BS 34 carburetors

Jan_P

XS650 Guru
Top Contributor
Messages
1,596
Reaction score
2,729
Points
263
Location
Sweden
New Spark plugs
New Spark plugs caps ( One which did not have 5 K either )
New Ground wire to Coil
Started OK

And Ladies and Gentlemen --> 150 Yards and stalled again + Pushing it home.

I am next gonna bypass ignition Lock power to coil and ignition box
the ones are dodgy apparently on this model.
Since it stalls on both sides not running on one side --- I am at electrical problems

Have a stock regulator on the bike i can plug in --- and an extra rectifier at home to change to and also a Boyer Blue box with coil I can try.
( Installed is red box )

Feel free to comment .. If these are known symptoms on Boyer Coil or Red Box
 

650Skull

cry CRY BABY
Top Contributor
Messages
9,718
Reaction score
10,777
Points
688
Location
FNQ Australia
From Boyer site - instructions for XS650.........KIT00303


1655677086677.png
 

Jan_P

XS650 Guru
Top Contributor
Messages
1,596
Reaction score
2,729
Points
263
Location
Sweden
Thank you Mr Skull there is a difference in instructions
Kit .00303
Kit 00103

Jumped the Power supply to Coil and Boyer Box -- Bypassing ignition lock and kill wiring Did not help

Connected a stock regulator and on power up dim neutral light and Poff main Fuse. Gone.
out with that and in another stock regulator ..this time no Poff in fuses
Replaced the rectifier soldering and shrink wrapping
Replaced a few connectors But begun to rain not tested tonight.

I am still at electric problem ....since it stalls on both cylinders and Pri position makes no difference.

Maybe testing blue Boyer Box after this if this did not help

Not sure at this point in time if the cam allows Points installation.
I replaced it to a better looking Cam .. but took no notice about the point aspects since I was Planning use Boyer.

It appears to charge Brushes is on the short side --- And starts reasonable well
 

Jan_P

XS650 Guru
Top Contributor
Messages
1,596
Reaction score
2,729
Points
263
Location
Sweden
Boyer Coil is out of Spec 15.2 k ohm instead of 12.5--13.5 k Secondary
Primary side borderline Low 4.1 instead 4.2-- 4.6
Going for the blue Box which coil is within spec dont know about the box. yet.
 

Team Junk

XS650 Guru
Top Contributor
XS650.com Supporter
Messages
1,903
Reaction score
5,098
Points
513
Location
Central Texas
Jan your coil is within reasonable tolerances. If you want to test the coil momentary ground and unground the black wire from the coil and see if the plug sparks.
 

Jan_P

XS650 Guru
Top Contributor
Messages
1,596
Reaction score
2,729
Points
263
Location
Sweden
Jan your coil is within reasonable tolerances. If you want to test the coil momentary ground and unground the black wire from the coil and see if the plug sparks.

Will try that
Last check kicking it -- plugs against the head . Had spark but not strong
The right plug is still White
I remember adjusting the left idling mixture richer but not the right can that be an issue ?

Think i will try the Boyer Blue Box ..then the electrics is tested
And jetting adjustments to stock ( or so ) and see if that changes things
 

Jan_P

XS650 Guru
Top Contributor
Messages
1,596
Reaction score
2,729
Points
263
Location
Sweden
Took out the plugs and put them on the cylinder head + kicking
Muuuuch .. better spark on Left side There is one on the right side also but clearly not strong very weak
Seen sparks over the year this is weak Going for Blue Boyer setup

Edit there is a marking + and - on the coil .
Booth sparks weak if switched around
 
Last edited:

Jan_P

XS650 Guru
Top Contributor
Messages
1,596
Reaction score
2,729
Points
263
Location
Sweden
Boyer Blue Box installed spark looks better
Not started engine yet

Some pictures that perhaps can help someone

Holder for the Coil hacksawed off a piece of square tubing
drilled holes matching frame and coil .added 2 nuts on the bottom side as spacers to get it a little higher up


IMAG0081.jpg




Ignition box

IMAG0083.jpg


Wiring for testing Blue is Power in that forks to Coil and Ignition Box
The switch is for possibility to cut power feed that not components can withstand

The ground wires are collected in the bolt at the middle -- And one wire all the way to battery minus

I am off to try set the ignition timing and try to start see what happens perhaps test ride.


IMAG0082.jpg
 

Jan_P

XS650 Guru
Top Contributor
Messages
1,596
Reaction score
2,729
Points
263
Location
Sweden
First kick start up No stumbling .. some tests and tweaking the ignition. Not exactly there yet
Not the perfect response ..
But usable motorcycle now.
Right plug is still whiter but the left is also a little lighter
Will a idle mixture opening on the right help would prefer a little darker
And I am thinking adjusting the needle back or even one step further down more Please comment

As in --># 59
Since nothing in the electrics leaning out the needle it is already second from top
going for the top 1 slot if this seems wrong please tell

The stumbling is gone at the Moment ..coil was a bit out of spec ..but the wiring is poor. Maybe should get a new
so I am not certain.
Some ignition tweaking and settings on the carburetor perhaps it is solved .
 

Jan_P

XS650 Guru
Top Contributor
Messages
1,596
Reaction score
2,729
Points
263
Location
Sweden
Done some reading about the carburetor setup in the tech section

I Now believe I have had a Weak spark and tried to correct that via adjusting the carburetor
Setting the mixture screw left and right different to get rid of the popping in the exhaust. left side at idle
And had stumbling in the upper mid range that disappeared setting the needle in the topmost position
leaning out
( Theory is --- not actually to rich but to rich for the weak spark )
Now believing the spark is stronger ill try to set the mixture idle at 3 turns out on both sides
Setting the needle at third slot ( can be to rich but ill try that )

I now have a stock mechanical charging regulator installed that so far seems to work That I will try to keep . Having Lower Voltage drop at startup
which makes starting better
 

Jim

Beyond the edge is the unknown. Here be Dragons
Top Contributor
XS650.com Supporter
Messages
11,898
Reaction score
45,143
Points
813
Location
Kansas City Mo.
I Now believe I have had a Weak spark and tried to correct that via adjusting the carburetor
Never underestimate the ignitions ability to fool you into blaming the carbs.

Underskatta aldrig tändning förmåga att lura dig att skylla på kolhydraterna.
 

Jan_P

XS650 Guru
Top Contributor
Messages
1,596
Reaction score
2,729
Points
263
Location
Sweden
Moved the needle third slot from top
Stumbling predictably at 4200 rpm on acceleration.
Need to tweak the ignition a bit also slightly to late
I think I am Going down 1 step .. on main Jet have 135
 

Jan_P

XS650 Guru
Top Contributor
Messages
1,596
Reaction score
2,729
Points
263
Location
Sweden
EDIT my bad ,,2.85 can actually be right
found a link that gives. 2.75
Not going well.
Replaced the main Jet to 132.5 .
Could not start the machine + 30 C --- kicking like a fool

Coil partially shorted ---
Have sent e mail to Boyer Bransden if this means shorted Boxes also .. Red and Blue ( feel free to tell your opinion)
I Twisted the magnet with plugs on the cylinder head and had spark ( With jumped wires ) ..but weak again.
Looks as the fuel prices wont hit me this summer.





IMAG0085.jpg
 

Attachments

  • IMAG0084.jpg
    IMAG0084.jpg
    318.7 KB · Views: 6
Last edited:
Top