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09-25-2008, 6:50 PM Scottie_116 Joined on 03-17-2008 Brisbane, Queensland Posts 31 Speedo and tacho ratio? I'am sure that i've seen this before some where but as we all know the search function doesn't work.  So i was just wondering wat the ratios were for the speedo and tacho? thanks    Report

10-04-2008, 2:27 PM DanInOregon Joined on 07-02-2008 Cornelius, Oregon Posts 80 Re: Speedo and tacho ratio? Same line, but different question: Will a 78 CX500 tach have the correct ratio for an 83 CX650? my 650 tach died and I have a 78 on the table...    Report

10-04-2008, 7:08 PM Blindstitch2002 Joined on 05-16-2007 Greenfield Wisconsin Posts 5,000 Re: Speedo and tacho ratio? I don't see why not. 1978 Honda Cx500 Maggot 1979 Honda Cx500 Custom 1980 Cx500 Deluxe Buy HTTA Items Quick Reference Info    Report

10-04-2008, 7:25 PM N.W.OhioNomad Joined on 05-31-2008 Archbold,OH Posts 81 Re: Speedo and tacho ratio? Speedo ratio is 2240=60mph. Most vintage hondas have the same tach ratio.I think its 1:4 but not sure. Hey Blindstitch did you see the 120mph speedo on the "bay" ,maybe one for your collection. 1981 cx500c "silver bullet" "Its better to be hated for what you are than loved for what you are not" -carpy carpenter    Report

10-04-2008, 8:13 PM Blindstitch2002 Joined on 05-16-2007 Greenfield Wisconsin Posts 5,000 Re: Speedo and tacho ratio? Really. I didn't see it. I let a 0-85 with 14,000 miles on it go the other day for $10 plus shipping because I figured that person probably needed it more than I did. At one time I was going to build a lamp out of the speedos. I had a real crazy design where the on off switch was a trip knob. It was kind of bug eyed but then I moved and lost the 4 broken bodies I had. I'm still trying to get use to only seeing up to 85mph. It's just not fair. I think the 0-120 matches the looks of the tach better since 60mph is straight up like 6,000 rpms. 1978 Honda Cx500 Maggot 1979 Honda Cx500 Custom 1980 Cx500 Deluxe Buy HTTA Items Quick Reference Info    Report

10-04-2008, 9:04 PM CXSarnia Joined on 01-11-2008 Sarnia, Ontario, Canada Posts 2,623 Re: Speedo and tacho ratio? I replaced mine with one from a CB900...now my bike can go 200 mph!  2009 DN-01 Spakin' New! 1982 CX500 Turbo & Parts bike 1981 SL185 Yamaha Exciter 198? V45 Magna 1979 CX500 Deluxe 1982 CB750K Daily rider September 1999 1982 CX500 Custom - project Originally bought April 1982 safetied and on the road 09/2008    Report

10-04-2008, 9:12 PM Blindstitch2002 Joined on 05-16-2007 Greenfield Wisconsin Posts 5,000 Re: Speedo and tacho ratio? 200mph. That's got to be what 300kph. Now that's fast. Watch out moose in ontario are every 3k according to the night danger signs. I wonder how hard it would be to adapt a speedo from a aircraft. Now that would be fast. All you would hear is booooooom. Seconds after you saw the tiny speck of my bike fly by. 1978 Honda Cx500 Maggot 1979 Honda Cx500 Custom 1980 Cx500 Deluxe Buy HTTA Items Quick Reference Info    Report

10-04-2008, 9:58 PM CXSarnia Joined on 01-11-2008 Sarnia, Ontario, Canada Posts 2,623 Re: Speedo and tacho ratio? Those signs only indicate where the moose are allowed to cross.  Keep in mind, some of them don't know how to read. 2009 DN-01 Spakin' New! 1982 CX500 Turbo & Parts bike 1981 SL185 Yamaha Exciter 198? V45 Magna 1979 CX500 Deluxe 1982 CB750K Daily rider September 1999 1982 CX500 Custom - project Originally bought April 1982 safetied and on the road 09/2008    Report

10-14-2008, 7:17 PM Scottie_116 Joined on 03-17-2008 Brisbane, Queensland Posts 31 Re: Speedo and tacho ratio? Thanks for the help guys.  Blindstitch would you agree with the 1:4 ratio i've noticed that you have said in other posts that you replaced your gauges with mini ones what ratio were they? thanks    Report

10-14-2008, 7:23 PM Blindstitch2002 Joined on 05-16-2007 Greenfield Wisconsin Posts 5,000 Re: Speedo and tacho ratio? I still have the stock gauges for now. The bike has however ate its share of speedometers. I'm on number 6. Number 5 works fine but didn't have a tripmeter. Speedo ratio is 2240=60mph. tach ratio is 1:4. I have a spare speedometer sitting in the kitchen just incase the worst happens but the one on the bike seems to be going great. 1978 Honda Cx500 Maggot 1979 Honda Cx500 Custom 1980 Cx500 Deluxe Buy HTTA Items Quick Reference Info    Report

11-09-2008, 11:56 AM Sidecar Bob Joined on 03-02-2006 Kawartha Lakes, Ontario Posts 1,899 Re: Speedo and tacho ratio? I spent a couple of hours researching this before I headed off to the wreckers to find new instruments for the winter bike. All four big Japanese bike makers use this speedo ratio: 2240 RPM = 60 MPH 2330 RPM = 100 Km/h Honda & Yamaha both use 1:4 tachometer ratio most of teh time, but some older Hondas have a different ratio (1:5 or 1:7 I think) Mr. Honda ('83 GL1000/Dnepr) summer The Famous Eccles ('84 GX650EI/Velorex700) winter WHY I HAVEN"T BEEN AROUND MUCH LATELY    Report

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