Question about 1974 Yamaha DT 360

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Trouble Starting I'm having trouble starting my Yamaha Dt 360. There is a spark, gas flow seems to be fine, carburetor checked out, but i still can't get it to catch. Any suggestions? Thanks in advance!

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  • My reply is May 11, 2010

    Have you checked the timing?

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Hi,
This is an old 2 stroke, so chances are that the exhaust needs to be decarboned.
A good indicator would be that it got progressively more and more difficult to start with time.

Further, it would be a god idea to check the compression.

Also, you have not mentioned whether or not you have checked the auto lube system. This ensures that there is 2 stroke oil mixing with the fuel

Cheers

Jon

Posted on Mar 05, 2009

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1 Answer

My dt 125 is not starting


Hi, Anonymous and the usual suspects are:
1. Spark plugs in bad condition or have an improper gap or are partially fouled.
2. Spark plug cables in bad condition.
3. Battery nearly discharged, should have 12.5 volts.
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14. Valves sticking.
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Hi, Josh and the usual suspects are:
1. Enrichner system plugged, not properly functioning or improperly operated.
2. Fuel overflow.
3. Restricted fuel supply.
4. Gas cap and or fuel tank not venting properly.
5. Plugged slow jet or passages.
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Jun 02, 2012 | 2000 Yamaha V Star Classic

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Engine will not start


I am not real familiar with you bike but I may be able to help you trouble shoot it. Is the motor trying to turn over? If not it may be your starter. You should be able to tell by the sound. If its sounds normal starting up but wont turn on. You want to check and see if your spark plugs are good. Take them out and touch the threaded part of the spark plug to an unpainted piece of your bike. Now hit the start button and see if they spark. If they do not spark or have alot of carbon build up on them replace that and try again. If the new spark plugs do not work then its a wiring problem and let me know and I will talk you thru that. If its not the spark plugs then you want to check the gas flow. On the bottom of the gas tank there will be a shut off valve for the gas(petcock). Attached to the petcock there is a hose that comes off the bottom and runs to the carburetor. Turn the petcock off and detach the hose from the carburetor. Get a basin that you can temporarily put gas into. Put the hose in the basin and turn the gas back on. If you get good gas flow the petcock is good. Now if they are good this is where the fun begins. The carburetor is very touchy when it comes to any dirt or anything of that nature there are alot of small holes for the gas to go thru especially with the main and pilot jets. It may just be that the float is stuck. Your best bet in this case is just to get a phish(its like a parts schematic) and a bottle of carb cleaner and go to town cleaning all the ports and pieces. Make sure that when you take the carburetor off you put a clean paper towel in any open holes in the motor. You dont want any dust or dirt getting in there. If you have any questions feel free to email me at cstmundtgrndart@yahoo.com or shoot me a call or text at 1(717)802-2689 A.J. Weaver

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Hi, Randy and the usual suspects are:
1. Spark plugs in bad condition or have an improper gap or are partially fouled.
2. Spark plug cables in bad condition.
3. Battery nearly discharged, should have 12.5 volts.
4. Discharged battery, 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.
5. Throttle controls not adjusted correctly.
6. Water or dirt in the fuel system.
7. Water or dirt in the carburetor.
8. Intake air leak.
9. Fuel tank vent hose and vapor valve plugged, or fuel line closed off, restricting fuel flow.
10. Enricher valve inoperative.
11. Engine lubricant to heavy (winter operation).
12. Ignition is not functioning properly (possible sensor failure).
13. Faulty ignition coil.
14. Valves sticking.
For more information about your issue and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
http://www.starbikeforums.com/forums/49-v-star/2052-v-star-1100-hard-start.html
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1 Answer

Got spark but engine wont start


Thank you for the inquiry.
It's great that you got spark that means we don't have electrical issues to trouble shoot. If this bike has been stored for a while or not used over the winter we should probably start out with fresh gas. Gas left in the carburetor for long periods sometimes gets shellacked up and gums up the jets and float valve.
Some trouble shooting steps:
  1. Make sure the fuel shut off valve is in the on position. You can disconnect the fuel line at the carburetor and check for fuel flow. Might be some rust or corrosion at the bottom of the tank or in the valve obstructing the flow. If so then clean and clear.
  2. Tank vent tube at the top - check for obstructions and blow through to clear and confirm.
  3. First test: Turn the slide stop screw most of way out to get max suction.
  4. Lay bike on it's side until you see fuel overflow (Old Husquvarna starting trick)
  5. Slowly crank the engine through a couple of times with the choke on.
  6. Bring start lever up on the compression stroke then kick through real hard. Should pop.
  7. If won't pop or fire we will have to remove and open the carburetor and clean the pilot jet with a pipe cleaner and blow through it, clean and check the main jet, make sure the float valve is opening and allowing fuel into the bowl. Re-attache fuel line and open fuel shut off to confirm flow is coming through the float valve.
  8. Re-assemble the carburetor and install. Note- Good idea to install new gaskets to ensure max suction and no air leaks.
  9. Repeat the start procedure from step 3.
  10. Once bike starts and warms up turn the choke off and run the slide stop screw back in until it idles properly.
If you have other questions just reply to the comment section and we can do some other trouble shooting or make recommendations.
Best regards,
TF

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1 Answer

Wont start up. seems electrical 1975 Yamaha dt 400 What should I check?


check for spark at the spark plug.. if no spark at the plug check the coil for spark where the plug wire plugs into the coil. that bike probably has points. check the points gap.

Dec 12, 2009 | 1974 Yamaha DT 360

1 Answer

I have a 1974 dt 250 same as an dt 360 the bike has sat in a barn about 4 yrs it will not start removed and cleaned the gas tank went thur the carb new plug used ignition coil compression about 50 to 75...


Compression is too low!

Replace the piston rings.

Also check continuity from engine to frame till high-tension coil...
Check if breaker points aren't dirty ( clean out with fine sandpaper )
Check breakerpoint settings

Oct 31, 2009 | 1974 Yamaha DT 360

1 Answer

I have a 1974 yamaha dt 36o. It kicks back and runs rough.


its not an electrical problem. the engine either misfires or backfires. you have to be careful since kickbacks can be painful when the stater lever hits your leg.i believe you have to retune your engine, since its an old bike.

Jul 19, 2009 | 1974 Yamaha DT 360

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