Get a bump when on throttle...primary chain?
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6th Gear
Joined: Sep 2014
Posts: 11
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From: CT
Get a bump when on throttle...primary chain?
2001 Sportster Custom, just bought it (my first Harley and loving it).
It runs great, but I do notice I get a bit too harsh of a thump (not audible, just the feel) when rolling on the throttle. Now obviously I need to check the primary chain play, which I'll do tomorrow, but as long as I'm addressing the issue I was wondering if anyone can tell me other possible causes for this issue.
Naturally the primary chain is the most likely cause, but just in case the issue remains I thought I'd look to you guys for some guidance as to what should be looked at next.
Naturally I'll check back in with the results tomorrow. I realize I may be annoying some on the forum by putting the cart before the horse but in the interest of saving time I wanted to have other avenues of investigation in my back pocket just in case. Sorry if I'm breaking protocol as I'm brand new here, and thanks for any suggestions.
It runs great, but I do notice I get a bit too harsh of a thump (not audible, just the feel) when rolling on the throttle. Now obviously I need to check the primary chain play, which I'll do tomorrow, but as long as I'm addressing the issue I was wondering if anyone can tell me other possible causes for this issue.
Naturally the primary chain is the most likely cause, but just in case the issue remains I thought I'd look to you guys for some guidance as to what should be looked at next.
Naturally I'll check back in with the results tomorrow. I realize I may be annoying some on the forum by putting the cart before the horse but in the interest of saving time I wanted to have other avenues of investigation in my back pocket just in case. Sorry if I'm breaking protocol as I'm brand new here, and thanks for any suggestions.
Tourer
Joined: Jan 2012
Posts: 498
Likes: 25
From: Hampshire, UK
I have a little bit of a "chain slack" sound, I would describe it as the same feeling you get with the free play in a shaft drive. It's not mega but you can notice it more in higher gears. I just put it down to free play/tolerances, I've done a fair few miles on my '01 and its still ok.
Thread Starter
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6th Gear
Joined: Sep 2014
Posts: 11
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From: CT
Hey guys, thanks for the replies. The primary chain was deflecting a quarter inch beyond specs, so I took care of that and it did improve the symptom somewhat.
I haven't checked the clutch yet... I will do so. I haven't checked rear-wheel alignment yet either. Belt tension is within specs.
I kind of figured that the free play is sort of normal for a 2001 Sportster, although this one has only 5,500 miles on it. If I'm gentle with the throttle there's no symptom... you just get that backlash thump if your a little more aggressive with the throttle. Overall shifting seems fine, although neutral to 1st gives a bit more of a clank than I'm comfortable with. Of course right now I'm learning what's normal and what things I should be concerned about.
As always, I appreciate you help.
I haven't checked the clutch yet... I will do so. I haven't checked rear-wheel alignment yet either. Belt tension is within specs.
I kind of figured that the free play is sort of normal for a 2001 Sportster, although this one has only 5,500 miles on it. If I'm gentle with the throttle there's no symptom... you just get that backlash thump if your a little more aggressive with the throttle. Overall shifting seems fine, although neutral to 1st gives a bit more of a clank than I'm comfortable with. Of course right now I'm learning what's normal and what things I should be concerned about.
As always, I appreciate you help.
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