CR 250 ignition

[leager-n-ky]

Anyone use a flywheel weight on theirs? Did you like it? Does anyone have a weight to fit an 01 cr flywheel they want to get rid of?

[ct350trx]

I had a +13oz from steahly offroad and it rides 10 times better

http://www.steahlyoffroad.com

I had to modify it a little to fit my esr cover

http://img22.imageshack.us/img22/6886/sfb3pj2.jpg

[cdrookie]

i have a 13oz weight, didn't make much difference. all250r had a good post about flywheel weight. it's the diameter thats more important than the weight, unfortunately i don't think there's one made thats much bigger than the cr flywheel.

[leager-n-ky]

The cr flywheel that i have now, is way smaller than stock trx flywheel.

[cdrookie]

right, they all are, but to get the maximum effect of a flywheel weight it needs to be larger than the flywheel. a lighter weight thats the same size as a stock trx flywheel will have more effect than one that's the same size as a cr flywheel. when i got my 13oz weight i thought it would kill the fast revving effect of the cr ignition cause it felt so heavy, but it actually did hardly anything.

i don't think anyone makes a flywheel weight that is any bigger than the one ct350' posted a pic of.

[leager-n-ky]

ok, I understand what you are saying now. Thanks

[Honda 250r 001]

only downfall to the cr ignition. for dunes its great because if it spins get more paddles. but when your in the trails, you cant get more paddles.

[250Renvy]

Just curious why you'd want the flywheel weight on a CR ignition? Isn't the point of owning a cr ignition to get the faster revs?

I believe I asked a question similar to this cause I have a Cr ignition but ride lots of trails/woods.

[leager-n-ky]

We have an indoor track here and its kinda tight, from what I have been reading the weight would smooth the power band out, right now its great, for outside

[05LSR250R]

Adding weight makes it so you can lug it around. Less weight makes it rev quicker.

[thedeatons]

That weight is over $100!!!

Two questions:

#1 Is it possible to set up for the CR ignition, then swap back to the 250R flywheel when needed, or would that require changing everything back?


#2 I have heard of everyone using the 2001 CR ignition parts, but it seems like I read somewhere that 2001-200? worked the same... Anyone know? Is it only one year that works?

[250r__Ice]

I found this on Thumper Talk forum. It list all the changes that were made to the CR250 from 1998-2006. It list the differences in the ignitions. If the link works.

http://www.thumpertalk.com/forum/showthread.php?t=425554

[thedeatons]

That is a spectacular link! Thank you! However it does not answer which ones work with our 250Rs.... :)

[250r__Ice]

This link may answer you question.

http://www.exriders.com/vbb/showthread.php?s=&threadid=313871&highlight=cr250+ignition

[250r__Ice]

It says in one of the post that 92-01 can be used with the adapter plate. 92-99 are analog. The 00-01 are digital with the 01 having the more desirable ignition curve.

[thedeatons]

Perfect answer!

[All250R]

Originally posted by 250r__Ice
It says in one of the post that 92-01 can be used with the adapter plate. 92-99 are analog. The 00-01 are digital with the 01 having the more desirable ignition curve.
What do you mean it's more desirable? More desirable for what exactly?

[250r__Ice]

Originally posted by All250R
What do you mean it's more desirable? More desirable for what exactly?


They say that the 01 is suppose to have the better ignition curve. The 01 is the one everybody wants. More power, faster revs,
better throttle response, etc. The "Desire" for more power, speed or what ever you like.

de⋅sir⋅a⋅ble
–adjective
1. worth having or wanting; pleasing, excellent, or fine.

[thedeatons]

Friend told me today their dyno is consistently showing 8hp with the ignition mod. That is on the bigger bores though, such as 350 and 370....

[mxduner]

some time ago i believe on this site, someone posted the actual timing curve graphs per year.anyone else recall seeing this? maybe on another site?:confused:

[All250R]

Originally posted by 250r__Ice
They say that the 01 is suppose to have the better ignition curve. The 01 is the one everybody wants. More power, faster revs,
better throttle response, etc. The "Desire" for more power, speed or what ever you like.

de⋅sir⋅a⋅ble
–adjective
1. worth having or wanting; pleasing, excellent, or fine.
What I'm trying to find out since you asserted that the 01 is the better ignition is if you know why - not if.

I'm not asking because I know. I'm asking because I'd like an answer - specifically like mentioned above what the timing curve looks like compared to the 00 model.

[250r__Ice]

Dont know what the ignition curve looks like I have never seen it. The info above is stuff that I have read and found on forums and the net and by talking to people and from personal experience. Most people like the 01 ignition because it is suppose to have the better timing curve. You can read this in the post above from the thumper talk link CR250 model year changes. If you read the 2001 model changes this is what it says.("New ignition timing curve".) I dont know if this answers your question. But I hope it helps. If you want specifics on the ignition curve and why the 2001 is better you probable need to talk to a professional engine builder.

[All250R]

Originally posted by 250r__Ice
Dont know what the ignition curve looks like I have never seen it. The info above is stuff that I have read and found on forums and the net and by talking to people and from personal experience. Most people like the 01 ignition because it is suppose to have the better timing curve. You can read this in the post above from the thumper talk link CR250 model year changes. If you read the 2001 model changes this is what it says.("New ignition timing curve".) I dont know if this answers your question. But I hope it helps. If you want specifics on the ignition curve and why the 2001 is better you probable need to talk to a professional engine builder.

A professional engine builder will tell you that there is no such thing as a "better" curve without a specific engine that it resides on. Do you think that Honda discovered a better curve between the years 2000 and 2001? Is that the "info" you're posting here for someone else to read and quote it as "info" like you have? When you originally said it's "more desireable" did you think it was unreasonable to ask you why so that you needed to pass sarcasm and attitude instead of a technical answer to support your observation? If the curve is "new", the engine either was too, or they found something better for the 2001 CR 250 powerplant system - all married to the overall product design objective for that year. Honda isn't that obtuse that they would announce that they found a "better" ignition curve. The people who read sales brochure information as a technical report are not who I'm hoping can tell me why the ignition is better.

Take this for example, is an 09 450 timing curve better than an 01 CR curve? It's 8 years newer according to the year stamp on the frame, so doesn't that mean it's better? If you can answer that, then you can see how it's not smart or "info" to say that one curve is better than another without knowing why. Again, if you didn't catch it before, a curve is better for a particular engine, not all engines or all riders on all forums in all the posts where you happened to read. Does that help you understand my original question better?

[250r__Ice]

Apparently I dont have the answer you are looking for. Sorry to have wasted your time. Have a great day.

[ERBE]

What can you do for ignition up grades if you want to keep your lights??

[Motofool250r]

there are coil upgrades and some cdi upgrades with mixed reviews. cr250 is the best ignition get some battery powered lights from trail tech

[derby]

Here you guys go. The advance values on the y-axis got cut off the graph in the pic but they are as follows 5,10,15,20 degrees of advance BTDC, and of course the x-axis is the rpm.

The top blue green line is the stock 89 250r cdi advance
The green line is the 86 250r advance(I do not know about the 87 or 88 but I suspect them to be the same or really close to either one of these curves)
The white line is the 2000 cr250 curve
The purple line is the 2001 cr250 curve

As you can see there is a difference in the curves. However neither cr250 curve is ideal for any specific application. If I had to choose from the 4 it would be the 2001 cr250 based on looking at the curve from about 5-10,000 rpm. For my riding style mostly dunes it gives me advance as a function of rpm. So as I increase rpm the ignition retards allowing the motor to rev better, faster and higher. If I advanced the timing I would get a slower reving motor but probably have better throttle response. Just a rough scenario but maybe you guys get the idea.

The 2000 cdi as you can see jumps around from 7-10,500 rpm. In the late 90's this was the curve used and it was specific for motors that had a powerjet that was activated by the ignition. The timing jumps had something to do with the amount of fuel being released through the power jet. In 2000 when the ignitions did not have the power jets they decided to remap the curves for 2001.



http://i41.tinypic.com/9lldw3.jpg

[All250R]

Oh very cool information! So the TRX ignitions are flat across the RPM though?

[Buttermilk]

That's what DYNA "says" they are. It is intirely possible that the actual curves from Honda are not what Dyna says they are.

[derby]

The oem 250r cdi advances are really close, I have tested those. The cr250 cdi is really hard to measure but it falls within +-1 or 2 degrees of advance off of dyna's estimates.

[All250R]

Originally posted by derby
The oem 250r cdi advances are really close, I have tested those. The cr250 cdi is really hard to measure but it falls within +-1 or 2 degrees of advance off of dyna's estimates.
That surprises me. I thought there'd be a little more built into those ignitions. You don't need a new CDI to get 88-89 timing if you mechanically move the stator pickup it looks like. Kinda disappointing.

Yea, the 2000 ignition looks specialized for some function occurring where that spike is around peak power. The 01 is probably closest for most engine builds.

I still have a hard time seeing why Honda made a flat ignition curve for the TRX. Maybe that's why the head designs were so watered down, especially in 88-89.

[brandonpeake]

i traded for a 310 esr bike with their cr250 iginition,
is theirs just a just ia kit of hoinda parts u can get from service honda?

Could someone give me a run down on some of the different setups. Id hears the kit was a rip offf that u could buy it yourself from honda in pieces and save alot but ive head there are alot of different tweaks or years of parts to use off the cr250 etc,
can someone post some info to help a 250 newb

[brandonpeake]

i traded for a 310 esr bike with their cr250 iginition,
is theirs just a just ia kit of hoinda parts u can get from service honda?

Could someone give me a run down on some of the different setups. Id hears the kit was a rip offf that u could buy it yourself from honda in pieces and save alot but ive head there are alot of different tweaks or years of parts to use off the cr250 etc,
can someone post some info to help a 250 newb

[Motofool250r]

the ESR kit uses and 2001 cr250r ignition and uses all stock honda parts. with their adapter kit.

the prices on the ESR kit is almost not worth the time to order each individual part, its so close from service honda prices that its easier to get from ESR.