T3 Running Badly - Triumph Forum: Triumph Rat Motorcycle Forums
Hinckley Classic Triples 885cc Classic Styled T3's: Legend, Thunderbird, Thunderbird Sport & Adventurer.

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post #1 of 24 (permalink) Old 05-03-2019, 04:35 PM Thread Starter
Grand Prix 500
Main Motorcycle: Bonneville
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T3 Running Badly

My 1999 Adventurer has a chronic miss in the engine. I replaced the jets previously and have pods on the carbs and it has run strong in the past.

Before the last two times I cleaned out the jets and float valves, I had trouble with rust in the tank. Once I coated the tank, gas leaks stopped and the bike ran fine.

I suspect my problem is not in the carbs this time. I just cleaned them out and the jets looked OK. The bike took the throttle until about 2000 RPMs and then would break-up and stall.

I noticed today the right side cylinder ran cooler than the other two. Left and center pipes were 275 F. degrees, but the right pipe was 225 F. degrees. The temperature varied, but the right side pipe was always 50 degrees cooler.

I plan to change out the plugs, maybe switch the right and left plugs.

Does anyone have ideas?

Thanks,
Bonavent
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post #2 of 24 (permalink) Old 05-04-2019, 04:18 AM
Powerbike
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Itís also probable that a coil is on the way out. Swap the coil over and see if the problem follows.
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post #3 of 24 (permalink) Old 05-04-2019, 10:22 AM
SuperBike
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The pipe running cool is a dead giveaway that there is an ignition problem on that cylinder. To confirm it is a coil, switch around the coils to see if the problem moves to another cylinder. The original coils on these things are notorious for causing problems. Might consider replacing all of them if you don't have a history with the bike. Saves a lot of headaches. ...J.D.

Last edited by Wire-Wheels; 05-04-2019 at 10:33 AM.
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post #4 of 24 (permalink) Old 05-04-2019, 03:12 PM Thread Starter
Grand Prix 500
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Thanks for the suggestions on switching coils. I'll do it!

The T3 is my favorite.
Bonavent
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post #5 of 24 (permalink) Old 05-04-2019, 05:20 PM Thread Starter
Grand Prix 500
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The right side exhaust pipe is still 50 degrees cooler after changing the coil, wire, and plug. I have 10.5 volts at the coil feed wires, same as other coils.

The engines misses at 2000 RPMs. Could it be a valve issue? Is it possible the right side carb is not getting sufficient fuel ? I see the ignition sensor wire at the crankcase has sealant on it. Would a bad sensor cause the engine to miss?

Thanks again,
Bonavent
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post #6 of 24 (permalink) Old 05-05-2019, 02:58 AM
Powerbike
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Normally if the pick up coil is bad it will run fine then when hot give up, which might be your prob since the bike is stalling. Bike will then usually start and run fine after itís cooled down.
Certainly worth checking out the pick up coil and resetting the gap.
You said you had issues with rust previously and you donít think itís fuel issue but did you check the little witches hat filter at the carb?
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post #7 of 24 (permalink) Old 05-05-2019, 06:29 AM
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The voltage at the coils is kinda low. Should be above 12. Check your battery and alternator output. This could be causimg some of your problems. I would certainly check in to valve clearance as well.
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post #8 of 24 (permalink) Old 05-07-2019, 08:08 AM Thread Starter
Grand Prix 500
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Thanks again.

The battery is a year old. I charged it yesterday and voltage today was 12.5 volts. Voltage at the coil feed wires read 10.9 volts.

I assume the witch hat filter (duckbill?) resides at the point where the fuel line connects to the carb bank. It was missing.

For some time, yesterday the right side exhaust pipe was cold. After I changed the coil, wires, and plugs around, the cylinder was firing, but still runs 50 degrees cooler than the others.

Before I check the valves and pick-up coil, I'll check for a voltage drain somewhere, ensure the right side carb is getting sufficient fuel, and then switch jets around on the carbs.

I have been cleaning the jets with a piece of wire from a wire brush, done gently I think, but may have scored a jet. I've been doing that all along especially when I had the rusty tank problem. I don't think that's the problem.

I appreciate expert thoughts and time taken to respond.

Thanks, Bonavent
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post #9 of 24 (permalink) Old 05-07-2019, 05:51 PM Thread Starter
Grand Prix 500
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I forgot to add. The alternator is charging: 14 volts at the battery.
Bonavent
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post #10 of 24 (permalink) Old 05-09-2019, 06:50 AM Thread Starter
Grand Prix 500
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This forum has been great help. Thank-you.

I'm almost ready to replace the igniter. I read 11.5 volts at both leads feeding each coil which is puzzling to me.

It also appears sources for igniters are OEM from Triumph or the Czech version.

Thanks again.
Bonavent
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