MSD TL testing

[masterblaster]

how in the world would it fire both cylin together at the same time? being a 2 cylin 2 stroke ones gotta fire sep from the other.I know some 4 and 6 cylin motors batch fire? but a 2 cylinder

I have a ign just like this one I need to rewire as well,the instructions are not on msd site anymore,does someone have the pdf they could email me?

 

[crammit442]

how in the world would it fire both cylin together at the same time? being a 2 cylin 2 stroke ones gotta fire sep from the other.I know some 4 and 6 cylin motors batch fire? but a 2 cylinder

All yamaha and Kawi ignitions prior to the latest MSD TL use a waste fire system. Even the stock systems fire both plugs at the same time. They're 180 deg apart so one doesn't interfere with the other. The newest multi channel MSD TL is a sequential fire system.

 

[masterblaster]

hmm that makes sence,there are only 2 wires comin back from the stator on this thing,I wouldnt have guessed the stock ign would do that though.seems dangerous to me

 

[D-Roc]

you may need a bit more time to get some better piston wash. do you happen to know what kind of timing curve it is running or what chip module/s you have?

 

[coldblaster]

I am new to TL how do I check my curve or chip. I can't find any info on the old #4270 on MSD website.

 

[D-Roc]

well that could be a problem. you really need to get the instructions, hopefully someone on here still has them. There are guys on here that have run these ignitions so they might chime in and give you an idea of what chips (different chips for different retard rates/rpm limit) to look for and what kinda curve you can try and run on your setup. list your engine setup and your pump combo for the guru's to get an idea. maybe try 28 degrees static. If it was way advanced and you retarded it to 30 and it still backfires a bit go a little more see if it helps. I thought Watcon.com had some of those old chips still but that could be dated info.

 

[Mouthfulloflake]

Paul Lehr ( LPW ) faxed me some analog MSD TL instructions years ago..

You might ask him for help.

 

[Matt_E]

Ok timing was way off... like 20 degrees adv too far... it is now set at 30 deg at close to idle. still backfires a bit. I noticed my motor must be out of alignment because the coupler was heating up. Here is a pic of the pistons now. Both heads were very wet, the front looks good I don't know about the pto still???

It's normal for the couplers to get warm, especially out of the water.

 

[Matt_E]

hmm that makes sence,there are only 2 wires comin back from the stator on this thing,I wouldnt have guessed the stock ign would do that though.seems dangerous to me

Why is it dangerous? :dunno:

The off-cylinder doesn't have any a/f mix in the chamber at BDC.

 

[masterblaster]

just seems like it would be more likly to cause issues,with detonation at high rpm or low octane fuel,air leaks and such.live and learn