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Old 03-11-2017, 09:56 AM
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FJ111200 FJ111200 is offline
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What RPM for Midnight

Well I've got my '81 LH Midnight up and running, carbs have got all standard jetting though i'm running with 120 mains across all four.
Headed off on the motorway, you lads might call it the freeway, and got up to 75mph and the rev counter is at 5500 rpm.
It seemed a bit high considering my previous XS's were at about 4000 rpm for the same mph.
Does it seem right for a Midnight?
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Old 03-11-2017, 01:02 PM
motoman motoman is offline
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All XS1100 series had same tranny gearing and same stock final drive gearing. With that said, at approx. 4,000rpm in fifth gear is 60-62mph. Those rpm's are a tad lower at same speed with the Standard, as it uses the 17inch rear wheel as opposed to the 16inch rear wheel of the Specials and Midnite Specials.
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Last edited by motoman; 03-11-2017 at 01:07 PM.
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Old 03-11-2017, 01:33 PM
Ranger_xs1100 Ranger_xs1100 is offline
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rpm

An rpm test I did before and after the XS850 final drive swap on my 1980 XS1100LG (MNS)

with XS1100 stock final drive:

3000 rpm = 45mph

3500 rpm = 52mph

4000 rpm = 59mph

After XS850 final drive swap:

3000 rpm = 52mph

3500 rpm = 59mph

4000 rpm = 66mph

All readings were in 5th gear of course.
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Last edited by Ranger_xs1100; 03-11-2017 at 01:40 PM.
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Old 03-11-2017, 01:39 PM
motoman motoman is offline
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BTW, interesting pattern done on the re-covered seat. Even more interesting, considering your location, as to how that Midnight Special came into your possession?
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81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top.
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Old 03-11-2017, 02:51 PM
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IanDMacDonald IanDMacDonald is offline
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Yes, it seems too high. Average for any of my XS bikes is 4900-5k rpm's @ 75mph.
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2H9 Mod, Truck-Lite LED Headlight, TECHNA-FIT S/S Brake Lines, Rear Air Shocks, TKAT Fork Brace, Dyna DC-I Coils, TC Fuse Block, Barnett HD Clutch Springs, Superbike Handlebars, V-Star 650 ACCT, NGK Irridium Plugs, OEM Exhaust. CNC-Cut 2nd Gear Dogs; Ported/Milled Head; Modded Airbox: 8x8 Wix Panel Filter; #137.5 Main Jet, Viper Yellow Paint, Michelin Pilot Activ F/R, Interstate AGM Battery, 14MM MC, Maier Fairing, Cree LED Fog Lights.
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Old 03-11-2017, 02:54 PM
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FJ111200 FJ111200 is offline
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OK, so 5500 rpm at 75 mph could be about right, unless anyone else knows better.

Regarding the seat pattern, that was how it came with the bike and the bike came to the UK in 1997 according to the V5C, which is the UK registration documentation every UK owner has, and seems like quite a late import. But that doesn't mean anything really as bikes are imported here all the time.
But thanks for the replies from everyone, as I was thinking the timing was a tooth out since I replaced the camchain and tensioner for new and a VMX ACCT.

It's great to ride though with those MX 'bars, it's easy to throw around and considering the 37mm forks quite stable.
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Old 03-11-2017, 02:55 PM
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Quote:
Originally Posted by IanDMacDonald View Post
Yes, it seems too high. Average for any of my XS bikes is 4900-5k rpm's @ 75mph.
Maybe my speedo is off as well
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Old 03-11-2017, 04:24 PM
Eveready1100 Eveready1100 is offline
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If these pics are any help to your question, mate.
Bike is a 79SF with the 16 incher running an Avon Roadrider 130/90-16



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  #9  
Old 03-11-2017, 04:53 PM
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IanDMacDonald IanDMacDonald is offline
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Quote:
Originally Posted by Eveready1100 View Post
If these pics are any help to your question, mate.
Bike is a 79SF with the 16 incher running an Avon Roadrider 130/90-16



Holy cow!!! 3500k @ 75mph??? You must get awesome fuel mileage on that bike!!!!
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1979 XS1100F
2H9 Mod, Truck-Lite LED Headlight, TECHNA-FIT S/S Brake Lines, Rear Air Shocks, TKAT Fork Brace, Dyna DC-I Coils, TC Fuse Block, Barnett HD Clutch Springs, Superbike Handlebars, V-Star 650 ACCT, NGK Irridium Plugs, OEM Exhaust. CNC-Cut 2nd Gear Dogs; Ported/Milled Head; Modded Airbox: 8x8 Wix Panel Filter; #137.5 Main Jet, Viper Yellow Paint, Michelin Pilot Activ F/R, Interstate AGM Battery, 14MM MC, Maier Fairing, Cree LED Fog Lights.
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Old 03-11-2017, 04:56 PM
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IanDMacDonald IanDMacDonald is offline
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If that's the case, I need to swap to a 16" rear wheel!
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1979 XS1100F
2H9 Mod, Truck-Lite LED Headlight, TECHNA-FIT S/S Brake Lines, Rear Air Shocks, TKAT Fork Brace, Dyna DC-I Coils, TC Fuse Block, Barnett HD Clutch Springs, Superbike Handlebars, V-Star 650 ACCT, NGK Irridium Plugs, OEM Exhaust. CNC-Cut 2nd Gear Dogs; Ported/Milled Head; Modded Airbox: 8x8 Wix Panel Filter; #137.5 Main Jet, Viper Yellow Paint, Michelin Pilot Activ F/R, Interstate AGM Battery, 14MM MC, Maier Fairing, Cree LED Fog Lights.
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  #11  
Old 03-11-2017, 05:10 PM
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IanDMacDonald IanDMacDonald is offline
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I'll just come-out and say that the tach or speedo is off. No way are those readings right!
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1979 XS1100F
2H9 Mod, Truck-Lite LED Headlight, TECHNA-FIT S/S Brake Lines, Rear Air Shocks, TKAT Fork Brace, Dyna DC-I Coils, TC Fuse Block, Barnett HD Clutch Springs, Superbike Handlebars, V-Star 650 ACCT, NGK Irridium Plugs, OEM Exhaust. CNC-Cut 2nd Gear Dogs; Ported/Milled Head; Modded Airbox: 8x8 Wix Panel Filter; #137.5 Main Jet, Viper Yellow Paint, Michelin Pilot Activ F/R, Interstate AGM Battery, 14MM MC, Maier Fairing, Cree LED Fog Lights.
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Old 03-11-2017, 05:11 PM
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BA80 BA80 is offline
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Either your tach or the speedo is wrong. I'm guessing the speedo.
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80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

The list changes.
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Old 03-11-2017, 06:27 PM
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3Phase 3Phase is offline
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Hickory Dickory Dock

It looks like the tip of the needle is missing in the speedometer.

If the needle's too light it would read faster than it should when the mouse ran 'up' the clock, then slow a little after the clock struck 12 and the mouse ran 'down' past 120 KPH.
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1982 XJ1100J: "Baby" SS Brakes, '850 FD, ACCT
1980 XS1100G: "Columbo" SS Brakes, '850 FD, ACCT
1979 XS1100SF: "Bush" W.I.P.
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  #14  
Old 03-12-2017, 02:45 PM
motoman motoman is offline
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Quote:
Originally Posted by 3Phase View Post
It looks like the tip of the needle is missing in the speedometer.

If the needle's too light it would read faster than it should when the mouse ran 'up' the clock, then slow a little after the clock struck 12 and the mouse ran 'down' past 120 KPH.
Conclusion of speedo incorrect or no longer working.......replace the mouse.
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81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top.
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  #15  
Old 03-12-2017, 03:16 PM
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3Phase 3Phase is offline
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Thumbs up

Quote:
Originally Posted by motoman View Post
Conclusion of speedo incorrect or no longer working.......replace the mouse.
Perzactly!

You can also try to open up the clock to repair, replace and recalibrate or just get another clock.
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1982 XJ1100J: "Baby" SS Brakes, '850 FD, ACCT
1980 XS1100G: "Columbo" SS Brakes, '850 FD, ACCT
1979 XS1100SF: "Bush" W.I.P.
2018 Heritage Softail Classic 117 FLHCS SE: "Nanuk"
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