Changing out different sized front sprockets on 250r atc

[Mr. Clean]

Well guess what , there are a few people on this forum, that sound like assholes and dickheads to me...

Is this type of language necessary? This is a family oreinted site.

So how many MPH are you going to lose by gearing down?

[sunnyday]

This is a family oreinted site.

Then it would probably make sense for you to also make a comment on the other thread, in which another poster put up a video of himself, purposely breaking the law, running from cops on a atv, and then other posters are responding in a manner that condones such actions .

I mean surely, purposely breaking the law, and running from cops and then posting a video about it, / bragging about it, on this forum, is a bit more serious then using the word " asshole" ?

But then again, maybe im not in the same world as others.

[sunnyday]

Is this type of language necessary? This is a family oreinted site.

So how many MPH are you going to lose by gearing down?

Well according to 1 poster, my changes should result in the atc performing as a 5 speed instead of a 6 speed, on top end results....along with limiting the amount of feathering needed to be done when riding in tighter styled trails.

Surley such changes wont result in catastrophic motor/transmission failure . Now, If I were planning to try and go thru 2 ft deep mudbogs that were 100 yards long , then its obvious I would be asking for trouble.

[briano]

Here is an answer to one of your questions. You can put up to a 32 inch atv tire on the back of your trike, all you have to do is take the rear fenders off and get different wheels.

[4x4van]

Funny how you continue to insist that you only want to run 21" tires, even as you continue to ignore "your own post" asking about 24"-25" tires (which has now been pointed out at least 3 times). And how you call people names when they point out those inconsistencies, then try to justify that name calling by pointing out a different post showing illegal usage. I agree, that video is terrible and should not be on this site, but that has nothing to do with you or your posts.

BTW, 21s are fine and are used all the time in the dunes. They are, in fact, the standard size paddles used on 250r's. In fact, I run 22" (22x11/8 Skat Traks) with 12/39 gearing, while my wife's 250R runs 21" (21x12/8 Skat Traks) with stock 13/39 gearing.

Ultimately, what I said about top speed is still valid. It is irrelevant. Want to go slower? Downshift. Slower still? Let off the throttle. Yes, I know, gearing to lower the top speed will also lower the speed in lower gears, but the reality is that you could care less about top speed. The question you really want to know the answer to is how to gear the 250R for better low-speed riding without requiring so much clutch feathering, not necessarily slower top speed. You just seem to be asking the wrong question (6th gear top speed). And even if you suceed, you may very well end up with cooling problems.

Even though your chain clears with the 11t with you sitting on the bike, that means nothing, as that is under sitting/compression conditions. While riding, the suspension will "droop", and that clearance will disappear with every suspension extension/droop. And as for "catastrophic engine/trans failure"...I've said it once, I'll say it again; running an 11t front sprocket risks breaking the engine case because of too much space between the chain and the casesaver. Yes, I've seen it happen. And yes, I do consider a broken engine case "catastrophic". An 11t on a 250R is asking for trouble. If you want that same gearing without the danger that an 11t brings, then run 12/42, which is almost exactly the same ratio as 11/39. You can take that advice or you can leave it. No skin off my nose. But with the 11t I suspect you will eventually be back on this site asking about using JB Weld or Gorilla Glue to repair your broken engine case. Just my opinion, and likely worth exactly what you paid for it.

[RoscoW]

Billy's R running 18" fast trekkers. An R can and will do any thing you ask of it, are there better machines for a task like this ....sure
http://www.youtube.com/watch?v=_xXFkjl6Wak

This is my main ride, 250R on 18" trekkers,stock gearing, tuned properly and it can and has done this for hours on end. it chugs along as slow as I want
http://www.youtube.com/watch?v=hWsGy...R3ZLl7mxtKU%3D

My wife riding my other R, stock gearing on original 20" tires, it could use some fine tuning on the 85 PJ carb if it's possible but it will also put along this slow for hrs.
http://www.youtube.com/watch?v=8JSRk...hPpk7CbFf0I%3D

I have found that 1 tooth on the front sprocket is similar to changing tire diameters 2". which means that a 13 tooth and 20" tires feels very similar to 14 teeth and 18" tires.
I would recommend loosing the 11 tooth front for the reasons given already and use a 12 tooth with the 20 - 21" tires you currently have. if you still find that you need to go slower for any given RPM then start changing the rear sprocket to a bigger one. Here you can get up to a 76 tooth. That should take the speed out it
http://www.rebelgears.com/officialrebelgearshome.html

Ross..

[sunnyday]

And as for "catastrophic engine/trans failure"...I've said it once, I'll say it again; running an 11t front sprocket risks breaking the engine case because of too much space between the chain and the casesaver. Yes, I've seen it happen. And yes, I do consider a broken engine case "catastrophic". ... with the 11t I suspect you will eventually be back on this site asking about using JB Weld or Gorilla Glue to repair your broken engine case. Just my opinion, and likely worth exactly what you paid for it.

Well I can assure you , that your opinion on this is 100% wrong . I would not use gorrila glue as a repair since I can easily fire up the tig welder and make a permanent repair rather quickly. I guess in that respect...most people who cant tig weld, would consider a cracked engine case a big problem..for me, its a pretty easy repair.

[willreed03]

Is this type of language necessary? This is a family oreinted site.

So how many MPH are you going to lose by gearing down?

This whole thread is entertaining me but I feel the need to point out that your avatar is not a very 'family friendly' avatar

[4x4van]

Well I can assure you , that your opinion on this is 100% wrong . I would not use gorrila glue as a repair since I can easily fire up the tig welder and make a permanent repair rather quickly. I guess in that respect...most people who cant tig weld, would consider a cracked engine case a big problem..for me, its a pretty easy repair.

That's great that you can TIG weld...however, depending on the damage, it could still require splitting the cases in order to TIG weld it correctly. That, in itself, is a major job, whether you can TIG weld or not. I just don't understand the insistence on a setup that could easily cause engine case damage (11t) when you can get the same gearing using 12/42, and not have to worry about it.

But you are going to do whatever you want, obviously, as evidenced by your refusal to even acknowledge any of the "negative" points that many of us continue to mention. Good luck.

[sunnyday]

Good luck.

No doubt im gonna need it !

With me putting rocks in my cylinder , using 32" rear MONSTER tires , 11 tooth front sprocket , using gorilla glue to repair my broken piston rod and driving thru mud bogs that are 3 ft deep and 2 miles long, im gonna need all the luck I can get ! But somebody has to push the limits of these 250r - 2 strokers. { hey, im just participating in the same style over exxaggerations that some other posters have been engaging in } :}

[Mosh]

Everyone just needs to chill and take a deep breath. Just let the guy do what he wants. This is getting nowhere.