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Author Topic: 1984 Yamaha FJ 600- Rise of "The Mighty Jig"  (Read 42520 times)

Offline Kickeroo

  • Posts: 126
Re: 1984 Yamaha FJ 600- Rise of "The Mighty Jig"
« Reply #70 on: Sep 20, 2013, 13:00:32 »
Ok, kids, and kittens....it's a milestone day.

Long story short....had to sell my Thruxton to pay bills, my 01 V11 Sport is in hospital with a total engine rebuild, so my attention turned back to this old girl.

10 AM EST, after 17+ years of being ignored, forgotten and written off.


It's revving like hell, and I'm turning the idle adjuster to no avail.  Any suggestions?

Offline ApriliaBill

  • Posts: 846
  • Yeah...I'm old school.
Re: 1984 Yamaha FJ 600- Rise of "The Mighty Jig"
« Reply #71 on: Sep 20, 2013, 13:14:11 »
I've had this happen many times. go back and make sure the carbs. are ceaded right in the intakes and that you didn't over tighten the clamps. It's a vaccum leak and it is 99% at the intake. also did you at least bench sync the carbs.?
"Do not neglect to show hospitality to strangers, for by this some have entertained angels without knowing it."

Offline ApriliaBill

  • Posts: 846
  • Yeah...I'm old school.
Re: 1984 Yamaha FJ 600- Rise of "The Mighty Jig"
« Reply #72 on: Sep 20, 2013, 13:19:02 »
PROJECT IS NOT DEAD!

Getting to the dirty stuff, at last! Rear shock and swingarm removed.  I have SOME parts that I pre-bought on reccommendations of stuff that usually needs replacing.
 
Got the word from my buddy (Brooks cycle center, in Northern VA) that the carbs are ready to ship, thus, the reason I go my tail into gear to go over the hindquarters.
 
One other project is to use some 3M plastic cement and web-type-stuff to strengthen the mouting tabs on the new-to-me replacement fairing I bought about a year ago.  With the age of the stuff, the ABS is probably leaning towards being brittle, so I think that looking into a way to bolster it up without going redneck (i.e. duct tape) on it would be in my best interest.

See if you can spot the $50 in this picture.

How about taking that belt over to NAPA and have them look. Probably something you could order. I buy lots of "motorcycle" parts from NAPA. They think I'm nuts when I walk through the door, but you'd be surprised how many times I find stuff I can make work. I have a 84 FJ600, it doesn't have that belt, maybe p.o. swapped the shock...



If you guessed THIS part, you win.  It's the rear shock adustment belt (Yamaha part number 33M-22266-00-00) that is about $50 shipped, no matter where I get it from.




Why it has to be replaced.


The swing arm, pre-gumk removed.  it's about 35 degrees out, and I'm about to take a pressure washer to it.



The rear shock.  There's still some blue paint on the spring.  Really.


One word.  yuk.

"Do not neglect to show hospitality to strangers, for by this some have entertained angels without knowing it."

Offline Kickeroo

  • Posts: 126
Re: 1984 Yamaha FJ 600- Rise of "The Mighty Jig"
« Reply #73 on: Sep 23, 2013, 14:35:53 »
I've been checking, and checking and checking for a source of a vacuum leak.

Carbs are evenly installed, so they are not crooked in the inlets.

The vacuum lines (from carbs 1 and 4) back to the fuel petcock are intact.  The shared vacuum pressurization lines (carbs 2 and 3) do not seem to be compromised

There is nothing (i.e. the choke cable) putting any "pull" on the throttle cable

The clamps on the inlets seem to be snug, but I don't have anything other than "feel" to determine if they are too tight, too loose, or just right.

But still the bike comes to life screaming.

Is there something obvious I am missing?

Offline Bozz

  • Posts: 700
    • not nearly cool enough website
Re: 1984 Yamaha FJ 600- Rise of "The Mighty Jig"
« Reply #74 on: Sep 24, 2013, 10:17:12 »
It is very possible that something didn't get reassembled correctly in the carbs.
Slides could be spun out of alignment, main needles could have a washer below rather than above, you can swap air/fuel jets on some carbs too.
If you separated them, you could have the synch linkage wrong with 2 washers on 1 side rather than sandwiched.
Your choke linkage could be wrong.  (buddy scored a cheap bike that didn't run because the choke lever was mis-assembled.  20 min later it ran great)


You get the point.  There are a lot of tiny parts and it is easy to make a mistake.


First, I'd try leaving the carbs in the bike but disconnecting the throttle and choke cables from them.
Then see if the idle adjustment will work for you.  (removing possible culprits, trying to isolate the issue to the component level at least.)
If no change, then pull the carbs and get to work.


Don't panic.


This is actually good news, because it RUNS!  so you know it's likely not an ignition issue, or valve timing or any of the other systems.


This is almost certainly a carb/air leak issue.  (but sometimes throttle cable issues can disguise themselves as carb issues, so pull them out of the equation to make sure)


Take your time and be methodical.  You'll find it.


So nice to see one of these coming back to life.  Well done!


Good luck!
Cheers!
-Bozz

(All opinions worth less than you paid for them!)

05 FZ6 - 99 ZRX1100 - 93 GSXR750 - 82 GL500 - 78 GL1000 - 77 KZ900 - 77 CX500 - 60 R60

Offline Kickeroo

  • Posts: 126
Re: 1984 Yamaha FJ 600- Rise of "The Mighty Jig"
« Reply #75 on: Sep 24, 2013, 20:04:23 »
It's 99% the throttle cable, from what I can ascertain.


Idling like an angry kitten now.  Purrrfect
« Last Edit: Sep 25, 2013, 22:15:12 by Kickeroo »

Offline Bozz

  • Posts: 700
    • not nearly cool enough website
Re: 1984 Yamaha FJ 600- Rise of "The Mighty Jig"
« Reply #76 on: Sep 26, 2013, 11:19:47 »
Eggggselent!


Minor bullet dodged.  Onward and upward!
Cheers!
-Bozz

(All opinions worth less than you paid for them!)

05 FZ6 - 99 ZRX1100 - 93 GSXR750 - 82 GL500 - 78 GL1000 - 77 KZ900 - 77 CX500 - 60 R60

Offline Kickeroo

  • Posts: 126
Re: 1984 Yamaha FJ 600- Rise of "The Mighty Jig"
« Reply #77 on: Sep 26, 2013, 22:26:51 »
Now to tackle the incidental intermittent electrical issues

Offline Kickeroo

  • Posts: 126
Re: 1984 Yamaha FJ 600- Rise of "The Mighty Jig"
« Reply #78 on: Sep 27, 2013, 18:39:10 »
All electrics, with exception to brake lights, are present and accounted for.

It was 21 years ago TOMORROW that, with $500 cash and a vague idea of used bike shops around the Philadelphia area, I set out to find something new-to-me.  That $500 turned out to be a down payment on $1600, but you get the idea.

Anyway,  I decided to put my better judgment on the shelf and take it for a lap around the neighborhood.  Fortunately, my GoPro decided to come along.

Quick review: Steering is SUPER LIGHT, and, well, feels a bit off centered.  This bike was punted by a garbage truck in 94, but outside of cosmetics, I never thought there was any frame damage.

Could be I'm just spoiled with how great my Thruxton was, and V11 Sport is...or at least as I remember it.

It's a fun little video, to me at least.  Song makes me tear up every time.

Offline Kickeroo

  • Posts: 126
Re: 1984 Yamaha FJ 600- Rise of "The Mighty Jig"
« Reply #79 on: Oct 03, 2013, 16:51:46 »
Would anyone have a clue as to WHY I have, what I'll call, an intermittent starter motor? Sometimes the bike cranks, sometimes it doesn't. Starter relay sounds like its doing its thing, and all other parameters (bike in neutral, start switch on, key turned) are accounted for. Is there an optimal voltage I need to keep charging into the battery? Does the old-school "hit the starter motor with a hammer" trick apply here? Just curious.