[BooDaa]

Hi Everyone. First off, thank you for all of the helpful posts and posters.

For what it may be worth, the ATV is JH3TE072XM....

The no spark, no fuel pump intermittent issue has gone on for several years. I've done the fuel relay jumper bypass probably a half dozen times. Occasionally this would cause the ATV to start and run normal for a few days after putting everything back together. Generally after leaving it sit overnight it would not start and it would end up sitting for weeks or months.

It ran perfectly a week ago and I spent several hours riding it over the weekend. Left it overnight last Sunday and it was a no start again on Monday. Took the front bumper/fender/rack etc off and checked the connectors on the CDI and barrel connectors nearby. All seemed fine. ATV started, ran perfectly. Left it like that for a couple days and started it several times over those days. Took the connectors off the CDI and inspected, found no corrosion, fraying or any other problems. Ran the tests on page 17-4 of the manual. All normal except coil a little high but temperature was around 8C so not entirely sure of effect. Pimary Coil 0.6, Pulse Gen 326, Ignition 12.7V, Neutral yes, After 87 no. Gave them a dab of dielectric grease and put it back together. Started and ran perfect.

Put the fender back on, started putting the front bumper back on, crossed a bolt so quit for the night. ATV started after each of these steps and checked for start before packing it in for the night. Started and ran perfect.

Next morning went back out to get at the crossed bolt and continue putting everything back together......

No spark, no fuel pump....

Could it be the coil? Could it be the CDI?

Thank you.

 

[Duck0fDeath]

Probably the CDI. Try smacking it the next time you have no spark and see if the spark returns at least briefly. I Don't think the coil would effect the fuel pump like the CDI will.

 

[shadetree]

my money says the c.d.i. is bad. you may as well buy an oem fuel cut-off relay while your at it, and a fuel pump, take this step BEFORE all of these parts are discontinued !. yesssss..you can buy after market fuel pumps from china..lol. you deff need a c.d.i. .

 

[shadetree]

and I see your atv is a Canada model ?, so....make sure you buy a c.d.i. for a 1989 trx350D foreman 4x4.

 

[BooDaa]

Yes it's a 91 from Canada. The CDI connector reads HA7 CI545 (I maybe 1). Google search comes back suggesting 30410-HA7-650 is that correct ? Currently it has a Shindengen CDI but I can't see a number on it.

Thank you both.

 

[shadetree]

number # 3 --> https://www.partzilla.com/catalog/honda/atv/1989/trx350d-a/wire-harness .

 

[BooDaa]

Thanks shadetree.

 

[BooDaa]

Ordered a CDI from partzilla. Went out to take fenders off etc and get ready for new part. No spark no fuel pump as to be expected. So while I was cleaning up the threads on the bolt I crossed I took the CDI in the house and let it warm up for 20 minutes or so. Plugged the CDI back in, got the fuel pump on first crank as normal but didn't start. Grabbed on old spark plug and connected it to the plug wire and got spark. Stuck the boot back on the spark plug in the engine and it started right up. Now not certain if CDI or coil. Tomorrow is another day, I'll see if starts or not... Even took it for a quick loop around the driveway.

 

[shadetree]

hmmm..even if it starts now ?, doesn't rule out a bad c.d.i. ?, you took it inside to warm up, this might have something to do with it ?, either way, you can't go wrong with a new c.d.i. !.

 

[shadetree]

and just so you know ?, the fan control unit has a lot to do with it not firing plug too !.

 

[BooDaa]

Hi shadetree, what I was trying to say without too many words was that I wished I'd ordered a coil also just in case. I've little doubt that the CDI is bad as the fuel pump came on after warming. I had drained the carb bowl before removing the CDI just to make sure it wasn't cutting in due to being pressurized and it didn't. I just wished I had tried starting it a little longer before swapping the plug then I'd be certain it isn't the coil.

Fan control worked weekend before last when I had the opportunity to use the running atv. Cut in and out occasionally during the rides.

Thank you for the help.

 

[shadetree]

Hi shadetree, what I was trying to say without too many words was that I wished I'd ordered a coil also just in case. I've little doubt that the CDI is bad as the fuel pump came on after warming. I had drained the carb bowl before removing the CDI just to make sure it wasn't cutting in due to being pressurized and it didn't. I just wished I had tried starting it a little longer before swapping the plug then I'd be certain it isn't the coil.

Fan control worked weekend before last when I had the opportunity to use the running atv. Cut in and out occasionally during the rides.

Thank you for the help.

yw . I am the type that tries to think long term here !. what I mean is, sooner or later, these c.d.i's won't be able to be gotten !. they will discontinue them soon I bet ?!. and its always a great idea to have a back up '' just in case '' !!..lol. I need to buy me a c.d.i. for my 1989 trx350D foreman 4x4 soon, so i'll have a back up before honda discontinues them ?!. coils on the other hand ?, these are a dime a dozen , as most newer atvs still use them today. shoot, I remember many moons ago, I was working on an old atc200es, the spark plug coil wire that went to the spark plug and boot ?, it died, sooo..what to do ?..hmmm..ok..i had an extra set of spark plug wires and boots left over from my old truck wayyyyyyyyyy back, would it work I thought ?. SURE ENOUGH !!. matter of fact..i got a much bigger and brighter spark !..lol.

 

[shadetree]

oh, and you might want to look inside the spark plug boot ?!. some of these boots have a resister fuse in them ?..if they do ?, it could be going bad ?, or died all the way ?. pull the spark plug out of the boot, look down inside the boot, if you see what looks like a slot for a standard screw driver ?, unscrew it, dumb it out, you will see this resister I speak of .

 

[BooDaa]

All right. I didn't fool around today! Went out, didn't start, no fuel pump, didn't touch the spark plug boot so assuming no spark. Pulled the CDI off and took it in the house for a warm up. Went back out, put the CDI back and it started right up. Clearly the CDI is the issue.

After all the above I took a look at the spark plug boot ad I do believe it is a resistor boot.

Awaiting new CDI.

Thanks again.

 

[shadetree]

All right. I didn't fool around today! Went out, didn't start, no fuel pump, didn't touch the spark plug boot so assuming no spark. Pulled the CDI off and took it in the house for a warm up. Went back out, put the CDI back and it started right up. Clearly the CDI is the issue.

After all the above I took a look at the spark plug boot ad I do believe it is a resistor boot.

Awaiting new CDI.

Thanks again.

yep, that has a resister down under that screw !.

 

[BooDaa]

New CDI installed and left in unheated location over night. Started right up and ran perfectly all day.

Thank you again for the help with this!

 

[shadetree]

New CDI installed and left in unheated location over night. Started right up and ran perfectly all day.

Thank you again for the help with this!

yvw . glad to help !!. thanks for the update !.