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Old 10-29-2012, 11:50 PM   #1 (permalink)
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FXR Speedo Broken

Is there any reason an 86 speedo won't work on an 85? They do have different part numbers...
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1985 FXRS: Dyna 2000 ICM, Twin Tec II Single Fire, Mikuni HSR 42mm carb, S&S intake, Progressive 11.5" rear springs, progressive front sprigs, SPF Lightningheader exhaust and bars, rebuilt front forks with brace (lowered back to 25.5"), Arlen Ness fairing, all new electrical, shyt-ton of powder coating etc. etc.
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Old 10-30-2012, 10:27 AM   #2 (permalink)
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Thermodyne is reading this now saying WTF is this? Thermodyne is reading this now saying WTF is this?
As long as the mount type is the same, it should be no issue to swap them. AFAIK the difference is the 85mph requirement.
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Old 10-30-2012, 12:40 PM   #3 (permalink)
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It seems to have th same mount requirements. Just poking around on ebay and all of them are do say "for 86-94," or 84-85.

What is this 85mph speed requirement all about?

Nothing to do with different gear ratio so it will be off?
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1985 FXRS: Dyna 2000 ICM, Twin Tec II Single Fire, Mikuni HSR 42mm carb, S&S intake, Progressive 11.5" rear springs, progressive front sprigs, SPF Lightningheader exhaust and bars, rebuilt front forks with brace (lowered back to 25.5"), Arlen Ness fairing, all new electrical, shyt-ton of powder coating etc. etc.
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Old 10-30-2012, 01:30 PM   #4 (permalink)
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Thermodyne is reading this now saying WTF is this? Thermodyne is reading this now saying WTF is this?
Back in like 79 the feds mandated that speedo's show 85 mph as the maximum reading, along with being more accurate and having 55 being the prominent feature of the scale. The law was repealed, then applied as a rule, and un-applied and re-applied and so on. It caused much confusion as it was mentioned in many tampering regulations. What it did was cause many manufactures to follow the original law, just in case. Not to mention change over production lines. So lots of early to mid 80's speedo's showed 85 as a maximum speed along with 55 being highlighted. As this was also the low point of American performance and also the era of 89 octane only fuel, 85mph was not easily obtained by many of the cars being built, so, few complained.

Today, it's only an issue on an accurate restoration.
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Old 10-30-2012, 01:51 PM   #5 (permalink)
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Wow you learn something new everyday. Thank you.

Both speedos say 120 though. Just don't want to buy one and have it not work on my 85.
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Old 10-30-2012, 03:43 PM   #6 (permalink)
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85 isn't very fast .......
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Old 10-30-2012, 05:22 PM   #7 (permalink)
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This is true. Just need to see why my speedo isn't working.
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1985 FXRS: Dyna 2000 ICM, Twin Tec II Single Fire, Mikuni HSR 42mm carb, S&S intake, Progressive 11.5" rear springs, progressive front sprigs, SPF Lightningheader exhaust and bars, rebuilt front forks with brace (lowered back to 25.5"), Arlen Ness fairing, all new electrical, shyt-ton of powder coating etc. etc.
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Old 10-30-2012, 06:07 PM   #8 (permalink)
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Quote:
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85 isn't very fast .......
yeah, the 8K on the tach is just as overly optimistic as 150mph on the speedo
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Old 10-30-2012, 06:42 PM   #9 (permalink)
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Yeah, the 8K on the tach is just as overly optimistic as 150mph on the speedo
It will rev to 6200 rpm .....
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Old 10-30-2012, 11:57 PM   #10 (permalink)
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I was able to rev my bike up to 8k when it had the screamin eagle ICM on it. Aty least what the tach was showing. haha
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1985 FXRS: Dyna 2000 ICM, Twin Tec II Single Fire, Mikuni HSR 42mm carb, S&S intake, Progressive 11.5" rear springs, progressive front sprigs, SPF Lightningheader exhaust and bars, rebuilt front forks with brace (lowered back to 25.5"), Arlen Ness fairing, all new electrical, shyt-ton of powder coating etc. etc.
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Old 10-31-2012, 12:52 AM   #11 (permalink)
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I was able to rev my bike up to 8k when it had the screamin eagle ICM on it. Aty least what the tach was showing. haha
I'm glad I didn't buy it from you!
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Old 10-31-2012, 02:13 AM   #12 (permalink)
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I have my Dyna ICM coming in the mail soon. What rpm should I set the rev limiter to?
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1985 FXRS: Dyna 2000 ICM, Twin Tec II Single Fire, Mikuni HSR 42mm carb, S&S intake, Progressive 11.5" rear springs, progressive front sprigs, SPF Lightningheader exhaust and bars, rebuilt front forks with brace (lowered back to 25.5"), Arlen Ness fairing, all new electrical, shyt-ton of powder coating etc. etc.
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Old 11-02-2012, 02:52 PM   #13 (permalink)
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I have my Dyna ICM coming in the mail soon. What rpm should I set the rev limiter to?
I don't think I would want mine to go any higher than 6200 if everything in the motor is fairly stock.
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Old 11-03-2012, 11:01 PM   #14 (permalink)
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Set it for 6k.
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1985 FXRS: Dyna 2000 ICM, Twin Tec II Single Fire, Mikuni HSR 42mm carb, S&S intake, Progressive 11.5" rear springs, progressive front sprigs, SPF Lightningheader exhaust and bars, rebuilt front forks with brace (lowered back to 25.5"), Arlen Ness fairing, all new electrical, shyt-ton of powder coating etc. etc.
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