barden Posted November 17, 2005 Share Posted November 17, 2005 Just got out the workshop i am put my ace engine back into my yzf750 frame "again" Plz help when the key in turned on the rev counter the needle goes up the scale and then back down this happens when the engine is running as well. "the fuel tank is not on at the moment i am running the bike on a mower tank" could this be the problem. Link to comment Share on other sites More sharing options...
sheeny7 Posted November 17, 2005 Share Posted November 17, 2005 well mate put the tank on or wirer it up.. i'd say the clocks are electrical so i'd be more likely be that cause.. couple of mates work for yamaha so if your still stuck in next few days i'll see they can help.. Link to comment Share on other sites More sharing options...
Moderator Beezkneez Posted November 18, 2005 Moderator Share Posted November 18, 2005 afaik the thunderace has set fault issues which are shown by the rev counter, as you say go up and down....each different for various faults. Link to comment Share on other sites More sharing options...
barden Posted November 23, 2005 Author Share Posted November 23, 2005 cheers guys sorted 6 rpm is a fuel pump fault 9 rpm is exup servo fault Link to comment Share on other sites More sharing options...
raymani Posted November 23, 2005 Share Posted November 23, 2005 Last spring when I just had bought my YZF, I had a similar fault after first time I washed it. When I turned around the key the nedle jumped up and stopped on 15000 (the engine was not started). When I then started the engine it stabilized on the right RPM, but it was jumping up and down some times. I opened it, but could not see any water, but spendt a few minutes with an hairdryer, before I put it together again. After that this has never occured again, so I guess that a little bit of humidity can give symptoms like that. Link to comment Share on other sites More sharing options...
andye1 Posted March 13, 2006 Share Posted March 13, 2006 from what i remember thin happens when uve got a sticking exup valve. Link to comment Share on other sites More sharing options...
mavie3 Posted August 12, 2009 Share Posted August 12, 2009 well mate put the tank on or wirer it up.. i'd say the clocks are electrical so i'd be more likely be that cause.. couple of mates work for yamaha so if your still stuck in next few days i'll see they can help.. i am having the same problem it goes up to eight yhen back down to o then back up to 3 Link to comment Share on other sites More sharing options...
rf9rider Posted August 15, 2009 Share Posted August 15, 2009 i am having the same problem it goes up to eight yhen back down to o then back up to 3 8000rpm indicates a problem with the fuel level indicator circuit Check the wiring connector that goes to the tank. Link to comment Share on other sites More sharing options...
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