[easports689]

I purchased this ATV 5 or so years ago. This has been a great ATV but the last year or so I’ve experienced some issues with the transmission in automatic mode. This ATV has two options for shifting: manual…hitting the up and down buttons to shift or the automatic option. In manual mode the transmission shifts perfectly. The issue is in the automatic mode. When you hit the throttle and you have a load (passanger , hunting stands) the bike will bog down and not take off. When you release the throttle you can hear something like a solenoid shift and reset. Sometimes you need to do these several times to get the bike to move. Once its moving the problem will not occur in the high gears only in first or a stand position.

I had an angle sensor replaced several years ago with no improvement. I‘ve changed the oil annually with only factory Honda required oil and filters also no change.

If any could shed some light on this I would be all ears.

 

[wheelsquad]

I purchased this ATV 5 or so years ago. This has been a great ATV but the last year or so I’ve experienced some issues with the transmission in automatic mode. This ATV has two options for shifting: manual…hitting the up and down buttons to shift or the automatic option. In manual mode the transmission shifts perfectly. The issue is in the automatic mode. When you hit the throttle and you have a load (passanger , hunting stands) the bike will bog down and not take off. When you release the throttle you can hear something like a solenoid shift and reset. Sometimes you need to do these several times to get the bike to move. Once its moving the problem will not occur in the high gears only in first or a stand position.

I had an angle sensor replaced several years ago with no improvement. I‘ve changed the oil annually with only factory Honda required oil and filters also no change.

If any could shed some light on this I would be all ears.

Welcome to the forum. Your centrifugal clutch is starting to go, and just slipping ever so slightly that the ECM doesn't know how to handle it in Auto mode. Your two options are run it in manual until goes out all the way, or replace the cetrifugal clutch weight assembly. I'd recommend doing the drum while you're at it.

What kind of oil are you running? Any chance anyone put regular automotive oil in it recently?

What size tires are you running?

Mine did the same thing and I couldn't believe that a slipping clutch (though minor) could cause this. But Honda didn't write logic into the ECM that prevents it from shifting up into higher ratios even if the wheel speed is still low. They made it more toque and load based. So when your clutch slips, torque is not as high as it thinks it should be, so it upshifts....which makes it slip more, less torque, more upshift, etc.

Read "Electronics and the Angle Sensor" section here: https://www.hondaatvforums.net/foru...e-learned-about-rancher-400fa.html#post209795

Also my post here (one of many similar over the years): https://www.hondaatvforums.net/foru...ke-trx-rancher-400-run-slower.html#post765697