[87 TRX350D] Starting Issues - Honda ATV Forum
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post #1 of 99 (permalink) Old 05-26-2019, 06:57 PM Thread Starter
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[87 TRX350D] Starting Issues

In brief, my ATV is doing exactly what is seen in the following video. It has a Carb that was built by @shadetree, so we know that's good. Next up is CDI replacement and ignition coil swap.

https://m.youtube.com/watchv=dTbmw8uNx7o

Ideas?

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post #2 of 99 (permalink) Old 05-26-2019, 07:52 PM
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Link to video isn't working....

'87 TRX350D
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post #3 of 99 (permalink) Old 05-26-2019, 08:51 PM
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Before you replace the CDI, ohms check the pulse generator and the stator. The diagnostics section may also run you through a voltage test to the CDI.

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post #4 of 99 (permalink) Old 05-26-2019, 09:01 PM Thread Starter
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https://m.youtube.com/watch?v=dTbmw8uNx7o
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1987 Honda TRX350D Red Foreman #1 - Restored
1987 Honda TRX350D Blue Foreman #2 - Restoration In-Progress
1986 Honda TRX350 ForeTrax #1 - Restoration Done - Sold
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post #5 of 99 (permalink) Old 05-26-2019, 09:01 PM Thread Starter
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Quote:
Originally Posted by Duck0fDeath View Post
Link to video isn't working....
Link posted above.

1987 Honda TRX350D Red Foreman #1 - Restored
1987 Honda TRX350D Blue Foreman #2 - Restoration In-Progress
1986 Honda TRX350 ForeTrax #1 - Restoration Done - Sold
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post #6 of 99 (permalink) Old 05-26-2019, 09:31 PM
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Have you changed the starter valve on the carb? If it’s hard starting and you didn’t change it that’s my bet.

If you think fuel starvation
do a flow test on the fuel pump.
inspect the petcock by taking it off and blow through it when on and reserve make sure the gasket didn’t slip and block the flow
Replace cracked hoses might be causing the pump to lose the prime

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post #7 of 99 (permalink) Old 05-26-2019, 09:38 PM
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Try using the choke lever to start. It's right below the start/run/light switch.

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post #8 of 99 (permalink) Old 05-27-2019, 08:30 AM Thread Starter
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Quote:
Originally Posted by Goober View Post
Have you changed the starter valve on the carb? If it’s hard starting and you didn’t change it that’s my bet.

If you think fuel starvation
do a flow test on the fuel pump.
inspect the petcock by taking it off and blow through it when on and reserve make sure the gasket didn’t slip and block the flow
Replace cracked hoses might be causing the pump to lose the prime
Can you clarify what you mean by the "starter valve"?

The fuel filter is new, I might need to replace some hosing. Didn't pull the petcock yet, but when you say the gasket may have slipped, is that inside the actual unit and you're thinking it may have caused it to go from On to partially Off?

Quote:
Originally Posted by Duck0fDeath View Post
Try using the choke lever to start. It's right below the start/run/light switch.
LOL well of course! That video isn't mine, just has the same symptoms as my machine.

No one is thinking CDI and/or Coil eh?

1987 Honda TRX350D Red Foreman #1 - Restored
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post #9 of 99 (permalink) Old 05-27-2019, 09:41 AM
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The starter valve is part of the choke assembly and screws into the carburetor. #9 in the link:
https://www.partzilla.com/catalog/ho...4x4/carburetor
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post #10 of 99 (permalink) Old 05-27-2019, 09:42 AM
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Hard to diagnose your problem by viewing another man’s vidya but I’d say number one he’s not using the correct starting method and two his choke valve is worn. Which would explain your fouled plug. The choke or starter valve is on the side of the carb.

To start a carburetted engine this is how Shadetree explained to me awhile back:
Cold engine
Run switch to ON
Set choke to far left (there is a full detent stop, a half choke detent stop and off)
Key Ignition to ON
Neutral light on steady
Oil light on momentarily then off
Hold throttle 1/3 open
Crank or kick over engine
After it cranks or kicks you may hear the pump run (short but rapid drrrrrrrr); if it runs longer than say three seconds you might have air in lines or failing pump. That’s why i said do the volume test.

After it runs for a minute maybe two then switch to half choke; after 3-5 minutes ready for choke off.

You'll hear the pump cycling and maybe see it chug-chug ever couple seconds

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Last edited by Goober; 05-27-2019 at 09:46 AM.
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