Triumphrat

swebb · 12-04-2006

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

bonnevillebilly · 12-04-2006

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

Geoff · 12-04-2006

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

swebb · 12-04-2006

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.

bonnevillebilly · 12-04-2006

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 ]

pabonne · 12-04-2006

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.

bonnevillebilly · 12-04-2006

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

DFWBiker · 12-04-2006

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).

pabonne · 12-04-2006

Quote:

What is there to explain? You let off the throttle ,you stop

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.

bonnevillebilly · 12-04-2006

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