{"product_id":"polarstar-fusion-installation-shim-kit","title":"PolarStar Fusion Installation Shim Kit","description":"\u003cdiv style=\"background:#edfaf1;border-left:4px solid #27ae60;padding:12px 16px;border-radius:0 6px 6px 0;margin:0 0 16px;font-size:13px;\"\u003e\n\u003cstrong style=\"color:#1a6b3a;\"\u003ePolarStar Fusion Shim Kit — the cheapest part in the build, and the one that decides whether the engine performs.\u003c\/strong\u003e Sets correct alignment during installation.\u003c\/div\u003e\u003cp\u003eEngine alignment inside the gearbox shell is one of those details that sounds trivial and is not. An engine sitting fractionally out of position will not seal correctly against the hop-up, and the result is inconsistent velocity and poor air efficiency — symptoms people spend a long time blaming on regulators, nozzles and buckings.\u003c\/p\u003e\u003cp\u003eShims set that alignment properly. They are the least expensive component in an HPA installation and among the most likely to determine whether the build shoots the way it should.\u003c\/p\u003e\u003cp\u003eWorth keeping on the shelf if you fit engines, or buying alongside one if you are installing yourself. There is nothing more frustrating than a complete build held up by the smallest part in it.\u003c\/p\u003e\u003ch2 style=\"font-size:16px;color:#1B3A6B;margin:18px 0 8px;\"\u003eSpecifications\u003c\/h2\u003e\u003ctable style=\"width:100%;border-collapse:collapse;font-size:13px;margin:0 0 18px;\"\u003e\n\u003ctr style=\"background:#1B3A6B;color:#fff;\"\u003e\n\u003cth style=\"padding:7px 12px;text-align:left;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"padding:7px 12px;text-align:left;\"\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eType\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eInstallation shim kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eFits\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003ePolarStar Fusion engines\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003ePurpose\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eCorrect engine alignment during installation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003eBrand\u003c\/td\u003e\n\u003ctd style=\"padding:7px 12px;border:1px solid #eee;\"\u003ePolarStar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2 style=\"font-size:16px;color:#1B3A6B;margin:18px 0 8px;\"\u003eGood to know before you buy\u003c\/h2\u003e\u003cp\u003eA fitting consumable rather than an upgrade. If you are installing a Fusion yourself, order this at the same time — it is the sort of thing you discover you need with the gearbox already open.\u003cbr\u003e\u003cbr\u003eCorrect shimming is what gives you a proper seal against the hop-up, which is where consistency comes from.\u003c\/p\u003e\u003ch2 style=\"font-size:16px;color:#1B3A6B;margin:18px 0 8px;\"\u003eFrequently asked questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eDo I definitely need shims?\u003c\/strong\u003e\u003cbr\u003eIt depends on the gearbox and how the engine sits. Many installations need them, and finding out mid-build is inconvenient. It is worth having them to hand.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat happens without correct shimming?\u003c\/strong\u003e\u003cbr\u003eThe engine can sit slightly out of alignment, which causes air seal problems, inconsistent velocity and poor efficiency.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs it Fusion-specific?\u003c\/strong\u003e\u003cbr\u003eThis kit is for the Fusion platform. Tell us your engine if you are running something else and we will advise.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan you fit the engine for me?\u003c\/strong\u003e\u003cbr\u003eYes, and correct shimming is part of doing it properly.\u003c\/p\u003e\u003cdiv style=\"background:#fffbe6;border-left:4px solid #f0d060;padding:12px 16px;border-radius:0 6px 6px 0;margin:0 0 16px;font-size:13px;\"\u003e⚠ \u003cstrong\u003eRunning HPA:\u003c\/strong\u003e always feed an engine through a secondary regulator and never connect it directly to a tank output. Check the rated pressure before setting a regulator, and chronograph to your site limit before playing.\u003c\/div\u003e\u003cdiv style=\"background:#1B3A6B;color:#fff;padding:12px 16px;border-radius:6px;margin:18px 0 0;font-size:13px;\"\u003e\n\u003cstrong style=\"color:#fff;\"\u003e💡 Titan Forge Airsoft tip:\u003c\/strong\u003e order it alongside a \u003ca href=\"\/collections\/hpa-engines\" style=\"color:#cdd6f4;\"\u003eFusion engine\u003c\/a\u003e. We are an HPA tech centre and fit, tune and chronograph these in the workshop, or \u003ca href=\"https:\/\/wa.me\/447874452357\" style=\"color:#cdd6f4;\"\u003emessage us on WhatsApp\u003c\/a\u003e.\u003c\/div\u003e","brand":"Polarstar","offers":[{"title":"Default Title","offer_id":55648901136760,"sku":"10000286","price":13.95,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0562\/8097\/3450\/files\/PolarStarFusionInstallationShimKit_TitanForgeAirsoft.webp?v=1788520702","url":"https:\/\/www.titanforgeairsoft.com\/products\/polarstar-fusion-installation-shim-kit","provider":"Titan Forge Airsoft","version":"1.0","type":"link"}