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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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  #21  
Old 30th September 2018
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Have you checked the front drive belt pulley?
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  #22  
Old 1st October 2018
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Quote:
Originally Posted by kopbilly1 View Post
i'm having the exact same problem. i've taken the primary cover off and looked over everything three times now. I can't seem to find what it may be, but its loud enough to where you would think you have a obvious problem.
...And you're riding 2003, which is exactly the same trans as mine... Anyway, I've decided to ignore and ride without worries. So far so good, and I've put about 10000 miles since I've started this thread.
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  #23  
Old 4th October 2018
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Yeah, I have been looking for a very loud rod knock for over 40,000 miles.

I'm sure it's not what it sounds like, because; I would be pulling shrapnel out of my ass by now if it was.

Everything on the bike either creates noise, or amplifies it. I think that's just part of the character of these things.

Glad to hear that you are out enjoying the bike instead of stressing over gremlins.
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  #24  
Old 16th October 2018
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My 13' Iron does it too 18k kms..call it "The Clutch release Clunk"...almost always at low speed manuvers..glad i finally found a thread that is determined to looks for solutions. Now let's do the elimination theory first.

1. It's not the oil issue making the plates stick/drag (tried the HD formula+, Motul 20w50 s-syn and mobil 1 as well)clunks when engine hot or cold.

2. Pretty sure it's not windup cos a sprocket that is snapping back the chain slack doesn't sound like a clunk..how do I know this, i have a 1972 royal enfield bullet 350 that needs it's primary cover pulled off to adjust the chain every time (note no compensator sprocket on this one, but separate primary and tranny as the big twins)and that can only be so loose before it starts skipping sprocket teeth and hitting the case surfaces inside and slapping itself on the tensioner pad (also the newer RE's have the auto chain tensioner and u can hear the chain slapping on the tensioner pad if u snap the trottle too quickly)..the sound would be more wooden than a clunk especially in a closed up primary with lube in it.

3. From the above..point is I have tested my sporty with the primary chain tight and loose but could not eliminate the clutch release clunk, this rules out the chain deflection issue.

4. If the sprocket nut is loose then there would be a side to side movement on the shaft and not a rotational movement on the axis(front to back)

5. Which brings me to my final point 'free play between the clutch basket housing and main shaft cos if there was free play at the stator sprocket and flywheel shaft then it would clunk every time we're on and off trottle even in neutral with a non moving bike.


And Yes I have ridden other sporty's too that don't do it..a friends 12' superlow and some demo bikes at the dealership including BT's. So guys let's get to the bottom of this..if someone has pulled the primary plz check for free play of the clutch basket..will do the same when i get a chance. Here to share, learn and make a better sporty in the process. Thanks guys
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  #25  
Old 16th October 2018
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I don't think it's a problem. I've always thought it was slack in the primary being released and taken up, and I still do.
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  #26  
Old 26th October 2018
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I never said it's a "this will break ur bike kinda thing" and it's certainly is not a problem per say.

And I'm all for "if it ain't broke......"
But i will also say "If this bothers you, try and improve it"

Isn't this why ppl put big bore kits to improve engine performance and go farther to chase horsepower numbers, work on suspension to make it more comfortable and trackable, improve breaking to stop better, shred weight to make it more hooligan

From all the research I have done, there are number of ppl that find this annoying..and when ur in tune with ur machine, these small harmless things are very irritating..so i request u guys to dig a little deeper so we can find a solution and not just shrug it off sayin, it's the nature of the beast. Thank you for ur time
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  #27  
Old 26th October 2018
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both my rides never did with oem clutch..
both did and does a little squeal when i run from a stop... after i swapped with a SE clutch...
i have read it's normal...
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  #28  
Old 29th October 2018
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The slight squeal is cos of the harder material SE friction plates sliding on the steel plates before they fully engage.

The thing here is a Clunk' almost like a shift clunk (which I do love) but not as pronounced when doing a slow speed manuver and modulating the clutch..imagine almost duck walking ur motorcycle at a prade or slowly navigating through heavy traffic.

It's like the clicker on a pen getting stuck sometimes before fully disengaging..and although i can replicate it like the others here..I'm not intentionally riding my bike like that (cos we all like linear clutch progression and vehicle movement don't we) but everytime it happens it's really annoying and I'm like "Oh man here we go..F U sporty".

The other thing I can think of is the 1st gear on the mainshaft and the gear it engages on the counter shaft being straight cut gears (all others being helical 06-up)..could this be the cause of this clunk produced by the gear lash from alternating inertias? In addition to the sporty not having the compensator like the BT's to smooth out the power pulses. Cos the updated transmissions with the M8's have the a scissor gear on 1st to eliminate the rattle for smoother operation.

Like from my previous post..some sporty's have the 'clutch release clunk' and some dont..Was unable to replicate this on 2nd gear but will give it another try..also can someone technically inclined throw some light on the straight cut 1st gear scenario (specific to this issue)..as always much appreciated
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  #29  
Old 29th October 2018
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It's just the slight slack in the primary chain being taken up and released. It's completely normal, and not anything to get worried or annoyed about.
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  #30  
Old 30th October 2018
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Quote:
Originally Posted by harley506d View Post
Have you checked the front drive belt pulley?
This seems the most logical, if it's the "clunk" I'm thinking of. You'd have to remove the belt to see if the sprocket moves even slightly. The primary chain "clunk" I've experienced in "Sturgis Rally" traffic., ended up adjusting the primary chain and eliminated that. Another possibility; rear motor mount.
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