When I first bought my bike (used) it had some wear on the header from slight contact with the chain. During my first round of mods I had the header or chain adjusted to resolve the issue... now that I took my headers apart and put them back together the chain is apparently making contact with the pipe again, I do not believe it is constant, is this a serious issue or can I ride around for the rest of the season (1 month) like this?
Just so the obvious isn't overlooked...you do adjust your chain often and to the factory slack specification?
I don't really understand how it would rub unless your headers have been bent or your chain is way out of adjustment....
That said, I doubt I'd ride far with that issue, broken chains can be pretty nasty....
Post-up some pics of the issue. That might help us trouble shoot this thing.
Quote from: Ducatl on October 10, 2009, 11:34:39 PM
Just so the obvious isn't overlooked...you do adjust your chain often and to the factory slack specification?
I don't really understand how it would rub unless your headers have been bent or your chain is way out of adjustment....
That said, I doubt I'd ride far with that issue, broken chains can be pretty nasty....
Actually, I do not adjust my chain, mainly out of ignorance thus far... Perhaps I should give that a look. I will try to grab some pics of it soon.
Ummm...yeah. You might want to learn how to measure/adjust your chain. It's very easy and could potentially save your [bacon].
Quote from: rockaduc on October 12, 2009, 05:04:15 PM
Ummm...yeah. You might want to learn how to measure/adjust your chain. It's very easy and could potentially save your [bacon].
I am gonna go take a look at this thing right now in the garage... I'll bring the camera and post pics tonight. I will take a look in my owner's manual to find out the adjustment process, or feel free to post it here for me ;)
Quote from: eesnas on October 12, 2009, 06:02:46 PM
I am gonna go take a look at this thing right now in the garage... I'll bring the camera and post pics tonight. I will take a look in my owner's manual to find out the adjustment process, or feel free to post it here for me ;)
It's really easy.
You need the appropriate wrenches and a tape measure.
Do you have tools?
keep in mind...the fact that your chain is touching the header is not an indication that the chain will self destruct IMO.
Quote from: ducpainter on October 12, 2009, 06:09:02 PM
It's really easy.
You need the appropriate wrenches and a tape measure.
Do you have tools?
keep in mind...the fact that your chain is touching the header is not an indication that the chain will self destruct IMO.
Everything but the tape measure... I looked it up in the owner's manual, seems easy enough. To be honest, I agree with you that it will last through the end of the season with no issues but I guess I might as well take a look at it. More to come soon (plus this gives me a good excuse for a late night "test ride" [moto] )
(http://i112.photobucket.com/albums/n193/tonyranieri/portsmouth006.jpg)
So, looks like my chain has about a full inch of slack, maybe a tiny bit less, I believe the owner's manual says it should be 25-27mm, according to an online calculator 25mm=.9842272750 etc etc of an inch, so basically I think it's about right.
I do believe I might be due for a new chain anyways, I am right about to hit 5000 miles, I assume it can be adjusted at that time...
I took one look at the bolt that I need to loosen and realized I don't have a wrench that big, I think I should be good to just ride it out for another month, no? I don't really ride much this time of year anyways and this has happened before on my bike for a while. It was perfectly fine until I pulled the headers off [bang] ah, at least it's October [laugh]
I see many people here with clean chains, I need to learn what products are good to clean and lubricate. I am often times afraid to use chemicals on my chain to clean it as I have heard parts are plastic and can be damaged, I have used wd40 and chain lube on it but not much else, I guess that's another topic at a later date though...
A properly adjusted chain should make the bike feel a lot nicer in on/off throttle situations especially when you're just taking off from a stop. ;D
I don't think the chain is ruined by any means but riding with a super loose chain might grant you some really accelerated wear on it.
Ooooh, for some reason I thought the chain was rubbing the pipe that connects to the left-side can.
I got 10k out of my stock chain, if it's been decently taken care of I doubt it needs replacing at 5. Signs that it might need replacing are sticky or bent links that no longer move freely or if you've just run out of adjustment.
My guess is that when you reinstalled the exhaust you may have twisted the vertical pipe slightly and decreased its clearance to the chain? if you can loosen the exhaust bolts you might be able to twist it slightly so it's no longer touching.
alternatively the rear wheel is out of alignment but I would think it would be pretty noticeable if it was that far out.
Actually it has plenty of room, it's really not very close to the pipe, somehow it must just rattle enough to make contact with that spot and make it a little shiny... Eh, I guess it's just clean spot [bacon] ;D
How 'not very close' is it?
1/4"?
1/2"?
Just off memory alone I'd say 1/2 inch, of course if I move the chain with my hand I can make it just touch the pipe... I should measure that tomorrow. I am kinda surprised no other 620 owners here dropping in to mention this, I would figure the shiny spot on the header near the chain is somewhat common...
i might sound like a dumb ass but does the chain get closer to the pipe with rider weight on the bike? just a thought i dont know?
As previously stated, maybe an alignment issue. Other than that, I've got nuttin.
I have 07 695 and I have noticed the same thing on my header. I noticed this wear pretty much shortly after I bought the bike (purchased new from dealer). It was with the stock chain and I check the tension on it regularly. The wear mark is probably between 1/4 and 1/2 inch long. It doesn't seem like it is rubbing a lot, maybe once in awhile. I did replace the chain at the beginning of this past riding season and made sure that the everything was in correct tension and also aligned properly. I am not noticing it getting worse so that is why I am thinking it is a once in awhile rub, or not at all now.
This might be way off but just a thought, could be caused by aggressive hard/fast deceleration? I mean if you are slowing down fast or downshifting from a high rpm the chain will be slowing down quickly and that energy has to go somewhere and maybe the chain is get a momentary wave in it and get a little bit of slack in it. The wave could travel in the vertical plan and also could travel in the horizontal plane and cause the chain to momentarily hit the header.
Just a thought.... ;D ;D
shouldn't there be a chain guide there that would keep the chain from moving laterally?
Quote from: corey on October 15, 2009, 05:37:17 PM
shouldn't there be a chain guide there that would keep the chain from moving laterally?
My M620 chain is not rubbing and there is a block there with a center rib that rides between the chain plates. It looks like it will keep the chain from moving laterally, but it's not very high and it looks like a loose chain could ride up over it and move sideways. From the picture eesnas posted, the guide is there on his bike.
I think ducmon695 has a reasonable explanation along with maybe some frame flexing and I don't think it's all that much to worry about.