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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 10-22-2007   #1 (permalink)
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Question maybe im retarded but...

i took off the snorkel.. result was a louder bike.. it feels good... do i have to rejet? also i read on here that i have adjust the "d" screw... what way should i turn? and what do i have to look for or feel or listen to as a result?
thanks guys

Last edited by ralix13 : 10-22-2007 at 01:18 AM.
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Old 10-22-2007   #2 (permalink)
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There are lots of threads on rejetting and airbox/snorkle mods.
The search function can be your friend, just try different terms and sort criteria.

(Just as an FYI, there are a couple members on this forum that have developmentally-delayed family members and take offense to people casually throwing around the term "retarded".)

Good luck with your mods!
-K
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Old 10-22-2007   #3 (permalink)
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Kframe is correct about the prevalence of re-jetting threads to be found.
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Old 10-22-2007   #4 (permalink)
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Yeah, there's tons of info here about jets, rejetting, how to do, when to do it, balancing the carbs, etc. My personal belief is that rejetting is needed even if you make no changes as the bike comes from the factory jetted too lean (due to emission issues). If you remove the snorkle, arguably you're increasing air flow into the engine a bit, which will increase leaness just a bit.

Remember there are two jets in each carb - main and idle. In your inquiry, I assume that you're referring to the main jet. You can also install the next larger size idle jet, which should make your bike start easier and idle smoother. As a rough approximation, three turns of the D screw is equal to one jump in idle jet size. You don't need special tool to adjust the D screw. Remove it (slip a piece of tubing over it) and use a Dremel or similar tool to cut a slot in it. Don;t crank down on it - it is soft and the tip will deform. Seat it gently, then back out 1 turn (if you've replaced the idle jet ) of 2 1/2 to 3 turns (if you haven't replaced the idle jet.) Also, don't forget to throw away the 8 screws holding the carb together and replace with allen bolts.
PM me if you have further questions.
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