Subject: RE: Cam Noise/ carb synchronization
Author: Peter Scheer
Date: Dec 17, 2000, 9:59 AM
Post ID: 1704500364
Karl
The carb idea could be it.
I was given this carb synchronization tip from a Harley mechanic and MG
Sport guy. I don't have a hole in each intake manifold so I couldn't do the
vacuum method. This mechanical syncho method seemed to work well for me.
Objective is to get the slides to be at equal openings at all throttle
settings.
for idle, both throttle and choke cables should have free play. Get a
drill bit the same diameter as the opening between bottom of carb opening
and bottom of slide. Check both sides and adjust with idle speed screw,
the lowest one on carb. Use the drill as feeler gage to mechanical set the
openings the same. You may need to experiment with diameters to get the
speed right.
You want to end up with idle around 1000--1200
For higher rpm settings, open throttle part way, find another round object
maybe 1/2-3/4 inch dia. put into one side and back off throttle until slide
just touches. Check both sides. My machine seems to have no return spring
force so the throttle stays fixed wherever I leave it.
Use the cable adjusters from each carb to set the slide so that the feeler
just fits through.
adjust the cable form the splitter to handlebar last to allow some free
play.
close throttle
double check that, the slides both open simultaneously from idle setting.
The idle fuel/air mixture was set by warming up the motor , then with
choke closed, do one side at a time, turn in screw until
speed slows, then back out. speed will increase then suddenly decrease
as you back out. count the number of screw turns as you do this. go
back half way. this should be the mid range of fuel air mixture.
You may have to re set the idle speed screws after this to stay in the
1000-1200 range. Just move both the same amount up or down to keep the
synchronization.
This mechanical synchronization worked well for me, much improving the idle
and mid range smoothness. I have run it through all 4 gears and have had
smooth acceleration no knocking.
I admit I have not run the machine at all at highways speeds since the tires
were dry rotted when I did the synchronization.
Anyway, I cant say this is the best way, but would seem to be at least a
way get in the ball park if you are grossly out of synch.
Good luck
-----Original Message-----
From: Karl Kologiski [SMTP:jane-@gte.net]
Sent: Saturday, December 16, 2000 10:56 PM
To: 'PEHA-@aol.com'; 'Loopfram-@topica.com'
Subject: RE: Cam Noise
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My bike is a Ambo with timing gears, I was talking to a guy who had
a V700
and he said his bike started making a racket and it turned out to be
the
cam bushing. I am going to do some more investigating before I tear
into
the motor. Hopefully it is something minor.
I was playing with it tonight and noticed the throttle felt funny
and one
of the carbs seemed out of sink. It seemed like one of the cylinders
was
trying to play catch up with the other one. It is possible that
could be
the problem. If the throttle is 3/4 turned at 4-5000 rpm and the
slides
are way out it could starve one of the cylinders for fuel, putting a
load
on the other one. The noise going away when I accelerate the would
make
sense because when I accelerate the accelerator pumps would kick in
feeding
the starving cylinder. I know it sounds crazy but I have had a
similar
thing happen on my BSA lighting. One of the adjusters on the
throttle
cable backed off and the slide in one of the carbs would only open
1/2 way.
The ambo has the original 1 into 2 cable on it. I am going to
strip the
carbs and install a duel cable system with a T3 throttle just to see
what
happens. I will let everyone know how it turns out.
Jane & Karl Kologiski
Bird at the Wheel - Motorcycle Arts-
St. Petersburg, Florida
Visit our web site at
http://home1.gte.net/janemac/bird.html
-----Original Message-----
From: PEHA-@aol.com [SMTP:PEHA-@aol.com]
Sent: Saturday, December 16, 2000 5:52 PM
To: jane-@gte.net
Subject: Cam Noise
In a message dated 12/16/2000 2:47:20 PM Pacific Standard Time,
jane-@gte.net writes:
> Kind of like a loose
> timing chain will make noise
Do you have Eldo or Ambo? all of the Ambo should be timing gears.
Early
Eldo were gears, but later Eldo were chain. Mine made a noise
somewhat as
you describe. It was an earlier Eldo with timing gears. I also
suspected
fore/aft movement in the cam.