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Old 08-17-2009, 01:32 PM   #1
zoo mob OP
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Time to replace coils R80rt OEM or aftermaket?

I need to replace the coils on my 1987 R80rt, as the housing is cracked and they are arcing. Any thoughts on whether I'm better off with oem bosch coils or something aftermarket like Dyna?
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Old 08-17-2009, 01:46 PM   #2
datchew
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look at the harley coil in the dark secrets thread (above).
They're only around $30 and they work well. Field tested and approved by old school adv inmates.

There's really no sense in buying genuine BMW parts for a consumable item like a coil. Dyna's are nice, but pricey.

Here's a picture:



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Old 08-17-2009, 04:25 PM   #3
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Quote:
Originally Posted by zoo mob
I need to replace the coils on my 1987 R80rt, as the housing is cracked and they are arcing. Any thoughts on whether I'm better off with oem bosch coils or something aftermarket like Dyna?
you do mean coil as in singular don't you?
I have never seen two coils on a post 85 airhead.
K100 early (2 valve ) coil also works.
R
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Old 08-17-2009, 07:30 PM   #4
zoo mob OP
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Yeah, its a single coil, would the harley coil work, and do you have a part number?
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Old 08-17-2009, 07:58 PM   #5
datchew
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Quote:
Originally Posted by zoo mob
Yeah, its a single coil, would the harley coil work, and do you have a part number?
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Old 08-17-2009, 11:52 PM   #6
zoo mob OP
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forgive my less than thorough reading of your prior post, I'll be picking up or ordering one from the Harley dealer first thing tomorrow.
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Old 08-18-2009, 05:15 AM   #7
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Quote:
Originally Posted by zoo mob
forgive my less than thorough reading of your prior post, I'll be picking up or ordering one from the Harley dealer first thing tomorrow.
You're in fine form bro. I do the same thing... actually, I'm probably worse.

You should know that the wire connections to the harley coil are different than those of the OEM coil. You can trim off the ends and crimp on loops, or make short little "converter" leads out of spare wire if you don't want to modify your stock wiring harness.

Also, the bracket is different. many of us (myself included) just zip-tie them into place, but some get fancy and bend a piece of sheet metal and make their own little bracket.

Remember the dielectric grease.
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Old 08-18-2009, 11:36 AM   #8
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You can probably get one used for CHEAP because Harley guys play with that stuff right out of the box.
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Old 08-18-2009, 01:37 PM   #9
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Don't go with anything "special", use standard Bosch GT40T coils, like this on my '84 R65LS.

Since the standard (grey) coil was replaced, badly cracked and hydrophobic like all buggery, the bike starts easier, and runs very well.

A mate did the same deal on his '93 GSPD, and found the starting greatly improved, and runing (subjectively) improved.

The main point is these coils are available anywhere, not just in motorcycle shops.
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Old 08-18-2009, 02:25 PM   #10
zoo mob OP
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Got the Harley coil, what plug wire goes to what side, and what electrical wire to what side? Thanks, I'm now inches away from getting this thing running for the first time during my time owning it!
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Old 08-18-2009, 02:37 PM   #11
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Your plugs go to the terminals in the holes (doesn't matter which ones go where) and the other wires that powered your old coil get connected to the threaded posts, black wire to the negative pole if they're marked. Polarity may not matter though.
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Old 08-18-2009, 03:09 PM   #12
zoo mob OP
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No markings, here goes nothing, we'll see.
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Old 08-18-2009, 07:17 PM   #13
datchew
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No markings. I don't think it matters.

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Old 04-11-2011, 02:49 PM   #14
MightyManfred
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I'm a new inmate - been riding off and on since 1969. I am 2 and half years into being an airhead owner and think the coil on my 1987 R80RT needs replacing. I have one of the Harley coils shown above - 31614-83. This coil is rated at 3 or 3.5 ohms, whereas my bike is supposed to have one rated at 1.5.

I know having lower resistance can ruin components. What risk does have higher resistance carry?
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Old 04-11-2011, 03:00 PM   #15
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Quote:
Originally Posted by MightyManfred View Post
I'm a new inmate - been riding off and on since 1969. I am 2 and half years into being an airhead owner and think the coil on my 1987 R80RT needs replacing. I have one of the Harley coils shown above - 31614-83. This coil is rated at 3 or 3.5 ohms, whereas my bike is supposed to have one rated at 1.5.

I know having lower resistance can ruin components. What risk does have higher resistance carry?
I would stick with the correct one, 1.5 amps. or thereabouts.
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