2002 RM250 short first gear

M

mannerRM250

Member

Jan 21, 2010

2

0

• Jan 21, 2010

• #1

Just picked up a a used RM250. Bike is wicked fast but first gear has a very short range. Once on 2 or 3 it has a much wider range. Guy I bought bike from said it was jetted for the track and that is why 1st gear is short. Any way to tweek the bike to have a longer range on 1st? I welcome any input thanks

 

IndyMX

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Jul 18, 2006

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Amo, IN

• Jan 22, 2010

• #2

I don't think jetting has much to do with how long first gear is.

I'd discount pretty much anything else he said. First of all, you don't jet a bike for track.. You jet for atmospheric conditions, fuel and whatnot..

You're not likely to find many MX bikes with a very long first gear.

Your bike has at least 4 more gears for you to use. I have to ask, why the interest in a longer first gear?

Even on a tiny Arenacross track, first gear isn't a requirement.. I rode all day Sunday on a very tight indoor, never left second.

 

W

wake_rider

Member

Feb 21, 2007

481

2

• Jan 22, 2010

• #3

I rarely use granny-gear even on tight trails and tracks, but you might want to check out what sprocket set up he has. He might have changed the sprockets out for lower gearing in order to have a set up more geared for torque, but it would have nothing to do with jetting as jetting only effects fuel/air ratio and has no effect on the transmission or the aspect ratio of your gearing whatsoever...

 

C

Chili

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Apr 9, 2002

8,062

15

• Jan 22, 2010

• #4

Stock gearing for an 02 RM250 is 13/49 check what is on there now. I never noticed first gear being abnormally short on that bike.

 

whenfoxforks-ruled

Old MX Racer

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Oct 19, 2006

8,129

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Merrillville,Indiana

• Jan 22, 2010

• #5

Both the who needs 1st and whats the gearing now come to mind. If you need more 1st, bigger front or smaller back sprocket. 1st is for someone over 200 pounds, newbies, or riding on the street. Where you have the exhaust valve preload set will effect this also. Adjust the hit later is what you seemingly want. Get on it! Vintage Bob

 

J

jsantapau

Member

Nov 10, 2008

340

0

• Jan 22, 2010

• #6

whenfoxforks-ruled said:

Both the who needs 1st and whats on 2nd now come to mind.

Click to expand...

:whoa:

 

J

_JOE_

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May 10, 2007

4,697

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• Jan 22, 2010

• #7

I found 1st gear to be very dangerous on my 02 RM. Second is a much better choice. I used first to load it into the truck and try and free it if I got stuck. Even second would rip by in heartbeat. Just learn to use second gear and keep a finger on the clutch if the speeds get real low.

 

whenfoxforks-ruled

Old MX Racer

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Oct 19, 2006

8,129

2

Merrillville,Indiana

• Jan 22, 2010

• #8

jsantapau said:

:whoa:

Click to expand...

How on earth did your browser create that? Or maybe mine says something different? It sounded like the Lou Costello line there for a minute. I did not plagiarize him, did I? That is a whoa! Vintage Bob

 

J

jsantapau

Member

Nov 10, 2008

340

0

• Jan 22, 2010

• #9

no, sorry, I was plagerizing you with less than accurate results to create that.

it was just too close that I couldn't leave it alone

 

IndyMX

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Jul 18, 2006

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Amo, IN

• Jan 22, 2010

• #10

I thought it was funny.

 

whenfoxforks-ruled

Old MX Racer

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Oct 19, 2006

8,129

2

Merrillville,Indiana

• Jan 22, 2010

• #11

If I would have seen that in the morning, coffee and donuts on the keyboard for sure. Vintage Bob

 

M

mannerRM250

Member

Jan 21, 2010

2

0

• Jan 22, 2010

• Thread starter
• #12

short first gear

:cool thanks for everyones input.