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Erica NguyenAug 12, 2025
Why won't my Shindaiwa T450 start?
- JJill KimAug 12, 2025
Your Shindaiwa Trimmer might not start due to several reasons. The ignition switch might be in the “O” (OFF) position, so move the switch to “I” (ON) position. The spark plug could be loose, so tighten it and re-test. The fuel might be incorrect, stale, or contaminated, or the mixture might be incorrect, so refill with clean fresh unleaded gasoline with a pump octane of 87 or higher, mixed with Premium 2-cycle mixing oil at a 50:1 gasoline/oil ratio. Also, the plug may be fouled or improperly gapped; in that case, clean and re-gap the plug to 0.6 ~ 0.7 mm and re-start. If the plug is damaged internally or of the wrong size, replace it with a NGK BMR6A and re-start. Check for a clogged fuel filter and/or vent, and replace the fuel filter or vent as required, then restart.











