Author Topic: Flywheel Shutter Strap (Read 8899 times)

C-Leigh Racing · « **Reply #15 on:** September 23, 2013, 12:38:18 PM »

So even with the stator plate locked down at full retard, the timing is still around 16* advanced ?.
Now is it 16* advance at idle ?, if so, what in the world is it going up to as the rpms go up.

Kinda looks like, we need to machine slots in the adapter plate so that can be adjusted as well.
Neil

F-Red · « **Reply #16 on:** September 23, 2013, 01:05:02 PM »

Quote from: rsss396;12824

Your picture shows 15, but the angle you took the picture can show at least 1 degree difference, especially without a pointer right next to the flywheel.
try advancing the stator now and check you timing.

When this timing tape was drawn, the incremental numbers are by 5*. The number 15* is really 20*. The engine is idling @ almost 20* advanced.

Quote from: C-Leigh Racing;12862

So even with the stator plate locked down at full retard, the timing is still around 16* advanced ?.
Now is it 16* advance at idle ?, if so, what in the world is it going up to as the rpms go up.

Kinda looks like, we need to machine slots in the adapter plate so that can be adjusted as well.
Neil

You are correct Neil. But when I rev the engine up, it will retard by 5* Assuming the CDI is retarding, with increased RPM's.

C-Leigh Racing · « **Reply #17 on:** September 23, 2013, 01:28:36 PM »

So as you rev its dropping back to 16* advance.

I really think, as I've said before, I think those CR250R ignition adapter plates, are machined with the intent of being used on an alky engine, because of only being a hole drilled in for the mounting bolts with advance already being in their location.
The adapter plates that CT Racing offers, have slots for the mounting bolts for even more adjustment.
Neil

rsss396 · « **Reply #18 on:** September 23, 2013, 01:56:30 PM »

Just for reference my bone stock 1988 250r idles at 3000 rpm according to my timing light with rpm display

you really need some sort of rpm to cross reference, and are you positive the tape markings are correct? do you have a degree wheel that you can double check the timing tape?

F-Red · « **Reply #19 on:** September 23, 2013, 02:47:30 PM »

Quote from: C-Leigh Racing;12866

So as you rev its dropping back to 16* advance.

I really think, as I've said before, I think those CR250R ignition adapter plates, are machined with the intent of being used on an alky engine, because of only being a hole drilled in for the mounting bolts with advance already being in their location.
The adapter plates that CT Racing offers, have slots for the mounting bolts for even more adjustment.
Neil

Yes, the timing drops back to 15-16* advanced, when reved moderately. I'm tending to believe the same thing, about the ESR adapter plate. I read on some micro sprint forum, these guys are using the ESR plate, no adjustment and running alcohol.
Is the CT Racing plate, the RPM brand? CT's site does not show that adapter plate for purchase.

Quote from: rsss396;12869

Just for reference my bone stock 1988 250r idles at 3000 rpm according to my timing light with rpm display

you really need some sort of rpm to cross reference, and are you positive the tape markings are correct? do you have a degree wheel that you can double check the timing tape?

Dave, that sounds high for idle. My timing light doesn't show rpm's. I can be pretty sure, mine is not idling that high. The tape is correct. Triple checked, degrees are .0258" increments. Drawn in SolidWorks.
Besides the magic number of degrees advanced, it is clearly advanced more than the ideal 0-5* Why? Is it a possible the CDI module, could be failing?

rsss396 · « **Reply #20 on:** September 23, 2013, 04:36:14 PM »

Not sure, you could send it to me and I can spin it on my tester and see how it compares to mine that I have tested.
just pay for shipping both ways

C-Leigh Racing · « **Reply #21 on:** September 23, 2013, 11:32:38 PM »

Humm, you got me on the CT adapter plate David, cause I always thought they were a CT product.
I'll have to check my old old CT catolog & see what it list them as.

Something I did learn about the ignitions, when you have an intermited ground, it causes the ignition to go crazy & start over, just like when you first started the engine up & at idle, so the timing will be advance real high cause it thinks the engines idling, until the pick up coil tells the CDI box different, so clean all those contact points, bolts & screws.
Neil

F-Red · « **Reply #22 on:** September 24, 2013, 06:44:46 AM »

Quote from: rsss396;12883

Not sure, you could send it to me and I can spin it on my tester and see how it compares to mine that I have tested.
just pay for shipping both ways

Thanks for the offer. I hope I can solve the issue, a little closer to home.

Quote from: C-Leigh Racing;12907

Humm, you got me on the CT adapter plate David, cause I always thought they were a CT product.
I'll have to check my old old CT catolog & see what it list them as.

Something I did learn about the ignitions, when you have an intermited ground, it causes the ignition to go crazy & start over, just like when you first started the engine up & at idle, so the timing will be advance real high cause it thinks the engines idling, until the pick up coil tells the CDI box different, so clean all those contact points, bolts & screws.
Neil

I will check those connections.
Here's a picture of the pickup coil, on the timing tab @ TDC.

rsss396 · « **Reply #23 on:** September 24, 2013, 06:53:09 AM »

Quote from: C-Leigh Racing;12907

Humm, you got me on the CT adapter plate David, cause I always thought they were a CT product.
I'll have to check my old old CT catolog & see what it list them as.

Something I did learn about the ignitions, when you have an intermited ground, it causes the ignition to go crazy & start over, just like when you first started the engine up & at idle, so the timing will be advance real high cause it thinks the engines idling, until the pick up coil tells the CDI box different, so clean all those contact points, bolts & screws.
Neil

I don't have the ct adapter, I have heard of them but have never seen one.

rsss396 · « **Reply #24 on:** September 24, 2013, 06:55:00 AM »

Quote from: F-Red;12917

Thanks for the offer. I hope I can solve the issue, a little closer to home.

I will check those connections.
Here's a picture of the pickup coil, on the timing tab @ TDC.

That pickup looks pretty close to the flywheel tab, usually .015" is about right

F-Red · « **Reply #25 on:** September 24, 2013, 07:00:56 AM »

I'll measure that gap tonight. Thanks guys for your help. There is not anybody in my area, that has a clue about the 250R. I'm on an island. :sour:

rsss396 · « **Reply #26 on:** September 24, 2013, 08:55:02 AM »

well where you are at in timing is fine, so what are you exactly going after?
I know you had some issues with your esr cylinder and a few of us had recommended some water flow improvements did you attempt any of those changes?

Also what kind of timing light are you using?

F-Red · « **Reply #27 on:** September 24, 2013, 09:06:58 AM »

All I ever hear is, 4-7* advance, 10* max. Is this at full RPM? I'm idling @ 20* Your chart that you posted, indicates I'm fine. I'm a little gun shy, if you know what I mean.
Yes, I hogged out the water passages and running Engine Ice. I'll post some pictures on the ESR cylinder thread, I started. My timing light is a battery powered, nothing fancy brand.