lobre87 
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« on: April 03, 2011, 08:16:15 AM » |
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So i bought my bike knowing the tach wasnt working, was curious if this is a common occurrence on these bikes...if so would it be easier just to repair or replace? i looked for oem tach assembly and its like 450 or so which is out of my price range. Are there any aftermarket tachs that suit my bike because all the ones which i have found do not come with indicator lights
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'92 CB750 Nighthawk
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windrider
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2000 750 Nighthawk
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« Reply #1 on: April 03, 2011, 08:40:19 AM » |
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search for Tach Repair. A couple of threads here on what is wrong and how to fix it. Warning, you need to be as steady as a surgeon, and skilled with a soldering iron.
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My wife rides a Yamaha 650 V Star Classic
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lobre87
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« Reply #2 on: April 03, 2011, 09:18:49 AM » |
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thank you i will look into it
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'92 CB750 Nighthawk
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drdubb
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« Reply #3 on: April 03, 2011, 05:52:26 PM » |
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Dance as if no one is looking.
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lobre87
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« Reply #4 on: April 04, 2011, 09:56:04 AM » |
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thanks guys i did the tach repair yesterday...it was a b!tch but the tach now works...any idea whereabouts the idle is supposed to be at for my 92.
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'92 CB750 Nighthawk
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TDodge7
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« Reply #5 on: April 04, 2011, 10:08:28 AM » |
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1100 +/- 100rpm is pretty much the standard setting for most 4 cylinder bikes
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1984 Honda Nighthawk CB700S
1971 Triumph Bonneville T120RV
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sleepycow
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« Reply #6 on: April 04, 2011, 10:54:55 AM » |
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How long did it take you?
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lobre87
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« Reply #7 on: April 04, 2011, 12:25:54 PM » |
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1100 +/- 100rpm is pretty much the standard setting for most 4 cylinder bikes okay so im about +500 off which im okay with im just glad its working How long did it take you? about 2 hours roughly im sure if i knew exactly what i was doing i would have been able to cut that time in half, the difficult part was soldering the top spring which is the initial problem. the coils are so close together and i had such a large gun that i soldered two coils together so then i had to rewind and do it over. it was also a pain to make sure i didnt bridge between the post that the coil goes on and the brass piece in the center. i wish i would have taken pictures while i was doing it but my camera wasnt charged  but if you know what you are doing and looking for it shouldnt be that difficult |
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'92 CB750 Nighthawk
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tbante
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« Reply #8 on: April 04, 2011, 01:20:36 PM » |
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My hat is off to you sir! I found it to be very frustrating with the little pieces etc etc. It took me considerably longer than 2 hours. It probably took me that long just to get the tach off the bike and disassembled so that I could see the little springs.
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'Tom'
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pw363
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« Reply #9 on: April 05, 2011, 08:47:17 PM » |
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okay so im about +500 off which im okay with im just glad its working
is your idle speed off by 500 or is your tach off by 500? if the tach is off you can carefully remove the needle and reposition it on the shaft to adjust it. I had to do that after repairing mine. Seems like my repair took 2-3 hours and was a bit%h as well. I needed better eyes and an extra hand and a smaller soldering iron. congrats you did good.
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hppants
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« Reply #10 on: April 06, 2011, 06:37:06 AM » |
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There's a way to use a Digital Voltmeter to give you a rough tachometer reading. I remember seeing Cherrybomber use his DMM to sync Popo303's carbs in Texas last year. I can't remember the details, though.
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2005 FJR1300
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Workrider
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« Reply #11 on: April 20, 2011, 10:37:58 PM » |
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If my tach ever burns out i'm just daring enough to try this fix before buying one. haha. Just a note. If your tach gets funky on ya in the future the shop manual says the tach is connected to piston 2&3 coils/ignition. If they give you trouble at any point thats something i'd check as well. :-)
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Do it right, the first time. You will thank yourself!
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