Triumph Trophy

Main Trophy Boards => Triumph Trophy - General Chat => Topic started by: flyingz06 on June 24, 2013, 06:32:29 pm

Title: black carbon deposits around the exhaust tip
Post by: flyingz06 on June 24, 2013, 06:32:29 pm
why?  Ive never had a bike do this, but all my bikes have had chrome like tips and I've never noticed it.
Title: Re: black carbon deposits around the exhaust tip
Post by: w8d4it on June 24, 2013, 06:39:02 pm
Sounds like you are running rich.  Another thought, what grade fuel are you using?
Title: Re: black carbon deposits around the exhaust tip
Post by: flyingz06 on June 25, 2013, 02:12:36 am
93 octane usually.  Running rich.....could that be me hesitation issue at take off and the hesitation at times while cruising?   I assume dealer can adjust?
Title: Re: black carbon deposits around the exhaust tip
Post by: w8d4it on June 25, 2013, 02:58:13 am
The Trophy is designed to run on regular, not premium. I had exactly the same problem plus hard starting on my 2011 Thruxton (which also was designed to run on regular) until I stopped using premium and switched to regular. 
Title: Re: black carbon deposits around the exhaust tip
Post by: flyingz06 on June 27, 2013, 12:22:40 am
hmmmm.  will i mess it up if my next tank i put in the 87 octane?  Cant imagine I would. 

when you said mine did the same.... you referring to carbon deposits only or the hesitation part also?
Title: Re: black carbon deposits around the exhaust tip
Post by: w8d4it on June 27, 2013, 04:55:48 am
Both. Just start running 87 and see what happens. When I switched I started running either Shell or Chervon religiously and the change was remarkable.  But I imagine any quality regular will do.
Title: Re: black carbon deposits around the exhaust tip
Post by: patches on June 27, 2013, 06:50:07 am
I also ran 93 octane in mine for a while (no good reason just ...) and experienced the same "runabilty" issues.  Switched back to regular about a tank or so ago and it does run better.  Some engines designed to run on 87 do actually run worse on 93.  It seems this is one of them.
Title: Re: black carbon deposits around the exhaust tip
Post by: flyingz06 on June 28, 2013, 03:40:28 pm
thanks guys!  I'll try it
Title: Re: black carbon deposits around the exhaust tip
Post by: w8d4it on June 28, 2013, 04:46:30 pm
Should work and in 2-3 tanks be cleared up.  Let us know.
Title: Re: black carbon deposits around the exhaust tip
Post by: Trumpet on July 07, 2013, 04:26:45 am
What variables would make an combustion engine run better on lower octane?

I have never heard that before. I ran a tank of 87 and it seems like I lost power and the engine was somewhat less smother, maybe more noisy...but then again, I have a big imagination like anyone else who is dealing with no facts.

There was a person who claim he ran 89, the middle octane in US pumps and it ran the best. Maybe I will try that next.

One thing I notice is a little backfiring when on the decompression. I know that is due to running "wet". Then again, wet running engine run cooler.

Lots of guys in the C14 forum went to a ECM reflash that cause the engine to run leaner and thus, according to them, gained torque in the mid range rpm. That maybe, but I be willing to bet their engines was also running hotter.

These things are very difficult to ascertain because there are many factors in deciphering how well an engine in running based on fuel type. Especially one as minimal as the commercial vehicle octane. Without valid research we are all shooting the breeze here...at least I am, cause I really don't know for sure.

If I 'feel' anything different with an 89 octane tank I 'll post...
Title: Re: black carbon deposits around the exhaust tip
Post by: Coconut on July 07, 2013, 08:29:27 am
Basically :

The Octane rating is an indication of the compression that is needed before the fuel will auto-ignite.

The higher the Octane number, the higher the compression that is needed,
so higher octane rating fuels are used in higher performance, higher compression engines.

Engine manufacturers specify the fuel to use, according to the compression and design of the engine.

If you use a higher than recommended Octane rating, it is likely that the fuel will not combust as efficiently,
as it will not be reaching the optimum compression before ignition.
( Which is likely to explain the black carbon deposits on the exhaust ).

Using too low an Octane rating can result in the fuel auto-igniting under compression too early - before the spark plug fires,
resulting in the "pinking" noise, or "knock" noise, due to the fuel being ignited twice in one stroke.

Lots of motorists are fooled into paying extra for "Premium" fuels, thinking that they are getting a better quality of fuel,
or that it will make their engine run cleaner or "better" - but this is simply not correct and is a result of
the hype and marketing spin of the fuel companies calling it "Premium" in the first place !

Stick to what is recommended and you won't go far wrong !

(https://cdn.img.triumph-trophy.com/Forum-Main-Avatar.gif)
Title: Re: black carbon deposits around the exhaust tip
Post by: davidw3d on July 07, 2013, 02:57:57 pm
Coconut, you have hit the nail on the head there, well explained.
Title: Re: black carbon deposits around the exhaust tip
Post by: cropbiker on July 07, 2013, 03:12:34 pm
Yeah, these manufacturers spend millions and many years with highly qualified test riders and grey beards in the back ground designing the engine and bike to work with a particular type of fuel...

They don't recommend one for no good reason, go with what they say is best and you will get the best out of the engine and the bike
Title: Re: black carbon deposits around the exhaust tip
Post by: Trumpet on July 07, 2013, 07:49:16 pm
Ok! I am gonna try that 89 and 87 again, a more open mind this time...