Basically, I am just helping a friend get some information on how to time tune (or may be the correct word is synchronize) the byke. is there a guide about how to do this? or, can you help?
Your question is a little vague but I can definately help with bike as I have had tons of experience with the old CX 500's. Timing on a CX, that is to say ignition timing, is electronic(cdi) & is prity much set & forget
( If at some stage anyone was to do a cam chain replacement- be very careful to mark the pulser trigger position as you can set these 180 degrees out).
Still, if you want to check the ignition timing- here is how to do it.
Under the left hand carby-on the rear crankcase cover is a fairly large(50mm) plug-with a hex drive-17mm if I remember correctly.
Remove this plug.
Using an induction timing light connected to the L/H cylinders H/T lead- shine timing light into hole & you will see the timing marks. It should fire at the "F" mark-- when reved it should advance.
OK - As far as SYNCRONIZATION is concerned- you may be talking about carburettor sync.
This is where you compare/adjust the inlet manifold vacumes so that both cylinders are equal.
You would first need to purchace some vacume guages. You can get them from bike shops & of course e-bay-there prity cheap now & usuall come with adaptors that would suit the CX.
You would also need a carby balance adjusting tool. It' like a super long flat bladed screwdriver that goes inside a super long extended 8mm socket. "Motion Pro" do one, as do M.C.S hear in OZ. Again web search or see your local dealer for one.
You will also need a long piece of fuel hose to suit your bike & a hose joiner to suit.
Now -remove the petrol tank
Place on bench next to bike(I actually use a remote tank on a stand with my vacume guages mounted to it)
Connect long piece of fuel hose to the tank & using the joiner connect it to the bike- the tank needs to be higher than the carbys-
Now you have to fit the carby balance guage adaptors to the bike-They are located on both heads in front of the inlet manifolds-5mm philips head screw with alloy/copper washer under it.
Fit the adaptors to the manifolds & the gagues to them
Your ready to go- Start the bike and compare the vacume readings.
If they are different you adjust them using the carby balance adjusting tool. the adjuster is in between the two carbys in the centre -looking down on the carbys- 8mm locknut over flat adjusting screw.
Adjust-stop bike-open the throttle wide open -let go-- (let the throttle snap back on its seat to settle the mechenism after each adjustment)
this re-seats/settles the adjuster-
start bike a check again.
Set your mixture screws to 1.5 to 2 turns.(from underneath each carby-at the front)
Just be sure that adjusting the mixtures didn't affect the balance
readings & thats it.
Re-assemble the bike & the jobs done
Hope this helped
Regards Andrew
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