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I'm trying to revive an 86 trx250 that has seen better days. It is missing most electrical components and I have a few questions:

Can I use a CDI box and coil from an 85 ATC250ES and is there a way to bypass the reverse cdi even if disabling reverse is an option.

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NO - the CDI for the 85 ATC250 was unique to the 1985 model - part number 30410-HA0-003 superseded to 30410-HA0-013 and ultimately became part 30410-HA8-010 - it was used on 1985 ATC250ES and SX models only.

The CDI for the TRX250 is part number 30410-HA8-003 and was used on the 85-87 ATC250ES/SX and the TRX250

The question about reverse is immaterial until the ignition problem is solved - if you get the 1985 wiring harness then maybe it will be possible, but there was no reverse on the 85 ATC250, so if you swap the entire wiring harness and ignition, then the reverse question is answered.
 
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