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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 12-15-2011, 04:22 PM   #1 (permalink)
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Running Rich. Hotter Plug a Bad Idea?

I have an '08 Bonnie T100. I noticed when I changed the plugs after a year and about 7,500 miles it is running a little rich. This is not suprising as the Carb has 160 High Speed Jet and 42 Idle Jet. My question is, what would be wrong with installing a hotter plug versus reducing the jet size to account for it running a little rich? Other than the plug showing signs of running rich, I am not having any problems.

Thanks!
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Old 12-15-2011, 05:00 PM   #2 (permalink)
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Hmmm...
I wouldn't do that - a hotter plug might burn the tops of your pistons down the road. Rejet. I actually was concerned about this issue because of the extreme heat here in Miami and went the cooler route just recently - from a DPR8EIX-9 to a DPR9EIX-9 which is 1 rating step cooler on the NGK Iridium plugs and have not had any noticable problems. Where are you located?
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Old 12-15-2011, 05:08 PM   #3 (permalink)
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Yes, Unfortunately changing the plug to mask the symptoms of another problem is always a bad idea.

Running with the wrong heat range plug can also cause additional problems that you might not wish to experience and running with too rich a mixture amongst other things can lead to accelerated piston ring wear.

The correct size jets (whatever they might be) probably wouldn't cost that much more than a new set of plugs and should pay for themselves in fuel savings fairly quickly. The bike should also run noticably better when carburated correctly.


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Old 12-15-2011, 05:13 PM   #4 (permalink)
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...and what about my running with cooler plugs? Am I going to end up messing with the dyno settings that I already have on the bike? Any damage that might come from this move?
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Last edited by RICHW; 12-15-2011 at 05:25 PM.
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Old 12-15-2011, 05:34 PM   #5 (permalink)
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from testing I have done the stock heat range is about the best for these bikes you wont gain a thing going colder .As for a/f dont go by plug readings they dont tell you the right a/f on these bikes with the fuel we run now a days.In most cases when the plugs look right to you you will be way rich.160 mains are way to big for cvk carbs on these bikes.You are about flooding the motor.Do yourself a favor get a a/f meter or get it dyno tuned .Your bike will run alot better.Dont waste time and money on plugs.
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Old 12-15-2011, 06:02 PM   #6 (permalink)
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Agree with all. If you are doing a plug read there is a procedure to follow. You can't just look at the plugs when you change them and get any real info.
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Old 12-15-2011, 07:43 PM   #7 (permalink)
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Your 160 mains are just as rich here as they are on BA...
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Old 12-16-2011, 09:48 AM   #8 (permalink)
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Thanks everyone. I am in Maryland. Dinqua's jetting calculator says a 155 main. Should I dial it back from my 160? Thanks again!
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Old 12-16-2011, 10:01 AM   #9 (permalink)
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Quote:
Originally Posted by TriumphMatt View Post
Thanks everyone. I am in Maryland. Dinqua's jetting calculator says a 155 main. Should I dial it back from my 160? Thanks again!
List your mods and someone may be able to help.

Or even have a look in the "Great sources of info...." tech sticky.

Plenty info there.






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Old 12-16-2011, 10:35 AM   #10 (permalink)
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Thanks so much everyone. Here's what I know about the bike:

- Carb has 160 High Speed Jet and 42 Idle Jet
- Re-mapped ignitor with 3% advance
- Air box removed and replaced with K&N air filter
- The mufflers are Norman Hyde "Toga's" on stock pipes
- No shims added to carbs
- Carbs balanced about 6.5k miles ago
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