekend and loved it! It was obvious that the PW riders were smokin' the JR riders off the line.

What can I do to give more low end pull and torque? I see a 33 tooth rear sprocket by Moose (M640-21-33) but cannot verify that it will fit. I also am considering a FMF spark arrestor (FMF 023039). Will this work?

Any other mods suggested without engine work? It's a 2004 under warranty and I cannot change the engine due to MX rules for the PW class.

The Chad · 01-13-2004, 11:50 PM

bigger rear or smaller front sprocket will give you more low end feeling, if you can replace packing in the muffler, do that to.

01-13-2004, 11:58 PM

If he's that new to racing, I wouldn't mess with the bike much. What you want to do, primarily, is to ensure he's doing it for the fun of it. He should really learn how to lose with grace before you give him the tools to win.

Just my two cents.

SRHookEm · 01-14-2004, 11:06 PM

I said "he loved it!" He came in 8 out of 9 and could care less. He wanted to ride some more after we got home. After the second moto he rode up and asked if he could go around again--and then get his trophy! haha

At this point, the winning or losing isn't even in his mind. To him, if someone is behind him, he won. Lapping not included.

The Chad · 01-14-2004, 11:09 PM

you're doing your job right then "dad", good for you.

01-15-2004, 10:10 PM

Way to go, Dad and Parker.

01-13-2004, 04:48 PM	#1 (permalink)
SRHookEm Newbie Joined: Dec 2003 Posts: 5	More low torque and pull from a JR50--How? OK, my 5 year old raced for the first time this weekend and loved it! It was obvious that the PW riders were smokin' the JR riders off the line. What can I do to give more low end pull and torque? I see a 33 tooth rear sprocket by Moose (M640-21-33) but cannot verify that it will fit. I also am considering a FMF spark arrestor (FMF 023039). Will this work? Any other mods suggested without engine work? It's a 2004 under warranty and I cannot change the engine due to MX rules for the PW class. __________________ FotoFinish Racing Parker, Age 5, #5 Taylor, Age 10, #10

01-13-2004, 11:50 PM	#2 (permalink)
The Chad Site Wrench Head Joined: Nov 2003 Bike: crashed Location: Duncan B.C. Posts: 635	bigger rear or smaller front sprocket will give you more low end feeling, if you can replace packing in the muffler, do that to. __________________ A truly wise man asks more questions than he answers, I think I must be retarted

01-14-2004, 11:06 PM	#4 (permalink)
SRHookEm Newbie Joined: Dec 2003 Posts: 5	I said "he loved it!" He came in 8 out of 9 and could care less. He wanted to ride some more after we got home. After the second moto he rode up and asked if he could go around again--and then get his trophy! haha At this point, the winning or losing isn't even in his mind. To him, if someone is behind him, he won. Lapping not included. __________________ FotoFinish Racing Parker, Age 5, #5 Taylor, Age 10, #10

01-14-2004, 11:09 PM	#5 (permalink)
The Chad Site Wrench Head Joined: Nov 2003 Bike: crashed Location: Duncan B.C. Posts: 635	you're doing your job right then "dad", good for you. __________________ A truly wise man asks more questions than he answers, I think I must be retarted

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01-13-2004, 11:58 PM	#3 (permalink)
Anonymous Guest Posts: n/a	If he's that new to racing, I wouldn't mess with the bike much. What you want to do, primarily, is to ensure he's doing it for the fun of it. He should really learn how to lose with grace before you give him the tools to win. Just my two cents.

01-15-2004, 10:10 PM	#6 (permalink)
Anonymous Guest Posts: n/a	Way to go, Dad and Parker.

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