how to check CDI box

[dtr250r]

how do i check my CDI box on my 89 250r?

[mx91a]

Put it on a known good running machine and see if there is any change or put a CDI from a known good running machine on yours and see if it runs any better.

[dtr250r]

well, i dont know anyobdy else with another 250r

[wilkin250r]

CDIs are funny things, electrically. They're so complex that there isn't a real "test" for them. In order to function correctly, you would need to input all the little signals that it normally gets, you simply can't do that with a normal meter.

The test for a CDI is either to swap it with a known good one to see a difference, or the Honda Repair manual basically lays out a process of elimination. Test everything else in the electrical system, and if all the other stuff checks out okay, then replace your CDI because it's the only remaining possibility.

[dtr250r]

yup, thats waht i did, everything else was good, so time for a new cdi

[DnB_racing]

Originally posted by dtr250r
yup, thats waht i did, everything else was good, so time for a new cdi even with every thing else checked there is no guarantee the connector going to cdi is good,

with out a spare to swap its hard to be absolutely sure it is the cdi

[dtr250r]

Originally posted by DnB_racing
even with every thing else checked there is no guarantee the connector going to cdi is good,

with out a spare to swap its hard to be absolutely sure it is the cdi
ya, well thts really the only place i can start, im going to get a new wiring harness while im at it, mine is pretty butchered up