250-500cc Tell me about the CR ignition on your WR250/300

Anybody here from Belgium ? Somebody needs to contact HPI and see what they could do for us. I'd say one of their primary people could probable answer all these questions and set us up with OE type stuff for the WR's. Seems like they've got about everything.

There is a couple guys in the vintage section from France maybe they could help. I'll pm one of them.

Here is a shot of the 2012 stator. I wasn't sure what all you wanted to see. I've got it sitting on the kitchen table right now, so I can take more pictures pretty easily.

And as far as referencing those technical specs on PVL's site for the rotor on the PVL system. The rotor part number is not listed on that page, so I'm going to go back out to the garage and grab the caliper so I can try to get the taper specs for you.

The taper is roughly 13mm on the small side and 15mm on the large side, and they are approximately 19mm apart. My caliper is in inches, so conversion has everything pretty well approximate, but the measurements fit pretty near the sweet spots.

Interesting. I had not seen one of the newer Ducati units. Just three leads coming off it?

The taper sounds just like all the others. Nothing different there.

You got a snapshot of the wiring diagram? I've not been able to track one down.

I'd fire my bike up and put a meter on it, but I am a couple thousand miles away from it right now.

That being said, I'm in the UK so maybe I should pop into Belgium while I'm here and talk to HPI.

I was just looking at the links msmith posted.

Yeah, if you're already that close, then swing by.

After further investigation I'm liking the Yamaha YZ flywheels for a possible fit. Very small on the tapper end. Might have to get one in just to check it out.

1999+ YZ250 ignitions would be a good fit as far as the mapping goes, too.

Wiring diagram is here in the shop manual (page 297 if your PDF viewer isn't compliant with short cuts)

Which year YZ250? I'm seeing that the crankshaft taper changed to a larger one between 02 and 03.

A YZ250 setup would be great, would be no problem finding one of those setups for a good price.

Yeah, I was looking at '99 to '01. Found a bunch of them on ebay.

Motor, according to the hpi specs the wr has a 18.80km crank with a 4 degree taper and the yz 15.150km with 5.5 degree taper. But the husky has the same spec as the 1996 KTM 250 sx.

18.80MM X 4DEGREE TAPER ON THE HUSKY. 15.50MM X 5.5 DEGREE ON THE YAMAHA. DAMN AUTO CORRECT PHONE.

That figures. The one I got was from a 1997 250SX.

so not being a machinist is the Yamaha bore in the mag smaller? if so can it be bored to the correct size and taper?

Looks like it.

A 1996 250 sx has the same measurements but uses a sem ign.

Dumb question, but what is stopping us from running some other bike's CDI with the WR stator/rotor? If they're all AC, is the only thing that matters the location (degrees) of the timing signal? Or is there a complication I am not seeing?

I think the wr motor runs in reverse.

I don't know anything about dirt bike ignitions, but I assume the ignition box won't know which direction it's turning as long as it gets the proper signal or pulses. The pickup needs to provide the same signal the ignition box needs.

You would have to find a bike that runs the same type of trigger and an equal trigger length. And it would have to have the same mechanical dimensions as the WR so the timing curve would work with the engine.

I personally don't know of a bike that runs a system like the WR. Especially the newer Ducati units.