help with gk76a timing

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sa 71
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help with gk76a timing

Post by sa 71 » Thu Feb 28, 2013 11:01 am

Hi guys,
I got a gk76a last summer after passing my license, used it for a few months then noticed it was burning a bit of oil so decided to have a look and see why. I found the valve clearances to be very tight and think that is why... anyway long story short, I've broken the engine down and rebuilt it and now it won't start. All I keep getting is a pop in the exhaust and in the carbs. So I'm guessing the timing is off. Anyone know how I can check if the timing is correct or has been played with as I've set the timing using the 20 links etc...

Any help will be much appreciated, I'm at the end of my tether with this bike now...

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Re: help with gk76a timing

Post by Variablevalves suck » Thu Feb 28, 2013 1:04 pm

You sure you got the plug caps on the correct plugs?
Get then wrong and you get same problem.

sa 71
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Re: help with gk76a timing

Post by sa 71 » Thu Feb 28, 2013 2:01 pm

pretty sure left coil 1/4 right coil 2/3.

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Re: help with gk76a timing

Post by Marsbar » Thu Feb 28, 2013 3:20 pm

i know its silly but have you touched behind the clocks at all? i had a problem when i rebuilt my engine as that the wire from one of the coils goes beind the clocks and i got it mixed up. swapped it over and started

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Re: help with gk76a timing

Post by sa 71 » Thu Feb 28, 2013 3:56 pm

The only thing I've done behind the clocks is disconnect the headlight to save the battery whilst trying to start.thanks for the suggestions tho. I'd just like to rule out the timing as being the problem, anyone know timing spec for sure?

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Re: help with gk76a timing

Post by Marsbar » Thu Feb 28, 2013 6:09 pm

I used the Workshop manual for the bandit 400 when i rebuilt the engine, worked fine for me, i made a topic like this awhile back.

sa 71
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Re: help with gk76a timing

Post by sa 71 » Thu Feb 28, 2013 6:17 pm

I've been using the gsf 400 manual as I'm lead to believe its the same...?. Do you have a link to the manual you're using?

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Re: help with gk76a timing

Post by Variablevalves suck » Thu Feb 28, 2013 8:33 pm

Im not sure if the 76a uses the same settings as the B4 for cam setup.

You should send 'Gash' a PM as he recently got hold of a 76a manual.

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Re: help with gk76a timing

Post by donk » Thu Feb 28, 2013 10:22 pm

From the 76a jap manual

Image

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Re: help with gk76a timing

Post by sa 71 » Thu Feb 28, 2013 11:02 pm

That's great guys thanks for all the help. Now the only problem is that is how the timing is set . So the question now is what else would cause this?


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