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post #1 of 13 (permalink) Old 08-05-2019, 05:40 AM Thread Starter
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New member with troublesome TRX350d

Hi All,

Thanks for the forum and I hope all is well.

Iím based in North Yorkís England and love my Honda quad. Weíre farmers but wenwork as well as it doesnít pay the bills.

Iím hoping to find a better service manual as I can only get a Haynes manual for other models, and my quad is playing up. A 15 amp fuse blew and the starter motor wonít work but after kick starting it, it now cuts out after a couple of hundred yards.

Iíve changed the oil which was low, the fuel and air filter and am about to change the pump. Any ideas folks?

Thanks

Matty
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post #2 of 13 (permalink) Old 08-05-2019, 06:47 AM
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First, welcome
These are great quads but they run best and most reliably on OEM parts.
So if you’re gonna buy a fuel pump make it OEM least you’re gonna pay is $130. Worth it

See the links in my signature block? You can access the online manuals here and download them. Or buy this copy off fleabay!

If your quad is cutting out, fist check the plug for fouling. If so, soak the tip in Berryman Chemtool and brush off with brass brush.

Then check the starter/choke valve—it sounds worn so you choke isn’t shutting off. Here’s a pic. The conical gasket should be pliable and fit snugly in the bore
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post #3 of 13 (permalink) Old 08-05-2019, 08:45 AM Thread Starter
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Thanks- I will download the manual and do as recommended

Thanks, I have now purchased that book, as well as one called a shop manual in green for it off eBay.

May be needless but itís cheap and good fun.

I have changed the spark plug as well and there was no difference to the bike. Iíll try and find the choke inlet as youve suggested this weekend).

(I canít work out why what seems a fuel problem occurred at the same time as it cutting out after a few hundred yards, unless there are electrics within the choke inlet).

Thanks again,

Matty
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post #4 of 13 (permalink) Old 08-05-2019, 12:46 PM
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You can do a fuel pump flow test

You might just have a piece of trash in the carb bowl–when it starts to pull then maybe it sucks it up into the main jet–however it might also suck it into the idle jet, so unless it quits randomly i think not.

Or maybe the tank fuel lines have sediment in them that restricts flow. I had to use about a foot of old brake cable to clear blockages in those lines–take off the petcock and you’ll see them.

Otherwise the petcock gasket could have slipped and restricts fuel flow

Lots of things can cause this, so I always start by cleaning the tank. There’s a drain bolt underneath the tank plate

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https://www.partzilla.com/catalog/honda
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post #5 of 13 (permalink) Old 08-07-2019, 05:38 AM Thread Starter
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Hi there, I fitted a new pump last night and the symptons are the same. The old one when running sounded like it was knocking every couple of seconds, and the new pump (not OEM) seems to click every second or so like a dodgby relay. It started on the kick start, ran for 200 yards, then stopped and wouldn't start again until I left it 15m. The 200 yard distance seems consistent each time. I ran it very hard and it revs up well until it dies.

The oil temp light comes on when you drop the revs, but turns off when you raise the revs, and it seems to run for ages in the barn on tick over.

I made a mistake of running it off reserve so it could be bad/old fuel. I will drain the tank this weekend, and thanks for the advice on the carb. I'll try and find the tank drain bolt as you've said. I've ordered some new fuel lines as they are a cheap repair to try. I've never looked at a carb before to see the bowl but I'll google it. It should be easy to access to check for dirt, and I'll check the choke as well. It's warm here and you only need choke to start it, and then you can very quickly release the choke. The old fuel filter was very dirty (now replaced) and (I think) only cleaned the main tank not the reserve, as there are 2 fuel lines going into the pump (clearly I'm clueless!).

Is the petcock simply bolted on to the tank?

I still canít figure out why this issue would occur at exactly the same time as the starter failing. It was low on oil- could it be the fan didnít come on as the old unit failed, and tells the engine to stop? I guess itís just a coincidence.

Thanks again,

Matty
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post #6 of 13 (permalink) Old 08-07-2019, 08:16 AM
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bad fan unit ?, it also controls the c.d.i. in case an over heat of engine. this part is discontinued today, sucks..i know !. as for fuel pump ?, even a brand new fuel pump will not work at 100% IF THE FUEL CUT-OFF RELAY IS GOING OUT ?!. its located at right rear wheel, up and behind the tire, inside the black metal box. its black with a red connector on it. also..the fuel pump and relay works off the rpms of the crank, sooooooo..if the engine is not running correctly ?, the pump and relay wont work right. which tells me, the c.d.i. can be going out ?.

'89 trx350D foreman 4x4...'85 vf700c magna, '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho, '08 vt750c2 shadow spirit
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post #7 of 13 (permalink) Old 08-07-2019, 07:47 PM
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Quote:
Originally Posted by TRX350d1989 View Post
Hi there, I fitted a new pump last night and the symptons are the same. The old one when running sounded like it was knocking every couple of seconds, and the new pump (not OEM) seems to click every second or so like a dodgby relay. It started on the kick start, ran for 200 yards, then stopped and wouldn't start again until I left it 15m. The 200 yard distance seems consistent each time. I ran it very hard and it revs up well until it dies.

The oil temp light comes on when you drop the revs, but turns off when you raise the revs, and it seems to run for ages in the barn on tick over.

I made a mistake of running it off reserve so it could be bad/old fuel. I will drain the tank this weekend, and thanks for the advice on the carb. I'll try and find the tank drain bolt as you've said. I've ordered some new fuel lines as they are a cheap repair to try. I've never looked at a carb before to see the bowl but I'll google it. It should be easy to access to check for dirt, and I'll check the choke as well. It's warm here and you only need choke to start it, and then you can very quickly release the choke. The old fuel filter was very dirty (now replaced) and (I think) only cleaned the main tank not the reserve, as there are 2 fuel lines going into the pump (clearly I'm clueless!).

Is the petcock simply bolted on to the tank?

I still can’t figure out why this issue would occur at exactly the same time as the starter failing. It was low on oil- could it be the fan didn’t come on as the old unit failed, and tells the engine to stop? I guess it’s just a coincidence.

Thanks again,

Matty
Yes the petcock bolts on to the tank–you’ll see the two intake tubes. The left is the reserve–you can cut the end off an old brake cable and use it to break a rust or dirt blockage. I attached mine to s drill and used it as a directional bore LOL. CAREFUL there are fine screens at the end of the tubes–you don’t want to pierce them with the cable.

Ok one thing at a time I suppose. Do you have an old battery in it? Is your oil really dirty? Trying to think why your oil like would cycle like that.

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https://drive.google.com/drive/mobil...13&direction=a

https://www.rockymountainatvmc.com/oem-parts

https://www.partzilla.com/catalog/honda
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post #8 of 13 (permalink) Old 08-11-2019, 03:29 AM Thread Starter
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Hi, Iíve carried on as as advised, and Iíve drained the tank, checked all the fuel pipes, and all seem ok. Iíve moved on to trying to see why the starter has stopped at the same time. Iíve changed the starter relay which clicks after a few minutes of being turned on, and wasnít before at all, but the ignition neutral light and oil temp work perfectly.

When I check the battery voltage is 12.5v, but the leads off the starter relay only give 3.7v?. When the relay clicks I get a 0.14v from the starter motor leads on the starter case. Duff battery? The neutral light goes off when I turn the headlights on.
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post #9 of 13 (permalink) Old 08-11-2019, 03:39 AM
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Quote:
Originally Posted by TRX350d1989 View Post
Hi, Iíve carried on as as advised, and Iíve drained the tank, checked all the fuel pipes, and all seem ok. Iíve moved on to trying to see why the starter has stopped at the same time. Iíve changed the starter relay which clicks after a few minutes of being turned on, and wasnít before at all, but the ignition neutral light and oil temp work perfectly.

When I check the battery voltage is 12.5v, but the leads off the starter relay only give 3.7v?. When the relay clicks I get a 0.14v from the starter motor leads on the starter case. Duff battery? The neutral light goes off when I turn the headlights on.
neutral light goes off when lights are turned on ?, sounds like a short some where in the harness too me ?.

'89 trx350D foreman 4x4...'85 vf700c magna, '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho, '08 vt750c2 shadow spirit
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post #10 of 13 (permalink) Old 08-11-2019, 04:16 AM Thread Starter
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Hi, Iíve carried on as as advised, and Iíve drained the tank, checked all the fuel pipes, and all seem ok. Iíve moved on to trying to see why the starter has stopped at the same time. Iíve changed the starter relay which clicks after a few minutes of being turned on, and wasnít before at all, but the ignition neutral light and oil temp work perfectly.

When I check the battery voltage is 12.5v, but the leads off the starter relay only give 3.7v?. When the relay clicks I get a 0.14v from the starter motor leads on the starter case. Duff battery? The neutral light goes off when I turn the headlights on.
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