1986 Formula MX Attempting to add Electric Start

548 Views 17 Replies 6 Participants Last post by chriswy27, 6 d ago

chriswy27

Discussion Starter · 18 d ago

I'm attempting to perform an electric start retrofit on my '86 PRS sled. The parts seem very hard to come by but at this point I think I've collected most of them. Mostly want to ask, is there anything I am completely overlooking? Below is the parts I've acquired. I think I have pretty much everything minus the battery. My only question is which ring gear to use.

From a couple different '91 PRS Sleds:

* Clutch Part# 417202100 : My '87 clutch didn't have the posts to mount a ring gear. Looks like despite having the posts that this one never had a ring gear installed either as the holes are not tapped. I was worried at first but then read the screws are self tapping.

* Ring Gears Part #414807500 & Other Part# 414604300 (maybe)?: Below are two different styles and I'm not sure which one I should use. The right one looks like images I've seen online and comes with the Phillips head self-tapping screws which I believe are part# 309903100. The left one I think was the newer replacement once the right was marked NLA by skidoo and looks to use hex head screws part# 732601120. Any idea which gear I should go with?

* Startor & Engine mounting bracket:

* Wire Harness from a 91 sled with E-start: I believe the missing "pins" marked 1, 3, etc. from the large 8-pin connector are the ones coming from my stator but I'll have to compare my'87 harness there.

* Ignition w/ E-Start

* Voltage Rectifier

Just want to say that I wouldn't have been able to get this far without Hudson's Sled Salvage awesome parts diagrams w/ oem numbers. Anyhow, am I nuts to attempt this? Will something I've purchased not work the way I think it will? Thanks!

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David H

· #4 · 16 d ago

Looks like a good start.
What's your plan for drilling out the ring gear mount holes? I would think this would have to be done perfectly for balance purposes.
Here's an 86 shop book on pdf.

https://vintagesnow.com/Ski-Doo_files/1986_Ski-Doo.pdf

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David H

· #6 · 16 d ago

alainm said:
The holes are already on the clutch

Got it. Missed that part.

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David H

· #10 · 14 d ago

chriswy27 said:
Now just have to decide which ring gear I should be using.

I agree with your earlier comment that the 7500 is simply the replacement for the earlier ring gear. Looks like it was used into the late 90's at least. I would go with that.
As for the fasteners I believe either fastener will work with either gear but given the choice I'd use the hex head.
Good luck.

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