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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 11-23-2012, 12:46 AM   #1 (permalink)
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How lean will I be running?

I've got an EFI Scrambler and I'm thinking about pulling the snorkel and baffle. Obviously, this is going to make me run a bit leaner. If I do this, should I stop riding until I get the new tune or will it be alright to ride for short trips (to and from work, etc.)?
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Old 11-23-2012, 01:03 AM   #2 (permalink)
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It will run quite a bit leaner. On carbed bikes, as a comparison, snorkel and restrictor plate removal means increasing main jet size by 5 points.

Read the post linked to below. Pieman comments on doing just that on EFI bikes.

http://www.triumphrat.net/twins-tech...ml#post2376399

In normal day to day running you'll be OK until such time as it can be re-mapped.
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Old 11-23-2012, 10:36 AM   #3 (permalink)
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If you were to do away with the Air Injection at the same time, you might not be running as lean; the two changes would sort of offset each other.
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Old 11-23-2012, 11:35 AM   #4 (permalink)
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If you were to do away with the Air Injection at the same time, you might not be running as lean; the two changes would sort of offset each other.
Apart from the fact the the AI injects air into the exhaust (and then only under specific conditions) so won't affect the AFR in the cylinder..
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Old 11-23-2012, 02:47 PM   #5 (permalink)
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Thanks Forchetto. Some days I long for the ease that came with a good old carb. Luckily winter is getting into full swing here so I'm not planning on making any long rides so I think I'll go ahead and pull that stuff today.
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Old 11-23-2012, 04:43 PM   #6 (permalink)
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AI removal will not impact combustion AFR;removal will effect (reduce) exhaust popping in non-cat exhaust
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Old 11-23-2012, 09:16 PM   #7 (permalink)
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Y'all are correct, my mistake. What I meant to say is removing the AI will help the engine run a bit cooler, thus allieviating some of the heat buildup from a leaner mixture.
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Old 11-24-2012, 12:49 PM   #8 (permalink)
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Yeah, I shoved a marble into the AI hose the week after I got the bike (what a huge difference that makes in the throttle).

As an update, I pulled the baffle and snorkel and love the extra intake sound. I still need to do the adaptive reset, but so far I like it.
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Old 11-25-2012, 12:34 PM   #9 (permalink)
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As an update, I pulled the baffle and snorkel and love the extra intake sound. I still need to do the adaptive reset, but so far I like it.
It does sound way nicer once removed. It is a lot throatier. I've been running mine without the snorkel for a few weeks. I actually feel like the bike got a little hotter, but its so cold here I can't really tell (although getting cool makes more sense with the leaner mix). I am planning a remap soon. To answer your question though: take it off and ride.


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