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Discussion in 'Thumpers' started by sleepywombat, May 1, 2006.
Rick, thanks. PM sent.
I am NOT overtightening it. a bit loose? probably. not ignorantly loose though.
i think it's a little bit of column a, and a little bit of column b
the combo effect. minute stretch and wear adding to each other causing stretch and slop, due to design.
a little bit like if you have a length of steel strap then bend it, then straighten it, it can become marginally thinner on the bend points and thus minutely longer when straightened - the side plates in a chain. wear on steel also makes it thinner and easier to stretch under load forces. then add pin wear.
sort of like timing chains, belts and solid gear drives.
if you have over spec run out say from the crank and you can't run solid safely,
not efficient / safe for direct drive set ups, then there's belts and double rows for the lesser spec or simply for design and cost.
run out to me, is a bit like but not the cush hub rear wear and slop and then the front sprocket play on the spline,
both combined with the slow variables of wear caused on the chain by minute slow flex to stretch over time,
due to the length of the chain between sprockets and induced side loading due to drive and weight.
but don't pay any attention to me.
i can't even remember the last time i lubed my DR's chain..
it could be 3 years and about 12k.. dunno..
i'm just cranky because i found my GPS phone, and it no longer works..
looks like it may or may not have been dropped..
someone needs to un-invent the word "update".. stupid new phones.
at least i found my paper maps.
New 'custom' version of DR650 released Down Under
Got two blue tanks both with light scratches.. willing to part with for low $$$..
04 and 05 graphics....
PM me if needed...
20+k on my chain. Mine is so loose I still have the upper roller...intact. . I can take the small sprocket off without loosening the axle.
I feel the DR chain geometry isn't great and looser is better. Manual specs need multiplied by 3 or 4...
Well hell. Your 520 ek chain got about identical miles I've been getting. I am fatter than most, and probably ride harder than most. Never cleaned a chain in my life.
Looks like I'll run a vx2.
what is the difference between did vx2 and did GOLD vx2? EDIT: one is gold colored, one is natural. I asked my scooter and it didn't indicate it cared.
any negatives to a 525 on 520 rear sprocket?
Have you actually measured sideplates that have got longer over time? Seems a 'stretch' to me that they do
Others have done it, I've always run the right width sprocket for the chain. It might move about enough to interact with the chain guide, dunno.
I was disappointed with the life of the EK SRX chain. I got, I think, 3 at the time. One is on my wife's KLX300 which doesn't get the flogging, or travel the distance other bikes in the fleet do, and its OK so far, but < 2k kms only.
There was a clear out of 520 VX2 chains here a while back and I think I got 6, they were less than half price. It doesn't take long for the gold ones to look much the same as the natural ones on my DR, so much of a muchness.
I've got a 2000 tank and can send you pics if you want. All I'm looking for is shipping as well. I'm in New Mexico for my dad's 90th birthday so it would be next week.
True. Hard to believe there is enough wear in the pins alone to "elongate" the chain enough to be measurable.
Was just a thought.
I know a new timing chain will "stretch" enough to retard cam timing 1-2 degrees during the first run in. Then it seems to take a set and not move for many thousands of miles. I can't say exactly where said "stretch" occurs because I have never tried measuring the chain. Nothing can be done about it (unless you step up to a timing belt) so I just plan for it.
Nope, I have been on that combo (525 chain on 520 rear sprocket) for a while now, mostly because I couldn't get a 46 tooth in a 525 (18 inch rear wheel) - no signs of anything untoward.
What is interesting too is the spot we stopped is the middle of the tunnel route as the crow flies. The tunnel is a straight line to that point from the lake then jogs west a little then gets a few curves before the powerhouse so it isn't exactly the midpoint inside it.
Plot of our ride and line drawn on Topo North America. A great product that Garmin killed when they bought Delorme.
Actual complete tunnel route on the 1938 map
The foliage is stunning up here in Maine right now. Here is a nice shot that @Grinnin took of me on a ride yesterday.
I've seen them in the area. Paint Creek area in TN (just over the hill from the gated hole in the dam)
Go back to a 525 and get a DID ZVM-X chain, 520 is what Suzuki puts on the DR200
520 is also on a 50+ hp RMZ450.
Thanks. Already called Rick before I saw this post.
This is a great group!
So I'm back from my first week of the TAT and what an awesome trip it was! I had a few general observations that I posted here: https://advrider.com/f/threads/firs...-a-ride-report-but-some-observations.1411742/
The bike itself ran great. Getting that carb sorted before I left paid off huge. I tuned it just a bit on the lean side at sea level and it was flawless in the mountains. Granted the eastern part of the TAT doesn't see the elevation like out west but nonetheless the bike ran spot on and pulled hard all day every day (and I did not go easy on it) and still got 42-45 mpg. The only issues I had with the bike were the inside header bolt and the horn mount bolt vibrating loose.
I think the DR was the perfect choice of bike for this trip. I honestly couldn't think of a bike I would have rather had. It did it all and did it very well including a few hours of super slab at 75-80 mph up Interstate 81 to meet up with my wife w/ the trailer. All told for the week was 1262 TAT miles and about 1500 miles total. I was riding with a buddy on a BMW GS800 Adventure. He's a pretty good off road rider and very good on the road (does a bunch of track days). He and the beemer were no match for the DR and I off road and surprisingly he struggled to stay with me on the windy pavement as well. Despite having more power and better tires for the road.
It's funny. I just recently bought an '18 SV650 left over for a fun on road bike but all week long was thinking that I should probably just do a DR650 SM. The bike did that well. I friggin' love my DR!!!!
also what the ktm 690 runs, so it isn't like the 520 is undersized. I think i am fatter than most and harder on the chain because of that.
There is a big difference in chain materials and I can’t see why a 520 would be weaker than a 525 or a 530. Making the pins longer may offer some additional bearing on the pins. A strong 520 will be plenty strong. The amount of engagement to the wider sprocket has got to improve the life of the sprocket. There may be 8 or so teeth touching on the countershaft sprocket and unless I was really fighting for every ounce, I’m in for the wider 525 every time.