1987 Honda 350d trouble - Honda ATV Forum
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post #1 of 37 (permalink) Old 06-30-2019, 04:09 PM Thread Starter
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1987 Honda 350d trouble

I have a 1987 Honda 350d that having some issues. It runs intermittently. When I turn the the key on i get the correct lights and if I hear the fuel pump then it gets spark and starts right up. If I turn they ignition key i get the correct lights but donít hear the fuel pump then it wonít start and there is no spark. If I take either wire off the ignition coil then the fuel pump will turn on. Any ideas? I have been playing around with it for the last 3 days and canít figure it out!
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post #2 of 37 (permalink) Old 06-30-2019, 08:13 PM
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Has it run well for you in the past?

At this point i can only guess at CDI, unless you have an older battery.

Do you have a service manual?

Get some contact cleaner and permatex dielectric grease. Clean and lube the CDI connectors.
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post #3 of 37 (permalink) Old 06-30-2019, 09:43 PM
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Check the stator and pulse generator connectors (located under the seat near the airbox, right side) for corrosion. Clean and dielectric grease them before you snap them back together. Then check the fuel-cut relay connectors (inside the box with the tin cover, located near the regulator/rectifier in the right-rear wheelwell) in the same manner.

The fuel-cut relay controls the fuel pump by sensing RPMs. It does not allow the fuel pump to run unless the motor is being cranked over (or running) with the ignition and kill switch both on for safety reasons. So those connectors and wiring harness' must be in good working condition. Check the fuses and fuse box as well. If it still acts up, unplug all of the ignition switch bullet connectors and clean & grease those as well.


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post #4 of 37 (permalink) Old 06-30-2019, 09:47 PM
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The battery must be maintained in good condition too. If its old or weak replace it.


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post #5 of 37 (permalink) Old 07-01-2019, 03:38 PM Thread Starter
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I have inspected all of the electrical connections and they look perfect. I also put stabilant 22 electrical enhancer on all the connections Before I reconnected them. The battery is a year old and seems to be fine. It cranks the bike over with no problem. The fuel pump is aftermarket and I have a new one on order. I didnít know if it could be shorting out causing the issues since it is tied into the ignition system. Thanks for any suggestions
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post #6 of 37 (permalink) Old 07-01-2019, 10:26 PM
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Quote:
Originally Posted by Rstiles11 View Post
The fuel pump is aftermarket and I have a new one on order.
China knockoffs don't work on Hondas. Ya gotta put OEM Honda parts on your ATV to solve a problem.

But if you aren't getting any spark thats an entirely separate issue from the intermittent pump. Is that the case?


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post #7 of 37 (permalink) Old 07-02-2019, 03:14 AM Thread Starter
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Sometimes it gets spark and starts up with no problem and sometimes it wonít get spark. Very finicky thatís why Iím having so much trouble with diagnosis.
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post #8 of 37 (permalink) Old 07-02-2019, 09:36 AM
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Start with verifying the fuel-cut relay functions 100% of the time as mentioned above. Do you have a copy of the service manual? Diag steps for the relay are covered in there. After that its all ignition diagnosis and most of that is easy if you have a multimeter. According to your explanation of symptoms there is no reason to suspect the CDI yet. Keep us posted if you can.


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post #9 of 37 (permalink) Old 07-02-2019, 10:26 AM Thread Starter
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I ordered new Oem fuel cut relay
The only other parts that arenít oem on bike are ignition switch and coil and fuel pump. The ignition switch should only have 4 wires. Anybody know oem part numbers for these?
I do have a copy of service manual.
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post #10 of 37 (permalink) Old 07-02-2019, 11:12 AM
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You'll have to replace all of those other china parts with OEM Honda parts before you'll get it fixed. There is no sense in working on it anymore until you do. We can't help ya get china parts working cause we know from years of experience that china parts are non-functional garbage. Sorry for the rant, I just can't stress that point enough. Your bike won't ever run with those parts on there. In fact other expensive parts can/will get fried with those china parts plugged in!

Now lets get going on solving those china problems... you can look up part numbers here:

https://www.partzilla.com/catalog/ho...ax-foreman-4x4

But first make darn sure that your bike is a 1987 TRX350D and not a TRX350. The year and model must be correct because the 87 350D is a one-of-kind machine. Ignition & electrical parts from other years and models do not interchange with the 87 350D.

The coil for an 87 350D is #5 on the parts fiche:

https://www.partzilla.com/catalog/ho...4/wire-harness

Fuel pump is #5 here:

https://www.partzilla.com/catalog/ho...-4x4/fuel-tank

The ignition switch is #4 here:

https://www.partzilla.com/catalog/ho...-4x4/handlebar

That Ign switch is discontinued so you'll have to scrounge for either an NOS Honda switch or a used one. Remember, aftermarket do not work, OEM Honda only. AND the OEM switch that you buy MUST match the part number exactly. Other year/model switches do not fit that bike. And most folks don't know that.

Right now you are at a very high risk for frying other components (CDI is next likely candidate to burn if it hasn't already!) on the bike due to those china parts being on there. Disconnect the battery cables immediately and don't connect them back up until every china part has been replaced with OEM parts having the correct part numbers for your year/model.

If there are any wiring harness cobbles or splices then thats suspect too. So look those harnesses over carefully. Replace if someone has "worked" on any of them.

Keep us posted... I imagine the only thing wrong with your bike is someone put china parts on it.


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