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| davetac1 | | Thunderbird |  | | Reg. Date | : | 06/09/2010 | | Posts | : | 8,379 | | Location | : | Haverhill, Ma., United States |
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| | Posted : 08 May 2013 - 15:06 Post title : Re: Big clunck on start-up sometimes!! Crank angle sencer??? (Re: KSpider) | | | I think you'll find that most motorcycles will clunk when first kicked into gear right after they're started,especially if they're cold or have been setting for awhile.After the machine gets up to operating temperature or is atleast allowed to run for a few minutes,which allows the oil to run thru the motor/trans/clutch,she should kick into gear pretty easy and with a lot less clunk,if any.That's why I suggested allowing it to warm up a bit before driving off.That's what I learned 50 years ago when I bought my first brandy new scooter and have been doing it ever since.
Another possibility is maybe the handle bar clutch lever isn't adjusted properly.If ya have too much free play at the lever,then the clutch is not fully disengaging when the lever is pulled all the way in,hence you'd get that clunk and or she might shift alittle on the hard side when changing gears. Dave!!!
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| KSpider | | Set | | | Reg. Date | : | 06/05/2013 | | Posts | : | 39 | | Location | : | United States |
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| | Posted : 08 May 2013 - 16:58 Post title : Re: Big clunck on start-up sometimes!! Crank angle sencer??? (Re: davetac1) | | | The clunk happens when I blip the throttle a few seconds after starting the MC not when putting in gear. If I start up then blip right away to prevent it stopping thats when the metal on metal clank sounds, like a hammer hitting the metal.
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| KSpider | | Set | | | Reg. Date | : | 06/05/2013 | | Posts | : | 39 | | Location | : | United States |
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| | Posted : 08 May 2013 - 17:23 Post title : Re: Big clunck on start-up sometimes!! Crank angle sencer??? (Re: EnGage) | | | I have a 2011 1600 ABS crystal white over sapphire blue. Are the decompressors hitting the valves or pistons? I havent heard about them. In the owners manual it says to use Mobil1 mc oil and on the case by the filler Triumph put Castrol as a recommended oil. Reason I mentioned dumbed down I know with wet clutches they dont want the oil too "slippery" and thats why they dont want you using something like syntec that coats the surfaces. I hope the noise wasnt the engine getting trashed.
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| edbob | | Chaac | |  | | Reg. Date | : | 04/04/2012 | | Posts | : | 931 | | Location | : | United States |
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| | Posted : 08 May 2013 - 17:30 Post title : Re: Big clunck on start-up sometimes!! Crank angle sencer??? (Re: KSpider) | | |
KSpider wrote:
The clunk happens when I blip the throttle a few seconds after starting the MC not when putting in gear. If I start up then blip right away to prevent it stopping thats when the metal on metal clank sounds, like a hammer hitting the metal. |
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I would fault something with the decompression mechanism. You may have to give it a few seconds to completely re-compress, and abruptly adding rpms may be forcing it along faster than it's natural pace. If you can help it, don't blip the throttle anymore when she starts up. I can honestly say I've never had to hit the throttle to keep mine running. Although there is a brief drop in rpm's initially, it always catches.
| "You will ride eternal shiny and chrome"
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| Fordster | | Set | |  | | Reg. Date | : | 16/10/2009 | | Posts | : | 365 | | Location | : | Calgary, Alberta, Canada |
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| | Posted : 09 May 2013 - 00:51 Post title : Re: Big clunck on start-up sometimes!! Crank angle sencer??? (Re: edbob) | | | edbob wrote:
KSpider wrote:
The clunk happens when I blip the throttle a few seconds after starting the MC not when putting in gear. If I start up then blip right away to prevent it stopping thats when the metal on metal clank sounds, like a hammer hitting the metal. |
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I would fault something with the decompression mechanism. You may have to give it a few seconds to completely re-compress, and abruptly adding rpms may be forcing it along faster than it's natural pace. If you can help it, don't blip the throttle anymore when she starts up. I can honestly say I've never had to hit the throttle to keep mine running. Although there is a brief drop in rpm's initially, it always catches. |
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The decompressors on mine came apart and snapped the camshaft. (And the bike still ran) There's a thread about it here: Link The tech told me (and a few others on here have also mentioned) that the decompressor has been beefed up but I don't know when that was done.
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| EnGage | | Thor | |  | | Reg. Date | : | 14/07/2009 | | Posts | : | 3,155 | | Location | : | Grand Rapids, MI, United States |
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| | Posted : 09 May 2013 - 00:58 Post title : Re: Big clunck on start-up sometimes!! Crank angle sencer??? (Re: Fordster) | | |
Fordster wrote:
edbob wrote:
KSpider wrote:
The clunk happens when I blip the throttle a few seconds after starting the MC not when putting in gear. If I start up then blip right away to prevent it stopping thats when the metal on metal clank sounds, like a hammer hitting the metal. |
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I would fault something with the decompression mechanism. You may have to give it a few seconds to completely re-compress, and abruptly adding rpms may be forcing it along faster than it's natural pace. If you can help it, don't blip the throttle anymore when she starts up. I can honestly say I've never had to hit the throttle to keep mine running. Although there is a brief drop in rpm's initially, it always catches. |
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The decompressors on mine came apart and snapped the camshaft. (And the bike still ran) There's a thread about it here: Link The tech told me (and a few others on here have also mentioned) that the decompressor has been beefed up but I don't know when that was done. |
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Exactly, that was the reason I asked what year it was.
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| davetac1 | | Thunderbird | | | Reg. Date | : | 06/09/2010 | | Posts | : | 8,379 | | Location | : | Haverhill, Ma., United States |
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| | Posted : 09 May 2013 - 05:27 Post title : Re: Big clunck on start-up sometimes!! Crank angle sencer??? (Re: KSpider) | | | My appologies sir.I misunderstood the question. However,I agree with the rest of the guys.My vote is also on the fly weights on the ends of the decomp mechanisms. Dave!!
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| KSpider | | Set | | | Reg. Date | : | 06/05/2013 | | Posts | : | 39 | | Location | : | United States |
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| | Posted : 09 May 2013 - 10:57 Post title : Re: Big clunck on start-up sometimes!! Crank angle sencer??? (Re: davetac1) | | | Sure hope my 2011 doesnt have that decompression/cam damage. Reading the link it gives me the impression that maybe it is specific to 2009/10 models. My bike only has just under 800 miles on it and Ive babied it during breakin. Any idea if 2011's are affected by this issue also? When I start it I cant detect any issue with it struggling to start like a dead battery that was mentioned so hopefully its just an issue with letting it idle for a minute before touching the throttle to avoid that metal on metal banging sound. The only issue is that sometimes when I first start it, it wont stay running and I have to hit starter again and its fine. As a side question is it worth getting the bigbore kit installed, are there any downsides to going with the bigbore kit? ie horrendous gas mileage or anyother issues. Mines a stock 1600ABS. Wonder if that kit would beef up the decompression unit and cam? Im praying this bike is as reliable as all my Japanese bikes were.
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| mjgt | | Thor | |  | | Reg. Date | : | 16/09/2011 | | Posts | : | 2,201 | | Location | : | North Somerset, United Kingdom |
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| | Posted : 10 May 2013 - 07:12 Post title : Re: Big clunck on start-up sometimes!! Crank angle sencer??? (Re: KSpider) | | | Do not worry abut reliability, I have had 3 Hinckley Triumphs and not had any problems with any of then. One of the early Tridents did 250,000 miles with only minimal engine wear, I believe only one item was found to be worn beyond specification and was subsequently modified for later bikes.
| Mick . . .  Keep the rubber side down!!
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