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the DR650 thread

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

  1. kezzajohnson

    kezzajohnson kezza

    Joined:
    Apr 17, 2007
    Oddometer:
    3,896
    Location:
    Cairns - Queensland Australia

    Careful Nogood - he only wants you for your welder. :drif
    ER70S-2, Lil' Steve, NC Rick and 3 others like this.
  2. sh4kes

    sh4kes Been here awhile

    Joined:
    Oct 17, 2012
    Oddometer:
    552
    My wrist pin looked like that @ around 65,000km. No idea whats normal as its the only engine I've gone that far down the rabbit warren with.
  3. Nogoodnamesleft

    Nogoodnamesleft Long timer

    Joined:
    Jun 9, 2015
    Oddometer:
    7,450
    Location:
    Brisbane

    :photog:photog:photog

    i'm fine with that,
    and everyone in this thread will get an invite to the wedding..

    i reckon @cyberdos is a smart bloke too.
    i figure he's probably already spoken to @procycle and set up a wedding gift registry for us at procycle.. :lol3:rofl:lol3
    fridge or toasters be damned, a proper wedding gift is a 790 kit. :D

    a lot of folk here might think i'm just a dumb aussie, but i'm secretly playing the long game for the benefit of my DR.. :thumb:lol3
  4. thump!

    thump! Adventurer

    Joined:
    Jan 16, 2007
    Oddometer:
    5,307
    Location:
    Northeast Tennessee
    Lots of "wet" carbon. Worn cylinder and rings. Smoking on startup and later smoking all the time. So, is it possible that what we're looking at here is the effect of long term overly rich carburation?
    Mongle, TreasureState and NC Rick like this.
  5. StannisBaratheon

    StannisBaratheon Been here awhile

    Joined:
    Jun 28, 2017
    Oddometer:
    561
    Location:
    Dragon Stone
    I looked and did not see any dot on the second ring. Will post pics later tonight.
  6. kbuckey

    kbuckey Long timer Super Supporter

    Joined:
    Dec 6, 2005
    Oddometer:
    1,671
    Location:
    Sedona, AZ
    Did switch to prime. Seemed to help a tiny bit - but that might have been my imagination. I'm going to check the air and fuel filter today.
    drmiller100 and TreasureState like this.
  7. William Wolfen

    William Wolfen DR Guy

    Joined:
    Dec 5, 2015
    Oddometer:
    3,038
    Location:
    Cypress, TX
    Stripped fasteners, unknown maintenance, unknown treatment, difficult to diagnose problems... yep, buying new was worth it!

    Sorry it's being such trouble for you. You've got the best DR minds right here, and we'll do all we can to help!
  8. Mongle

    Mongle Knuckle dragger

    Joined:
    Dec 4, 2009
    Oddometer:
    11,860
    Location:
    North Carolina Y'all
    Very possible. When I first saw the picture of the exhaust port I mentioned it.
    Anthiron likes this.
  9. sandwash

    sandwash Long timer

    Joined:
    Oct 26, 2007
    Oddometer:
    2,795
    Location:
    Az 7000'
    Anybody know the dia of the preload spacers for the forks,the ones on top of the springs?I want the get some pvc and cut to size. Thanks
  10. TrophyHunter

    TrophyHunter Long timer Supporter

    Joined:
    Aug 30, 2009
    Oddometer:
    3,791
    Location:
    San Diego
    Went out and measured mine. Just shy of 1.5 inches. I think I used 1" Sched 40 on my last DR and it worked fine.
  11. Kommando

    Kommando Long timer

    Joined:
    Nov 28, 2006
    Oddometer:
    12,053
    Location:
    By the Great Lakes
    Can it be one of those "open" relationships?
    Fishnbiker and Nogoodnamesleft like this.
  12. Mongle

    Mongle Knuckle dragger

    Joined:
    Dec 4, 2009
    Oddometer:
    11,860
    Location:
    North Carolina Y'all
    The ones I made on the lathe before I got DDCs measure: 1.445" OD
  13. Mongle

    Mongle Knuckle dragger

    Joined:
    Dec 4, 2009
    Oddometer:
    11,860
    Location:
    North Carolina Y'all
    Took out some pistons today with little run time on them and a good example of ring contact.

    First picture you can see the dot on the second ring showing up. IMG_20180913_132256848.jpg

    In this picture the top ring is a D faced (or some call it a barrel face) Moly ring. The wear is in the center and doesn't go all the way to the edges.

    Second ring is a reverse taper. You cans see a light wear (shiny) mark on the bottom of the ring. That is the only part that touches the cylinder wall.
    IMG_20180913_132208198.jpg
  14. Mongle

    Mongle Knuckle dragger

    Joined:
    Dec 4, 2009
    Oddometer:
    11,860
    Location:
    North Carolina Y'all
    I find US stuff has a dot showing up orientation. Foreign stuff often has a letter. Most I see have the letter "N". Not sure why N, maybe the non-US guys can chime in and break the code for me.
  15. sandwash

    sandwash Long timer

    Joined:
    Oct 26, 2007
    Oddometer:
    2,795
    Location:
    Az 7000'
    Ever see a triangle stamp on a ring before?
  16. Redfish Hunter

    Redfish Hunter Long timer Supporter

    Joined:
    Jun 25, 2018
    Oddometer:
    1,051
    Location:
    Prairieville, Louisiana
    Piston or finger?
    TrophyHunter and Fishnbiker like this.
  17. Mongle

    Mongle Knuckle dragger

    Joined:
    Dec 4, 2009
    Oddometer:
    11,860
    Location:
    North Carolina Y'all
    Can't say I have. Mahle (Germans) put an "M" for Mahle on theirs. Most stuff they send to us dumb Americans also has "TOP" written out on it. They want to make sure. LOL
    Fishnbiker and JagLite like this.
  18. Brutalguyracing

    Brutalguyracing Long timer

    Joined:
    May 15, 2013
    Oddometer:
    3,288
    Location:
    Long Island New York
    All.i could find
    Will report back next week
    KIMG2445.JPG
    Ever Onward, cyberdos and yehaaa6 like this.
  19. thump!

    thump! Adventurer

    Joined:
    Jan 16, 2007
    Oddometer:
    5,307
    Location:
    Northeast Tennessee
    Thanks for the flashback! Aside from the riders (Joel Robert was pretty awesome!) a couple of things struck me. First was the simplicity of it all. These riders were the creme-de-la-creme of the motocross world yet they were traveling in small conversion vans using trailers that would likely not pass most vehicle inspections today. Factory sponsorship back then likely consisted of a bike (if you were top tier) or maybe just tires and parts. Secondly, was the almost complete lack of safety equipment for both riders and spectators. Not even ear plugs and those bikes were LOUD. I suppose the full face helmet was yet to be "invented" in 1970. However, they were running those front of the front fender mud flaps we discussed the other day. ;-) Interesting.
  20. Rusty Rocket

    Rusty Rocket Life behind "Bars"

    Joined:
    Dec 22, 2005
    Oddometer:
    16,118
    Location:
    Tri- Cities TN
    lotta Maico's in that vid. Maico got the holeshot in the first moto on the tape. I like the strategy of fish-tailing and knocking down as many competitors as possible right off the bat. :photog
    Nogoodnamesleft, JagLite and FR700 like this.