<div class="FTQUOTE"><begin quote>Originally posted by: Sir Hiss

Great...the screw heads on my carb are completely boogered. I have the easy-out tool to remove them, but I suppose now I need new screws to replace them with. Where can I find new carb screws, should I look towards Mikuni or a Bombardier dealership?</end quote></div>

Do some searches for "carb screws" and there is a thread that lists all the screw sizes you will need. Get stainless, allen head screws... it will make any changes super easy.

 

I still don't see the point of regearing for better acceleration.

Do you people do a LOT of first gear riding or something? Or do you always launch in 1st gear in a drag even if 1st gear is geared rediculously low?

I think it's a waste of money to gear down your quad and then launch in 2nd gear in drags. It's better to just gear up a little and launch in 1st gear- that way you have a really nice top speed and can just cruise in 5th gear, half throttle doing 70-75mph.

 

<div class="FTQUOTE"><begin quote>Originally posted by: crazy1291

I still don't see the point of regearing for better acceleration.



Do you people do a LOT of first gear riding or something? Or do you always launch in 1st gear in a drag even if 1st gear is geared rediculously low?



I think it's a waste of money to gear down your quad and then launch in 2nd gear in drags. It's better to just gear up a little and launch in 1st gear- that way you have a really nice top speed and can just cruise in 5th gear, half throttle doing 70-75mph.</end quote></div>

I might try a first gear launch on a DS250 but anything with some real nutz would put you on your @ss real quick. Gearing down (front) is one of the best mods you can make for the cost, and in some situations like extensive power mods it is absolutly necessary for any sense of normal ridability. Its about acceleration not top speed... if you could even get that 250 topped out, the folks who geared down will be long gone, and you will have a face full of dust. Do some more reading about this topic, you will find that 99.9999% of people out there will disagree with your logic.

 

Well the thing is that I'm am completely sure that I am right. If you moved from a 16t front to a 15t front, it would only help you if your quad doesn't have the ***** to rev out instantly in first gear. Since he is piping it and rejetting along with maybe a new air filter and no-lid, why not just gear up and get a front sprocket with 1-2 bigger tooth and launch in first gear instead of getting a smaller sprocket and launching in second. Getting a smaller front sprocket only makes your 1st gear obsolete.

The only reason I can see for wanting to launch in second gear is that maybe you are worried about accidentally shifting from first-softclick-neutral, instead of shifting from first-softclick-hardclick-2nd. (In my experience, every bike i've ridden I could feel a very soft click when you go from 1st to neutral and then a harder click when I go from neutral to 2nd)

How much do sprockets cost anyways? $30 for a cheap one? I recommend you just try riding with 1 tooth bigger than stock instead of 1-2 tooth smaller than stock (which I'm guessing you have.) It makes sense on paper to gear taller and launch in 1st gear. You will of course have a bit more trouble with TIGHT trail riding then due to the higher likelyhood of stalling at 10-15mph but for cruising it would be a LOT better.

 

I'm with Fatholly on this one.

If you want to experiment, try this:
Get out your mountainbike, and have a friend with a stopwatch.
Put the chain on the smallest front sprocket and 2nd largest rear sprocket. Pick 2 points that are 50-75 yards apart. From a dead stop, see how fast you can get from point to point. Have your friend time you.
Next, switch to the middle sprocket up front and the largest sprocket in the rear. Using the same 2 points, see how fast you can get from 1 to the other. Compare the times. The latter will be the longer (slower) time.

Having a smaller front sprocket directly affects the final drive ration of every gear. Acceleration is king offroad. Dropping the front sprocket 1 or even 2 teeth will increase acceleration significantly enough to easily notice. Dropping top speed by a few MPH is the only downside.

When was the last time that you redlined in 5th and actually hit the rev limiter anyway? If you drag race someone that has lower gearing and even somewhat close power, you will have your tail handed to you.

Also, starting off in 2nd has another benefit - it helps to reduce wheelies and make more of your power get to the ground.

 

Let me try this again... Unless you have extensive engine mods (not just pipe, filter, carb) you WILL NOT be able to pull a taller (front) gear with any sense of competive acceleration. Sure over maybe a mile (or more) you will be able to eventually pull 5th gear, but as I said before the people your are riding with will have checked out. You say you would lose first gear... not true. Your first gear just has more power. For bigger guys that is invaluable. The reason for the second gear launch is to avoid wheelies when you drop the clutch at 7000 RPM. Let me tell you a little story about a bone stock DS and a fat guy who thought he was heavy enough to keep the front down on a 7k launch. Put me right on my @ss and my bike ghost rode for 50 yards.

It has nothing to do with missing shifts... it has to do with not enjoying a broken @ss, as well as not wanting to look like a complete rookie in front of the hotties at Glamis.LOL

Let me end this by saying, these are not thoeries, and there is nothing to debate. The physics involved in two gears and a power source is solid fact. Every greese monkey who has ever changed their sprockets can tell you the result.

One last question: have you ever changed your gearing to support your theories?

Yea, I didn't think so.

 

<div class="FTQUOTE"><begin quote>Originally posted by: FatHolly

... it has to do with not enjoying a broken @ss, as well as not wanting to look like a complete rookie in front of the hotties at Glamis.....</end quote></div>

I don't care who ya are, that's a funny phrase right there! (Said with a Larry TCG accent).

A broken @ss... Ha!

 

I also agree with Fat Holly being a 280# guy and busting my @ss at little sahara on the drags. My buddies watching though said everyone cheered for me as I let go of the handlebars and pushed my ds off the back wheels and on to all four. But honestly who remembers who won that race but I bet ya they still make fun of the faba who stood it up on end.... I consider myself like tin cup!!!!

 

FatHolly, do you ever use 1st gear? If you are still able to use it for casual riding, then it is a good idea to gear lower simply because you then have a really nice low gear for lugging it way down on the trails.

But if you don't use 1st gear at all now, then you should either gear a lot taller and launch in 1st, or simply take it out of your tranny if you have no need for a top speed of higher than with your current gearing.

But here, think about this: If the ratio of the engine RPM to front sprocket RPM is 5:1 in first, 4:1 in 2nd, 3:1 in 3rd, 2:1 in 4th, and 1:1 in 5th, and the bike runs a 20 tooth front and 50 tooth rear and launches in 2nd. This means that the ratio of the engine RPM to wheel RPM is 10:1. This is the ideal ratio according to "rider A." However, "Rider A" now never uses first gear because it is geared too short for his liking. What he could do though to maintain his 10:1 enginerpm-wheelrpm ratio is get a 25tooth front sprocket. This way, the bike will launch just as fast as before because it still has the same launching characteristics- just in a gear lower.

The gear you launch in doesn't matter as long as the engine RPM to wheel RPM remains the same. Gearing taller and launching in 1st gear is like having a 6th gear, you won't use it much, but when you do, you'll be flying (in 5th, you'll just be going as fast as though you had a 6th gear with stock gearing.)

 

<div class="FTQUOTE"><begin quote>Originally posted by: crazy1291

FatHolly, do you ever use 1st gear? If you are still able to use it for casual riding, then it is a good idea to gear lower simply because you then have a really nice low gear for lugging it way down on the trails.



But if you don't use 1st gear at all now, then you should either gear a lot taller and launch in 1st, or simply take it out of your tranny if you have no need for a top speed of higher than with your current gearing.



But here, think about this: If the ratio of the engine RPM to front sprocket RPM is 5:1 in first, 4:1 in 2nd, 3:1 in 3rd, 2:1 in 4th, and 1:1 in 5th, and the bike runs a 20 tooth front and 50 tooth rear and launches in 2nd. This means that the ratio of the engine RPM to wheel RPM is 10:1. This is the ideal ratio according to "rider A." However, "Rider A" now never uses first gear because it is geared too short for his liking. What he could do though to maintain his 10:1 enginerpm-wheelrpm ratio is get a 25tooth front sprocket. This way, the bike will launch just as fast as before because it still has the same launching characteristics- just in a gear lower.



The gear you launch in doesn't matter as long as the engine RPM to wheel RPM remains the same. Gearing taller and launching in 1st gear is like having a 6th gear, you won't use it much, but when you do, you'll be flying (in 5th, you'll just be going as fast as though you had a 6th gear with stock gearing.)</end quote></div>

Wow.... I tried to be diplomatic about this but, let me be blunt. You really have no idea what you are talking about. Again I ask: have you ever changed your gearing? It sure doesn't sound like it to me.