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| Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler. |
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12-04-2006, 06:06 PM
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#1 (permalink)
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New Member
Grand Prix 125
Join Date: Nov 2006
Location: SoCal USA
Posts: 21
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I'm the new owner of a stock 2002 Bonneville and have got a question.
Engine response to closing the throttle seems awfully abrupt (to me anyway).
Are there any mods that would reduce this effect?
Does shimming the needle jets or removing the air injection system help?
Thanks
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12-04-2006, 06:30 PM
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#2 (permalink)
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Senior Member
SuperBike
Join Date: Apr 2006
Location: Rehoboth Mass. USA
Posts: 1,513
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Engine response to closing the throttle seems awfully abrupt
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I'm not sure what you mean by abrupt.
Abrupt , fast ,quick, suddenly.
Are you saying it slows down to abrupt. I don't know?
I know the stock set up has a delay in the throttle response.
And rejeting to bigger jets helped by giving it a little
quicker throttle response.
Bill
__________________
2001 Bonnie
1976 Bonnie
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12-04-2006, 06:39 PM
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#3 (permalink)
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Senior Member
World SuperBike
Join Date: Apr 2006
Location: Willingboro, NJ
Posts: 2,054
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a mod to the speed of your wrist will slow it down.
or speed it up.
the throttle (like pretty much all throttles) is designed to snap shut when let go of. modify how fast you close it
G
__________________
I never wanted to lead, and I never wanted to follow.
I just wanted to ride
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12-04-2006, 06:48 PM
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#4 (permalink)
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New Member
Grand Prix 125
Join Date: Nov 2006
Location: SoCal USA
Posts: 21
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What I meant by abrupt was that closing the throttle
relatively quickly at low speed causes a sudden decrease in engine speed (expected) and then the whole bike pitches forward on the front forks.
I was expecting a smoother transition from a light to closed throttle.
The effect seems to be amplified by the soft fork springs.
It's probably just me not being used to the bike yet.
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12-04-2006, 07:07 PM
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#5 (permalink)
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Senior Member
SuperBike
Join Date: Apr 2006
Location: Rehoboth Mass. USA
Posts: 1,513
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It depends on what gear your in. If your at high rev's and
in a low gear she's going to lunge forward when you let
off the throttle.
Bill
[ This message was edited by: bonnevillebilly on 2006-12-04 18:29 ]
__________________
2001 Bonnie
1976 Bonnie
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12-04-2006, 07:08 PM
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#6 (permalink)
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Senior Member
Formula Extreme Favourite Bike: 69 Tiger TR6R
Join Date: Jul 2006
Location: Pottstown, PA
Posts: 903 Other Motorcycle: 2003 Bonneville
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If you're talking about "engine breaking" one way to smooth things out is to increase the idle speed. I'm not going to pretend to know the mechanics behind it but ever since I upped my idle speed for the winter months there's less breaking (and popping, etc.) on decel. I normally keep my idle speed fairly low because I love both the popping and not having to jump on the breaks all the time.
Maybe someone more knowledgeable can explain what's going on here? Just a thought.
__________________
2003 790 Bonne (black, not Black) / 1969 Tiger TR6R (oh so sweet)
If you stole it, ride it like you stole it. Otherwise, don't.
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12-04-2006, 07:26 PM
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#7 (permalink)
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Senior Member
SuperBike
Join Date: Apr 2006
Location: Rehoboth Mass. USA
Posts: 1,513
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What is there to explain? You let off the throttle ,you stop
giving the engine gas ,your in gear.
What's going to happen?
Bill
__________________
2001 Bonnie
1976 Bonnie
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12-04-2006, 07:29 PM
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#8 (permalink)
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Senior Member
SuperStock
Join Date: Feb 2006
Location: N. Texas
Posts: 254
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Short version = Don't worry...it's supposed to do that.
Slightly longer version = If it doesn't do that, then you've got problems (or a two-stroke motor).
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12-04-2006, 08:50 PM
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#9 (permalink)
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Senior Member
Formula Extreme Favourite Bike: 69 Tiger TR6R
Join Date: Jul 2006
Location: Pottstown, PA
Posts: 903 Other Motorcycle: 2003 Bonneville
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Quote:
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What is there to explain? You let off the throttle ,you stop
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Yeah, maybe it is that simple. I guess I was thinking maybe there's something about the bonnie's unique engine config (360 deg, carbs, flywheel, etc.) that makes it more noticeable or pronounced than other scoots.
__________________
2003 790 Bonne (black, not Black) / 1969 Tiger TR6R (oh so sweet)
If you stole it, ride it like you stole it. Otherwise, don't.
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12-04-2006, 09:00 PM
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#10 (permalink)
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Senior Member
SuperBike
Join Date: Apr 2006
Location: Rehoboth Mass. USA
Posts: 1,513
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A lot of it has to do with the gearing.
I depend on the engine helping me slow down.
I noticed a big difference when I switched my front
C.S sprocket from the stock 17T to the 19T.
I had to get used to dropping down a gear to help slow
me down going into a corner.
Bill
__________________
2001 Bonnie
1976 Bonnie
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