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Message started by HighME32 on 11/21/14 at 09:53:10

Title: Re: Cam chain theory
Post by HighME32 on 11/21/14 at 09:53:10

Hi All, I've read most of the info about the cam chain tensioner and chain. I am about to get a verslavy soon. I have read that the newer model s40s have crappy chinese chains. Should i change the chain when i get the verslavy. I just dont want to have to keep tearing into this thing instead of enjoying riding it. I have an 07 s40 with 8500 miles.

Title: Re: Cam chain theory
Post by verslagen1 on 11/21/14 at 11:18:16

You have an '07 with 8500 miles, 1100 miles a year.
If you rode it once a month for a 100 miles, your chain will be fine and will likely get 30,000 miles out of it.
If you rode it every day for 3 miles, your chain is likely half dead and needs a verslavy.

Yes it supposed that later chains come from china. But low life chains are ridden daily a short mileage versus once in a while for really long mileage.

And what are you going to replace it with? The same chain.
Better to get the full life outta the chain.

Title: Re: Cam chain theory
Post by Ed L. on 11/24/14 at 06:56:09

Just plan on replacing the chain around every 20,000 miles. The adjuster was out at almost 17mm after only 10,000 mikes on my '02 which was close to the safe limit. Installed a Slavy (no pin) and expect to be back in the side cover at 20k miles.
Replacing the chain is a lot more work with pulling the clutch pack, why make the any harder than needed. And as Verslagen said what are you going to replace it with, just the same cheap chain that's in there.

Title: Re: Cam chain theory
Post by 49mack on 11/25/14 at 17:01:00

I've read all I could find on this site about cam chains and adjusters. I appreciate all the experience and brainpower contributed. But I cannot find a description of symptoms of when the chain becomes worn and slack or the adjuster has reached its' limits and no longer tensions the chain. My '96 (20,000 miles) runs great and strong until 69-70 mph in 5th gear. Then it cuts out like fuel starvation until I back off the throttle. Could this be caused by a worn chain or adjuster? Perhaps not opening the valves all the way at high RPM? I am confident my carburetion is OK. I'm well schooled on Mikunis from my crazed you as a long time motoctosser.

Title: Re: Cam chain theory
Post by Dave on 11/25/14 at 18:02:27

2C363B3A3C3E2D686B5F0 wrote:

Nope....cam chain won't cause that symptom.

Do you still have the stock vacuum petcock? :-?

Title: Re: Cam chain theory
Post by justin_o_guy2 on 11/26/14 at 10:23:23

NO, cam chain won't cause that, But, at 20,000 miles it IS time to get in there and look at it.
You can try to Prove its starving by running up till it acts up and shut off the engine But I suspect that as it winds down it would give the petcock time to load the bowl, so maybe you'd need to slap a clamp on the fuel line, then hit the kill,,, and I don't know if all that can be done safely at speed.
IF you do that AND you live, then drain the bowl into a cup or a piece of clear tubing on the nipple held up by the bowl will show you the gas level In the bowl. Maybe the float height is not right, if you have a filter,insufficient flow,,, lots of possibilities

Title: Re: Cam chain theory
Post by 49mack on 12/18/14 at 05:58:03

I have changed the stock petcock to an OEM raptor, added a fuel filter, removed the California emissions, box, added a cone air filer and rejetted the carb for best performance and correct tan plug color. My local (highly experienced tech) thinks it's carburetion. The float height is set correctly. It just seems like it is encountering fuel starvation at 69-70 mph. And yes, it did this before I added the fuel filter. I have increased the main jet in in increments of 145 to 150, 150 to 155, then 155 to 160. Ech upsize added more top end mph until I installed the 160. With the 160, it ran worse so I went back to the 155. Also pilot jet size was changed 42.5 Yes, I've been completely through the carburetor. Best I can get is 69-70 mph which isn't enough to keep from getting run over on brief interstate jaunts. It runs strong until 69 mph.

Title: Re: Cam chain theory
Post by Dave on 12/18/14 at 06:05:26

Tell us about the muffler. Is it stock, or something else?

The baffles in the muffler can come loose and block flow. Our own Verslagen had this experience a few months ago....