Help spark plug is fire missing

[P1]

Hi i have Yamaha 55 1996 model on idel and with gas is like one plug is missing when i try to touch the hytation lead it gave me a good shock.It's like that spark is going out. So i have to change the coil? Or it's another problem.

Thank you for your help regards P1.

 

[rodbolt]

Re: Help spark plug is fire missing

ok, lets keep all this on 1 thread.
do a forum search on homade spark tester.
make one,test the spark and post the results.
if boyh high tension leads can produce an arc that can jump a 7\16ths gap then the ign system generating components are working.

 

[P1]

Re: Help spark plug is fire missing

Hi rodbolt you the only one that help people here.I have a spark tester but only show light spark is coming on 2 plugs but spark is loosen i think is coming out of the sparkplug end cap i think the rubber is broken.Beause when i try to push it it gave me a good shock.The motor start immidiatly.

Thank you very much for your help and i'm trying to find home made tester but i did not find link yet. Regards P1.

 

[rodbolt]

Re: Help spark plug is fire missing

first, geographicaly, where are you located.
second if the cap is leaking voltage replace it.
thirdly we gotts find out if the system can arc the proper gap.
7/16th of an inch here but I dont know the metric conversion.
then your going to need some test equipment.
and some patience as I dont think english is your primary language.
the timer base bushings liked to wear on that engine and then spark can get very erratic.
the trigger coil on the new ones, and only 1 is avalible, is wrong.
I fought 2 of them to a standstill in the past 3 years.
but I do have a known good CDI hanging on the rack.

 

[krisnowicki]

Re: Help spark plug is fire missing

7/16 of and inch is 1.09 centimeters or 10.9 mm

 

[rodbolt]

Re: Help spark plug is fire missing

thanks, to tired to go look at the converter chart.

 

[P1]

Re: Help spark plug is fire missing

Hi to all first of all sorry for my english but i'm from Malta thank very much for your help and sorry for my delay answer beause of busy work.I have orderd the plug end cap beause in Malta every thing need to be order otherwise the motor is strating at the frist key is work perfect.I have set the plug as the manual recomand 1.00mm.I found that the works more fine with the plug BR7HS-10 insted of B8HS-10 as manual say.

Thanks once again regards P1.