New project GR650

Discussion in 'Old's Cool' started by radianrider, Jun 18, 2011.

  1. radianrider

    radianrider Adventurer wanna'be

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    Got it on the road today! Still a few minor things to tweek, but it is mine, it runs and stops correctly and I :D
    #21
  2. motoretro

    motoretro Been here awhile

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    Great find, you really brought back some memories. Seems like one of the magazines of the day did a project bike build on one of these. As a vertical twin they were pretty high tech for their time. I'm envious, looks like a neat project plus you got the much faster wire spoke wheel version:wink: Seems like the hot set-up was a PBI countershaft sprocket which lowered the H/W rpms without losing any power to speak of.

    Good luck w/ the project.

    Motoretro
    #22
  3. vtwin

    vtwin Air cooled runnin' mon

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    Cycle World claims it was a "Best Buy" at the time. Has the counterbalancer, oil jets under the pistons, cool free-wheeling flywheel, mono shock rear. D model has air adjustable fork preload.
    #23
  4. HEO30

    HEO30 Adventurer

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    Every time I see a GR I get fired up to work on mine.... So many bikes so little time/money. I recently sold off some motorcycles, there was a little interest in the GR. But there is something about the stance... I refuse to let her go until I finish her. Everyone who sees it loves it... Guess it was introduced a little late to capture enough of the american market. I also happen to have a good portion of a parts bike if you need anything...
    [​IMG]
    #24
  5. radianrider

    radianrider Adventurer wanna'be

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    Interesting. Got the rear brake pedal and pillion grab bar? Headlight brackets?

    Shoot me a PM.

    One of the PO's welded a homemade backrest on the bike and it wouldn't hurt my feelings to get rid of it.

    At some point, it was struck by a car and the rear brake pedal got bent.

    Other than that, this old gal is in pretty decent shape now.

    I identified another issue that I have to deal with. Apparently the O-rings between the cylinder heads and the carbs are a weak link and I need to replace them. Sucking air in around the boots and causing a lot of issues with popping and stumbling.
    #25
  6. radianrider

    radianrider Adventurer wanna'be

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    Pulled the carb intake boots today so I could install new o-rings. The old o-rings were like day-old spaghetti. Hard and crunchy. Crumbled as soon soon as I tried to manipulate them.

    The carb boots showed a lot of carbon on the flanges, so I figure they had been leaking for a while.
    #26
  7. Dabears

    Dabears Long Timer

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    Seems like this will make a good daily rider- Good original bike, only issues you've encountered seem to be from sitting or the couple of drops it's had. Perfect size engine as well. Nice project!
    #27
  8. radianrider

    radianrider Adventurer wanna'be

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    I think so, if I can get the bugs worked out. I'm not much of a mechanic, so I have to learn what I am doing, while doing it. A member of a Suzuki specific forum has offered to stop by and give it a once over for me.

    Figure he can point me in the right direction on some of the issues. It is at the very least, an exercise in developing patience.
    #28
  9. Fire Escape

    Fire Escape Long timer

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    has asked about the tires, so I will. How old are they? Doesn't matter that they hold air and have tread. If they are more than 5 years I'd give serious thought to replacing them, before finding out that they don't stop or turn well enough. YMMV

    The brake pedal will straighten out easily with heat (won't do much for the chrome but .... Take some measurements for where the actual pedal needs to be compared to the surface where it attaches to the pivot rod (so that it clears the engine case), take it off and drop by anywhere that does welding, they can make it work. I'd mark the end of the pivot shaft where the "split" in the lever is so that you only have to put it on once when you get it back.

    Looks like a fun project, especially so with almost all the parts already there. I think that with some patience and time (plus a hack saw and a file or two) you could make the sissy bar go away and have the grab bar look like new again. Nice thing about aluminum is that it can usually be polished back to look original. Remember to chalk your files before working on aluminum or they will quickly be covered with hard to remove chunks. Your engine cases and covers were probably clear coated when new, they will poish up nicer than they looked new but you will have to then decide whether to recoat them (makes them a little dull) or keep on polishing. Have fun.

    Bruce
    #29
  10. radianrider

    radianrider Adventurer wanna'be

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    I plan on replacing the tires when/if I get the bike running correctly. The front looks fairly new, but the rear has some issues. I'm running them only at low speeds in the neighborhood so I can test out the carbs. Once it runs correctly..they are gond.

    Took a propane torch to the brake pedal and straightened it out so it is at least useable, but I'm thinking your plan works better. Can't seem to get it hot enough with propane to get it where I want it.

    Have seen the grab rails for for $20 on e-bay, and given the time needed to remove the weld...not sure about tackling it with a file. I'll have to think about that.

    I've seen some threads on here with the cases stripped of clear coat and polish. I may go that route. Have a very nice Porter-Cable polisher that needs a workout once in a while.
    #30
  11. radianrider

    radianrider Adventurer wanna'be

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    Carbs are all torn down and soaking in carb cleaner. New o-rings ready to install. Hope I can get it running tomorrow. A Suzuki rider from gsresources came by and helped me get them torn down correctly.

    Can't wait to see if this resolves the issues I have been having with rough running.
    #31
  12. radianrider

    radianrider Adventurer wanna'be

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    Got the carbs back together. Need to remember how the choke assembly goes together and get the new intake boots installed.
    #32
  13. radianrider

    radianrider Adventurer wanna'be

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    Got it all back together and am now in the process of getting the carbs set up correctly. Pulls pretty good up to about 4k, then it gets pretty "vibey". Working on the air mixture set up. Valve adjustment to come shortly.
    #33
  14. Fire Escape

    Fire Escape Long timer

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    Consider doing the valve adjustment first, if there are any significant changes you would probably need to resinc the carbs afterwards.


    Bruce
    #34
  15. radianrider

    radianrider Adventurer wanna'be

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    Makes good sense. Thanks.
    #35
  16. radianrider

    radianrider Adventurer wanna'be

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    Did the valve adjustment...one was very tight.

    So far, have cleaned the carbs, replaced brake pads, replaced carb intake boots and o-rings, put new bars on. Have new rubber sitting in the garage and new steering head bearings as well.

    Making progress toward a daily rider.
    #36
  17. vtwin

    vtwin Air cooled runnin' mon

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    Your making good progress.
    #37
  18. radianrider

    radianrider Adventurer wanna'be

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    Took the carbs back off again. Didn't check the float level or try to bench sync the carbs the first time I had them apart.

    I adjusted the carbs a little bit and it runs much more smoothly at slow speed and pulls better higher into the rpm range. Still might benefit from a true carb sync.

    At this point I think I'm about done with the basics except for changing the tires. Mine are at least 11 years old. Bought Shinko 230 Tourmasters to put on. Just have to figure out how to get it done.


    Progress toward having a bike I can ride on a daily basis is being made!
    #38
  19. jbcaddy

    jbcaddy Long timer

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    glad to see any old bike get back on the road. good on ya:clap JB
    #39
  20. radianrider

    radianrider Adventurer wanna'be

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    #40