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Old 05-08-2008, 01:10 PM   #1
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Question Thinking of going +1 on the front sprocket...

...and I'm wonderin; should I stop there or should I go -1 on the rear as well? I am doing this b/c 1st if pretty useless on the 2fiddy (maybe 10-15mph in 1st) and I'm normally revvin pretty high in 2nd by the time I get through the intersection. (No this is not b/c I treat every light like the light tree @ the drag strip )

So I've on how to do it and I'm sure it's a lot easier said than done, but I would like to tackle this one myself. Anyone have any helpful input on this? Anyone have experience doing this that maybe would like to come over and supervise (I can provide ice cold beer )? If it's better left to the pros let me know that too.

Thanks in advance...
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Old 05-08-2008, 01:23 PM   #2
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I've never ridden a 250, how does it pull highway speeds? I know going down one in the front makes a big difference, going up will also. The good thing is that it's a pretty cheap experiment.

Do you have enough room on your chain for another tooth? IE can you move your back tire forward in the adjusters? It's "just" one tooth but chains don't stretch.

Is there enough room in there to get the sprocket off without breaking/removing the chain? Some bikes you can, others you cannot. If you break it, make sure you have a new master link handy, I doubt it's a clip link from the factory. If you want to put a rivet link back on the chain, do you have a chain tool?

What is holding the drive sprocket in place? Is there a nut on there? If so, an impact gun will make it easier to take it off. You can almost always do it without though.

I think that's about all the big stuff you need to consider.

I'm not far from Clear Lake and can assist if needed. I normally have a chain tool but right now it's on loan to someone. (note to self: look into chain tool return) I do have the rest of the tools needed for this job.
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Old 05-08-2008, 01:24 PM   #3
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Down one on the front.
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Old 05-08-2008, 02:05 PM   #4
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I think it pulls just fine on the freeway, but I don't have anything to compare it to. I am normally b/t 8-9k rpms while cruisin @ 70mph (redline is 13k). I would be doing it to get more out of 1st gear rather than trying to reduce highway rpms/fuel consumption, so that's just a bonus .

As for the other questions..... I don't know the info and I don't have said tools Oh but I do know that Tim did move my rear wheel 1 notch (apparently it somehow was out of alignment so the left side was on like notch 2 while the right side was on notch 3) but I'm not sure if that's enough to add a tooth...would that mean that I have to drop a tooth in the back or get a new chain?
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Old 05-08-2008, 02:06 PM   #5
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for increased acceleration you go down teeth on the front and up teeth on the back.
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Old 05-08-2008, 02:10 PM   #6
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I thought -1 in the front would give me a taller 1st gear...
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Old 05-08-2008, 02:11 PM   #7
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Quote:
Originally Posted by GQ* View Post
I thought -1 in the front would give me a taller 1st gear...
it will, it will give you a higher top speed in each gear, but reduce the acceleration.

you'll reach a higher top speed in each gear, but it will take you longer to get there.

a stunt bike for example will have a big- pizza pan rear sprocket. Lots of extra teeth on the rear equals LOTS more acceleration, but their top speed will be like 70mph.
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Old 05-08-2008, 02:11 PM   #8
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Quote:
Originally Posted by Moody View Post
Down one on the front.
Quote:
Originally Posted by less_than_coop View Post
for increased acceleration you go down teeth on the front and up teeth on the back.


down one in the front, and/or up 2 in the rear for faster


but what topspeed those things have will drop
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Old 05-08-2008, 02:12 PM   #9
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Quote:
Originally Posted by less_than_coop View Post
for increased acceleration you go down teeth on the front and up teeth on the back.
I think it usually goes 1 to 2... so if you go -1 on the front, then you go +2 in the rear... if you want faster acceleration then either -1f/+2r or -1f/stock rear...

If you had adjustments made and it was off that much, it could be that your chain was wearing uneven, undue stretch... how does it sound now? Is it stretching prematurely? Are you having to adjust it every ride? If so, then get a new chain... if not, then leave it...
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...... but when i have problems being able to screw other things i normally tie them up and lube the out of it. dont be afraid do get rough with it. if you cant handle it with the tool you have maybe the task is to hard for you. in which case if could be time for some tag team action and maybe even a foursome...
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Old 05-08-2008, 02:15 PM   #10
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Quote:
Originally Posted by less_than_coop View Post
it will, it will give you a higher top speed in each gear, but reduce the acceleration.

you'll reach a higher top speed in each gear, but it will take you longer to get there.

a stunt bike for example will have a big- pizza pan rear sprocket. Lots of extra teeth on the rear equals LOTS more acceleration, but their top speed will be like 70mph.
+1 in front with make you have a higher top speed. -1 in the front with give you more low end get up and go. It will make the gear shorter and your top speed slower.
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Old 05-08-2008, 02:19 PM   #11
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that's fine, I think it tops out around 105-110...don't need to be doing that on the street anyways
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Old 05-08-2008, 02:20 PM   #12
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Quote:
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that's fine, I think it tops out around 105-110...don't need to be doing that on the street anyways
So are you going to change sprockets or not?
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Old 05-08-2008, 02:21 PM   #13
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wait wait wait...so -1f will make the gears shorter? That means I'll be in 3rd before I cross the intersection
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Old 05-08-2008, 02:21 PM   #14
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Quote:
Originally Posted by TheMagicMan View Post
+1 in front with make you have a higher top speed. -1 in the front with give you more low end get up and go. It will make the gear shorter and your top speed slower.
That's IF the bike can pull higher gearing. On a 250 you might LOSE top end. Can a 250 redline top gear? If not then you would likely lose top end. As far as fuel consuption goes, I don't think the gain would be noticable and might actually have a loss since the bike will have to pull harder to accelerate.
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Old 05-08-2008, 02:22 PM   #15
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Quote:
Originally Posted by 97900rr01f4i View Post
So are you going to change sprockets or not?
I was saying that's fine to reducing the top end. I want to do it and still plan on doing it....
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Old 05-08-2008, 02:27 PM   #16
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So you are really looking for more low end torque? and if 1st was too short then it will be even shorter after you do a gear change.
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Old 05-08-2008, 02:32 PM   #17
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you guys are confusing me with all this mumbo jumbo....

+ in the front = lose accel, gain top speed
- in the front = gain accel, lose top speed

+ in the rear = gain accel, lose top
- in the rear = gain top speed, lose accel

if you are mechanically inclined, changing a front sprocket is easy....only hard part about it is breaking the bolt loose. remember to use some blue locktite on it when putting the bolt back on.
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Old 05-08-2008, 02:36 PM   #18
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Quote:
Originally Posted by 97900rr01f4i View Post
So you are really looking for more low end torque? and if 1st was too short then it will be even shorter after you do a gear change.
Initially, I was looking into this so that I could make 1st gear taller (so that it's going to take me past 12 mph...I wasn't looking to make the bike faster on take off but that would be a welcome bonus
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Old 05-08-2008, 02:37 PM   #19
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OKAY let's try this...

Hey guys

I'm looking to get more out my 1st gear. I thought I read that going +1f and maybe -1r would accomplish this. Anyone have any input on how to make my first gear more useful?
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Old 05-08-2008, 03:14 PM   #20
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Okay, so if I can get someone to come and supervise the project, how long would it take start to finish?
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