Honda Spree and Elite 50 Forums

Abreen89 sells a performance cdi that fits most of the 2 stroke Hondas for only $5.95 I'm gonna get one and play with it. I have a digital tach and an analog tach and a cyl head temp gauge on my spree, along with the mount for the phone for GPS. I'll know right away if it allows higher rpms or not. Worth a try. Now I want to try the aero cdi as well.

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i offered mouse an opportunity to "borrow" my cdi hopefully he bites, but if you give a mouse a cookie....lol

I just bought the performance CDI kit to test it out

is the 5.95 performance cdi and 19.99 cdi the same?

my 87 aero engine melted a piston with a 84 cdi. could be unrelated however.

hats off to the original poster!!!

I have never ever noticed any difference using different cdi boxes.

I do have the "performance" CDI it does not seem to make any difference.

I do not own an aero.

Johnniespeed were are you ????
swimmingfree

we still haven't had this claim verified.....

maybe now is a good time to show my color and asked to be schooled on exactly how a Capacitive discharge ignition works on an old two stroke like this?

i'm guessing something on the flywheel involving a magnet sends a "signal" to the cdi and then to the coil?

As it is a two stoke, the only variable it could control is when the spark is released right? so these cdis are maybe different by a few milliseconds? perhaps one ignites at top dead center and one a millisecond after?

it seems to me like there would be a flat out "best" time to have your spark ignite. ( am i on the right track or just looking silly?)

to date it seems the following exist. ( plz add to the list if im missing something)

>$5 performance CDI
>$20 performance CDI
>83-84 aero50 CDI
>Malossi CDI
>two spree CDI's
>85-86 Aero CDI
>87-2001 Honda two stroke CDI


if Honda didn't change anything from 87-01.... il bet a penny that is the cdi who is most environmentally friendly

i could be wrong but im pretty sure 2 strokes actually retard the timing as the rpm goes up maybe some of the OG's may chime in and let us know there thoughts

Yes typically on a two stroke all the timing advance happens early in the lower rpm range. Then as revs increase the timing is retarded quite a bit tell max rpm. Opposite of a 4 stroke. The exception being a turbo motor where one might pull timing under boost to avoid detonation.

The stator has a two sections that produce voltage, one section provides the primary voltage that powers up the coil primary winding, the pulse coil produces a pulse that provides the crankshaft position information to the CDI box. The CDI box takes the crankshaft location information and the rpm information and by way of an internal logic map will collapse the voltage to the primary winding within the coil, at a specific time. When the primary winding is energized a magnetic field is produced, when the CDI opens the circuit the collapsed magnetic field will produce a secondary voltage and that is what we call spark.
What I would like to find out is how to log the data of the timing curve within the CDI box.
The timing map within the CDI is programmed to have a certain timing at idle, 2k rpm, 3k rpm, 4k rpm and so forth. If we have the information to log the data, then each CDI box could be compared to the 84 Aero 50 CDI box.
The 84 Aero 50 CDI box has the numbers " CF 411 C 9.7 279. I have no idea if those numbers are important.
This was never intended to brag that my scooter was faster than anyone else's scooter, I just wanted information and possibly pass information to others.
Having the worlds fastest Spree is like receiving a Gold ribbon at the Special Olympics, both are something to be proud of. But you have to look at the big picture.
Ten Spree engines equal 25 horsepower, my KX 500 has well over 55 horsepower yet they both have about 500 cc.
A Turbo Hayabusa would pass the KX 500 before third gear, a F-22 fighter jet probably cant go as slow as a Hayabusa at top speed.
All I was doing is comparing a Spree CDI to a Aero CDI.
I hope this thread has stimulated some thought.
I live near Grand Rapids Michigan.

What I would like to find out is how to log the data of the timing curve within the CDI box.
The timing map within the CDI is programmed to have a certain timing at idle, 2k rpm, 3k rpm, 4k rpm and so forth. If we have the information to log the data, then each CDI box could be compared to the 84 Aero 50 CDI box.

One way is with an oscilloscope. The measurement is basic electronics - here's a tutorial link http://www.wisc-online.com/Objects/View ... ID=ACE3803. I I use a Tektronix digital storage scope which computes degrees. A simple degree measurement is shown below.

This was never intended to brag that my scooter was faster than anyone else's scooter, I just wanted information and possibly pass information to others.
Having the worlds fastest Spree is like receiving a Gold ribbon at the Special Olympics, both are something to be proud of. But you have to look at the big picture.
Ten Spree engines equal 25 horsepower, my KX 500 has well over 55 horsepower yet they both have about 500 cc.
A Turbo Hayabusa would pass the KX 500 before third gear, a F-22 fighter jet probably cant go as slow as a Hayabusa at top speed..

Ok, no bragging. Yet - there have been several requests for the model year of your Spree. Response for Spree info is evasive. Latest response - 'My KX 500 has 55 hp' that's more than 10 Sprees

An oscilloscope simply measures voltage and time, in order for it to record the timing map the actual crankshaft position and degrees would need a base line setting. I would imagine a crankshaft position sensor would need to be added to gather data. But then again, I am hoping someone will already know how this needs to be done.
Evasive ? Sorry I don't monitor this site hourly, the Spree CDI is an 86, the Spree is an 86. The KX500 is a 2004. I don't own a turbo Hayabusa yet, the F-22 is not available to the public.
The Spree has been sold with the Aero CDI on it, new owner is very happy.

in order for it to record the timing map the actual crankshaft position and degrees would need a base line setting. I would imagine a crankshaft position sensor would need to be added to gather data

A) Sure - yet right now we don't need an absolute map.
B) Even if we have a full map, finding a CDI to match other than the Aero may not pan out.

-- Working plan --
1) Foster reproduction of results. This must be reproduced on a members Spree. As seen in this site or thread, many have tried CDI's with adjustable or 'racing' maps with zero to minor gains.

2) I will measure deltas between 83/84 Aero vs Spree CDI (1986-87 to match your model). No crank sensor required.

3) Two thumbs up? I will add a crank sensor for TDC and capture absolute data.

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Edit: Add
Why not use the method on old cars?

Put a mark at TDC on the flywheel, make a +/- degree scale to mount on the crankcase and use a timing light and tach.

any updates?

Sorry for a double bump but this is relevant to me once again.

Did i melt a hole in my 87 af0fe piston for using a 84 nb50 cdi?