SV650 Curvy - loud harsh rattles from engine - SV650.org

26-05-15, 05:26 PM

Hello all,

Looking for some diagnostic help from the forum. I was riding to work this morning on my 99 SV650 & just as I rolled off from about 60-70 mph noticed extra engine noise - when I stopped the noise was a very loud harsh rattling - listen to the youtube below - anyone ideas what it could be?

Engine still seems to have power, both cylinders firing, but noise sounds bad.

I slowly continued the short distance to work & then got a breakdown truck to get it home to avoid making it worse.

https://youtu.be/xyUERyPGJCk

George

27-05-15, 06:09 AM

Closer listening & loud rattle is from front cylinder. I think 1st thing to check is Cam Chain Tensionser. Bike has 40K & CCT is original. Could CCT cause such a loud rattle?

George

Geodude · 27-05-15, 06:40 AM

Whats your oil level like? My front cct rattled when my oil was too low. HTH and free bump to get attention of the clever bods

Craig380 · 28-05-15, 02:12 PM

Hi, hard to tell exactly from the YT clip, but it couldn't be a blown exhaust gasket on the front cylinder, could it?

07-07-15, 08:56 PM

Hello all,
Turned out to be front cam chain tensioner. When I removed it, I could see it was stuck in retracted position - i.e. not putting tension on the chain guide.

Wound it out\in & it started working but a bit sticky then it stopped working. Took it apart & could see that spring had shorn off just a small bit where it sits across the slot at top - so when I was turning the slot, the spring was not winding up.

Anway, ordered K3 replacement. While waiting saw a post that suggested you could just bend a fresh bit of the spring across the slot which worked ok. As K3's were ordered, decided to wait & fit K3 fronyt which worked fine and engine running sound & quiet so luckily no damage done.

But I have a spare back up if I ever need it - original lasted over 40k miles so not to shabby I guess.

Any thoughts on should I change the back cyl to K3 tensioner? Hear it's a lot harder than front to get at?

George

maviczap · 08-07-15, 05:17 AM

It cant hurt to change the rear cct, removing to rear footpegs can help with access..

PhilSV · 08-07-15, 05:47 AM

Rear one was easier to do on mine than the front, curvy as well.

26-05-15, 05:26 PM	#1
SVGeorge Guest Posts: n/a	SV650 Curvy - loud harsh rattles from engine Hello all, Looking for some diagnostic help from the forum. I was riding to work this morning on my 99 SV650 & just as I rolled off from about 60-70 mph noticed extra engine noise - when I stopped the noise was a very loud harsh rattling - listen to the youtube below - anyone ideas what it could be? Engine still seems to have power, both cylinders firing, but noise sounds bad. I slowly continued the short distance to work & then got a breakdown truck to get it home to avoid making it worse. https://youtu.be/xyUERyPGJCk George

27-05-15, 06:09 AM	#2
SVGeorge Guest Posts: n/a	Re: SV650 Curvy - loud harsh rattles from engine Closer listening & loud rattle is from front cylinder. I think 1st thing to check is Cam Chain Tensionser. Bike has 40K & CCT is original. Could CCT cause such a loud rattle? George

27-05-15, 06:40 AM	#3
Geodude Member Mega Poster Join Date: Jun 2009 Location: Durham Posts: 2,676	Re: SV650 Curvy - loud harsh rattles from engine Whats your oil level like? My front cct rattled when my oil was too low. HTH and free bump to get attention of the clever bods __________________ Black naked 1999 sv650 which im trying to keep happy Custom paintwork *Saragon Customs* Spray painting *Electrical fault finding guide* and *Regulator rectifier test* Only a biker knows why a dog sticks his head out of a car window.

28-05-15, 02:12 PM	#4
Craig380 Member Mega Poster Join Date: May 2015 Posts: 1,302	Re: SV650 Curvy - loud harsh rattles from engine Hi, hard to tell exactly from the YT clip, but it couldn't be a blown exhaust gasket on the front cylinder, could it?

07-07-15, 08:56 PM	#5
SVGeorge Guest Posts: n/a	Re: SV650 Curvy - loud harsh rattles from engine Hello all, Turned out to be front cam chain tensioner. When I removed it, I could see it was stuck in retracted position - i.e. not putting tension on the chain guide. Wound it out\in & it started working but a bit sticky then it stopped working. Took it apart & could see that spring had shorn off just a small bit where it sits across the slot at top - so when I was turning the slot, the spring was not winding up. Anway, ordered K3 replacement. While waiting saw a post that suggested you could just bend a fresh bit of the spring across the slot which worked ok. As K3's were ordered, decided to wait & fit K3 fronyt which worked fine and engine running sound & quiet so luckily no damage done. But I have a spare back up if I ever need it - original lasted over 40k miles so not to shabby I guess. Any thoughts on should I change the back cyl to K3 tensioner? Hear it's a lot harder than front to get at? George

08-07-15, 05:17 AM	#6
maviczap Member Mega Poster Join Date: Mar 2007 Posts: 9,097	Re: SV650 Curvy - loud harsh rattles from engine It cant hurt to change the rear cct, removing to rear footpegs can help with access.. __________________ We're riding out tonight to case the promised land Make everyday count RIP Reeder - Jolly Green Giant and comedy genius

08-07-15, 05:47 AM	#7
PhilSV Member Join Date: Apr 2012 Location: Lincolnshire Posts: 366	Re: SV650 Curvy - loud harsh rattles from engine Rear one was easier to do on mine than the front, curvy as well.

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