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Starter disenging before engine startup

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Starter disenging before engine startup

PostAuthor: tech712 » Sun Jul 16, 2017 9:29 am

Hi everyone: I am in need of some help. I have a 82-750 Virago that I have purchased and trying to get running. My problem is that the starter will engage and crank the engine for about a half revolution and then it disengaged and free spins. I have replaced both spring clips,reversed the gear that engages the flywheel due to wear on one side of the teeth and locked the reduction gears ring to the case as I believe that it was spinning. Sure would appreciate any information anyone can offer. :bg: :thanks:
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Re: Starter disenging before engine startup

PostAuthor: Hellgate » Sun Jul 16, 2017 5:22 pm

Perfect battery?

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Re: Starter disenging before engine startup

PostAuthor: tech712 » Thu Jul 20, 2017 2:35 am

If you mean to use a good battery I have tried boosting the bike with a fully charged 590 cranking amp car battery with a battery charger on it. The starter still kicks out and as it spins down it will try to reengage with the flywheel ( crank gear ).
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Re: Starter disenging before engine startup

PostAuthor: tech712 » Thu Jul 20, 2017 2:35 am

If you mean to use a good battery I have tried boosting the bike with a fully charged 590 cranking amp car battery with a battery charger on it. The starter still kicks out and as it spins down it will try to reengage with the flywheel ( crank gear ).
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1985 xv750 just purchased - overhauling
1983 xj650 Maxim -sold
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Re: Starter disenging before engine startup

PostAuthor: Justheman80 » Fri Jul 21, 2017 7:16 pm

I'm no expert, new to Viragos and batteling the same issue. Another thing to think of, what condition is the starter in?

I bought an new 4 pole starter and still have the same issue. So I bought new clips, new 6gauge wire for new power and grounds. They are in the mail and will see how it goes.

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Re: Starter disenging before engine startup

PostAuthor: tech712 » Sat Jul 22, 2017 6:43 am

I removed the spark plugs and with no compression the the engine would crank over continuous as long as I held the starter button. I also noted that the number 1 plug was not firing - have to check it out. Please tell us if the new parts cure your problem .
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Re: Starter disenging before engine startup

PostAuthor: Flyingdog » Sun Jul 23, 2017 12:03 am

As you may have figured..would seem like the fact that it will turn over till the cows come home, under a no-load condition, makes one think the teeth on either the idler gear, flywheel..or both, are severely beveled. Preventing good meshing/contact of the teeth and are kicked apart under the pressures of starting. If you look at the wear marks (idler-flywheel contact), the marks show these things 'barely' engage under ideal conditions. Some people have even mentioned bout shortening the spring to enhance engagement. Don't like that one. I remember coming across somewhere, that the new (upgraded) parts (from Yamaha) leave out this spring. Don't know for sure..never looked into it.
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Re: Starter disenging before engine startup

PostAuthor: tech712 » Wed Jul 26, 2017 12:52 pm

Fixed the no spark on cyc. #1. Previous owner or someone had removed the resistance pin and spring out of the plug boot.I then removed the left side cover very carefully so I could look in to see the starter gears, they were engaged into the flywheel already. Put the cover back in place and listened very carefully as I hit the starter button, I fully believe that the starter was fully engaged every time that I tried to start the bike. There was no engagement noise and as the engine started to crank over the starter disengaged, free spinning until it slowed way down then it reengaged the flywheel,then restarting it was engaged again. The starter seems to be acting the opposite way it should .I removed the left cover again and checked the starter and found that it was turning in the proper direction. What the ***** is going on with this starter??? :ops:
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Re: Starter disenging before engine startup

PostAuthor: Flyingdog » Wed Jul 26, 2017 2:16 pm

If so inclined, you may wanna rig something like this so you can "actually see" what's up, before trying a bunch of things. Sure beats listening and guessing at something ya can't see. ----- https://www.youtube.com/watch?v=e9zW2t59z24
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Re: Starter disenging before engine startup

PostAuthor: tech712 » Thu Jul 27, 2017 10:16 am

Thanks flyingdog I am going to make the holder and give it a try.
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Re: Starter disenging before engine startup

PostAuthor: Flyingdog » Thu Jul 27, 2017 12:43 pm

NP :id: ....sure beats having to go thru dozen's of guesses, reading / then trying this or that or ...OR...the dreaded take'n off the crankcase cover...who knows how many times. That gasket will only hold up for sooo long. Good luck track'n down the culprit. (Now..where's my tube of ThreeBond?)
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Re: Starter disenging before engine startup

PostAuthor: tech712 » Sun Jul 30, 2017 12:09 pm

I made the bracket to hold the starter gears and as I thought the starter was fully engaged before hitting the starter button. I tried changing the gear so the bad side of the gear was away from the flywheel, used a full spring, a spring with one wind cut off and no spring at all. I got the same results everytime. After first attempt the gear was fully engaged in the flywheel after it stopped rotating. I would hit the starter button and the gears would spin the engine for a second or two then kick out and free spin, as it slowed to a stop the gear would reengage with the flywheel and stick there. HELP!!!!! :help:
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Re: Starter disenging before engine startup

PostAuthor: tech712 » Sun Jul 30, 2017 4:22 pm

:cl: spend the day checking everything on the bike and after a compression test I think I may have a solution to my problem. The compression on #2 is 151 -152 psi but on #1 the comp is only 120, so I think as the starter hits the high comp and then the low compression it believes the engine is starting and kicks out but still does not explain why it reengages after it slows down. Going to pull the jugs off and see what I find. :bg:
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Re: Starter disenging before engine startup

PostAuthor: Flyingdog » Mon Jul 31, 2017 2:10 am

Wow..that's a head scratch-er. Guess I've never spent that much time down there. As to me..it either worked or it didn't. Are the spring clip/brake thingies around the starter motor drive and idler gear), good and tight and seated in their respective notches? I wouldn't think the compression difference would cause this. But...then again...
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Re: Starter disenging before engine startup

PostAuthor: Justheman80 » Sat Aug 12, 2017 9:55 am

My starter clips and new battery cables are on. It works the best I can expect it to. It does not slip anymore. It will either grind on the fly wheel teeth or engage correctly. Mostly it does engage correctly and I can keep turning it over as long as needed. Keep in mind I have a new 4 brush starter and new battery as well.

How's your progress been?

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Re: Starter disenging before engine startup

PostAuthor: tech712 » Wed Sep 13, 2017 6:59 am

I have tried several different fixes and believe that I have found a cure. The starter engages properly and is very quiet. I am going to try this repair for a while and get back to you. :):
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1983 xj650 Maxim -sold
Sex: Male

Re: Starter disenging before engine startup

PostAuthor: Flyingdog » Fri Sep 15, 2017 2:38 am

tech712 wrote:I have tried several different fixes and believe that I have found a cure. The starter engages properly and is very quiet. I am going to try this repair for a while and get back to you. :):


Soooo...whatcha end up doing?
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