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| Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler. |
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11-04-2009, 03:31 PM
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#1 (permalink)
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New Member
Minitwins Favourite Bike: Bonneville T100
Join Date: Jul 2009
Location: Mountain View, CA
Posts: 17
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Engine braking
I find the efficiency of my engine braking to be rather poor, especially when downshifting to first gear at low speeds (don't know for sure maybe ~10/15mph), there seems to be almost no (engine) braking going on and the clutch lever feels slack in that speed range... how can this be changed (if at all)?
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11-04-2009, 04:12 PM
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#2 (permalink)
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Lifetime Premium
Site Supporter SOTP Vintage Series Favourite Bike: 2009 Bonneville SE
Join Date: Jun 2009
Location: Asturias, Spain
Posts: 6,865 Other Motorcycle: Yamaha XV1100 Extra Motorcycle: Qingqi QM200GY-BA
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Might be a couple of things: Idle speed too high, or the carb is "hanging up" due to maladjustment . If you blip the throttle in neutral, do the revs drop straight away to idle , or do they hang up for a while before returning to idle?.
Clutch lever free-play should remain constant no matter what revs or speed you're doing.
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11-04-2009, 04:18 PM
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#3 (permalink)
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Member
Grand Prix 125 Favourite Bike: T100
Join Date: Jul 2008
Location: Richmond, VA
Posts: 40
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Also make sure that your chain is the proper tightness.
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11-04-2009, 04:24 PM
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#4 (permalink)
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Forum Liaison
Site Supporter SuperBike Favourite Bike: Tiger 1050
Join Date: Apr 2009
Location: new york city
Posts: 1,416 Other Motorcycle: stay tuned
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This is another one of those threads where people are going to come up with all sorts of complex explanations when the answer is the simplest explanation. It is probably your technique. You are downshifting too late.... and therefore the engine will naturally not be forced to rev much, thereby eliminating the source of stopping power.
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11-04-2009, 04:38 PM
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#5 (permalink)
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Senior Member
Powerbike Favourite Bike: 2008 Bonneville Black
Join Date: May 2007
Location: Portland, OR
Posts: 384
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Do most people engine brake in first gear? I never do. I engine brake in every other gear down to 2nd, then when I'm below 15 or so I just pull in the clutch and drop it to first without re-engaging the gear.
Normal?
Edit: I don't clunk down into first until I'm very nearly stopped.
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11-04-2009, 04:45 PM
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#6 (permalink)
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Forum Liaison
Site Supporter SuperBike Favourite Bike: Tiger 1050
Join Date: Apr 2009
Location: new york city
Posts: 1,416 Other Motorcycle: stay tuned
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Quote:
Originally Posted by SomethingClever
Do most people engine brake in first gear? I never do. I engine brake in every other gear down to 2nd, then when I'm below 15 or so I just pull in the clutch and drop it to first without re-engaging the gear.
Normal?
Edit: I don't clunk down into first until I'm very nearly stopped.
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that is what I do most of the time as well
below 15 you are not going to get much resistance from the engine anyway. That is about when I would begin applying the brakes
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11-04-2009, 04:49 PM
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#7 (permalink)
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Senior Member
SuperStock Favourite Bike: Thruxton
Join Date: Jun 2009
Location: Brooklyn, NY
Posts: 218
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I don't engine break in first gear either, but BlackBonNYC's advice would be my own.
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11-04-2009, 04:52 PM
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#8 (permalink)
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Senior Member
SuperSport Favourite Bike: 2004 Thruxton
Join Date: Jan 2008
Location: Grand Rapids, Michigan
Posts: 1,330 Other Motorcycle: 1971 BMW R50/5 Extra Motorcycle: 1971 CB350
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Clearly a problem with too much flywheel mass. I believe the only real solution here is to split the cases and get the flywheel lightened. Engine braking will be dramatically increased and, as a bonus, the bike will rev quicker on take off.
Regards,
--Rich
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11-04-2009, 06:21 PM
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#9 (permalink)
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New Member
Minitwins Favourite Bike: 03 springer suicide shift
Join Date: Oct 2009
Location: Cincinnati, Ohio
Posts: 10 Other Motorcycle: 07' Bonnie 73'BMW Toaster Extra Motorcycle: KTM 4&2 str. dual sports
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Engine braking
I'm in the habit of at about 10 mph and if i know I'm coming to a stop, I'll put it in neutral while I'm still just barely moving. Once stopped, it's a lot harder to find neutral on all of my bikes. If not moving, some are near impossible. Rarely do I put it in 1st gear until I'm pulling away from a light. Shiner
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11-04-2009, 07:57 PM
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#10 (permalink)
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Senior Member
Site Supporter Legend Favourite Bike: 904cc Bonnie w/magwheels
Join Date: Mar 2006
Location: Austin, Texas
Posts: 11,815 Other Motorcycle: 2005 Yamaha FZ1
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Quote:
Originally Posted by fatass
You should check the tighness of the gas cap.
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whaa???!?? That would have nothing to do with engine braking.
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