Honda TRX250R Forums banner

1 - 13 of 13 Posts

·
Registered
Joined
·
32 Posts
Discussion Starter #1
I am currently having some CDI problems. Went riding today and my R would rev to about half throttle and then start cutting out so I just moved the box and it revved passed half so now I know I need a new CDI I was wondering what is the best CDI box to run.

P.S. motor has been ported if that makes any difference.
thanks for your time.
 

·
Registered
Joined
·
413 Posts
unless you want to deal with the expense of the cr ignition which is the best and the end all fix. your probably best off just getting another oem box.
 

·
Registered
Joined
·
39 Posts
ive been having the same problem. I will give it throttle in the lower gears and it is like it hits a rev limiter but when i sixth gear and full throttle, it runs just fine. Like it chokes for fuel in the lower gears and misses almost. But in the taller gears, it is fine. Just happens when in lower gears and the motor spins up really fast. Gets a little better though after the motor gets completely warm but still happens a lot. Is this ignition related?
 

·
Premium Member
Joined
·
4,273 Posts
You guys running resistor plugs like the manual says, if so, take them out please throw them in the trash & get a B8ES & set it at .018.

Those old ignitions are weak enough as it is without installing a resistor plug to kill the spark even more.
Check with Ricky Stator or Service Honda for a CR ignition with lighting coils.
Neil
 

·
Registered
Joined
·
39 Posts
a B8ES huh, i am runnning a BR9ES at the moment cuz that is what ESR told me to run. I am guessing the R is resistance, never put it together in my head i guess. i will try some other plugs and see what happens.
 

·
Registered
Joined
·
32 Posts
Discussion Starter #7
No I am not running resistor plugs.

I know its the CDI because I had the plastic off and you could hold the throttle wide open and it would be cutting out like it does and then I would move the CDI and it would rev up like normal and you could control how high the motor was revving off of how you would holding the CDI. The bike would run really good for a while until the box would move then it would do the same thing, I also check the end of the plug to make sure they were getting a good connection and they were. When I order a new CDI I am also going to get a new wiring harness because I am sick of this little problem.
 

·
Registered
Joined
·
190 Posts
You guys running resistor plugs like the manual says, if so, take them out please throw them in the trash & get a B8ES & set it at .018. Those old ignitions are weak enough as it is without installing a resistor plug to kill the spark even more.

Neil
AMEN to that

Check with Ricky Stator or Service Honda for a CR ignition with lighting coils.
Neil
here lately i've been hearing mixed information in regards to this..... some say that there is NOT an ignition like this avail and others are saying there there IS. :huh:

i've been thinking about going to an alternate ignition such as the CR but, i really need the lights.

No I am not running resistor plugs.

I know its the CDI because I had the plastic off and you could hold the throttle wide open and it would be cutting out like it does and then I would move the CDI and it would rev up like normal and you could control how high the motor was revving off of how you would holding the CDI. The bike would run really good for a while until the box would move then it would do the same thing, I also check the end of the plug to make sure they were getting a good connection and they were. When I order a new CDI I am also going to get a new wiring harness because I am sick of this little problem.
that my freind sounds like you may have connection issues. ;) could be wong tho.
 

·
Registered
Joined
·
399 Posts
Im with 86 Quad R on this,sounds like a bad wiring harness or a bad ground.Just moving the CDI around shouldnt have the effect you are getting.Check the ground point on your frame first.CDI's usually work good or not at all.
 

·
Registered
Joined
·
435 Posts
Yep, connections. Check these wires:

Green: ground

Black with red tracer: power to the CDI

Black with yellow tracer: power from the CDI to the coil

Blue/yellow and Green/white are both the wires from the pickup coil to the CDI, telling it to spark the coil.

Check all those connections at their conection points, and you should find the problem.
 

·
Premium Member
Joined
·
4,273 Posts
Yep, connections. Check these wires:

Green: ground

Black with red tracer: power to the CDI

Black with yellow tracer: power from the CDI to the coil

Blue/yellow and Green/white are both the wires from the pickup coil to the CDI, telling it to spark the coil.

Check all those connections at their conection points, and you should find the problem.
Hummmm, that on a 250R
Last I remember the black wire with the white stripe in the harness end at the CDI was the main ignition wire.

Now wheres Geekers when you need him, hes the ignition guru.
That one connector point (black & white wire) at the CDI box sees alot of heat & will corrode & loose connection at times + the male pin in the CDI box can become loose in the box itself & its nothing but problems after that.
I read one time a guy took a small c clamp & put it on the CDI box close to the connector area & the problems went away, didnt take alot of tightening down either, just some lite preasure.
Neil
 

·
Registered
Joined
·
32 Posts
Discussion Starter #12
Thanks guy.....its a lot of help.....

C-Leigh Racing that sounds like that same thing that is going on with mine because if I hold it in my hand it will run right. I will give that a try tonight and see what happens.
 

·
Registered
Joined
·
435 Posts
Hummmm, that on a 250R
Yep, straight from the service manual, "Ignition System Inspection" chart. Just checked my '86 harness, and it matches this exactly. The Black/white wire does run from the Ignition Switch to the Engine Stop Switch, and they both "T," go through a diode, and go to the CDI. They certainly could cause the problem, too.
 
1 - 13 of 13 Posts
Top