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TOPIC: INTRODUCING BONNIE BELL YAMAHA DT 400

INTRODUCING BONNIE BELL YAMAHA DT 400 23 Feb 2019 16:47 #1

  • asco
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Today’s score was immediate gratification as I had been gone most of the day and was hoping to rest up. Searching CL in my immediate neighborhood was a bike listing with no photos. Always a concern. But it was 10 minutes away so what the heck. Buried in the garage for at least 10 years ( ran when parked ) was the 1975 1976 Yamaha DT 400. Motor is not locked up. Great feeling compression. No title. No key. No plans what to do with it. The oil tank lettering tells me perhaps 1975. No air box. No speedometer / tachometer. I know I have one correct gauge. Something about replacing the forks was mentioned. Kick stand mount broken. Spray wash, and put it away.
The bike will be for sale, after a long day of getting it to fire up. North Hollywood, CA 39 miles south of Gorman perhaps.

Lucky ASCO never in a million years would I have conceived this.

asco

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YAMA-LAND
818-521-2109
MINIBIKESERVICE@AOL.COM 1971 125cc AT1-C (DOROTHEA) 1971 175cc CT1-C (BRANDY) 1970 250cc DT1-C (MONICA) 1973 100cc Hodaka Combat Rat (ABBY NORMAL) 1975 DT400 (BONNIE BELL)
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INTRODUCING BONNIE BELL YAMAHA DT 400 24 Feb 2019 11:53 #2

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Just spent about 30 minutes putting clear silicone around the top perimeter of my new HF Ultra Sonic Carburetor Cleaner. This time tomorrow it will be ready for the new bike.

a

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YAMA-LAND
818-521-2109
MINIBIKESERVICE@AOL.COM 1971 125cc AT1-C (DOROTHEA) 1971 175cc CT1-C (BRANDY) 1970 250cc DT1-C (MONICA) 1973 100cc Hodaka Combat Rat (ABBY NORMAL) 1975 DT400 (BONNIE BELL)

INTRODUCING BONNIE BELL YAMAHA DT 400 24 Feb 2019 17:07 #3

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1. Carburetor completely apart.
2. We have good spark.
3. 12 volt headlight bulb - 6 volt bike.
4. Brake pedal return spring needed.
5. Tires hold air.
6. Disconnected key switch.
7. Fuel tank inside immaculate.
8. Lubricated petcock.
9. 2 stroke oil / spark plug hole.
10. New ( used ) seat hinge pin.
11. Need fuel filter.
12. Need foam clamp air filter.
13. No clue what forks, axle.

a
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YAMA-LAND
818-521-2109
MINIBIKESERVICE@AOL.COM 1971 125cc AT1-C (DOROTHEA) 1971 175cc CT1-C (BRANDY) 1970 250cc DT1-C (MONICA) 1973 100cc Hodaka Combat Rat (ABBY NORMAL) 1975 DT400 (BONNIE BELL)

INTRODUCING BONNIE BELL YAMAHA DT 400 24 Feb 2019 17:53 #4

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My 78 had a 12 volt headlight bulb when I got it. Legal but scary at night.
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No Good Story ever started with a Salad . . .

INTRODUCING BONNIE BELL YAMAHA DT 400 24 Feb 2019 18:14 #5

  • KennyV
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Nice score! And in the neighborhood!
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71 Z50 Minitrail
72 RT2
74 250A
78 XT500E
06 F650GS Dakar

INTRODUCING BONNIE BELL YAMAHA DT 400 25 Feb 2019 00:38 #6

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Nice to find one so near.

Re the 12v headlight bulb, I've read elsewhere on the forum that this is one way of avoiding bulbs blowing if no voltage regulator fitted. If your bike was one of the last without a regulator fitted as standard, then perhaps this is why a previous owner fitted the 12v bulb.

Or it could simply have been fitted in error!

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INTRODUCING BONNIE BELL YAMAHA DT 400 25 Feb 2019 14:14 #7

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Pull the mag cover and clean it all up before you destroy the pulser because of debris in the mag area gets pinched between the magnets and the pulser. anyhow looks like 100 hrs of labour to and 750 for parts to make into to a rider. Have fun
Doug

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INTRODUCING BONNIE BELL YAMAHA DT 400 25 Feb 2019 14:23 #8

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run103 wrote: Pull the mag cover and clean it all up before you destroy the pulser because of debris in the mag area gets pinched between the magnets and the pulser. anyhow looks like 100 hrs of labour to and 750 for parts to make into to a rider. Have fun
Doug


I have not inspected the mag. The bike has tons of compression. I physically can’t kick the bike from recent health issues.

The carburetor nozzle got damaged on the way back in and the float bowl gasket needs to also be replaced. Not putting tons of money or energy in this one.

Thank you for the suggestions. I will remove the stator cover and have a look inside.

It popped once. Then I stopped.

a

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YAMA-LAND
818-521-2109
MINIBIKESERVICE@AOL.COM 1971 125cc AT1-C (DOROTHEA) 1971 175cc CT1-C (BRANDY) 1970 250cc DT1-C (MONICA) 1973 100cc Hodaka Combat Rat (ABBY NORMAL) 1975 DT400 (BONNIE BELL)
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INTRODUCING BONNIE BELL YAMAHA DT 400 25 Feb 2019 14:57 #9

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My 2 cents worth is stop trying to start it without cleaning the mag area. You will need to remove the flywheel. It is worth the effort because my experience with the pulsers is if they are good they will keep working reliably. If you damage it it is real hard to find and expensive to find another one or switch to a different ignition system. I am working on my 16th restore of these 360's and 400's with this ignition and they all are running good if you keep the mag area clean.
Doug
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INTRODUCING BONNIE BELL YAMAHA DT 400 25 Feb 2019 15:44 #10

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run103 wrote: Pull the mag cover and clean it all up before you destroy the pulser because of debris in the mag area gets pinched between the magnets and the pulser. anyhow looks like 100 hrs of labour to and 750 for parts to make into to a rider. Have fun
Doug


I was not expecting this:

a
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YAMA-LAND
818-521-2109
MINIBIKESERVICE@AOL.COM 1971 125cc AT1-C (DOROTHEA) 1971 175cc CT1-C (BRANDY) 1970 250cc DT1-C (MONICA) 1973 100cc Hodaka Combat Rat (ABBY NORMAL) 1975 DT400 (BONNIE BELL)
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