Well, I had my tach calibrated today and it read 40 rpm low. So when the tach was at 7500 rpm the actual eng. rpm's were 7460. I have a "01" ZR800. FYI.

* *-Auggie-

Your kidding, right? http://www.snowmobileworld-s2.com/forums/iB_html/non-cgi/emoticons/biggrin.gif

Can you still adjust the new cat tach?
What was the most you have seen a Cat tach off?
Did see some old 650 polaris tachs way off with engine rpm over 9000.
Thanks for the info Auggie. Are you drag racing??

How do you calibrate a tach?

Fine Line makes a tach calibrator ($250) you use it for a true input to adjust your tach.

To Boatmaan: No I am not. Toydoc, I don't know if the Arctic tach can be adjusted?? Probely could be done by useing resistors? Anyone know if that can be done?? My buddy is one of those elect. eng. types and has been checking my tachs for years. All of the Arctic tachs that we have checked over the years were all within 50 rpm. Some over some under. He dose a lot of work for Autometer. He's also a Polaris type and you are right about the older Polaris tachs. I did some ashpalt drag racing but did not do any drag racing on the ice. I did do a lot of NSSR 1000" streightline ice racing though. Mopar4u: He hooks the tach up to this didgital readout mach. and compares the readings. Thats why we can get to within a few rpm. When I do my clutching I just keep the tach error in mind.

* *-Auggie-

To bad the speedo's arn't as close ( percentage) wise. Tues the 8th was at my plowed speed track *http://www.snowmobileworld-s2.com/forums/iB_html/non-cgi/emoticons/biggrin.gif *http://www.snowmobileworld-s2.com/forums/iB_html/non-cgi/emoticons/biggrin.gif WITH gps unit and the sled my zl800 went just over 113, however the speedo was wrapped around on the bottom some where http://www.snowmobileworld-s2.com/forums/iB_html/non-cgi/emoticons/wow.gif *Any way, when i held it at 100 on the speedo, GPS unt said 89.7!!!!!!! * http://www.snowmobileworld-s2.com/forums/iB_html/non-cgi/emoticons/wow.gif

sorry tues the 5th, * * da,,,