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RT 175 Yamaha 1986 NO SPARK

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 a I understand the principals and know Yamaha cdi.I just would like to know if anyone knows if this bike is problematic

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  • Yamaha Master
  • 46,501 Answers

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

  • 3567 Answers

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

  • 112 Answers

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

  • 3567 Answers

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

  • 3567 Answers

SOURCE: no spark on my bike haven't road for a year now help please

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

  • 5 Answers

SOURCE: ktm 450sxf 07 wont start

buy a yamaha

Posted on Sep 25, 2009

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1 Answer

Hi I have a Suzuki DT 16 engine 1602 no 207668 I have no spark at the plugs I have put a volt test on the green going into the CDI unit about 3 to 4 volts when pulled what should it be Thanks Mike

With or without remote control??
Disconnect the black/red wire from the CDI, if you have sparks, kill circuit shorted.
No spark: check coils
1 . The two pulser coils are located at 1 80°angles to each other and the
condenser and battery charge coils are also located opposite of each other
under the flywheel.
2. Remove the engine cover.
3. On models equipped with electric starters, disconnect the negative
battery cable.
4. Disconnect the connector and black ground wire.
5. On the No. 1 pulser coil, connect the digital multi meter between the
black/red wire terminal in the connector and the black ground wire. And the
No.2 coil between the white/green wire terminal in the connector and the
black ground wire. Resistance should be 260-380 ohms.
6. On the condenser charge coil, measure the resistance between the
black/red and green wires. Resistance should be between 1 70-250 ohms.
7. If the resistance reading is not within specification, replace the faulty
8. On the battery charge coil, measure the resistance between the
yellow/red and yellow wires, red and yellow wires (DT1 5MC) or the red and
yellow wires (DT15CE). Resistance should measure between 0.2 and 0.5
9. If the resistance reading is not within specification, replace the faulty

Jul 26, 2017 | Clymer Suzuki 2-225 HP Outboards Includes...

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Front cylinder has no spark xv250 1999

Try a new plug, If not, the pulser coil in the LH motor cover is the first to check. take a resistance test of the pulser where the wires come out of the motor (Unplugged). Forget the 3 white, they are only for charging, The other 4 are the pulsers, 2 for each. I don't have the color codes, But they should both have the same resistance reading, 100~330 ohms. If one pair is wayoff from the other, That coil is bad. Ignition coils under the tank & black boxes, VERY SELDOM go bad.

Jan 20, 2014 | Motorcycles

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1977 dt 175 e and i can't get it to fire i put a new coil and still no spark

My old 73 175 had points, I don't know if yours does. There is also the stator/ magneto. Try disconnecting the kill switch or unplug the key cylinder. There is a more detailed check in the manual. I can't find my old 175 manual but ttr125 says 1) check plug for spark- clean or replace. 2) check entire ignition system for connection. 3) check ignition stop switch. 4) check coil. a- primary coil, b- secondary coil. 5)check cdi coil. a-pickup coil. b- charging coil. Since you have replaced the coil I will only give specs for the cdi check. The picture shows a plug under the tank disconnected. It has four wires brn grn red and wht. To check pick up coil resistance set ohm meter to x 100. attach the plus lead to red and neg. lead to white. It seems to have a short wire in each jaw of the alligator clips of ohmmeter that is pushed into the disconnected plug that contacts appropriate wire color. Reading should be 248 to 372 ohm at 20 degrees C (68 degrees F). Charge coil test places the plus lead of ohmmeter to the brown wire and neg. lead to the green wire of the open plug. Meter at x 100. Reading should be 688 to 1032 ohm at 20degrees C. Of course while doing step 2 check for good grounds and tight connection at plug cap and use a new plug. Good luck.

Apr 06, 2011 | Yamaha DT 360 Motorcycles

2 Answers

It not geting any spark new coils also

I would test the plug wires and plugs first to make sure the fire from the coils is actually reaching the plugs. Then check the ignition switch to make sure your getting a complete circuit. IF this si not the problem, have your stator checked. It is the piece that goes around the crankshaft, and produces electricity for the bikes systems. If you need additional insight, provide additional information, and I will try to help you further. Thank you for calling on

Apr 13, 2010 | 1982 Yamaha XJ 650

2 Answers

Hi i have a 1997 yamaha 350 warrior i have no spark to the spark plug what could be

hello, you probably need to have your stator checked out, sometimes the pickup coil in the stator will go out, also you can try ign coil, the one spark plug wire is hooked to,warriors are bad about cdi going out, mine would idle, would not rev up, would bog down, source coil in stator probably needs to be checked also..

Feb 27, 2010 | 1974 Yamaha DT 360

2 Answers

No spark at plug

follow the lead to the coil and see iff the wires have comeon had the same problem the other day

Dec 10, 2009 | 1988 Honda CBR 600 F(1)J

1 Answer

Cant get a spark from yamaha kodiak 400,battery good but no spark when cranking over the engine, had coil tested and ok, any ideas what the prob could be

I did one about a year ago & it was the pulser coil(black plastic pickup next to magneto behind L/H engine cover) but
  1. I'm not suggesting that this is definatly the fault
  2. But id check it first
  3. I havent got the spec for it but got it from my Yamaha dealer easy enough(you'll need the wire colours as well)
  4. contact me back if you can't get them and i'll see what I can do(it'll be another week before I can get it as my phone is shot! blew the line clean out of the wall in a storm a couple of weeks ago)
Hope this helps
Andrew porrelli

Dec 07, 2009 | 2008 Yamaha YZF-R125

2 Answers

I am not getting spark on my 1997 suzuki bandit 1200s, there is a weak spark for a second then it stops and nothing, it will crank over fine, im almost positive its not my coil packs as i had a known good...

Hi and welcome to FixYa,

Just to verify and eliminate the ignition coils, tests for it are:
  • one terminal would have an IGN +12;
  • the other terminal would have a pulsating voltage when cranking;
  • passive test, primary (+ to -), resistance 3 ~ 5 ohms; while
  • any of the primary terminal to HT would be 15 ~ 18 kilo ohms.
The CDI could not be tested since it is a sealed unit. The only way to confirm if it is a CDI is to check the external factors and if they are present yet no spark, then it would be the CDI:
  • the CDI gets its triggers from the pulser coils;
  • the output of the pulser coils would be very very low ACV;
  • it would be preferable to use an analog/needle type multitester for the flickering pulser voltage;
  • the CDI also needs a "go signal" from the interlocks together with the starter relay;
  • try exercising the sidestand when cranking;
  • verify neutral light is on;
  • try starting with the clutch lever pulled.
Another possibility to consider is that the starter is consuming most of the power from the battery leaving very little for the ignition system to use and/or the ignition switch has some loose connection. The IGN +12 to the coil terminal should also test this possibility.

Please postback results / updates of tests performed.

Good luck and thank you for using FixYa.

Apr 28, 2009 | 1997 Suzuki GSF 1200 Bandit S

1 Answer

Gsxr 750 no spark how do i test cdi

I've this data from my 1986 engine!

Under the left hand side cover there are 2 2-wire connections. One with a green and a black wire, one with a blue and a yellow wire.
Use an ohmmeter at R x 100 between both wires of a connector to check the pick-up coils: resistance must be between 130 and 180 Ohms.

The values of the ignition coil resistances are:
primary coil : 3-5ohms ( set ohmmeter at R x 1 )
Secundary coil : 25.000 - 45.000 ohms ( set ohmmeter at R x 1.000 )
For a correct measurement ALL leads must be disconnected ( also the spark plug leads )

The CDI cannot be tested with a simple measurement. Suzuki dealers have a special tool to test CDI boxes.
But checking the pick-up coils and ignition coils good will indicate an defective CDI.

The wires on the CDI:
Blue: PU coil 1 ( cyl 1-4 )
Yellow: PU coil 1
Green: PU coil 2 ( cyl 2-3 )
Blue : PU coil 2
Orange/white : +12v ign coil 1-4
White : switched coil negative side ign coil 1-4
Orange/white : +12v ign coil 2-3
Blue/yellow: switched coil negative side ign coil 1-4 ( and signal to tachometer )
Blue/white : ground

Thus, you must have +12V on both Orange/white leads.

Mar 15, 2009 | 1992 Suzuki GSX-R 750 WN

1 Answer


try replacing spark plug 1st set at proper gap. next take plug cap off wire by unscrewing it from wire. hold 1/4" from motor and crank. if none, trim 1/8" off wire and retry. your pulser coil could be out. get multimeter, get service manual, find resistance reading,unplug stator/pulser coil plug(S) follow manual test procedure for testing stator coil, and pulser. check ign coil,make sure grounded to frame,clean rust, check resistance readings(manual) or test system w/ known good unit. lastly check wiring for continuity if no fire.

Feb 19, 2009 | 2001 kawasaki KMX 125

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