Question about 1973 Yamaha DT 360

2 Answers

Weak spark 1973 yamaha rt1 i don't see a spark

Posted by on

  • brian sroka Jan 18, 2012

    i see spark with the spark plug boot off but it seems to be weak. it will not jump the plug the plug is gapped and ive tried a few different plugs condencer ,points, ignition coil are new


2 Answers

  • Level 1:

    An expert who has achieved level 1.


    An expert that hasĀ over 10 points.

  • Contributor
  • 1 Answer

My buddy has a rt1 360, same thing happened years ago. We pulled the flywheel and cleaned the rust off of it, and either cleaned the points or got new ones, and that solved the spark issue.

Posted on Feb 26, 2015

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.


    An expert who has written 20 answers of more than 400 characters.


    An expert who has answered 20 questions.

  • Expert
  • 52 Answers

Problem could be a few different things. Not sure on all the ignition parts on that bike, but could be a bad sparkplug cap, wire, coil or magneto. My recommendation would be to first take the spark plug cap off. Trim a bit off the wire and put the cap back on. Over time spark plug caps move quite a bit and wear out the wire inside cause a weak connection.


Posted on May 26, 2011

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

What is spark plug gap on a 1971 rt1 360 yamaha and oil to gas mixture

Hi, Brian NGK B8ES gapped at .028" oil gas ratio 32:1 sorry you can't find the first and best tool you ever bought for your Yamaha despair not for a mere $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
OEM parts for Yamaha
Clymer Repair Manual for Yamaha DT1 DT2 DT3 DT250 DT360 DT400 MX250 MX360
Yamaha RT1

Apr 08, 2016 | Yamaha Motorcycles

3 Answers

Tb7oss trimmer won't start

to be honest, it would probably be less expensive and far less time consuming to replace the entire trimmer with a new/used timmer. If you are willing to invest the time, replace the magneto, the spark line and be certain the spark plug is clean and properly gapped.

Oct 06, 2014 | Troy Bilt Tb70ss Gas Trimmer

1 Answer

ZX7R weak spark

low battery
bad spark plugs if using old ones to test spark , how did you?
are all spark plugs weak.?
use a spark tester , or new spare spark plug to do the tests
gapped to factory spec.

Sep 22, 2013 | Motorcycles

1 Answer

2003 r1 miss fire has 3 fault codes on clocks but don't no what they mean

Hi, Wesley and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition and leaking check for spark leakage in the dark.
3. Spark plug gap too close or too wide.
4. Faulty ignition coil or CDI box.
5. Battery nearly discharged.
6. 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.
7. Intermittent short circuit due to damaged wire insulation.
8. Intake air leak.
9. Water, dirt, or rust in the fuel system, fuel pump and/or filter.
10. Faulty fuel pressure regulator
12. Fuel tank vent system plugged.
13. Throttle body controls misadjusted.
14. Damaged throttle body or intake seals.
15. Loose, dirty, or corroded CDI box plug.
16. Faulty MAP, CKP, or O2 sensor.
17. Incorrect valve timing.
18. Weak or broken valve springs.
19. Damaged intake or exhaust valve.
20. Check for engine trouble codes.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
Yamaha Fault Codes motorcycle manuals
R1 Fault Codes
OEM parts for Yamaha

May 26, 2012 | Yamaha YZF-R1 Motorcycles

1 Answer

I have a 1973 Yamaha 360 Enduro VIN/RT1-134437. I'm going to sell it and wanted to see if there are any other specific letters for the model type (DT, etc)

Hi, Rustynortont the answer to this question is way above my pay grade and for this situation, I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry.
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.
What is the difference between Yamaha DT 360 and RT2 360
List of Yamaha motorcycles
DOWNLOAD NOW Yamaha DT250 DT360 DT 250 360 Service Repair Workshop Manual...
OEM parts for Yamaha

Aug 18, 2011 | 1973 Yamaha DT 360

2 Answers

Have a 1994 Yamaha Virago 750. Just running on rear cylinder. Good compression and fireing.

Have you checked the spark at the high tension lead or at the sparkplug of the front cylinder?
To make sure the plug is in working order take it out, attach it with a wire to the cylinder, connect the HT lead and see if the spark really reaches the gap. if it doesn't or it's weak then the plug is shorted replace it.

Jul 20, 2011 | Yamaha FZ 750 FT (U.S Motorcycles

1 Answer

My john deere lt133 riding lawn mower has been shutting down when it get's hot and now it won't start at all. i took a spark tester and I'm getting plenty of spark on everything but the plug. I...

Hi, what are you calling proper voltage? If its a gap tester it should jump at least 8mm. If its a peak voltage tester it should be at least 12,000 volts. If not the ignition module is faulty, which is very common on kohler engines. Hope this helps, regards Phil.

Jun 30, 2011 | Garden

1 Answer

The bike is starting only with small plug gap.If we set the gap to original it wont start? tell me the reason?

.....A weak battery comes to mind for starters. A carboned up spark plug is another; start with a new spark plug. If I recall correctly from 39 years ago, your bike has ignition points and condenser. Remove the points cover (on left end of the overhead cam), and check the points. Burned? Pitted? Get a new set of points and condenser but for now, just file the points a bit using an emery board or metal fingernail file. Set the points to .015 clearance at the high point on the cam lobe. If you have a timing light you could check the timing and adjust as needed by rotating the points base plate left or right. Bad points give resistance to the flow of electricity. When the points are closed, the condenser gets charged up. Less electricity going through the points means less of a charge going into the condenser. Now the points open up and the stored charge goes from condenser to coil. The coil then produces a spark. With a low charge in the condenser, the spark is weak and will not jump a wide gap. Set the plug gap to very little and the weak spark can jump the gap. The standard gap is .028. ....... I don't recall when Honda move the points to the flywheel but the images below may help if your bike is that style. Clean any rust on noted parts; magnets and pick up coils. Okay, now I have done my part. Now you gotta do yours; please rate my answer. Thanks! tombones49_177.giftombones49_178.gif

Jun 15, 2011 | 1972 Honda CB 100

1 Answer

Sprayed down lawnmower with water, now it won't start. I decided to "wash" the lawnmower last week and now it won't start. And the really weird part is the solenoid clicks every minute...

Engine will not run with no spark or a weak spark. Continuity test will only reveal that the winding is not open, not if you are producing a weak spark that will not jump the spark plug gap.

Mar 31, 2017 | Garden

1 Answer

Changed fuel pump. getting fuel to engine. but will not start.

Check for spark. Maybe a crankshaft position sensor is bad or a module.

Secondary Spark Test This spark tester looks just like a spark plug, attach the clip to ground and crank the engine to check for spark 91052p10.jpg
This spark tester has an adjustable air-gap for measuring spark strength and testing different voltage ignition systems 91052p11.jpg
Attach the clip to ground and crank the engine to check for spark 91052p12.jpg
This spark tester is the easiest to use just place it on a plug wire and the spark voltage is detected and the bulb on the top will flash with each pulse 91052p10.jpg
The best way to perform this procedure is to use a spark tester (available at most automotive parts stores). Three types of spark testers are commonly available. The Neon Bulb type is connected to the spark plug wire and flashes with each ignition pulse. The Air Gap type must be adjusted to the individual spark plug gap specified for the engine. The last type of spark plug tester looks like a spark plug with a grounding clip on the side, but there is no side electrode for the spark to jump to. The last two types of testers allows the user to not only detect the presence of spark, but also the intensity (orange/yellow is weak, blue is strong).
  1. Disconnect a spark plug wire at the spark plug end.
  2. Connect the plug wire to the spark tester and ground the tester to an appropriate location on the engine.
  3. Crank the engine and check for spark at the tester.
  4. If spark exists at the tester, the ignition system is functioning properly.
  5. If spark does not exist at the spark plug wire, perform diagnosis of the ignition system using individual component diagnosis procedures.
Ignition Coil Testing
  1. Remove suspect coil.
  2. Disable fuel pump by disconnecting inertia switch electrical connector.
  3. Reconnect the ignition coil electrical connector to the coil.
  4. Install spark tester 303-D307 (D81P-6666-A) or the equivalent.
  5. Crank engine while observing the tester.
  6. If a blue-white spark is not observed replace coil.
Removal & Installation To Remove:
  1. Remove the air cleaner outlet pipe if interfering.
  2. Disconnect the connector from the ignition coil. coilconn.gif

  3. Remove the bolt from the ignition coil. coilbolt.gif

  4. Remove the ignition coil on plug.
To Install:
  1. Install ignition coil on spark plug.
  2. Install ignition coil bolt. Tighten to 10 Nm (89 in. lbs.). coilbolt.gif

  3. Reconnect the ignition coil electrical connector. coilbolt.gif

  4. Install the air cleaner outlet pipe if removed earlier.
prev.gif next.gif

Oct 28, 2010 | 1999 Ford Crown Victoria

Not finding what you are looking for?
1973 Yamaha DT 360 Logo

684 people viewed this question

Ask a Question

Usually answered in minutes!

Top Yamaha Experts


Level 2 Expert

281 Answers

Steve Sweetleaf
Steve Sweetleaf

Level 3 Expert

1144 Answers


Level 3 Expert

2600 Answers

Are you a Yamaha Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides