I have a 85 ATC250R and I was thinking of changing the sprocket ratios because it pulls so good it feels like it is geared to low at stock, which is 13 front, 39 rear,. What are other sprocket ratios are people running and how well does it work ?

 

I agree with you. The stock gearing is too low. I use a variety of setups, but if you like woods riding and don't want to get too crazy, go to a 14/36. This is a good all around matchup.

If you have a modified motor and want to get sick top end, then run the 15/33. You can get a 16 from sidewinder, but you have to grind the case a bit to get the chain to fit. I use this setup in the winter, for cruising around the open lake. It gets scary fast our there.

 

I was thinking about running a 14/38 so I wouldnt have to buy a new chain. I dont think this would take away to much low end pull.

 

do you guys think my 84' 250r would pull those gearings? it will have a dg pipe and silencer soon and it runs great right now, all though it is pretty pokey...is the gearing worth the trouble for the torque i'd lose? how different is the 85-86 250r's compared to the 83-84 like mine? I knew the 85-86's were better, but i got mine for a song...$250 running and rideable. not bad. I love the 250r's, how bad do I need to go find and 86 for say? am I missing alot or just little improvements?

 

i run 12/39 on mine '85 as far as the 84 being different they are totally different.. when i bought my bike i got a 2 fer1 deal an 84 and 85 atc's so before i sold the 84 i was able to ride them both and check them out side by side..biggest diff in riding them is the susp..newer ones ride alot better Broke sounds like u got a helluva deal on yours i paid $1200 for both the 85 and the 84 and sold the 84 for 700 i think..it was over 10yrs ago my mind is getting a lil soft..cant remember

 

ohh man, I;d love to find a newer 250r then. I have a 88' CR250 dirtbike, which is a plain out rocket, so I'd imagine a newer 250r to be the same. any problems to look out for? -Mike