Msd 4270 total loss

Sasquachcrap · Jun 30, 2014

Can someone tell me where to get an instruction manual for my MSD total loss system? It is a 4270. Also what what Wouls a toggle switch on the side of the ski do for the total loss? I am very new to this system and it was on a ski that I recently purchased.

hink320 · Jun 30, 2014

The toggle switch probably turns power on to the total loss. You can find instructions on http://www.msdpowersports.com/

Sasquachcrap · Jun 30, 2014

Well who would have thought to just go straight to the msd site!

Sasquachcrap · Jun 30, 2014

Well the model 4270 isn't available electronically. Well not threw them so might any one have a PDF copy they could email me or give me another option.

augustaf · Jun 30, 2014

the instructions consist of 11 pages plus one addendum describing the start retard delete of the later model 4270P, hopefully that exists somewhere.

Sasquachcrap · Jun 30, 2014

Well my question is would it be better installed on a freestyle ski over and MSD enhancer? It has an 8000 RPM limit module and a 2° per 1000 retard module. I can remember where it starts to pull timing at. I'm just guessing that's what all the modules do let me know if I'm wrong.

augustaf · Jun 30, 2014

retard probably starts at 4500 (as it should). An enhancer only gives you about 3 degrees advance, while that is better than stock, it pales to the performance increase with total loss

Sasquachcrap · Jun 30, 2014

If it starts at 4500 am I correct in saying that at 2° /1000 puts me at -7° at 8000. Set at 32° it would fall off to 25°. Can someone give me a quick lesson in what an ideal setup would be with what I have or what I might need to get.

augustaf · Jun 30, 2014

32 deg advance is a bit radical. I used to run 28 deg. initial with that unit. Your math is correct. 3 deg./ 1000 plug in modules can be found. These modules have a single resistor inside. You can make them yourself if value known. At high rpm you need to be well below 20 deg

Sasquachcrap · Jun 30, 2014

With a 3° per thousand module would you start retarding at a higher RPM. And is 17 or 18 degrees safe at 8000

augustaf · Jun 30, 2014

No! You need to start retarding at 4500 regardless of plug in module. Dyno tests have shown that about 16 deg @ 8000 is ideal. 17 or 18 would be fine, after all stock cdi is about 20 deg all the time. Your engine will never reach 8k as long as the impeller is in the water, racers just set the limit that high so they don't loose valuable rpm in chop

Sasquachcrap · Jun 30, 2014

Thanks for all the info. I just got home and checked the low limit is 5000. Is that to high or should I replace it with a 4500?

augustaf · Jul 1, 2014

Depends. Please, consider searching links about timing curves, MSD or ATP. ie: http://www.x-h2o.com/index.php?threads/msd-total-loss-curve-suggestions.20015/
I've copied a page from 1993 MSD instructions (weird)