Chain jumps - is this ok?

JustRon · 01-11-2013, 07:17 AM

This is an '08 Husaberg and the rear sprocket and chain are pretty new. I put a new front sprocket on (15t), but it wouldn't fit with the chain slider, so I modified the slider. There's not much room around the 15t, so I was a little paranoid. I've never tried this with my 'berg, but I ran it in first gear on the stand, just to make sure everything looked ok. But, the chain is jumping quite a bit. So, I put the old sprocket back on (14t- still in excellent condition, shows no wear). I get the same jumping.
When I give it a little throttle, it seems to jump a bit less, but still jumps a lot.

Here's a video:
https://picasaweb.google.com/1179750...02953261146322

Not sure if that video will work, because my work blocks it for me.
I posted this on Husaberg.org, and one guy said it's normal when the suspension is uncompressed. Tonight, I'll look for a kink in the chain, but I'd be very surprised to find one.
Any ideas?

sieg · 01-11-2013, 07:46 AM

Looks fine, just engine surges. Load the chain/engine (drag the rear brake) and it will smooth out.
BTW the video works, now get back to work.

groundrules · 01-11-2013, 09:33 AM

no chance you've got a sticky/frozen link on the chain, right?

Switchblade315 · 01-11-2013, 09:45 AM

even seen what a chain does when you go over bumps. that looks like the rear tire is getting faster then the chain and pushing slack in it or a split second. and you might possibly have a stiff link but i say it looks normal. as suggested put just a little pressure on the brake and I bet it stops.

JustRon · 01-11-2013, 10:52 AM

Quote:

Originally Posted by groundrules

no chance you've got a sticky/frozen link on the chain, right?

^ I'll check that tonight. I think I would have noticed already, but I haven't specifically looked for it yet.
And, I'll try applying the brake (I have this horrible feeling I'll put weight on the rear and the spinning wheel will catch the ground, heh.)

I guess I just don't know how this should look. I assumed the wheel would spin and the chain would look pretty smooth.

bomber60015 · 01-11-2013, 11:29 AM

the video you posted looks very normal . . . . if your worried about weighting the scoot and dropping the tire to the ground (which, I agree, might be exciting), create drag on teh wheel (2X4 or some such) . . . . . . same affect.

sieg · 01-11-2013, 12:28 PM

Quote:

Originally Posted by broadwayron

^ I'll try applying the brake (I have this horrible feeling I'll put weight on the rear and the spinning wheel will catch the ground, heh.)

Just push the pedal with your hand, or a long screw driver under the foot peg and over the pedal that will not weight the rear of the bike at all.

anotherguy · 01-12-2013, 07:48 AM

Big single torque pulses + typical drivetrain slack = jumpy chain. You oughta see my Tuono's chain on the dyno at 2500 RPM.

JustRon · 01-12-2013, 06:54 PM

Took it for a test ride today with the bigger front sprocket, and all seems well.
Thanks for easing my mind!

(Third gear power wheelies take slightly more throttle with the bigger sprocket- I love this bike.)

01-11-2013, 07:17 AM	#1
JustRon ^OP ex-broadwayron Joined: May 2011 Location: Brooklyn Oddometer: 537	Chain jumps - is this ok? This is an '08 Husaberg and the rear sprocket and chain are pretty new. I put a new front sprocket on (15t), but it wouldn't fit with the chain slider, so I modified the slider. There's not much room around the 15t, so I was a little paranoid. I've never tried this with my 'berg, but I ran it in first gear on the stand, just to make sure everything looked ok. But, the chain is jumping quite a bit. So, I put the old sprocket back on (14t- still in excellent condition, shows no wear). I get the same jumping. When I give it a little throttle, it seems to jump a bit less, but still jumps a lot. Here's a video: https://picasaweb.google.com/1179750...02953261146322 Not sure if that video will work, because my work blocks it for me. I posted this on Husaberg.org, and one guy said it's normal when the suspension is uncompressed. Tonight, I'll look for a kink in the chain, but I'd be very surprised to find one. Any ideas? __________________ 2010 520RR 1982 KE100 2010 Scrambler FOR SALE

01-11-2013, 07:46 AM	#2
sieg Beastly Adventurer Joined: Jul 2008 Location: Southern Illinois USA Oddometer: 1,390	Looks fine, just engine surges. Load the chain/engine (drag the rear brake) and it will smooth out. BTW the video works, now get back to work. __________________ I'm not saying there should be capital punishment for stupidity, but let's take the safety labels off of everything and let the problem solve itself. Current bikes: '12 WR250R, '10 F800GS, '08 Versys, '07 WR250F, '85 RZ350, Wife's bikes: '10 F650GS, '09 XT250,'03 WR250F

01-11-2013, 09:45 AM	#4
Switchblade315 Beastly Adventurer Joined: Oct 2009 Location: Ethel, Ms Oddometer: 3,242	even seen what a chain does when you go over bumps. that looks like the rear tire is getting faster then the chain and pushing slack in it or a split second. and you might possibly have a stiff link but i say it looks normal. as suggested put just a little pressure on the brake and I bet it stops. __________________ When i die bury me upside down so the whole world can kiss my ass.

01-11-2013, 11:29 AM	#6
bomber60015 Anatomically Correct Joined: Sep 2008 Location: Chicago-ish Oddometer: 2,499	the video you posted looks very normal . . . . if your worried about weighting the scoot and dropping the tire to the ground (which, I agree, might be exciting), create drag on teh wheel (2X4 or some such) . . . . . . same affect. __________________ Searching for the immaculate contraption

01-12-2013, 07:48 AM	#8
anotherguy Beastly Adventurer Joined: Jun 2009 Location: in the foothills now.... Oddometer: 4,315	Big single torque pulses + typical drivetrain slack = jumpy chain. You oughta see my Tuono's chain on the dyno at 2500 RPM. __________________ When injustice becomes law,resistance becomes duty. Thomas Jefferson

01-11-2013, 09:33 AM	#3
groundrules Studly Adventurer Joined: Aug 2007 Location: Oh hiya Oddometer: 876	no chance you've got a sticky/frozen link on the chain, right?

01-12-2013, 06:54 PM	#9
JustRon ^OP ex-broadwayron Joined: May 2011 Location: Brooklyn Oddometer: 537	Took it for a test ride today with the bigger front sprocket, and all seems well. Thanks for easing my mind! (Third gear power wheelies take slightly more throttle with the bigger sprocket- I love this bike.) __________________ 2010 520RR 1982 KE100 2010 Scrambler FOR SALE

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