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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 01-11-2009, 11:37 AM   #1 (permalink)
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19 tooth = all smiles! 04 BB

Finally got the 19t installed, what a difference a whole new bike arrived. Its far more relaxed now going down the road. the down side is its not as quick off the line, but it wasent very fast to start with. Like everyone said no more searching for 6th gear, sometimes i forget to shift to 5th. Want to haul arse just click her down a couple gears and away you go. No going back for me!

Now its on to see if the 41 mpg improves, if so i will be a happier camper....riding this bike always puts a smile on my face sweeet!
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Old 01-11-2009, 12:42 PM   #2 (permalink)
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Nice initial report - my 19T is somewhere between Texas and Dublin, I'll let you know how I found it!
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Old 01-11-2009, 04:59 PM   #3 (permalink)
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I've been thinking about the 19 tooth option too. My BB is OK at 65 mph, busy at 70 and I feel like I'm working her pretty hard at 75, cruising not short bursts. Interstate traffic is insane and I find myself at 70-75 a lot. Would this make the bike feel more like it is working at the 65 mph rate?
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Old 01-11-2009, 06:13 PM   #4 (permalink)
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bsakel - yes!
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Old 01-11-2009, 09:16 PM   #5 (permalink)
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19t

I'm a little worried how it will affect my "quickness" off the line at lights and such. I also like the broad range of 3rd gear in the canyons here in CA, and I'm worried the 19t could affect the bottom end of 3rd gear. You guys have any thoughts on that?

Thinking of doing the cams first, which I'm told will give me 10-12 hp . . . but I also want to do the suspension. Decisions decisions!

I wear earplugs on the highway which helps me deal with the high revs up at 80-90mph . . . guess I'll have to put up with it awhile more
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Old 01-13-2009, 06:20 PM   #6 (permalink)
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It is slower off the line for sure instead of zip zip zip into 5th gear each one winds out more now, far more relaxed ride. If you run 80 mph alot you would really like a 19. I spent most of my time between 60 and 70 there is a sweet spot on this bike at about 68 indicated. The engine is really smooth and sounds great.

The nice thing about changing a countershaft sprocket is its cheap and easy to do. 15 minutes and your on your way. My guess is once you change it and ride for a couple of days, it will take that long to get use to it, you wont want the buzzing bee anymore.
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Old 01-13-2009, 06:33 PM   #7 (permalink)
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What size rear sprocket are you running with the 19 frount

IAN
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Old 01-13-2009, 06:38 PM   #8 (permalink)
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Question Interesting Post

I have an 08 Black Bonnie and I find the high revs on the highway very annoying. It sounds like the machine is working way too hard and above its comfort level (I know that it can handle it, I just don't like it).

Like everybody else, I wanted to explore the 19 tooth option, but when I spoke to the guy at the shop, he looked at the ‘Bonnie book’ and said that to change the rear sprocket, I would need to change the front one as well. To do all this would cost several hundred bucks and be a major operation.

Now, I don't know much about mechanics, but I have never heard this before in the forums. Changing to a 19 tooth sprocket appeared to be the standard cheap option for solving this problem.

Can anybody advise, please?? Can’t I just slap on the 19 tooth on the rear?
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Old 01-13-2009, 07:03 PM   #9 (permalink)
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Hey, Nudiefish, I am new here, too.

I think that they are talking about putting a 19 tooth on the front, not the rear. If you ran a larger gear up front and a smaller one on the back, like a bicycle, for every revolution of the crank, you would get more than one revolution of the rear wheel. This is great for bicycles, since we do not generate very much power, but on a motorcycle, we might end up going 200 mph in first gear. ;-)

By replacing the front cog with a gear with more teeth, the engine will rev fewer times for a single revolution of the rear wheel. So at highway speeds, your engine should be running at a lower, more relaxed RPM.

I am definitely interested in doing this myself. My T100 is plenty fast off the line, and I would be more than willing to give up a little acceleration for a more relaxed highway ride. I find myself looking for that non-existent sixth gear to many times. :-)
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Old 01-13-2009, 07:05 PM   #10 (permalink)
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That would be "too" many times. I really should proofread these things.
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