Gs550T timing issue

[EricWoods]

Hi everyone. Just a question on the timing on my American import GS550T. Ok it originally had electronic ignition which appears faulty. At the weekend I put in a boyer bransten converstion. Now the stator that came with the kid has elongated holes which allow setting of ignition timing. According to the instructions that came with the pack i set the ignition timing mark to "T". Then set the rotor so it is between the magnetic contacts. Then time to the "F" mark at 4500rpm. But in the Clymer book it says my timing should be as follows

15 degrees BTDC at 1400rpm
40 degrees BTDC at 2250rpm

Anyone know the steps i need to take to time this right. I think the timing is set by moving the stator plates around within the elongated holes. Ive got 3 timing marks, "T" the one with no label then "F"

Any help? Desperate to ride this machine B4 xmas!

Eric
Dublin

[srsupertrap]

Hi Eric,
You are close and on the right track. Yes, timing is set by moving the stator plate back n forth thus adjusting the timing. That's the next task to complete. With the bike not running, loosen the three screws and move the stator plate so the screws are centered within the elongated holes; tighten the screws slightly. This is a good starting point.

Follow the Boyer instruction; disregard the 15 & 40 BTDC. You are not using a timing wheel. Start the bike, Install your timing light on the cylinder 1. Hopefully the GS started much easier this time? The timing mark with no label should be aligned below 1500 rpm. If it is not loosen the screws adjust the stator plate so the mark is aligned. Next, rev it 4500 rpm and the F mark should be aligned. Tighten the stator plate.

[EricWoods]

Hi re timing again! Im lost

Thanks for your reply regarding the timing issue on my bike. Im a bit confused about the timing as once a set the stator in place say at 4500 and realise its not timed below 1450rpm how can i adjust without altering what ive already set at 4500rpm.

Here is a quote from another contributor

I fitted a Boyer Bransden unit to my GS550 and it's the best thing I ever did.
I believe that you may need to readjust the ignition timing. The instructions state to time to the full advance mark at 4500rpm.
The full advance mark on the GS550 is the unmarked one (the third line).

The F line should be aligned below 1650rpm.

I also had problems reattaching the cover and solved this by making a cardboard gasket which gave me just enough clearance.

Kinda confused as my bike has 3 marks. First is "T" the a blank Line then "F". So wheb the engine is static what should i align when the rotor is in the magnet position?

Help

[chef1366]

Set the timing at idle or below 1500 rpms to the F timing mark. If you have a good mechanical advance that should take care of the rest. If you have an electronic advance I don't know.
A good place to start is line the crank trigger up with the 1&4 while the crank is lined up with the 1&4 F timing mark.

[EricWoods]

Thats great

Thanks for help. I will set rotor between the 2 magnets and set the 1-4 timimg mark to "F". Hopefully that will work. I originally set the rotor between the magnets and set it to "T" and the bike ran rough. Hopefully setting to "F" will help

Eric
Dublin

[chef1366]

T is for top dead center for setting the cam timing. F stands for fire to send the signal to the coils.

[EricWoods]

I thought that

Yeah i thought that but in the instructions that came with my new kit it has it marked as "T" for static timing. " F" Fire makes more sense!!!!!!!!!!!

Eric
Dublin

[tone]

Boyer bransen have been making ignition systems for years matey, just go by exactly what it says in their instructions & you will be fine :-D

if this model of ignition unit has an electronic advance curve built in which i suspect timing it any other way than the above could cause problems :shock:

[EricWoods]

hi Tone

Just going to quote intructions for setting the timing according to boyer instructions.

Bear in mind that my bike is a us import and that It had electronic ignition before i fitted this kit

No14. The method of timing as shown on diagramis first to set the engine to the "T" Top dead centre positionmark on 1 and 4 or 2 and 3 cylinders. Move the rotor to the position where the magnets are in line with the centre pole pieces on the stator plate. Tighten the centre bolt. Start engine and run for 5 minutes.
Connect strobe lamp and time to the full advance mark, with the engine running at 4500rpm. Alin by moving the stator on its slotted holes.

I have done as stated above but bike runs like a dog! Hence i just thought maybe a setup the static timing wrong. Thought bike wouldnt start set to TDC.

Any takers

[tone]

hi eric the i've fitted a couple of boyer ignitions & never had a problem so the only things i can think of are .......

did you set say 1&4 to the T mark then your timing light to # 1 ?

Is the magnet on the rotor in a little raised bump & if so is it central to that bump ? with some ignitions they are slightly ofsett !

Are you sure it was an ignition fault causing you problems in the first place ? can you give us more info as to what caused you to change over to the boyer

clutching at straws a bit i know but trying to figure out whats happening here as they are not usually a problem

[EricWoods]

Hi tone

Hi tone thanks for your help. My ignition system was coming and going and decided for peace of mind to stick a new one in.
my rotor sits on a shaft with a flat end allowing for a nice seated position of the rotor. I was just confused as some replys were saying I should set engine mark to "T" when engine off and others were saying "F" and others were saying 3rd mark.

Before I get into the timing issue tomorrow on my day off, I have noticed that the airbox seal is completely gone and also there are 2 jubilee clips missing from the air side of the carbs where they sit into the air box booth. Afraid now she could be drawing in 2 much air and probably best reslove that problem before setting the timing in the morning.

Does that sound ok?
Thanks
Eric in dublin