Slow Cranking 87
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Intermediate
Joined: Mar 2012
Posts: 46
Likes: 0
From: Virginia
Slow Cranking 87
Hi, I have been chasing a slow cranking issue in my 87 FLH for YEARS and have never gotten it sorted.
Issue: Hit the starter button and you get a very slow and strained crank (2 or 3 revolutions) like it has super high compression, which it doesn't, it is a new S&S 80, but not a hot motor. Heck it even did this with the old tired Harley block in there. After a few seconds of holding the starter button down, it speeds up a tad, but sometimes, it does not crank fast enough to start and the battery will loose sufficient power to throw it over all together. Sometimes when this happens the starter won't disengage at all. Once started, I can ride all day, but it will still exhibit this behavior on every start up, even hot and with fully charged battery.
This is with:
New All ***** 1.4KW starter
battery cables #4 gauge with clean connections including grounds
AGM 300CCA Battery new and freshly charged
Newish solenoid
Newish Starter Relay
I have applied an extra ground and an extra power cable from battery to starter using jumper cables and that did not help.
Someone has to have experienced this issue before...
I know it sounds weird, but could it be the Bendix?
Issue: Hit the starter button and you get a very slow and strained crank (2 or 3 revolutions) like it has super high compression, which it doesn't, it is a new S&S 80, but not a hot motor. Heck it even did this with the old tired Harley block in there. After a few seconds of holding the starter button down, it speeds up a tad, but sometimes, it does not crank fast enough to start and the battery will loose sufficient power to throw it over all together. Sometimes when this happens the starter won't disengage at all. Once started, I can ride all day, but it will still exhibit this behavior on every start up, even hot and with fully charged battery.
This is with:
New All ***** 1.4KW starter
battery cables #4 gauge with clean connections including grounds
AGM 300CCA Battery new and freshly charged
Newish solenoid
Newish Starter Relay
I have applied an extra ground and an extra power cable from battery to starter using jumper cables and that did not help.
Someone has to have experienced this issue before...
I know it sounds weird, but could it be the Bendix?
Banned
Joined: Jan 2012
Posts: 3,098
Likes: 474
From: Location location.
Mate there is a mod to bypass the coils so it turns over a few times before it lights up , that has helped quite a few guys over the years it's in my old PC though , it's not a hard wire up either.Gooogoool knows .
You've obviously replaced or fixed anything that might be holding you back does the starter get really hot ? That will show if it's not happy the starter staying on is a clue too, how's the center tank switches all good ?
Sometimes it's something you just haven't thought off.
Try shorting it to start at the solenoid man use a big *** screwdriver see if it turns freely that way.
You've obviously replaced or fixed anything that might be holding you back does the starter get really hot ? That will show if it's not happy the starter staying on is a clue too, how's the center tank switches all good ?
Sometimes it's something you just haven't thought off.
Try shorting it to start at the solenoid man use a big *** screwdriver see if it turns freely that way.
Last edited by badcooky; Oct 28, 2017 at 12:38 AM.
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
Read through D1gger's Sticky on the dreaded click at the top of this section, to see if that sheds any light. Hopefully Dr Hess will also call by soon - he's ace at diagnosing this sort of stuff!
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,116
Likes: 7,638
From: Poolville
For the hell of it, do a compression test and post the results. It's cheap and it's quick.
Remember disconnect power to coil, remove both plugs and throttle open 100%, note first revolution compression and 8th revolution compression. Also how does it turn over with plugs out?
Let us know... Post it...
Remember disconnect power to coil, remove both plugs and throttle open 100%, note first revolution compression and 8th revolution compression. Also how does it turn over with plugs out?
Let us know... Post it...
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Seasoned HDF Member
Joined: Aug 2007
Posts: 8,200
Likes: 3,089
From: NW AR
Hey Tups, et.al:
Well, if I was gonna look at it, I would take my meter and check the voltage directly across the battery terminals when cranking. What is it? , Then alligator clip the negative lead to a good ground point near or on the starter or primary, take the positive lead and alligator that to the battery terminal on the starter, hit the starter button and see what the voltage is there. Is it the same as across the battery? If it is not real close, start going backwards from the starter and see where it drops.
I don't think the solenoid design on our bikes is all that great. The switch itself tends to get carbon buildup. Also, comments on the bearing in the primary above would be a good thing to explore if you can't find any electrical issue.
And my bike does it sometimes also. Especially when the battery is getting a bit weak. My bike is a battery killing machine. I go through about one a year. Two years is "Wow, that one lasted a long time."
Well, if I was gonna look at it, I would take my meter and check the voltage directly across the battery terminals when cranking. What is it? , Then alligator clip the negative lead to a good ground point near or on the starter or primary, take the positive lead and alligator that to the battery terminal on the starter, hit the starter button and see what the voltage is there. Is it the same as across the battery? If it is not real close, start going backwards from the starter and see where it drops.
I don't think the solenoid design on our bikes is all that great. The switch itself tends to get carbon buildup. Also, comments on the bearing in the primary above would be a good thing to explore if you can't find any electrical issue.
And my bike does it sometimes also. Especially when the battery is getting a bit weak. My bike is a battery killing machine. I go through about one a year. Two years is "Wow, that one lasted a long time."
Last edited by Dr.Hess; Oct 28, 2017 at 10:05 AM.
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Seasoned HDF Member
Joined: Nov 2009
Posts: 15,705
Likes: 22,718
From: Farmington ,MS
Even though you have that great all ***** starter...it still uses the crappy factory gear reduction which is a poor design.
Spyke makes a starter for that bike with a different gear reduction that will spin that motor faster with less battery...but they are proud of it. (pricey)
Ultima makes a copy of the Spyke starter...I have had one for 6 years and have yet to kill it.
https://www.ebay.com/itm/Ultima-Chro....c100011.m1850
Thread Starter
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Intermediate
Joined: Mar 2012
Posts: 46
Likes: 0
From: Virginia
Every hear of anyone changing the primary to a post 91 version so they can run the later starter set up?