What's the difference?
Posted November 06, 2005 - 03:09 PM
Posted November 06, 2005 - 03:38 PM
I have mine disconnected, only because I couldn't be bothered pulling the tank off to connect it back up.
Posted November 06, 2005 - 04:52 PM
Posted November 06, 2005 - 05:47 PM
There are two different maps (spreadsheets) in the WR/YZ bikes. One is for the YZ and is selected if the gray wire isn't grounded. The other is for the WR and is selected if the gray wire is grounded. With the gray wire connected an alternate ignition-timing map is used. The WR map retards the timing at the mid and upper RPM so that the bike will run with the stock baffle and throttle limiter installed (see link with actual engine data analysis by TT member McGrath). If you remove the baffle and alter the throttle stop you should also remove the grey wire. Most people do not like the alternate mapping and disconnect it, especially after doing the other free mods. Initially it was advocated to cut the wire, and many riders have. There are disadvantages to cutting the wire. First if you may initially cut the wrong wire. Second, if you decide at a later time to return to the original ignition-timing map it is more difficult. Most now advocate simply disconnecting the wire from the connector and taping it off with electrical tape.
Posted November 06, 2005 - 06:06 PM
Posted November 06, 2005 - 08:23 PM
It's a yamaha!
I just wonder if long term motor life will decrease under this advanced setting.
As long as it is not pinging or lean, what is the problem?
Vortex ignition change the spark timing, which makes a big difference.
Pulling the grey wire made little to no difference.
It is recommended here in Australia to run "premium" fuel, which is 95 octane minimum. I don't think anyone here uses any lower.
Posted November 07, 2005 - 06:04 AM
Posted November 07, 2005 - 06:57 AM
Posted November 07, 2005 - 07:01 AM
The YZ mapping is a advancement of the timing, thus quality of fuel must meet the demands of the timing. If the fuel is of poor standard, this will lead to detination. If the WR map is retarted in comparison to the YZ map; it should function under low rpm to mid rpm loads with less detination. If you advance the timing you will improve performance. I just wonder if long term motor life will decrease under this advanced setting.
I concur with the variation in timing between the YZ and WR maps.
YZ ignition timing does not hurt the WR motor or effect its life. I have run 87 octane at high altitudes with no problems. I normally run 93 but out west in the mountains they dont even sell it.
Posted November 07, 2005 - 05:39 PM
Also, it seemed to be a little harder to start right after I did the mod. Any more thoughts?
Posted November 08, 2005 - 06:01 AM
Posted November 08, 2005 - 07:10 AM
keep in mind that the '04 WR's sold outside of the US all have the grey wire disconnected at the factory...
True......... Along with the throttle stop.....
Posted November 08, 2005 - 10:39 AM
Posted November 08, 2005 - 05:54 PM
I have used it in big block RAT motors in the past and it allowed major advancements in timing on that application.