Igniter or not. - 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 43 (permalink) Old 04-29-2019, 06:44 AM Thread Starter
Grand Prix 125
Main Motorcycle: 99 Thunderbird sport
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Igniter or not.

My 900 sport has a fault which i can not pinpoint, i have has some improvement but not cured it.
when not under load but warm my bike will rev past 4500, but when riding it starts to splutter and pop as soon as i get to 4200 4500 this varies slightly. and if i hold it at 4500 5000 it will not go any higher. i suspect igniter cdi, but not sure and its an expensive item just to buy and find its not at fault. mu thunderbird 900 sport is a 99 model, the igniter looks like it has been replaced at some point ,Its the type that can be opened ,and the pcb removed. i read some where that heating the main plug spikes up and melting the solder on the pcb can eliminate a dry joint,which i have done to no avail.
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post #2 of 43 (permalink) Old 04-29-2019, 07:14 AM
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Just a stab in the dark here but maybe the ignition advance isn't set correctly for the higher RPMs. Is it possible to connect a computer to the CDI and confirm what you have for advance settings?

Noel
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post #3 of 43 (permalink) Old 04-29-2019, 08:20 AM Thread Starter
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Its pre ecu Noel so no means of connecting the cdi, its pre programmed as are all cdi,s

Last edited by tige; 04-29-2019 at 08:28 AM.
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post #4 of 43 (permalink) Old 04-29-2019, 11:34 AM
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It could be the ECU but unlikely.
It is classic blocked or poorly set-up carb behavour. 4000RPM about is where your main jet takes control from the pilot system.
Have you changed the pie or cans?
Have you modified the airbox or changed the filter?
Has the bike been standing for a long time?
When this happens does applying the choke help?

Good luck
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The throttle works both ways
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post #5 of 43 (permalink) Old 04-30-2019, 01:02 AM Thread Starter
Grand Prix 125
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igniter or not

I have taken the carbs off stripped and cleaned them, fitted new pilot screws float stop pins taken the jets out and cleaned them with carb cleaner and compressed air, all jets and emulsion tubes where clear, the diaphragms all looked good , but maybe i need to take them out again and check against a light, the air box is standard and good , it has had a new filter. it revs out ok when not being ridden and just warmed up.I tried pulling the choke when running at 4500 and it just seems to die slightly ,I would have expected an improvement if it was struggling for fuel.

Last edited by tige; 04-30-2019 at 01:50 AM.
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post #6 of 43 (permalink) Old 04-30-2019, 06:23 AM
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Quote:
Originally Posted by tige View Post
Its pre ecu Noel so no means of connecting the cdi, its pre programmed as are all cdi,s
Ah I see. Sorry I made an assumption that it was an aftermarket type programmable ECU (Ignitech, etc.). In that case, maybe the coils are acting up. If they are the original coils, they are 20 years old now with a lot of exposure to the elements/engine heat. Perhaps a new set would clear up the issue (it's good to have a spare set on hand as well even if that isn't the issue at the moment).

Noel
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post #7 of 43 (permalink) Old 04-30-2019, 12:31 PM Thread Starter
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Coils

The coils are new, Nology ones , I have managed to find another 900 sport owner that's only 10 miles away and he has agreed to test my cdi on his bike, Which is very kind of him, I will come back and let you know. many thanks for every ones time. appreciate it.
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Last edited by tige; 04-30-2019 at 11:52 PM.
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post #8 of 43 (permalink) Old 06-30-2019, 01:40 AM Thread Starter
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tested

my cdi /igniter was tested on another bike and is 100% working. so i swapped the pick up for a new one, i tested and found very little improvement other than it now the missing starts at 5000 revs not 4200, So i replaced the ht leads,Which made no difference, i did find if i hold it at 5000 revs it eventually goes beyond 5000 and up to 7000, Not really sure what to try next.
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post #9 of 43 (permalink) Old 06-30-2019, 08:57 AM
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Are you running the stock airbox?

Lucas' Law: 90% of all ignition problems are carburetion.

John
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post #10 of 43 (permalink) Old 07-01-2019, 12:14 AM Thread Starter
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Tested

Yes, Still standard.
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