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<blockquote data-quote="SRAD97750" data-source="post: 171525" data-attributes="member: 425"><p>I have a few of the same bike. What are you looking for in all this?</p><p></p><p>Primary reduction is ~4:1 on these motors.</p><p>Otherwise it's very simple math.</p><p>(Engine RPM/4) then (Clutch RPM/Ratio)</p><p></p><p>Sprocket RPM</p><p>1st- 775 RPM</p><p>2nd- 1129 RPM</p><p>3rd- 1518 RPM</p><p>4th- 1881 RPM</p><p>5th- 2213 RPM</p><p></p><p>Which, with an 18" wheel (66 inch circumfrence) and stock gearing (13/35)(2.69:1) is a 'mathematical theoretical' top speed of...</p><p></p><p>1st- 17 MPH</p><p>2nd- 27 MPH</p><p>3rd- 36 MPH</p><p>4th- 44 MPH</p><p>5th- 51 MPH</p><p></p><p>Good luck... I find mine top at about 65 mph in 5th gear pinned with stock gearing, downhill, with a tailwind.</p><p>-BIG DAN<img src="https://www.dirtbikeaddicts.com/static/images/smilies/thumb.gif" class="smilie" loading="lazy" alt=":thumb:" title="Thumb :thumb:" data-shortname=":thumb:" /></p></blockquote><p></p>
[QUOTE="SRAD97750, post: 171525, member: 425"] I have a few of the same bike. What are you looking for in all this? Primary reduction is ~4:1 on these motors. Otherwise it's very simple math. (Engine RPM/4) then (Clutch RPM/Ratio) Sprocket RPM 1st- 775 RPM 2nd- 1129 RPM 3rd- 1518 RPM 4th- 1881 RPM 5th- 2213 RPM Which, with an 18" wheel (66 inch circumfrence) and stock gearing (13/35)(2.69:1) is a 'mathematical theoretical' top speed of... 1st- 17 MPH 2nd- 27 MPH 3rd- 36 MPH 4th- 44 MPH 5th- 51 MPH Good luck... I find mine top at about 65 mph in 5th gear pinned with stock gearing, downhill, with a tailwind. -BIG DAN:thumb: [/QUOTE]
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