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YZF 750 R won't start


SHAAGAR
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Is there anybody out there who can help me i've tryed everything on the bike,here's the list.

There's a good spark on all plugs,

The ohms are correct at the coil pick up,

The exup is correctly adjusted,

The carb sensor is correctly adjusted,

The fuel pump and vac tap are working ok,

The carbs are clean and there is fuel getting to the float bowls,

I've fitted new ht leads.

I've also tried to check the cdi,i have 12 volts at the red/black wire going into the coils and when i turn the bike over it drops to 10 volts.Is this correct or should it drop to 6 as a friend has said it should go from 6 to 12 volts when the bike is turned over.

But the thing still won't start.the bike fires (or shall i say pops) on number 4 cyl (the down pipe is warm after trying to start the bike) but the others are cold when you touch them.

Can anybody tell me the correct coil and ht lead config,i know mine is correct but i just want to make sure.

If anybody has any ideas please let me know as it is driving me crazy

Thanks

Steve :angry::(:unsure:

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