Saturday, 6 March 2021

Yamaha motorcycle charging system operation testing fault finding - Technicians video

Monday, 1 March 2021

Testing Motorcycle CDI units and systems

Testing motorcycle CDI units 











Learn more about these from this excellent video 





Technicians Guide To Yamaha Motorcycle Electrical Systems

Technicians Guide To Yamaha Motorcycle Electrical Systems


Basic electrical and circuit information ( excellent watch ) well worth watching even if you are above the basics level.


More advanced electrical circuit operation testing and fault finding 



Sunday, 24 January 2021

Aprilia RS 125 How to test spark plug with multimeter to see if is it is good or bad

 Its a very easy but useful test to make sure your spark plug is ok , you may need to clean the electrode to ensure you get a good reading but all you then have to do is set meter to read ohms and measure from the spark plug cap end to the electrode tip , and then from end to body to make sure no leakage to earth.


Buy RS125 NGK spark plugs here i always use them


How to test spark plug with multimeter to see if is it is good or bad

Get set up turn meter to ohms reading on dial and clean the electrode as below 

How to test spark plug with multimeter to see if is it is good or bad

Test between end of spark plug where HT lead cap fits and the tip of electrode the reading is very low only 1.2 ohms 

How to test spark plug with multimeter to see if is it is good or bad

on a dirty part of electrode the reading goes wild and eventually read 188.9 ohms so very bad and to avoid this clean electrode tip 



How to test spark plug with multimeter to see if is it is good or bad


Next test from spark plug cap end to the body to make sure no earth leakage your meter should read OL which is a good reading as it signals no leakage to earth via the body.

How to test spark plug with multimeter to see if is it is good or bad

See video of this process below 


Wednesday, 16 December 2020

Aprilia RS 125 blog youtube video repair series playlist

Just stuck all of our Aprilia videos on a playlist see link below 

Aprilia RS 125 blog youtube video repair series playlist


Aprilia RS 125 technical repair service and maintenance guides , pre ride checks , mot help and advice. How to repair guides and much more

Click link below to visit playlist of Youtube 

Aprilia RS 125 engine and motorbike repairs - YouTube





Monday, 7 September 2020

i have an aprilia rs 125 2001 plate and starts and stops , i checked for a spark and i am only getting multiple sparks . what would be the problem ?

i have an aprilia rs 125 2001 plate and starts and stops , i checked for a spark and i am only getting multiple sparks . what would be the problem ?



Q)  

i have an Aprilia rs 125 2001 plate and starts and stops , i checked for a spark and i am only getting multiple sparks . what would be the problem


A)  

hi , its hard to help when i d not know full story , is it a new bike that is never started properly or is just started happening ?


if your sure its spark then try a new plug first obviously then test coil , cdi etc .

test coil on input side see if its getting 12v to it .

starting then stopping could be fuel , have you cleaned carb out and cleaned jets out


Spark/Compression/Fuel/Air/Timing

You need all the above to get the engine to run.

Remove the plug, reconnect it to the HT lead, hold it on the cylinder whilst turning the engine over and you should see a spark.

Whilst plug is out do a compression test.

Check fuel is fresh and getting to the carb.

Check air filter is clean.

Unlikely to be timing but rs125s have been known to snap there own woodruff keys

Prob spark problem - duff plug , cap, ht lead, coil - prob not CDI but never know , timing slipped with woodruff key .

Try the obvious first and reply with findings!