the DR650 thread

Discussion in 'Thumpers' started by sleepywombat, May 1, 2006.

  1. William Wolfen

    William Wolfen DR Guy

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    They haven't sold them in Europe for the better part of 20 years. They'll all be early models and you'll likely have to take what you can get since they aren't as common.
  2. sandwash

    sandwash Long timer

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    Out with the old and in with the new,it's a thing of beauty.Totally way different ride,It just soaks up the bumps and makes for a super smooth ride.With all the adjustments on it make easy to get it where you want it.,very stable and and keeps the rear end planted.With the info I gave Todd at Cogent for the build it was spot on,very little adjustment on my part to make it a super comfortable ride(with Rick's advice).Big heads up to Rick,Todd and the rest of the folks at Cogent for putting something like this out there for folks like me/us that need/want something way better than stock.It is a great investment along with the DDC's for a super plush ride,couldn't be happier with the results.Did I mention it just soaks up the bumps?
    [​IMG]
  3. daveagl

    daveagl n00b

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    I'm looking at a few that are from 1993 and around, they look lovely though!
  4. William Wolfen

    William Wolfen DR Guy

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    Ok. So that's one thing that needs explaining. The DR that this thread is about its the '96 and later model. The earlier ones are a totally different design. There also happens to be another thread about them. They're not bad bikes, but they've been out of production a long time now.
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  5. stoltzfii

    stoltzfii Been here awhile

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    I have a dr650 with a bad knock.

    Pulled my head, rings look ok, cylinder walls are ok, the right side of the piston at the top is really black, maybe from blow-by.
    But the valves look terrible. The intake valves are black and the exhaust valves are crazy white. Would this be from the engine running way too lean or from the blow-by? The valves were cleaned and lapped 1500 miles ago, so this all is very recent. I am burning through a lot of oil, 1 liter every 500 miles, but I can't get new rings in Chile, and I'm 250 miles from Ushuaia.

    Doesn't really explain the knocking. Unless it's a detonation issue. Any suggestions?



    [​IMG][​IMG][​IMG]
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  6. Ever Onward

    Ever Onward Older,Wiser, Smarter

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    You may not like my answer, but if it were me, I would be ridin in a truck that last 250 miles.
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  7. stoltzfii

    stoltzfii Been here awhile

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    That's what I'm planning on. I more just pulled it to see what the issue is and if I could fix it relatively easy I would, otherwise sell it for parts for cheap here in Punta Arenas
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  8. Redfish Hunter

    Redfish Hunter Been here awhile Supporter

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    Why does it look like only the center spark plug is firing? Is that just how it looks in the picture?
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  9. Ever Onward

    Ever Onward Older,Wiser, Smarter

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    Good idea.

    With the look of your piston and the amount of oil its using, I would seriously think about shooting that donkey and putting it out of its misery.

    Sure, you can fix it. But there comes a time when it would just be alot better to switch to a better bike.

    Strip any special and expensive parts that are in great shape, and just move on to the next bike.
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  10. stoltzfii

    stoltzfii Been here awhile

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    Maybe, but I'm pretty sure they were both firing. Here are closer pictures.[​IMG][​IMG]
  11. Ever Onward

    Ever Onward Older,Wiser, Smarter

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    Outside plug looks mighty funky. Could be fouled out.

    You have alot of blowby past the rings. Im guessing you might have overheated the engine pretty bad, and cooked the rings. The rings will lose tension when roasted bad, then combustion can blow by. This cooks your oil, which wrecks the engine.

    Like Mongle mentions, its hard to diagnose from vid clip sounds, but you have issues no doubt. Sounds like it could be in the valve train even.

    Reguardless, its mighty loud, and losing a litre of oil every 500 miles means somethings really wrong. A bit odd your head isnt looking like a oil burn situation ?

    Oil leak elsewhere ? Whats the inside of the exhaust pipe look like ?
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  12. stoltzfii

    stoltzfii Been here awhile

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    Inside of the exhaust pipe at the header end is white.

    I think the main issue (out of many problems) is connecting rod play. I can move the rod up and down on the crank and here a clank noise. This is way too much movement, I belive.

    Here's a video, but it doesn't show it too well.

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  13. bobzilla

    bobzilla Dirty Old Man

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  14. StannisBaratheon

    StannisBaratheon Been here awhile

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    Update from the machine shop: Cylinder is serviceable and is being honed to break the glaze on the walls. Valve guides were out of spec and need replacement. Valves are serviceable. Everything is being cleaned up while I wait for parts to be delivered.

    So definitely good news. I was hoping it was just worn seals, but worn guides are better than a worn cylinder. Will continue to update as things progress.
  15. procycle

    procycle Long timer

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    Any up-down play you can feel is WAY too much. It's all over for that motor.
  16. JagLite

    JagLite Long timer Supporter

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    :hung :grim :pep

    Unfortunately, it looks like the end for that crank and rod.
    Anybody got a spare around there? :becca

    Of course not :dirtdog

    So, can you source any other used motor, from anything, that you can McGyver in there to get you the last 250 miles?
    Bicycle crank and pedals maybe?
    You just have to drag that DR to the end of the road!
  17. wee-twin

    wee-twin Been here awhile

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    The question I have is what caused crank and connecting rod to become damaged?
  18. procycle

    procycle Long timer

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    Unfortunately, that bike had some bad recent history. My guess to what happened is the broken carb slide resulted in the motor having to be run very lean for quite a few miles. The lean running resulted in prolonged detonation which pounded flat spots in the rod bearing rollers.
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  19. NC Rick

    NC Rick Cogent Dynamics Inc

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    It
    was very enjoyable and I can be a snob.
  20. NC Rick

    NC Rick Cogent Dynamics Inc

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    An you leave the bike there? Often that can be difficult.

    Sorry that your bike is toast.