[goldidig]

Hi guys, I recently acquired a used 1985 DR125 with a fresh engine. The bike works excellent but is really gutless. Mechanically it is perfectso I decided to check what was on it for new sprockets. There is a 15 tooth on the front and a 50 tooth on the rear. I can get a 53 for the rear and as small as a 12 for up front. Would that make a big difference or would I have to get something even larger for the back? If so, I don't know what sprockets from what models will fit and what wont. All the afteermarket suppliers have listed up here is a maximum 53 tooth rear. Any advice you can pass along would be certainly appreciated guys.
Thanks!
Allan

 

[DRider]

53 teeth on the rear and 12 on the front should give you plenty of grunt. Remember, it is only a 125 4 stroke, so it will only deliver so much power. If you put too big a sprocket on the rear, it starts to foul the chain guide. I'm running 12/52 on my DR200 and its got plenty of low down torque, but no top speed. The 125 engine is a sleeved down 200 engine.