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1983 yz 490 tuning
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[QUOTE="zoommx, post: 1275139, member: 22864"] Here some suggestions I found: Use this jetting as a starting point. It has been tested with a stock, DG, Retro Rocket, and ProForm pipe. 440 Main Jet (stock) R-0 Needle Jet-series 247 (richer than the stock Q-8) 6F8 Needle, clip in position 3 (Leaner on bottom than Stock needle) 40 Pilot (leaner than the stock 50) Air Screw 1 3/4 turns out (will vary with weather conditions) Carb Slide 3.5 (modify your stock 3.0 slide) Fuel Mix 40:1 Yamalube 2R Premium fuel (100-110 octane leaded is what I run) B8EG Plug gapped at .6mm To help with pinging some: This head modification will lower compression slightly. You can have a machinist do it or send it to Eric Gorr. This is probably the most prevalent head mod that was done on YZ490s. [url]http://tinyurl.com/yqmdyp[/url] if you know a machinist. [url]http://www.forwardmotion.com.mx/index.html[/url] to send it to Eric Gorr. helped my '82 490. good lukck, Roger [URL=http://movmx.com]MOVMX[/URL] #491 [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
1983 yz 490 tuning
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