Thunderslide Kits

4 products

Thunderslide Kits for Harley-Davidson are performance intake upgrades that replace the stock carburettor slide with a precision-engineered alternative for improved throttle response. Available from Iron City Motorcycles, an authorised Harley-Davidson dealer in Leeds, these kits cover Evolution Big Twin and Sportster models from the late 1980s through to 2006. Dynojet leads the range with Thunderslide kits tuned to deliver noticeably sharper acceleration and smoother fuelling across the rev range. Each kit is a bolt-on installation that works with your existing carburettor, making it one of the most effective single upgrades you can fit to a carburettor-fed Harley-Davidson without any permanent engine modifications. Browse the full range below.