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Sportster Motorcycle Transmission, Clutch, Primary & Secondary Drive Transmission, Clutch and primary or secondary drive problems, advice, and/or how tos.

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  #1  
Old 18th October 2017
IRON-HEAD IRON-HEAD is offline
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Default starter bendix gear question

Good Morning Folks,
Long time reader, first time poster.
1979 ironhead electric start

had problem couple weeks back where something caused god-awful grinding spinning sound in middle of slower speed ride. as I pulled over got intermittent engine drag/lockup. Wouldn't roll in neutral at one point, then would a minute later. Got trailered home. Figured clutch or tranny had thrown something and it was sticking/unsticking in there.

So... I took a look in case. Can't get to clutch/tranny inspection until I get clutch compression tool so haven't been able to look in there much.

ok enough background, on to the question: when looking in the case I saw the Bendix starter gear and started checking its operation. as I understand this mechanism, the solenoid pushes out when you engage starter. this causes the fork attached to it to push on the collar and move Bendix gear into ring gear. this I observed working on my bike. however, when the solenoid shaft is unengaged, the Bendix gear stay with the ring gear. nothing mechanically moves it back. is this normal or should it be connected to the collar so when the collar moves back gear comes with it? Wondering if this could be the primary problem which would be nice to avoid clutch/trans work.

I hope I explained this ok... I'm a learning mechanic, very new, and this all new territory so my names of things are probably off.

Thanks in advance for any help!

Marty

ps: if anyone in Northern Kentucky area has a spring compression tool i'd love to rent it!
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  #2  
Old 18th October 2017
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bustert bustert is offline
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power to solenoid, magnetic flux builds and the fork is moved to engage the bendix gear to ring, by the time it hits the contact washer in the solenoid it sends power to the starter, the bendix gear should be engaged and if slightly off, the bevel cut will allow the gears to mesh on rotation. when you de-energize, the magnetic flux drops and spring action returns the system back to static state. now without the ring moving, the gears could stay meshed, under normal operation, the ring gear will throw the bendix back as there is a little worm cut on the shaft and bendix. be carefull if you apply power to the solenoid without the system fully assembled as it can throw the bendix off.


there are threads of home made compressors on the forum but i usually use a three jaw puller
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Old 19th October 2017
IRON-HEAD IRON-HEAD is offline
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So if I'm understanding correctly, there is no visible mechanical connection that bring the gear back when the fork travels back (after starting), but rather the worm cut on shaft/bendix work to move Bendix back away from ring gear after solenoid disengages, being triggered by spinning of the shaft/bendix?

With the bike on kickstand it leans to left, and when i test the action by hand is where i'm seeing the Bendix stay put after the collar recedes (gravity from leaning to left). Sounds like Bendix not receding back when collar does would be normal when testing sitting still. ?

Thanks a lot for the info!,
Marty
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Old 20th October 2017
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when i get time, will post jpeg.
there is a return by spring action. the gear can stay stuck if things are static. the bendix is a one way clutch and when the ring gear is spinning, it slips but the action of the gears throws the bendix back and spring pressure retracts to static position.
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Old 20th October 2017
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I have no spring pressure except for the spring that returns the solenoid piston to static. When solenoid piston returns to static the gear stays in engaged positon.
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Old 20th October 2017
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http://demonscy.ipower.com/manuals/s...id_66-78_1.jpg

should be something like this.

https://i.ebayimg.com/thumbs/images/...-k3/s-l225.jpg

notice the helix on the bendix and the matching on the shaft

https://img.jpcycles.com/product/3800045_A.jpg
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Old 23rd October 2017
IRON-HEAD IRON-HEAD is offline
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OK now I think i'm getting somewhere in figuring this out. It looks to me like the end of the shaft of piece 28 runs thru 29, and is held there in place by piece 30. SOooo.... if 30 broke, they would not move as one unit. I'm moving soon and after move will tear down and take a look. Thanks for the help!
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