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Thread: Honda XL350

  1. #1
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    Honda XL350

    I would like to replace the sprockets on this bike and was wondering how the different sizes will affect it but there is very limited info on this bike. Its a 1985 and as it turns out they only made the 350R in 84 and 85 go figure.

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    Depends what your after, if you want more bottom end you can go as big as you want on the back. But if you want more top end you are probably better off with the stock gears unless that 350R is way more powerful than I think. You won't have enough power to red-line it in top gear or even get up to speed.


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  3. #3
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    You can change the front sprocket size one tooth at a time smaller. The ratio of change on front sproket is one tooth smaller on the front equals three teeth on the rear. Be carefull not to over gear the bike, you would run out of gearing for top end speed. I hope this helps. Cheers. Rusty Iron

  4. #4
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    One tooth on the front of my xr650r made a huge difference. Start there.

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    What kind of difference did it do. So if I change the front can I leave the rear alone.

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    the front sprocket change is the easiest, my KLR 650 responded well on the trail with a 1 tooth reduction in size...you can go up to 3 teeth smaller but you will see excessive chain wear...
    I wanted to get rid of the stumble in 2nd gear while crawling at low rpm in the tight stuff..

  7. #7
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    Down 1 tooth in the front gave me much easier slow-speed riding for tight trails.
    I didn't change the back, didn't even have to shorten the chain.

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    It sounds like going down 1 tooth in the front is what Im looking for, I would like the front end to come up easier than it does in first and second gear. This wont take away from the top end much will it.

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    It is a ratio. Divide front sprocket by rear. That is the drive ratio. Now you can change either front or rear but the increase or decrease will be relative to the change in ratio.

    If you know the transmission final drive ratio you can calculate the rpm vs speed change (theoretical) which will be dependent on there being enough power to overcome wind restance and parasitic losses.

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