Ducati Monster Forum

Moto Board => Tech => Topic started by: Jason1 on June 26, 2012, 05:12:36 AM

Title: Need new chain and sprockets asap and need advice
Post by: Jason1 on June 26, 2012, 05:12:36 AM
I am in need of a new chain as mine is binding in spots.  I have never had to replace a chain so I don't know what I am looking for. Right now I have a 15 tooth sprocket in the front and a 38 tooth in the back which was on there when I bought it. What is the stock sizes? Also what is the better chain o-ring or x-ring?  And last what pitch do I look for, Right now my links all say 520. Thanks Jason
Title: Re: Need new chain and sprockets asap and need advice
Post by: Jason1 on June 26, 2012, 05:14:53 AM
Sorry 2001 monster 900
Title: Re: Need new chain and sprockets asap and need advice
Post by: Slide Panda on June 26, 2012, 05:32:49 AM
Stock gearing appears to be 15/39. I suggest you consider 15/42, what I run on my 900. The larger rear will cost you a bit off the tip-top end which doesn't really matter unless you're going to a bit open track with it. A 900 has plenty of top to break basically any speeding laws.

520 corresponds to the 'heft' of the chain and 520 is just fine on a 900. X vs O, given the same maintenance and use an X ring chain should last longer before stiff spots and bound links occur. The X profile of the ring creates two seals per side vs the 1 per side of the O ring. But as long as you get a quality chain, a lot of the life depends on you. Rinding style and maintenance play big factors - maintenance more of the two. Neglect the chain and it'll crap out fast. The last chain on my 900 had around 15k on it when I replaced it and it probably could have gone another few Ks, but I didn't want to have to deal with it in season so I just sucked it up and did it over the winter.
Title: Re: Need new chain and sprockets asap and need advice
Post by: Jason1 on June 26, 2012, 05:35:55 AM
Do you know how many links that may be? I have 98 on it right now. 
Title: Re: Need new chain and sprockets asap and need advice
Post by: Slide Panda on June 26, 2012, 05:38:59 AM
Nope.. you'll have to buy a chain and have it fit.

You'd be picking up a couple links for sure. When I replaced my chain I didn't change the gearing so I just laid them out side by side and matched up - checking every few links to ensure that things where lined up incase the old one had significantly stretched portions.

Title: Re: Need new chain and sprockets asap and need advice
Post by: Jason1 on June 26, 2012, 05:43:46 AM
I realize I would need to fit it.  I was wondering if I should get 102 links or 104.  I guess I would rather throw out 2 links and be safe then come up 1 short.
Title: Re: Need new chain and sprockets asap and need advice
Post by: Slide Panda on June 26, 2012, 05:48:16 AM
Yeah, get a few extra links. As noted, it would suck to come up short. And remember to get a master link, some chains don't come with so double check.
Title: Re: Need new chain and sprockets asap and need advice
Post by: ducatiz on June 26, 2012, 06:00:56 AM
Chain link/ratio calculator:  http://www.rbracing-rsr.com/chainlength.html (http://www.rbracing-rsr.com/chainlength.html)

Monster has approximately a 22" center to center distance

also calculates ratio if you are a gearing nerd and like that. 

(ps browse that site for some great laffs, they are full of piss and vinegar)
Title: Re: Need new chain and sprockets asap and need advice
Post by: Slide Panda on June 26, 2012, 06:19:14 AM
Another gearing site

http://www.gearingcommander.com/ (http://www.gearingcommander.com/)

Just remember that listed top speeds are done by math only and dont account for air drag