Aftermarket tach ratio

[gsrick]

Has anyone used an aftermarket tack on the 16v engine GS? A friend wants to know what ratio he should choose, 1:4, 1:5 or 1:7? He has a 16v 750 engine in a 77 750 frame. That's all the info I have, but can ask for more info if needed. Thanks in advance.

[posplayr]

aftermarket mechanical tach? Aren't most electronics in which case they read direct RPM off the coils.

I guess they exist. This one claims to work for my GS1100ED so I'm guessing it might work for his. Use the model selector to check for compatability

http://www.ebay.com/itm/Mini-Universal-Motorcycle-Mechanical-12K-RPM-Tach-Tachometer-Gauge-1-4-/151666316926

[gsrick]

I'm not sure where he's getting one from, but I did mention Dime City Cycles and their mechanical tach come in 1:2, 1:4, 1:5 and 1:7 ratios.

http://www.dimecitycycles.com/motorcycle-parts.html?cat=1861

Looks like the 1:7 ratio is designed for early small cc bikes, like early 70s CB450 and 550s and similar.
1:4 may be the ticket, ad says for 750cc and larger and the one I'm looking at is made for the CB750.
1:5 tach ad says it designed for Kawasaki and Yamahas.
1:2 doesn't specify any cc or make. Must be for Hardleys.

[GregT]

1 : 4 is the common one for Suzukis. 1 : 2 is sometimes found on older British stuff.