{"rewrite":{"id":"r_ea193ef1aee29be88840f375","clusterId":"c_ec6f1ceeab90073c5d3ee4d9","slug":"bldb-launches-semto-7cc-inline-twin-engine-assembly-kit","model":"deepseek-v4-flash","headline":"BLDB Launches SEMTO 7cc Inline Twin Engine Assembly Kit","summary":"BLDB, the model brand behind the Building Block line, has started selling the SEMTO ENGINE ST-NF2/FS-L200AC, a 7cc inline twin 4-stroke SOHC engine assembly kit. Builders assemble the engine from unassembled parts, then start it on methanol glow fuel with 20 to 25 percent nitromethane. The kit uses dual timing belts, air cooling, and a 480 brush motor electric starter, with CNC-machined anodized aluminum parts. BLDB offers three purchase configurations.","whyItMatters":"The kit adds an inline twin layout to BLDB's metal engine model series, letting builders assemble and run a working engine rather than display a static replica.","webCardHtml":"\u003cp\u003eThe ST-NF2/FS-L200AC uses a long-stroke design with a 16.6mm bore and 17.0mm stroke per cylinder, rated at 4,000 to 16,000 rpm and 0.6PS. Power reaches the valve train through two timing belts, and starting is handled by a 480 brush motor fed by a 7.4V 2S lithium battery. The engine needs an F-type 4-stroke glow plug and a matching ignition module.\u003c/p\u003e\u003cp\u003eBLDB sells it in three configurations: the engine model alone, with an engine start kit, or with a start kit and base. The company notes the engine is not a toy, recommends it for ages 14 and up, and warns against running it in poorly ventilated rooms.\u003c/p\u003e","blueskyPost":"BLDB now sells the SEMTO ST-NF2/FS-L200AC, a 7cc inline twin 4-stroke SOHC engine you assemble yourself and start on glow fuel. Dual timing belts, air cooling, electric starter, CNC aluminum body. Three kit variants. Not a toy, ages 14+.","twitterPost":"BLDB now sells the SEMTO ST-NF2/FS-L200AC, a 7cc inline twin 4-stroke SOHC engine assembly kit that runs on glow fuel. Dual timing belts, air cooling, 480 brush motor starter, CNC aluminum. Three configurations. Ages 14+.","threadsPost":null,"newsletterBlurb":"BLDB has begun selling the SEMTO ST-NF2/FS-L200AC, a 7cc inline twin 4-stroke SOHC engine assembly kit that runs on methanol glow fuel. Builders assemble the working engine, start it with a 480 brush motor electric starter, and choose from three kit configurations. The company stresses it is a real engine, not a toy, and recommends ages 14 and up.","attributionJson":"[{\"source\":\"ASCII.jp\",\"url\":\"https://ascii.jp/elem/000/004/432/4432774/?rss\",\"title\":\"7cc直列2気筒を自分の手で始動へ。BLDB、SEMTO「ST-NF2／FS-L200AC」4ストロークエンジン組立キットを発売\"}]","lintFlagsJson":null,"lintHits":0,"costUsd":0,"inputTokens":6199,"outputTokens":2218,"status":"published","repairAttempts":0,"nextRepairAt":null,"factsAttemptedAt":1788759873,"createdAt":"2026-09-07T05:40:28.000Z","publishedAt":"2026-09-07T05:43:22.000Z","updatedAt":"2026-09-07T05:43:22.000Z"},"cluster":{"id":"c_ec6f1ceeab90073c5d3ee4d9","canonicalTitle":"7cc直列2気筒を自分の手で始動へ。BLDB、SEMTO「ST-NF2／FS-L200AC」4ストロークエンジン組立キットを発売","representativeArticleId":"a_98ba273369999acba13135cf","sourceCount":1,"writtenSourceCount":1,"writeAttempts":0,"isSolo":true,"entitiesJson":"{\"anime_titles\":[],\"manga_titles\":[],\"work_titles\":[\"ST-NF2\",\"FS-L200AC\"],\"studios\":[],\"people\":[],\"type\":\"announcement\",\"domain\":\"other\",\"is_roundup\":false}","contentType":"news","status":"published","firstSeenAt":"2026-09-07T03:29:14.000Z","lastSeenAt":"2026-09-07T03:29:14.000Z","updatedAt":"2026-09-07T05:43:20.000Z"},"attribution":[{"source":"ASCII.jp","url":"https://ascii.jp/elem/000/004/432/4432774/?rss","title":"7cc直列2気筒を自分の手で始動へ。BLDB、SEMTO「ST-NF2／FS-L200AC」4ストロークエンジン組立キットを発売"}],"entities":{"anime_titles":[],"manga_titles":[],"work_titles":["ST-NF2","FS-L200AC"],"studios":[],"people":[],"type":"announcement","domain":"other","is_roundup":false},"keyFacts":null}