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Thread: 1987 Suzuki Impulse GSX 400 X GK71E Restoration

  1. #46
    Join Date
    5th August 2017 - 09:40
    Bike
    1987 Suzuki Impulse GSX 400 X GK71E
    Location
    New Plymouth
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    26

    Fairing Update

    Have been working on the fairing. Some small repairs but otherwise good condition.

    Plasti coated, good stuff.

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  2. #47
    Join Date
    25th April 2007 - 23:40
    Bike
    the mighty fzr and gsxr
    Location
    central otago
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    1,337
    Quote Originally Posted by Mikael View Post
    The big find is that while browsing through a 1985 GSX 400 R workshop manual i have found that the carbs and break system is identical to the Impulse. This is great news as now I have a manual for those parts and many other systems that these two models share. The later model GSX 400 R used a different carb. This means parts availability has opened up a little wider now too.
    Made some progress. Have cleaned a lot of grease off the bike and have discovered a lot of the parts are in reasonable condition. The chain and sprockets are completely rust free and in good order.
    I have found the source of a couple of leaks (one of the cooling hoses is cracked and 2 fuel overflow hoses were hanging loose, so what I thought was an oil leak was just fuel peeing over the oily bike). Also found a broken air box hose connection from the top of the motor.
    Will try and do a compression test this weekend so I know what Im looking at.
    Need a new reg/rec as the system is overcharging at the battery.
    CDI seems in order.
    The lights and indicators all work (small blessing!).

    Attachment 332862Attachment 332863Attachment 332864Attachment 332865
    Are you sure you have a 1985 manual you speak of above?.

    The 86-87 gsxr400 is the same as the impulse but the motor on the 85 is a lot different.
    Have a full manual here.
    Great bikes and a lot of fun on track.
    Raced a 87 gsxr400 in cams for 4 years and then sold it.
    Still going strong last I heard lol.
    winding up stucky since ages ago

  3. #48
    Join Date
    10th December 2009 - 22:42
    Bike
    Honda Harley Suzuki Velocette and shit
    Location
    Canterbury
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    2,865
    Quote Originally Posted by kiwi cowboy View Post
    Are you sure you have a 1985 manual you speak of above?.


    Raced a 87 gsxr400 in cams for 4 years and then sold it.
    Still going strong last I heard lol.

    ...miss your smiley face around the traps too...

  4. #49
    Join Date
    5th August 2017 - 09:40
    Bike
    1987 Suzuki Impulse GSX 400 X GK71E
    Location
    New Plymouth
    Posts
    26
    Quote Originally Posted by kiwi cowboy View Post
    Are you sure you have a 1985 manual you speak of above?.

    The 86-87 gsxr400 is the same as the impulse but the motor on the 85 is a lot different.
    Have a full manual here.
    Great bikes and a lot of fun on track.
    Raced a 87 gsxr400 in cams for 4 years and then sold it.
    Still going strong last I heard lol.
    I have a PDF manual that claims to be the 85. The carbs and brake system are the same. I was just meaning that those 2 systems are the same on the 85 model. As for the engine yes it looks different. Thanks for the heads up about the engine. So can I use engine parts from the 86, 87 gsxr 400 models for the impulse?

  5. #50
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    13th June 2010 - 17:47
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    Quote Originally Posted by Mikael View Post
    I have a PDF manual that claims to be the 85. The carbs and brake system are the same. I was just meaning that those 2 systems are the same on the 85 model. As for the engine yes it looks different. Thanks for the heads up about the engine. So can I use engine parts from the 86, 87 gsxr 400 models for the impulse?
    Don't count on it....they played around with bore and stroke a couple of times.
    Only once it's in your hand and measures up identical should you believe it.
    Reason is a tool - remember where you left it..... The late, great, John Clarke

  6. #51
    Join Date
    25th April 2007 - 23:40
    Bike
    the mighty fzr and gsxr
    Location
    central otago
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    Quote Originally Posted by ellipsis View Post
    ...miss your smiley face around the traps too...
    Hehehehehe don't speak too soon. Me BAAAAAAAck.

    Booking dec meet soon.
    winding up stucky since ages ago

  7. #52
    Join Date
    5th August 2017 - 09:40
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    1987 Suzuki Impulse GSX 400 X GK71E
    Location
    New Plymouth
    Posts
    26

    Cheers

    Quote Originally Posted by Grumph View Post
    Don't count on it....they played around with bore and stroke a couple of times.
    Only once it's in your hand and measures up identical should you believe it.
    Ok thanks Grumph.

  8. #53
    Join Date
    5th August 2017 - 09:40
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    1987 Suzuki Impulse GSX 400 X GK71E
    Location
    New Plymouth
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    26

    State of things so far... Update 1

    So since found a manual for the Tokyo Tower and ordered brake seals front an rear. Scrubbed brakes clean.
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  9. #54
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    28th May 2006 - 19:35
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    suzuki
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    lower hutt
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    Quote Originally Posted by Mikael View Post
    So since found a manual for the Tokyo Tower and ordered brake seals front an rear. Scrubbed brakes clean.
    i very very rarely replace brake seals, there's never much that can get in there so with careful pulling apart, inspecting for damage and reassembling things are back to new.

  10. #55
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    13th June 2010 - 17:47
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    Quote Originally Posted by jellywrestler View Post
    i very very rarely replace brake seals, there's never much that can get in there so with careful pulling apart, inspecting for damage and reassembling things are back to new.
    Agreed. Because we don't salt our roads, it's the main difference between the restorations in the UK based magazines and the same job here.
    Brakleen and lashings of rubbergrease do me.
    Reason is a tool - remember where you left it..... The late, great, John Clarke

  11. #56
    Join Date
    25th March 2004 - 17:22
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    RZ496/Street Triple R/GasGas/ etc etc
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    Wellington. . ok the hutt
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    16,762
    Agreed, Though the outer dust seals can get distorted or worn and cause issues. Do spend time carefully cleaning out the grooves they sit in.

    I bought a kit for the same brakes as they were too far gone. Still not good enough. Master cylinder swap brought them back to life instantly.
    I've been told. Dreaming`s free.
    Think I'll go, back to sleep.
    Everybody listen, voices in my head
    Everybody listen, do yours say, what mine says?

  12. #57
    Join Date
    5th August 2017 - 09:40
    Bike
    1987 Suzuki Impulse GSX 400 X GK71E
    Location
    New Plymouth
    Posts
    26
    Quote Originally Posted by jellywrestler View Post
    i very very rarely replace brake seals, there's never much that can get in there so with careful pulling apart, inspecting for damage and reassembling things are back to new.
    I had to change the dust seals as they were stuffed so thought might as well do the lot.The last owner sadly neglected this bike.

  13. #58
    Join Date
    25th March 2004 - 17:22
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    RZ496/Street Triple R/GasGas/ etc etc
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    Wellington. . ok the hutt
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    Sheesh, Greg, whatda yathink? This little 400 is a pig to start.
    Thought I'd found a good reason when all the valves were tight as.
    Replaced a couple of plug caps which had gone silly. Dyna coils and std copper wire.

    But it just takes ages to start. Will fire and die repeat. Don't dare touch the throttle. Starts best with little or no choke. More choke forget it.
    Owner says all her 400s were dreadful to start. But I can't give it back like this. It's unusable.
    When it's finally hot it seems to start and run fine.

    Took it for a ride and screams along.

    Adjusted the idle mixture to reduce a lean lag off closed. But tried several settings and starting is just as dire. Choke plungers seem home.
    I've been told. Dreaming`s free.
    Think I'll go, back to sleep.
    Everybody listen, voices in my head
    Everybody listen, do yours say, what mine says?

  14. #59
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    13th June 2010 - 17:47
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    Well, funnily enough, I have a 250 GJ72A here at present with I assume the same twin choke carbs ?
    Got them stripped out and will be picking up some carb cleaner tomorrow.
    The idle mixture screws should be pulled - incl the springs, washers and O rings - and that passage cleaned.
    Lack of O rings there can cause a lean idle too.
    Float height ? vacuum leaks - particularly the hose to the tap ?

    Check the air gap ignition trigger/pickup. Close them up to around .010 - .012 thou. As they age they get less sensitive.
    Bit like me really....
    Reason is a tool - remember where you left it..... The late, great, John Clarke

  15. #60
    Join Date
    25th March 2004 - 17:22
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    RZ496/Street Triple R/GasGas/ etc etc
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    Wellington. . ok the hutt
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    Yeah I built 1 set of carbs from 3. Twin choke. As the designer should be. Diaphragms working.
    Vacuum plugged as gravity on gsxr. Floats unadjustable, Seemed undamaged plastic.

    But I never pulled the idle mixture screws. I'll check. Thank you.

    Presumably the air gap of the pick up coil is hard to check if attached, I assume, to the side cover and acting on a crank mounted flywheel?
    I've been told. Dreaming`s free.
    Think I'll go, back to sleep.
    Everybody listen, voices in my head
    Everybody listen, do yours say, what mine says?

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