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| petpet | | Set |  | | Reg. Date | : | 07/03/2018 | | Posts | : | 4 | | Location | : | France |
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| | Posted : 31 May 2018 - 08:26 Post title : belt tension and clanking engine thunderbird | | | Being a victim of motor rattling, too, you know the cause of this problem was solved by TRIUMPH, because it seems that the piston change would not solve the problem completely.
Another question, how much you stretch your belt because the recommendation TRIUMPH (7.5 / 9 wheel ar raised) seems tight.
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| gwight | | Chaac | |  | | Reg. Date | : | 26/04/2011 | | Posts | : | 761 | | Location | : | Broken Hill, N.S.W., Australia |
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| | Posted : 31 May 2018 - 10:08 Post title : Re: belt tension and clanking engine thunderbird (Re: petpet) | | |
petpet wrote:
Being a victim of motor rattling, too, you know the cause of this problem was solved by TRIUMPH, because it seems that the piston change would not solve the problem completely.
Another question, how much you stretch your belt because the recommendation TRIUMPH (7.5 / 9 wheel ar raised) seems tight.
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Petpet, I found that 20mm slack is good when cold because when you go for a half decent ride, both pulleys heat up & expand thus making the belt tension to roughly spec., about 10mm. Any more tension than that & the dreaded "belt chirp" may come into play.
Guido. 
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| Hornet | | Jupiter | |  | | Reg. Date | : | 05/05/2013 | | Posts | : | 1,294 | | Location | : | United States |
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| | Posted : 31 May 2018 - 13:02 Post title : Re: belt tension and clanking engine thunderbird (Re: petpet) | | | petpet wrote:
Being a victim of motor rattling, too, you know the cause of this problem was solved by TRIUMPH, because it seems that the piston change would not solve the problem completely.
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Can someone please translate this statement. I saw this same thing posted in another forum.
If the problem "was solved by TRIUMPH" please enlighten the group.
| You'll never be first but you might be next
2014 Commander
| | Post edited by Hornet on 31 May 2018 - 13:03 |
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| MotorMac | | Jupiter | |  | | Reg. Date | : | 29/08/2010 | | Posts | : | 1,847 | | Location | : | Nor Cal, United States |
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| | Posted : 31 May 2018 - 14:21 Post title : Re: belt tension and clanking engine thunderbird (Re: petpet) | | | petpet wrote:
Being a victim...
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Motorcycles are not a good choice for 'victims.'
They require first-hand responsibility and proper maintenance.
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| fab | | Thor | |  | | Reg. Date | : | 12/10/2009 | | Posts | : | 2,515 | | Location | : | wyong, nsw, Australia |
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| | Posted : 31 May 2018 - 19:21 Post title : Re: belt tension and clanking engine thunderbird (Re: MotorMac) | | |
MotorMac wrote:
petpet wrote:
Being a victim...
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Motorcycles are not a good choice for 'victims.'
They require first-hand responsibility and proper maintenance.
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Remember, soft cocks hang around all life long, hard ones come and go
ahh f**k im deep
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| AZCactus | | Taranis | |  | | Reg. Date | : | 01/05/2013 | | Posts | : | 4,500 | | Location | : | AZ |
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| | Posted : 31 May 2018 - 23:01 Post title : Re: belt tension and clanking engine thunderbird (Re: Hornet) | | | I think pet was asking a question (lost in translation): Do you know the cause of this problem and if Triumph solved it?
Anyway I don't have a problem...she's lean & mean and I've not poped the clutch in 1st gear, full throttle for fear of Landing 
| 2009 Thunderbird 1700 Big Bore
| | Post edited by AZCactus on 31 May 2018 - 23:51 |
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| daz | | Zeus | |  | | Reg. Date | : | 12/05/2009 | | Posts | : | 7,709 | | Location | : | United States |
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| | Posted : 01 Jun 2018 - 04:40 Post title : Re: belt tension and clanking engine thunderbird | | | Triumph has not solved it as far as i know, and furthermore i personally believe that thats one of the reasons they discontinued it if not the main one.
As to the belt, i started using less slack years ago when everyone at this forum seemed to think triumph's spec was too tight. Nothing but problems since and about a year ago i went back to setting it tight as per triumph's spec and i now have less noise and the bike feels better. I think that spec was not determined by triumph but by Gates, the maker of the belt and pulleys. And if i'm going to believe any source it would be them being that they are THE belt/pulley manufacturer for harley and the Tbird and probably more other bikes than any other company, assuming there even IS another that makes them for bikes.
| 2010 Blue/White Thunderbird, "Brutus". 1700 kit, short tors, gutted cat, UNI filter, filter seal off, custom tune. Brutus in his native habitat: Link
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| alatamoc | | Set | |  | | Reg. Date | : | 12/06/2015 | | Posts | : | 73 | | Location | : | United Kingdom |
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| | Posted : 01 Jun 2018 - 07:02 Post title : Re: belt tension and clanking engine thunderbird (Re: daz) | | | Just for the record then, shall we summarise the theories......
1.exhaust decompression cams broken or rattling.
2.Loose cam chain.
3.Poor oil pressure to the hydraulic tensioner.
4. Piston slap.
5.Cylinder liners loose.
6.Piston skirts hitting the head gasket.
Any more I haven thought of?
Problems more prevalent on 1700 bikes... especially LT and Commanders.
On my previous Tbird (LT) new liners and pistons solved the problem for 400 miles then it started again.
It'd indeed be nice to have a definitive reason for this noise but I suspect it'll remain a mystery on a par with the Marie Celeste and the Bermuda Triangle.
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| Hornet | | Jupiter | | | | Reg. Date | : | 05/05/2013 | | Posts | : | 1,294 | | Location | : | United States |
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| | Posted : 01 Jun 2018 - 12:21 Post title : Re: belt tension and clanking engine thunderbird (Re: alatamoc) | | |
alatamoc wrote:
Just for the record then, shall we summarise the theories......
1.exhaust decompression cams broken or rattling.
2.Loose cam chain.
3.Poor oil pressure to the hydraulic tensioner.
4. Piston slap.
5.Cylinder liners loose.
6.Piston skirts hitting the head gasket.
Any more I haven thought of?
Problems more prevalent on 1700 bikes... especially LT and Commanders.
On my previous Tbird (LT) new liners and pistons solved the problem for 400 miles then it started again.
It'd indeed be nice to have a definitive reason for this noise but I suspect it'll remain a mystery on a par with the Marie Celeste and the Bermuda Triangle. |
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Indeed ! 
| You'll never be first but you might be next
2014 Commander
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