Model 97 Thunderbird
1 Mikuni carbs taken off and replaced with Keihin CVK carbs off a 2001 model
2 Airbox in the bin - fitted pod filters S&B maxi-flow 125-RC-T conical (2.25x3.5x2x4) onto the Keihin CVK's. These are totally "free flow" and would give the same air flow as no filters at all. Air inlet (bellmouth) size is 57mm (CVK's only, Mikuni are different size)
3 Restrictive intake rubbers (with dimple) replaced with unrestricted (smooth) intake rubbers. The unrestricted rubbers should be standard with Keihin CVK carbs
4 Standard spark plugs changed for NGK Irirdium DPR8EIX-9
5 Main #98 jets replaced with #120 jets - This works perfectly the plugs are just the right colour (I live at sea level). Jimmy reckons it might be worth trying #125's but the risk is it might run rich at 5000 rpm to 7000 rpm
6 Copper washer under each carb needle - didnt seem to make any noticable difference but did it anyway. The needles on CVK carbs are not adjustable.
7 Mixture screw taken another full turn out
Everything else is stock ! Fuel is standard 95 RON.
Picture at:
http://www.triumphrat.net/hinckley-c...120-mains.html
Im so pleased with the result I havnt bothered fiddling around anymore, The bike really smooths out at 4000 rpm to 5000 rpm and the iduction roar is fantastic bearing in mind the exhaust is standard. The economy as well as the power has noticably improved, I get about 20 more miles per tank. Recommended !
