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  Topic Review (Newest First)
12-20-2018 12:09 PM
JonD024
Quote:
Originally Posted by Here 2 help View Post
Simple - the gears are perpetually engaged - the starter motor spins the gears - the large gear behind the flywheel has a hub that runs inside a one way clutch - the large gear is supposed to bind (lock up) when the starter turns the gear counter clockwise - when the engine starts, it runs faster than cranking speed, so the starter gear unlocks and the one way clutch is no longer driving the flywheel. If you hit the starter while the engine is running, the starter motor runs, but nothing else happens as the engine is running faster than the starter motor turns the starter gear.

When the one way clutch is worn out or damaged, the large gear will spin without locking in both directions - both the large starter gear with hub and the one way clutch need to be replaced to fix the problem and the oil needs to be changed regularly to prevent the clutch from wearing out prematurely.

So the starter is supposed to spin clockwise? Or do I need to replace the starter to?
12-20-2018 02:03 AM
Here 2 help Simple - the gears are perpetually engaged - the starter motor spins the gears - the large gear behind the flywheel has a hub that runs inside a one way clutch - the large gear is supposed to bind (lock up) when the starter turns the gear counter clockwise - when the engine starts, it runs faster than cranking speed, so the starter gear unlocks and the one way clutch is no longer driving the flywheel. If you hit the starter while the engine is running, the starter motor runs, but nothing else happens as the engine is running faster than the starter motor turns the starter gear.

When the one way clutch is worn out or damaged, the large gear will spin without locking in both directions - both the large starter gear with hub and the one way clutch need to be replaced to fix the problem and the oil needs to be changed regularly to prevent the clutch from wearing out prematurely.
12-19-2018 04:40 PM
JonD024
Quote:
Originally Posted by Here 2 help View Post
There's basically three reasons a starter motor will spin without cranking the engine; 1) battery hooked up backwards (positive to ground), 2) bad starter drive (clutch between the starter motor and crankshaft) a common problem on abused engines that had infrequent oil changes and degraded batteries, 3) the starter motor shaft has broken or the teeth that engage the clutch gear have been stripped. There are other less common problems like the bolts holding the starter clutch to the flywheel are broken or backed out no longer holding the clutch to the flywheel, a loose flywheel and a sheared key or a broken crankshaft.

It's what keeps a mechanic busy - trying to figure out why something does not work [IMG class=inlineimg]https://www.trxforums.com/forums/images/TRXforums_2017/smilies/tango_face_glasses.png[/IMG]

So after checking the flywheel it's spins nice and smooth now but the starter still won't grab the gears to spin it over
Why are the gears not grabbing?!
12-16-2018 04:39 PM
JonD024
Quote:
Originally Posted by Here 2 help View Post
There's basically three reasons a starter motor will spin without cranking the engine; 1) battery hooked up backwards (positive to ground), 2) bad starter drive (clutch between the starter motor and crankshaft) a common problem on abused engines that had infrequent oil changes and degraded batteries, 3) the starter motor shaft has broken or the teeth that engage the clutch gear have been stripped. There are other less common problems like the bolts holding the starter clutch to the flywheel are broken or backed out no longer holding the clutch to the flywheel, a loose flywheel and a sheared key or a broken crankshaft.

It's what keeps a mechanic busy - trying to figure out why something does not work [IMG class=inlineimg]https://www.trxforums.com/forums/images/TRXforums_2017/smilies/tango_face_glasses.png[/IMG]


Wow that's got me asking myself a million questions now


After trouble shooting and taking the rear case off and looking at the starter gears they don't look stripped at all i think it's a issue with the flywheel

I replaced the crank with a brand new factory crank shaft it spun nice and smooth but when I put the front case back on and tightened all the bolts the crank wouldn't turn as smooth it felt like It was getting stuck a tiny bit

I'm thinking I didn't secured the flywheel correctly
12-16-2018 01:37 PM
Here 2 help There's basically three reasons a starter motor will spin without cranking the engine; 1) battery hooked up backwards (positive to ground), 2) bad starter drive (clutch between the starter motor and crankshaft) a common problem on abused engines that had infrequent oil changes and degraded batteries, 3) the starter motor shaft has broken or the teeth that engage the clutch gear have been stripped. There are other less common problems like the bolts holding the starter clutch to the flywheel are broken or backed out no longer holding the clutch to the flywheel, a loose flywheel and a sheared key or a broken crankshaft.

It's what keeps a mechanic busy - trying to figure out why something does not work
12-15-2018 09:40 PM
JonD024
Quote:
Originally Posted by Here 2 help View Post
I don't know what you are talking about.

The starter shaft just spins when there is power to the starter motor - the solenoid is just the switch between the battery and the starter motor - when you press the start button, it just causes the solenoid to close which in turn causes the starter motor to run.

Please explain what is happening


Sorry lol... basically when I ground out the starter and try to crank it the starter just spins... I was assuming that the shaft would pop out and spin the heat to turn the motor ?
12-14-2018 09:43 PM
Here 2 help I don't know what you are talking about.

The starter shaft just spins when there is power to the starter motor - the solenoid is just the switch between the battery and the starter motor - when you press the start button, it just causes the solenoid to close which in turn causes the starter motor to run.

Please explain what is happening
12-14-2018 08:33 PM
JonD024 Any ideas why my starter shaft won't pop out?
12-11-2018 04:22 PM
JonD024
Quote:
Originally Posted by Here 2 help View Post
The indicator lights are only indicator lights, but the neutral light switch provide a signal to the CDI unit to prevent the starter motor from spinning if in gear and the LH lever is not pulled in. You can bypass the neutral switch so the starter motor will work when in gear by simply grounding the light green wire with the red stripe. You don't have to do anything with the reverse light wires. Just cap off the black wires either individually or together - black is black, tied together and capped off is the same as capping them individually, then just cap off the other wire. You will have no indicator lights, but everything should be functional.

Jus got the battery hooked up and everywhere is getting juice but the starter relay won't engage im gonna try to switch the solenoid with a new one and see where that leaves me

This bike has been a nightmare to me hopefully I get the problem solved and get her running before Xmas! Lmao
12-11-2018 02:43 PM
Here 2 help The indicator lights are only indicator lights, but the neutral light switch provide a signal to the CDI unit to prevent the starter motor from spinning if in gear and the LH lever is not pulled in. You can bypass the neutral switch so the starter motor will work when in gear by simply grounding the light green wire with the red stripe. You don't have to do anything with the reverse light wires. Just cap off the black wires either individually or together - black is black, tied together and capped off is the same as capping them individually, then just cap off the other wire. You will have no indicator lights, but everything should be functional.
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