Author Topic: Ignition (Read 46784 times)

T8R6X · « **Reply #15 on:** July 11, 2013, 11:33:04 PM »

I don't know much about this, but is that much advance good?

rsss396 · « **Reply #16 on:** July 11, 2013, 11:35:45 PM »

here is a picture of the BDT flywheel compared to a 2001 CR250 flywheel, BDT's flywheel has a 200 gram weight added to it.
That would make the the bike feel closer to a stock style flywheel but probably still rev quicker since its much smaller diameter

BDT flywheel on the scale

Stock 2001 CR250

Rupp250 · « **Reply #17 on:** July 11, 2013, 11:38:35 PM »

Interesting, thanks for all the info you have added to the site.

mx250r91 · « **Reply #18 on:** July 11, 2013, 11:43:40 PM »

Any idea on why the pulse trigger on that bottom flywheel is so long?

rsss396 · « **Reply #19 on:** July 11, 2013, 11:53:45 PM »

The longer the pulse trigger the larger the spread on the ignition curve can be.
But the cdi can be programed with a shorter spread you just can not go longer than the amount of degrees that the triggers length in crank degrees

Seanoktm found when he switched from a trx250r flywheel to a cr250 flywheel his timing spread shortened 2-3 degrees with his MSD ign because of the shorter trigger length of the CR flywheel.

rsss396 · « **Reply #20 on:** July 12, 2013, 12:27:00 AM »

The motor will have more inertia and less likely to stall but will rev slower but not slower than stock, small light flywheels are a love it or hate it kind of thing.
I think they did good by adding the weight myself but thats me.

sameltoe · « **Reply #21 on:** July 12, 2013, 07:40:26 PM »

http://www.servicehonda.com/cr500-ignition-and-light-coil

Looks like the bdt kit might just be the same as the service honda set up. Flywheel weight and lengthy pick up.
I kinda wish i would have just went this way, now that the cr250 cdi is discountinued...

mx250r91 · « **Reply #22 on:** July 12, 2013, 07:46:35 PM »

Quote from: sameltoe;3281

http://www.servicehonda.com/cr500-ignition-and-light-coil

Looks like the bdt kit might just be the same as the service honda set up. Flywheel weight and lengthy pick up.
I kinda wish i would have just went this way, now that the cr250 cdi is discountinued...

I noticed the same thing. I thought they designed and built their own ignition but it looks like they ripped off service honda's design.

rsss396 · « **Reply #23 on:** July 12, 2013, 07:53:06 PM »

I am sure BDT will deny it, but even the coil wires are setup for a cr500 coil, Jim has to cut the female round plug off and install a female flat blade to go on the CR 250 coil.
No instructions came with it so I just downloaded the wiring diagram from service Honda and magicly they were the same.
It even has a extra coil output wire for a tach like service Honda shows.

It looks like a nice setup none the less and we are going to slot the stator to get the curve where we want it.

sameltoe · « **Reply #24 on:** July 12, 2013, 08:01:31 PM »

But we need to modify the cr250 adaptor plate to work with the 500 stator plate correct?

derby · « **Reply #25 on:** July 12, 2013, 08:34:32 PM »

How much do you plan on advancing at the stator?

rsss396 · « **Reply #26 on:** July 12, 2013, 08:38:10 PM »

We are thinking 4-5 degrees, sometime this weekend I will try to make up a graph showing the 4-5 degrees added at the stator plate.

Derby didn't you say yours started better with a little advance when starting it.

rsss396 · « **Reply #27 on:** July 12, 2013, 08:46:41 PM »

Quote from: sameltoe;3288

But we need to modify the cr250 adaptor plate to work with the 500 stator plate correct?

No the stator plate works with the CR250 stator adapter you get from esr, or others that make them.

2strokesforever · « **Reply #28 on:** July 12, 2013, 09:26:33 PM »

so i can get the ESR adapter plate and this kit http://www.servicehonda.com/cr500-ignition-and-light-coil and it will be a good performace upgrade like the other kits but I will now be able to run lights?

derby · « **Reply #29 on:** July 12, 2013, 09:34:37 PM »

Advancing my setup I thought the bike started up easier. When I was using the programmable dyna fs, I found that if I put the startup timing at 0 degrees the bike was hard to crank. It always seemed that around 7-8 degrees it became much easier. Even with the 01 cr250 ignition advanced up to 6-8 degrees I never did have a problem with kickback. I thought one of the older service honda cr500 ignitions from years ago used a modified cr125 stator and it did not have the groove in the back of the stator plate. But it sounds like, and dave can confirm this, if they use a cr250 stator the groove should be cut in the back of the stator plate and it will bolt right up to the esr plate no mods needed like I referred to earlier in the post.