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#397749 - 10/07/11 2:27 am 2002 Thunderbird noises at low revs
Les Binnell Offline
BritBike Forum member

Registered: 08/25/09
Posts: 15
Loc: Ontario Canada
My 900cc Thunderbird is quite noisy at low revs, but when it reaches 3200 in second or third, it goes noticably quieter.I think this is happening in the higher gears too, but not so obvious, because by then the wind is masking it. I've owned it for two years, and its fairly low mileage at 5000 miles. I'd like to look into this over the winter, does anyone have any ideas?

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#406937 - 12/03/11 11:12 pm Re: 2002 Thunderbird noises at low revs [Re: Les Binnell]
highway Offline
BritBike Forum member

Registered: 09/20/06
Posts: 398
Loc: hamilton on. can.
They are noisey engines, straight cut gears make them sound like desiels at low revs, especialy while lugging. I suggest riding at higher revs, the red line is 9000, 3000 is lugging.

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#408496 - 12/13/11 12:39 pm Re: 2002 Thunderbird noises at low revs [Re: Les Binnell]
BSAJIP Offline
BritBike Forum member

Registered: 02/08/08
Posts: 244
Loc: Ohio
Les,

My Triumph 865, 2011 Bonneville is a little noisey at first start-up. It will quiet down after warm-up, but I'm switching to 15W50 oil to see if that has an effect on the noise.
The manual suggests either 10W40 or 15W50.
BSAJIP

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#408972 - 12/16/11 8:46 pm Re: 2002 Thunderbird noises at low revs [Re: Les Binnell]
joe a. Offline
BritBike Forum member

Registered: 10/14/02
Posts: 480
Loc: minnesota
hi,
i service modern triumphs along with vintage machines and think you may want to r&r plugs, ck valve clearances and carb sync(which can increase engine noises considerably)....also make sure the rubber manifolds(joints)are not cracked or leaking either.
joe@ vcycle
www.joesvcycle.com


Edited by joe a. (12/16/11 8:47 pm)

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#410025 - 12/23/11 8:00 pm Re: 2002 Thunderbird noises at low revs [Re: Les Binnell]
Big Al in York Online   content
BritBike Forum member

Registered: 03/07/10
Posts: 57
Loc: York, PA
It could be valve clearances or timing chain, but with 5000 miles that really is unlikely.

I do suspect, as Highway suggested, you are just riding at rpm levels that are too low. The water-cooled triples like the higher rpm range.

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#410030 - 12/23/11 8:24 pm Re: 2002 Thunderbird noises at low revs [Re: Les Binnell]
Ger Offline
BritBike Forum member

Registered: 09/23/05
Posts: 4328
Loc: Netherlands, Rotterdam area.
These engines are unhappy below 3000 rpm.
Try to rev above that.
_________________________
Ger B
BSA A-65T 1971, nicknamed "De fiets" (the bicycle);
Triumph Trophy 900 1996, nicknamed "Dat andere ding" (that other thing).

http://www.mijnalbum.nl/Grotefoto-T4S7BCBJ.jpg
http://www.mijnalbum.nl/Grotefoto-88UQ7QNS.jpg

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#411615 - 01/03/12 10:44 pm Re: 2002 Thunderbird noises at low revs [Re: Monty]
KevRasen Offline
BritBike Forum member

Registered: 07/16/10
Posts: 127
Loc: London,Great Britain
At 5000 miles you don't need to look at more than the valve shims - even those are probably OK.
I've had a 97 Trident 11 yrs now and it's at 95K and still goes well.
It's always rattled at low revs, worried about it first but in the end you forget about it.
Check your valve shims about every 10 to 15K miles, change the cam chain every 30K - it's quite an easy job if you do it when you're shimming the valves and the cams are out.
I've always used Mobil 1 oil, changed every 3000 miles and it's always needed about 1/2 pint every 1000 miles to top up.
These engines run best when you ride em hard - get it on the motorway at 100 for about an hour and see how it clears out.Not screaming the balls off it but making it work.
I've ridden my to Spain and back half a dozen times and it is noticeably better after a good hard run than when you're fannying about on it round town.

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#411698 - 01/04/12 4:28 pm Re: 2002 Thunderbird noises at low revs [Re: KevRasen]
Les Binnell Offline
BritBike Forum member

Registered: 08/25/09
Posts: 15
Loc: Ontario Canada
I agree 3000 is too low of course, my concern was, why is it there at all, and why disappear above 3000. Anyway, it is obviously common to the bike, and I have now stopped worrying about it. Thanks to all who offered their help.
Les

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