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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  • 46 Answers

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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How to adjust carb on 1973 dt 80 cc


Hi, Cori if you have changed your fuel delivery system, air filter size or flow rate, mufflers or exhaust system or a significant change in altitude your carburetors need re-tuning and if your fuel system (gas tank, filters, fuel valve and carburetor) is contaminated with ethanol sludge, varnish, rust, dirt, water etc. or your bike has been sitting for months or years without running these components must be "PROPERLY" cleaned and reassembled "CORRECTLY" before any adjustments can be made. Tuning your carburetor is fairly simple once you understand the basic principals. You engine is a simple airbox sucking air in and blowing it out, it is finely tuned at the factory for maximum performance once you upset that delicate balance by changing air filters, camshafts or exhaust systems your performance may go down the and the engine may run poorly, you need to compensate the air-fuel mixture in the carburetor in order for the engine to run smoothly and at peak performance. If you are running multi carburetors you need to sync them first and make sure your air cleaner element is clean and dry for paper elements or lightly oiled for foam and meshed elements and properly installed. Here is how and where you compensate trouble: "TIP" if your engine "BOGS" your not getting enough fuel.
1. Closed to 1/8 throttle is managed by the air screw and pilot/slow jet.
2. 1/8 to 1/4 throttle is managed by the air-screw, pilot/slow jet, and throttle slide.
3. 1/4 to 1/2 throttle is managed by the throttle slide and jet needle.
4. 1/2 to 3/4 throttle is managed by the jet needle, needle jet, main jet, and air jet.
5. 3/4 to wide open throttle is managed by the main jet and air jet.
6. Wide open throttle is managed by the main jet.
If you are running lean, spark plug electrode color is white, engine runs hot and feels like it is starving for fuel you need to go up on the jet size or move the c-clip down one notch. If you are running rich, spark plug color is black or dark gray, engine runs cool, and bogs down when accelerating you need to go down on jet size or move the c-clip up one notch. When your carburetor is properly tuned for maximum performance your spark plug electrode will be a light tan color like coffee with cream. If you prefer fuel economy over performance you can go down on main jet sizes until a satisfactory level of lower performance is acceptable versus MPH, your spark plug color will be whiter and your engine will run warmer. These tuning adjustments will only make improvements if your intake and exhaust system have no air leaks or sealing issues and the entire electrical system is in proper working order and you have no mechanical issues. For more information about your issue and valuable "FREE" downloads that you will need please click on the websites below. Good luck and have nice a day.
Carburetor Set up 101
1983 Yamaha DT80 Enduro Part 1 Rebuilding Cleaning Carburetor
Yamaha DT80MX Service Manual
OEM parts for Yamaha
YAMAHA DT50 DT80 MX MULTI LANGUAGE SHOP MANUAL 1981 1984 Download Manuals...
http://mybikemanuals.com/yamaha/yamaha-dt

Mar 13, 2013 | 1973 Yamaha DT 360

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.
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.
* Carbureted models.
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.
https://yamahaclub.com/forums/topic/26695-dt125r-wont-start
DT 125 Cut out now wont start
http://www.motogelnar.cz/manual/YAMAHA/DT125X_RE-05-Service_Manual.pdf
OEM parts for Yamaha
http://www.dt125.cz/download/Owners_Manual-DT125X_RE.pdf

Jul 30, 2012 | 2003 Yamaha DT 125 R

1 Answer

1995 Yamaha PW50 hard to start


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 damaged or nearly discharged, should have 12.5 volts.
4. 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. Faulty fuel pump.
9. Intake air leak.
10. Fuel tank vent hose and vapor valve plugged, or fuel line closed off, restricting fuel flow.
11. Enricher valve inoperative.
12. Engine lubricant to heavy (winter operation).
13. Ignition is not functioning properly (possible sensor failure).
14. Faulty ignition coil.
15. Valves sticking.
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.
Just Bought Yamaha PW50 And Now It Has Trouble Starting
PW 50 wont start
https://books.google.com/books?id=ozV8-Aer4N8C&pg=PA84&dq=pw50+manual&hl=en&ei=TCS2TcbdJ4PW0QG0z9jmDw&sa=X&oi=book_result&ct=result&resnum=1&ved=0CGUQ6AEwAA#v=onepage&q=pw50%20manual&f=false
OEM parts for Yamaha
http://www.yamaha-motor.com/assets/service/manuals/2009/LIT-11626-22-24_PW50_1574.pdf

May 20, 2012 | Yamaha PW 50 Motorcycles

1 Answer

I have an E reg xj600 that was running absolutely fine on a trip to work but on the home journey I had a few problems. First the bike didnt seem to want to start, and when it did it sounded like it wasnt...


Hi, Gun_barrel and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. 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.
3. Spark plugs in bad condition or partially fouled.
4. Spark plug cables in bad condition and leaking check for spark leakage in the dark
5. Spark plug gap too close or too wide.
6. Faulty ignition coil, module, and or sensor.
7. Loose, dirty, or corroded ignition module connector at crankcase.
8. Faulty CKP or CMP, MAP, ETS, ATS, TPS, O2 sensor.
9. Dirty air filter.
10. Intake air leak.
11. Water, dirt, or rust in the fuel system.
12. Carburetor damaged, contaminated, sticky float, plugged jets.
13. Multiple carburetors out of sync.
14. Fuel filter clogged.
15. Old or contaminated fuel.
16. Fuel tank vent system plugged or carb vent line closed off.
17. Gas cap diaphragm valve faulty.
18. Vacuum line from intake manifold to fuel valve is broken, cracked, pinched, or missing.
19. Carburetor controls misadjusted.
20. Incorrect valve timing.
21. Valve springs floating, weak, or broken.
22. Damaged intake or exhaust valve.
23. Incompatible performance parts.
24. Control module may be in "LIMP" mode
25. Check for engine trouble codes.
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.
cylinders 1 and 4 not firing idles cuts out with throttle
My xj 600 is having trouble starting
Yamaha FJ Owners Workshop Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-xj-owners-manuals

Mar 19, 2017 | 1988 Yamaha XJ 600

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

Jun 03, 2011 | 2005 Suzuki DRZ 110

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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