Question about Yamaha Motorcycles

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Is this my CDI box? It's a 1971 Yamaha 250? This sits under the gas tank. Can't find any little black box?

Posted by Anonymous on

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  • Yamaha Master
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Already answered this for you,it is the voltage rectifier 1971 Yamaha RD250 RD 250 71 Voltage Rectifier

Posted on May 09, 2015

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Posted on Jan 02, 2017

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SOURCE: 83 yamaha tt600e no spark

The CDI unit on the 83 model (TT600) is located under the fuel tank and suffers from heat
exposure.The solution is to get specialist help to open up the sealed CDI unit and repair/
replace internal connections (which are readily available electronic components)
When you re-install it put some heat shielding material there to protect it and this
will be OK as repair will utilise stronger parts,I think.
Later models have the CDI unit moved to the head-stem area.

(this info from a Non-mechanic who remembers what was done to his TT in Australia, many years

Posted on Jun 12, 2009

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SOURCE: 85 yamaha virago xv1000 are the coils & cdi igntor box interchang


Posted on Jun 22, 2009

finish line
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SOURCE: does not run

if you do not have fire only three things control this stator coil cdi more than likley you have a bad cdi u can get the cdi off ebay cheapest

Posted on Jul 05, 2009

  • 10 Answers

SOURCE: my 1991 yamaha fzr 600 wont start

how long did you let it sit for with gas in the carbs, you may have clogged up your jets. after awile gas will break down and turn into varnish, if your bike trys to push the varnish through the system it will clog the jets. try to take off your seat then remove your plastic over the gas tank. remove the gas tank and you will see four bowls *silver ones right next to where the gas tank is on the carbs*. your bowls are in sets of two. there are drain screws on the bowls to remove the gas inside. remove the 16 screws holding the bowl onto the carb. *4 on each* inside you will see your floats and jets. carefully loosen the jets with a screw driver then finish unscrewing them by hand, they are brass and very soft. you should be able to hold up the jets to the light and see a small pin hole. if not get some carb cleaner and give them a squirt and blow them out. do not try to use anything to clean them out, they are very very sensitive and one knick will change the jet. after that i would spray some carb cleaner up the jet holes and try to clean them out also. if you have a compressor it would be wise to use that to blow out the gunk from the jet holes as well. after you run threw all 8 jets put them back together and see how it goes, if nothing you may have to check the jets again and if clogged again your carbs are gunked up and will need to be cleaned

Posted on Aug 12, 2009

  • 1 Answer

SOURCE: Yamaha 2001 ttr 250. Bogs above half speed, under load

I have the same problems with my 1999 TTR 250, were you able to find out anything?


Posted on Aug 07, 2010

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1 Answer

Does a 1971 250 even have a cdi box?

No CDI. Unless someone has changed the ignition system.
That early of machine should have points and condensor

Apr 22, 2015 | Motorcycles

1 Answer

Yamaha xs 250 wont start

Hi, Anonymous and the usual suspects are:
1. Fuel tank empty.
2. Fuel supply valve/petcock turned off.
3. Fouled spark plugs.
4. Engine flooded as a result of overuse of the enricher.
5. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
6. Fuel valve/petcock or filter clogged.
7. Fuel line to the carburetor or throttle body pinched or kinked.
8. Carburetor float stuck.
9. Fuel injectors clogged.
10. Severely discharged or damaged battery you need 12.5 volts or better and be able to pass a load test if necessary.
11. 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.
12. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and CDI box.
Spark plug cables in bad condition and shorting check for leakage in the dark, cable connections loose, or connected to the wrong cylinders.
13. Ignition timing incorrect due to a faulty MAP, CKP, O2, TPS, sensors.
14. Faulty neutral, clutch lever, or kickstand safety switch.
15. Faulty fuel pump or fuse or relay.
16. Faulty CDI box.
17. A stuck bent or burnt valve.
18. Tip over sensor needs a reset.
19. 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 a nice day. What to do When Your Motorcycle Won Start
Yamaha XS250 360 400 Twins 1975 1976 1977 1978 Service repai Download...
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Oct 14, 2012 | Yamaha Motorcycles

1 Answer

About cdi yamaha zeal fz250 1999 model?where can find it?

Hi, Anonymous for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere zero $ you can download another one. 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.
yamaha zeal 250 manual pdf 1 Docs Engine com
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Aug 16, 2012 | 1999 Yamaha FZX 250 Zeal

1 Answer

Can't Start 1981 Yamaha SR250

find a running sr 250 and swop his cdi unit with yours if the bike runs, fine. if not put his cdi back in and try again. if the good bike now starts it will indicate that your cdi is faulty. the cdi is located under the tank inside the frame. don't buy a second hand cdi unless you can test it on a working bike. they are very expensive and you don't want to buy a dud

Jun 09, 2012 | 1981 Yamaha Sr250 Sr 250 Exciter Y213 Air...

1 Answer

No spark

Remove tha gas tank and the seat.
Remove the CDI-box (capacitor discharge ignition box). Black in color, and held to the frame by 10-mm bolts
Replace this CDI box.
Replace the spark-plug.
Re-check for spark again.

Oct 24, 2009 | 1984 Honda VT 500 C Shadow

1 Answer

I have a 2002 yz 250, it wont start, i just found out that one of the green cables on the CDI box was torn. what can i do to fix this ?

if the wire is long enough then solder it.but if the wire is torn out of the cdi box then you need to buy a new one.

Aug 06, 2009 | 2003 Yamaha YZ 250

1 Answer

Wr25of yamaha spark plug location

The spark plug is in the center of the cylinder head you will have to remove the gas tank to get to it. When you change the plug put a little gas down the hole that should help it start after sitting for so long.

Jun 17, 2009 | 2003 Yamaha WR 250 F

1 Answer

Cdi box

it is mounted under the left side of the tank dont put it near the radiator your cdi unit will not last long coz of it's high temp.

Apr 02, 2009 | 2003 Yamaha YZ 250

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