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Thread: Timing belts....why 12K km? Reply to Thread
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  Topic Review (Newest First)
07-03-2006 03:57 PM
mnztr
Re: Timing belts....why 12K km?

Quote:
Originally Posted by Flyer
I guess my situation is more a question of shelf life. I mean when buying "new" belts how do we know when they were manufactured? "new" belts might in fact be already more then 2 yrs. old.

That is a very good point, the belts you buy could actually be OLDER then the ones you replace, and they are in a relatively constrained box. Since my belts are open, I will follow the Ducati service interval or if I see any deterioration or loss of tension, I will replace them immediately. What is the Ducati recommendation on the new 2Vs?

07-03-2006 03:15 PM
Flyer
Re: Timing belts....why 12K km?

I guess my situation is more a question of shelf life. I mean when buying "new" belts how do we know when they were manufactured? "new" belts might in fact be already more then 2 yrs. old.

07-03-2006 12:51 PM
22080
Re: Timing belts....why 12K km?

For whatever reason, (probably all of the above) old belts on a Ducati are a time bomb. Before the red letter belts it was not uncommon for a bike to show up for a 12K service and the belts would be almost history. I do believe it is possible for the red letter belts to last 18 or even 24 K on a bike that is ridden daily, but why try? The cost of an engine is one thing but imagine a belt failure while leaned over at speed in a turn. Changing the belts is preventative maintenance. That means before they break, not after.



07-03-2006 12:45 PM
Flyer
Re: Timing belts....why 12K km?

Well when I bought a fully rebuilt 944 I had this question about age. Since the engine was built at just 2 years ago but has not been started yet. I called the shop that did the engine (extremly respected BTW) and asked them if I should change the belts since it had been sitting so long. There short answer.... Nope belts will be fine change them at the milage point.

Now this thread has me wondering again.
07-03-2006 12:37 PM
BryanS
Re: Timing belts....why 12K km?

my dealer only wanted $30 per belt so, while they had the belts off adjusting my valves at the 6000 mile check I had them swapped, being that they were over 2 years old. I was already paying the labor anyway so the extra $60 was cheap piece of mind
07-03-2006 12:26 PM
Jethro
Re: Timing belts....why 12K km?

Quote:
Originally Posted by mnztr

Not too sure about all that, the drive pully on my Miata is pretty small, (driven pullieys are larger).
I've done belts on 3 cars and they all had larger dia crank pulleys but* it looks like your Mazda has got 24 teeth on crank pulley with my M1000 having 20 teeth so agree not much difference. I think the 900 engine has 18 teeth.
Regarding speed, the Monster pulleys all run at half engine speed as opposed to the car crank pulley running at engine speed so that should be better for our belts.
I'm wondering if running the belts without covers can cause* abrasive damage from road grit?
Perhaps the improved Gates 'red letter' belts can safely run more miles but Ducati would sell less belts?

Interesting stuff there hiero but it looks like those pics are because the belt was fitted wrong. Aren't we talking about belt life when fitted right?
Having said that, I've just replaced my belts at 6500 miles because the bike was a left-over and had been standing still for a long time. I'm not risking it - just enjoying the discussion
07-03-2006 11:48 AM
hiero
Re: Timing belts....why 12K km?

it seems you're pretty hard up on running the belts past the recommendations, so no biggie as it is your bike* *

not to beat a dead horse and all that, but really, if you're trying to save money somewhere, belts would probably not be the best place to do it.

just a few more threads to read up on (only if you're interested):

these have some interesting pictures:
https://www.ducatimonster.org/smf/ind...c,43988.0.html
https://www.ducatimonster.org/smf/ind...c,43989.0.html
most notably pics like this:


https://www.ducatimonster.org/smf/ind...c,36115.0.html

and to a lesser extent:
https://www.ducatimonster.org/smf/ind...c,21302.0.html


and trust me, I'm seriously not trying to be an ass about this at all as I agree with you that the recommendations are probably pretty conservative and i understand your points. Just want to make sure all the information is out there
07-03-2006 11:24 AM
mnztr
Re: Timing belts....why 12K km?

Quote:
Originally Posted by Jethro
Pulley diameter may be a factor as well?

Not too sure about all that, the drive pully on my Miata is pretty small, (driven pullieys are larger). Also as far as RPM, the Miata cruises at about 3.5-4K rpm with is only slightly lower then my M900. and has a redline of 7K rpm. Like I said, I have not heard any case of belts "timing out" and breaking. I've had my belts on for 2 years, and about 8K miles. I run them open. I have not even had to retension them yet. I would not retension the belts more then once. To be honest when I did my fist ever belt change on this bike, the old belts were so loose, I was stunned!!! I had been riding the *rap out of it with really loose belts and it STILL did not skip!!! So that has conviced me that perfect tension is not so critical although making them too tight will shorten their life, but as long as they stay pretty snug after initial install they are good to go.
07-03-2006 05:54 AM
Mowster
Re: Timing belts....why 12K km?

Quote:
Originally Posted by howie
Two years or 12K miles, whichever comes first.* In other words, if you don't know when they were last changed, change them.
Cheers m`dear...as said: cheap insurance
07-03-2006 05:50 AM
22080
Re: Timing belts....why 12K km?

Two years or 12K miles, whichever comes first. In other words, if you don't know when they were last changed, change them.



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