Author Topic: First GTO rides - Vibration, any suggestions or thoughts?  (Read 112 times)

0 Members and 1 Guest are viewing this topic.

Offline BRT-GTR

  • Brian
  • Trade Count: (0)
  • Master Registered Bridgestone Member
  • *****
  • Posts: 622
First GTO rides - Vibration, any suggestions or thoughts?
« on: August 28, 2017, 10:22:11 AM »
      GTO imported from States, previously rebuilt engine (by good builder), NOS carbs and many new parts. Have gone through the bike, checking, refurbing, cleaning, lubing, adjusting, etc to put her in as good a mechanical condition as I can get it. Has new pistons in old bores. Probably genuine 3K on the clock but not original engine. New coils, points and condensers fitted.

     Took her for first ride the other evening keeping the revs down below 4000.  Running very rich, better when pulling or on the overun but coughing and spluttering at light load.  Pulls well low down but after warming up was reluctant to accelerate over 45-50mph, as though she was running on one cylinder. Engine generally noisy with more vibration than I would like or remember, thought left cylinder didn't sound right, not coming on song. Good news - the brakes  are brilliant.

  So, put in alternative coils,  new condensers, plugs and pulled the left disc cover. Disc reluctant to come out, but with a couple of thin blades was able to gently work it off the splines. Couldn't  budge the pin holding the disc collar. Now it is my understanding the discs should be free to move laterally on the collars so they can seal against the outer cover on primary compression. Problem ? the base of the collar splines had been 'sealed?' with loctite. Disc was stuck solid.  So freed it off and refitted. Also dropped carb needles to second slot.  Has significantly improved the starting/idle and a slight improvement on top end but still vibrating. (Checked the right disc when a wobbly clutch drum was replaced, looked like something may have jammed the primary drive in the past?),

    I'm running out of ideas but this may be significant. Although the primary gears are correctly timed, I had to turn the alternator and points plate fully clockwise to time  the ignition. Couldn't quite get both sides spot on using crank dimples , maybe a degee or two imbalance, so split the difference   . Will check the timing on the pistons today.               There is very slight play in the main case bearing behind the clutch but I'm beginning to wonder if the crank has 'moved'.     Any other suggestions ?

  Brian, not a happy bunny at the moment.
         
« Last Edit: August 28, 2017, 03:10:18 PM by BRT-GTR »
Growing old is compulsory, Growing up is optional.

 


Gallery


Views:34
Comments (2)
By: OldSwartout

Views:47
Comments (2)
By: AlanJohn

Views:32
Comments (0)
By: AlanJohn

Views:35
Comments (0)
By: AlanJohn

Classifieds

unobtanium for sale
Price: $0.00
Date: 11/20/2017 12:51 am
Time Left: 87d 15h 16m
Steering Damper rod needed for GTR 350
Date: 11/03/2017 10:07 am
Time Left: 70d 23h 32m
Bridgestone Sport 100

Price: $175.00
Date: 10/31/2017 09:31 am
Time Left: 67d 22h 57m
1970 Bridgestone DT 175
Price: $1200.00
Date: 10/28/2017 06:08 pm
Time Left: 65d 7h 34m

Recent Downloads added

How to build a 149 mph 350GTR....
Rating: (None)
Filesize: 7154.56KB
Date: April 18, 2017, 08:25:38 AM
Bridgestone 100 Sport Brochure
Rating: *****
Filesize: 937.72KB
Date: July 08, 2015, 12:58:53 PM
BS 100 Sport Australian Brochure
Rating: *****
Filesize: 937.53KB
Date: June 29, 2015, 06:40:40 PM
Bridgestone 350 GTO - Moto L├ęgende May 2003
Rating: *****
Filesize: 9429.41KB
Date: April 22, 2015, 04:18:43 PM

Powered by EzPortal