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cutting out in reverse

This is a discussion on cutting out in reverse within the Yamaha YFM660R Raptor (2001-2005) forums, part of the Performance /Technical category; My 04' 660 is cutting out in reverse, when I try to back up. sometimes it won't even run good enough to move back. It ...


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Old 03-28-2008, 11:59 AM   #1
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My 04' 660 is cutting out in reverse, when I try to back up. sometimes it won't even run good enough to move back. It runs great except for when it's in reverse. It has just started doing this. Any ideas what it could be? Why did it just staart doing it ?

Thanks in advance !

Greg
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Old 03-28-2008, 01:19 PM   #2
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try cleaning the green white wire behind the countershaft sprocket. sometimes chainlube dirtys it up. some have grounded it a number of ways some that lose the light or keep the light.
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Old 03-28-2008, 04:53 PM   #3
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What raska says is pertinent, but only if you have this problem when NOT in reverse.

In your case, although the 'poor running' may seem to have just started, it likely has done it all along. The Rappy has a reverse RPM limiter which is turned on when you put the bike in reverse. This limits RPM in reverse to limit your backwards speed to what Yamaha deemed a 'safe' value.

Unless your reverse switch was somehow stuck in the closed (not in reverse) position, and suddenly became unstuck, you should have always seen the limiter kick in the moment you shifted into reverse. An indicator that the switch had been stuck would be non operation of the reverse light with a return to operation now.

If you wish to eliminate the reverse limiter, simply connect the green/white-stripe wire, which leads from the reverse switch to the CDI, to a good, clean ground on the frame or engine. The CDI will now be fooled into never seeing when you put the bike in reverse. Your reverse light will not work as a result, but perhaps, a small price to pay for being able to have viable power when backing up?
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Old 03-28-2008, 06:22 PM   #4
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nicely put... +1 what quadmaniac said /\ /\ ............
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Old 03-28-2008, 07:17 PM   #5
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I realize it has a reverse limiter to keep the rpm's down, but mine won't hardly keep running enough to move. Especially in the sand. I just think theres something else going on. Maybe the reverse switch is bad? Can you clean them ?

Thanks,

Greg
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Old 03-28-2008, 09:25 PM   #6
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good call quad maniac, now i dont have to type all of that
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Old 03-28-2008, 11:50 PM   #7
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Dad, I have seen times when one can barely make the bike move and others when there is at least a little power evident... seems to sometimes depend on the phase of the moon? I suspect it's more situation dependent - sand vs. dirt, minor uphill vs. downhill. Regardless, if it causes you headaches, you may as well try disabling it.

IF you want, you can simply add a toggle switch that, when thrown, grounds the green/white wire, disabling the limiter. When the toggle switch is returned to it's original, open-contact position, the limiter and light will operate as normal... this way you have an over-ride which is only used when you really need it.

Good Luck!
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