Question about Yamaha Motorcycles
RT 175 Yamaha 1986 I need wiring diagram and resistance specs. for source,pulser and ign. coils. I am trying to fix this problem for buddy of mine who is in another state. I do not have the bike in my hands.Bike has no spark. I have 30yrs exp.as a tech.so I understand the principals and know Yamaha cdi.I just would like to know if anyone knows if this bike is problematic
Hi, James and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead acid batteries.
3. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
4. Loose connection at ignition coil or plug between ignition sensor and module.
5. Spark plug cables in bad condition, shorting/leaking, spark plug cable connections loose check for spark leakage in the dark.
6. Faulty ignition coil or electronic control module.
7. Faulty CKP, CMP, or BAS sensor.
8. Faulty ignition switch.
9. Tilt sensor needs a reset.
10. Security alarm failing to disarm needs reset
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
How to fix No Spark Problem on Motorcycles and Dirt Bikes
How to diagnose no spark situation on motorcycle
OEM parts for Yamaha
Yamaha DT Wikipedia
Posted on Jun 12, 2017
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Posted on Jan 02, 2017
SOURCE: timeing a yamaha 175 enduro
Without the year of the bike I am hampered. Lets assume it is an older bike and has a set of ignition points and not a CDI model.
Pull the cover off the shifter side of the engine. Remove the spark plug then turn the flywheel so you can see the points. Oil on them? Dirt, or rust? Next check the main bearing. Do not rotate the flywheel but instead hold the flywheel firmly and lift it up and down, left and right. Was there any movement or was the flywheel rock solid?
I am willing to bet that the points were dirty and there was a lot of play in the crank bearings. If so, you will need new crank bearings and seals plus new points and condenser. The engine needs to tear down into about 75 parts in order to replace the bearings. The job requires some special tools to remove the flywheel and clutch, plus a crankcase separator the split the gearbox.
This is not a job for the beginner. I suggest you have the shop do the work and also that you spring for 3 more bearings and seals plus a fresh cylinder bore, new piston and rings and a new spark plug. You now have a brand new engine that should run well and last for many years. Please rate this solution. Thanks
Posted on Mar 18, 2009
SOURCE: wiring diagram for bike
You can go to your local dealer and they usally will copy it out of ther service manuel for you.When you say passing lights do you mean highway lights?
Posted on Mar 29, 2009
SOURCE: my keeway wont start
Check the fuses. Is the kill switch on or shorting out? Disconnect it and then check for spark. Sidestand/centerstand should be up, Got a good battery?
I am unfamiliar with your Keeway and just trying to help. Don't give me a bad rating if I miss the mark on this one. Thanks.
Posted on Apr 01, 2009
Check the kill switches including the side stand switch, with an Ohmmeter. Good battery? Good fuses" All wires clean and with a solid connection? Check the loom. Any abraded wires? Check the operation of the ignition switch with a volt ohmmeter. Is the bike in neutral and the neutral light is lit up? Get new stock spark plugs.
If still no spark, get CDI system and coils checked at the dealers shop.
Please rate this solution. Thanks burbee904!
Posted on Apr 05, 2009
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