Author Topic: Primary chain and vibration?  (Read 991 times)

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Offline 1340evo

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Primary chain and vibration?
« on: July 02, 2017, 01:46:25 PM »
Here again... okay,, so I've pulled the primary cover off to get close up with the chain.. and it might be causing the vibration I'm getting...
it goes for about 1/4" movement to 3/4"... does this sound fooked?... and could it be the vibration problem?... It only happens 2500 rpm area and I'm sure you can push through?.. would a chain do this??
Only think now it getting the 1.5" nut off... I've just tried locking the brakes and a piece of wood in the primary chain... it don't want to move..

Offline charlie

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Re: Primary chain and vibration?
« Reply #1 on: July 02, 2017, 03:16:38 PM »
what makes u think its coming out of the primary :scratch:

Offline thumper 823

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Re: Primary chain and vibration?
« Reply #2 on: July 02, 2017, 03:25:15 PM »
I use a 3-foot cheater bar and a jack stand under the socket area so it does not jump off.
vibration.......
what kind of bike>? (model and year)
Vibration-
I dont know what the variance or tolerance is for the P chain.
They always have a more stretched side at one location it seems.
When in doubt..toss it out?
Inspect the sprocket for pointy teeth.
Inspect all motor mounts.
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Amateur engineering with bad math.

Offline 1340evo

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Re: Primary chain and vibration?
« Reply #3 on: July 02, 2017, 11:28:48 PM »
Not sure if I'd seen a post on P chain vibration... sort of adds up as your drive will be going on and off a bit due to the top length being a tad out as it rotates....
don't know.. do you not think vibration could come from this??
« Last Edit: July 03, 2017, 12:09:06 AM by 1340evo »

Offline Deye76

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Re: Primary chain and vibration?
« Reply #4 on: July 03, 2017, 05:02:19 AM »
How long has it been since the rubber mounts were changed?
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Offline 1340evo

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Re: Primary chain and vibration?
« Reply #5 on: July 03, 2017, 05:46:36 AM »
All new... I've actualy drilled a few holes in the front one as it was very stiff.. helped a bit... may be the back ones are still hard also?

Offline thumper 823

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Re: Primary chain and vibration?
« Reply #6 on: July 03, 2017, 06:15:59 AM »
???
Drilled holes in what?
D Troop 3/5, - C/16 ,162AHC, Mekong delta.
Amateur engineering with bad math.

Offline 1340evo

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Re: Primary chain and vibration?
« Reply #7 on: July 03, 2017, 07:13:40 AM »
the rubber.. to make it more compliant.. it was as hard as hell.. works a bit better now ;)

I put a 5mm hole at 12 / 3 / 6 and 9 oclock.. gives it somewhere to move into.. no idea what the shore hardness of the rubber should be.. but the mount was far too hard... worst case if it didn't work was to buy a new one :)

Offline thumper 823

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Re: Primary chain and vibration?
« Reply #8 on: July 03, 2017, 08:45:47 AM »
I am thinking go buy a new one.
D Troop 3/5, - C/16 ,162AHC, Mekong delta.
Amateur engineering with bad math.

Offline 1340evo

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Re: Primary chain and vibration?
« Reply #9 on: July 03, 2017, 11:18:12 AM »
working well now... when you load the engine onto it, they are meant to push down about 2mm.. this one didn't move!.. it goes down about 1.2mm now.. so after a bit of use it should be okay?....

Anyway.. can't get the big nut off.... any more thoughts on this anyone?... don't want to get the rattle gun on it if i can help it??.... would heat from a heat gun help??... I've got it jammed on the chain now.. may try a bar between the teeth, but don't want to damage them...

Offline thumper 823

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Re: Primary chain and vibration?
« Reply #10 on: July 03, 2017, 11:20:48 AM »
a 4 foot bar will do it.
Its only on there @150 lbs or so.
D Troop 3/5, - C/16 ,162AHC, Mekong delta.
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Offline 1340evo

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Re: Primary chain and vibration?
« Reply #11 on: July 03, 2017, 12:41:14 PM »
well... i had a 2.5' and was maxed out.. I'd guess 150 LBS or so... and a wack with a hammer.. didn't go  :emsad:  .. do I go to 4' and try again.. hows best to lock the thing?.. i have wood in the front sprocket right now ann its locking out good, but still have the tensioner on or it would hit the inner cover at the top?... will also have to tun the front off the socket as its got a bit countersink at the front.. so only 1/2 way on the nut... what happens if it don't move.. any way else to get them off?.. grind it off LOL  :smileo:

Offline BKACHE

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Re: Primary chain and vibration?
« Reply #12 on: July 03, 2017, 04:57:04 PM »
I have a $20 plastic 'Barbie Stair' - it looks like a stair to a doll house that fits in the top of the chain/sprocket to take off and vice versa to install. Drop the tension on the chain adjuster so the adjuster does not brake the inner primary. Grind the leading edge of the socket flat to be able to get a good grip on the short nut top.

Offline BKACHE

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Re: Primary chain and vibration?
« Reply #13 on: July 03, 2017, 05:00:50 PM »
BTW - ya a 6 foot/meter breaker bar will still take some 225lb (my big arse) weight on it to break loose sometimes. I am sure you can make the 'Barbie stair' out of hardwood to fit the sprocket size.   

Offline 1340evo

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Re: Primary chain and vibration?
« Reply #14 on: July 03, 2017, 11:41:09 PM »
Yup.. have tried that.. will try again tonight with a bigger breaker... I'm getting a slight rubbing sound and wondered if it was the stator.. also some strange electic things going on... may as well look whilst in here?..   

Offline hbkeith

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Re: Primary chain and vibration?
« Reply #15 on: July 04, 2017, 04:10:37 AM »

Offline 1340evo

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Re: Primary chain and vibration?
« Reply #16 on: July 04, 2017, 06:59:34 AM »
very nice... all I have in a bit of tube LOL... but it will happen !!   :bike:

Offline K4FXD

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Re: Primary chain and vibration?
« Reply #17 on: July 05, 2017, 09:15:58 AM »
I'm not a primary expert, but I have seen three times now a bad basket bearing cause the wobble.
 My test is to remove all clutch disks, leave the primary chain tensioned and spin the inner clutch hub. If the outer hub wobbles I replace the bearing even if it feels to be good. So far this has solved the problems. Vibration and hard shifting.
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Offline 1340evo

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Re: Primary chain and vibration?
« Reply #18 on: July 05, 2017, 09:42:01 AM »
Thanks for that.. will check.. I should have the primary chain off tonight so will also test it with just the engine running.. see if it's that... Cheers.

Offline K4FXD

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Re: Primary chain and vibration?
« Reply #19 on: July 05, 2017, 10:32:12 AM »
What I have seen is the basket will run true till it gets some tension from the primary chain. So if you loosen it then spin, it might look to be good. I thought I was wasting my money the first time I saw this, but thought I'd gamble.

Hope you find it.

I also started using a sealed bearing. I think its the clutch dust that wears these out, I can't count how many HD's I've seen with the basket wobbling.
« Last Edit: July 05, 2017, 10:40:20 AM by K4FXD »
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Offline 1340evo

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Re: Primary chain and vibration?
« Reply #20 on: July 06, 2017, 01:20:38 AM »
Great info.. thanks... will have a very close look.. as I say, running it with the chain off should give me a clue.. hopefully as smooth as silk? slack / tight spots in the chain won't help with this either....

But I still have to get the nut off!.. .6' tube coming tonight.. at what point are you liable to cause damage doing this  :smileo:

Offline thumper 823

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Re: Primary chain and vibration?
« Reply #21 on: July 06, 2017, 03:17:14 AM »
Hardware store and 4' schd  60 ought to do it.
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Offline nibroc

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Re: Primary chain and vibration?
« Reply #22 on: July 06, 2017, 04:40:19 AM »
I have a $20 plastic 'Barbie Stair' - it looks like a stair to a doll house that fits in the top of the chain/sprocket to take off and vice versa to install. Drop the tension on the chain adjuster so the adjuster does not brake the inner primary. Grind the leading edge of the socket flat to be able to get a good grip on the short nut top.

good advice---thanks

Offline FTBY55

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Re: Primary chain and vibration?
« Reply #23 on: September 25, 2017, 10:22:19 PM »
wondering what ever happened. how did you start motor with chain off?

Offline xlfan

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Re: Primary chain and vibration?
« Reply #24 on: September 26, 2017, 04:58:27 AM »
That 1.5" compensator nut might very well be drenched with a bottle of red loctite,  as red loctite is called for on that nut. Have you tried to apply some heat?

Offline 1340evo

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Re: Primary chain and vibration?
« Reply #25 on: September 26, 2017, 07:18:43 AM »
I didn't.. You can only do it with the chain on unless you fit a big driver onto the Comp nut.. not a good idea... But you can run it dry with the primary cover off... This gives you some idea :)

Offline FTBY55

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Re: Primary chain and vibration?
« Reply #26 on: September 30, 2017, 09:01:45 PM »
Yes, I did that on my fatboy. Luckily I did not damage my starter shaft.

Offline ridentheironhorse

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Re: Primary chain and vibration?
« Reply #27 on: October 10, 2017, 10:22:55 AM »
I have a $20 plastic 'Barbie Stair' - it looks like a stair to a doll house that fits in the top of the chain/sprocket to take off and vice versa to install. Drop the tension on the chain adjuster so the adjuster does not brake the inner primary. Grind the leading edge of the socket flat to be able to get a good grip on the short nut top.

good advice---thanks

I initially thought going this route 2 weeks ago replacing the stator...  made one out of a cutting board....  then I read the actual Harley Davidson Repair Service Manual, rather than the aftermarket Clymer one.....    I threw that step tool away and cut a piece of flatbar to fit between the teeth of the compensating sprocket and the sprocket on the clutch assembly.  One direction will allow you to loosen the front compensating sprocket nut (with a 3-4' pipe on your straight bar ratchet) and the other direction to undo the left-hand nut on the clutch assembly (once you are "in" past the initial nut and cover plate.....   

Offline Ironheadmike

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Re: Primary chain and vibration?
« Reply #28 on: November 14, 2017, 02:18:03 AM »
If you don't have an air impact drive . For many years I used a rope in the cylinder , 1/2 ratchet and a 3 foot cheater bar . May sure you tie a knot on the end of the rope so it don't fall in

Offline Marcus63

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Re: Primary chain and vibration?
« Reply #29 on: November 14, 2017, 03:45:19 AM »
what makes u think its coming out of the primary :scratch:

When I bought mine she also had some hefty vibration around the 2500 rpm area. I changed the horrid 2 in 2 dragpipes for a Supertrapp 2 in 1 fully tuned with the discs....and presto...the vibration issue was gone. I also gained two big handfull's of torque in the same rpm zone. Dragpipes SUCK bigtime for road riding when all you want is practical day to day performance @ all throttle settings. The sound maybe great but dragpipes are meant for WOT only.

My 2c

FXRS 1990
Stock engine
Modified airfilter, carb & exhaust

Offline Burnout

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Re: Primary chain and vibration?
« Reply #30 on: November 14, 2017, 08:25:59 AM »
what makes u think its coming out of the primary :scratch:

When I bought mine she also had some hefty vibration around the 2500 rpm area. I changed the horrid 2 in 2 dragpipes for a Supertrapp 2 in 1 fully tuned with the discs....and presto...the vibration issue was gone. I also gained two big handfull's of torque in the same rpm zone. Dragpipes SUCK bigtime for road riding when all you want is practical day to day performance @ all throttle settings. The sound maybe great but dragpipes are meant for WOT only.

My 2c

Say Hallelujah! 

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They don't call me Ironhead Rick just because I'm "hard headed"

Offline Hossamania

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Re: Primary chain and vibration?
« Reply #31 on: November 14, 2017, 09:09:18 AM »
I loved my drag pipes. The people that rode next to me did not share my view.
They worked just fine for me, because I did keep them up in the rpm's, usually running a gear short to keep them on the boil. Had to change them because they were going to get me thrown in jail.
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Offline Reddog74usa

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Re: Primary chain and vibration?
« Reply #32 on: November 14, 2017, 09:15:09 AM »
I recently swapped out the primary chain on my 77 FXE and it made a huge difference in vibration. Really knocked it down. So yes, the primary chain can cause excessive vibration if it's shot.
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