Question
dont have pic
i have done everything i know how to do did the carbs spark plugs wiring an more turns over wont fstart an i got great spark an new gas its a 74 i tryed alot of things but it wont start
AnswerHello Harry,
To get the CB360 running you need a reasonable
compression reading, probably no less than 130 psi
but higher would be better.
If the valve clearance is too tight you might
be loosing compression there.
With the "T" mark aligned on the flywheel or rotor
one of the cylinders will be on it's compression stroke.
The valve rocker arm should just have a perceptible
clearance at this point. About .002" minimum.
Turn the engine a full turn and align the "T"
mark again and the other cylinder valve rockers
should have some clearance.
Sometimes they use "LT" or "RT" marks for left and right
cylinder top dead center indicators.
Main thing is that you have some compression or it will
never start.
Next thing is that carbs are very clean as the
jets can plug easily. Fuel supply from
the tank should also be checked.
If it has contact points they have to be set
to open when the "F" mark aligns.
When the left cylinder is on compression
stroke the left set of points will just
break open on the "LF" mark.
On these it is possible to install the center
cam on the points advance unit 180 degrees out.
This makes the spark happen at the wrong time.
The advance is the unit behind the contact points plate.
If you have compression and your spark
is at the correct timing then you can
try spraying something like wd40 into
the carb mouth. It should fire on that
if the compression and ignition timing
are correct. If it does then you know the
fuel system needs more work.
You need compression, fuel, and spark at the right time
to start the engine. Eliminate each one carefully
and it should start.
Taking care to make sure the spark is happening
on the compression stroke may help.
The valve rockers will have a slight clearance
when the cylinder is on compression.
Then align the "F" or "LF" for left side
and see if the points are just ready to
break open. When the points break the spark
happens. http://oldmanhonda.com/MC/Rtiming.html
Other than the above I think only plugged carb
jets might be the answer. They have to be
cleaned physically with a smooth small wire like guitar
string or maybe even fishing line.
Soaking the carbs in yamaha brand carb cleaner
may clear any plugged passageways.
Let me know if you get any new info.
Wayne S.
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