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

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

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

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?

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

Re: SV650 Curvy - loud harsh rattles from engine
 

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

Re: SV650 Curvy - loud harsh rattles from engine
 

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