919 Aluminum throttle tube? - Wrist Twisters
 
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post #1 of 7 Old 04-29-2012, 12:47 PM Thread Starter
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919 Aluminum throttle tube?

I recently started a handlebar swap on my 03 919, and in reassembly I've found that the throttle tube is too tight and the throttle won't return. I've been thinking I might want to do an aluminum throttle tube conversion anyway, since most makers claim they'll cure "throttle snatch."

I'm having a hard time finding any that say they're for the 919. I can find various tubes that fit a couple criteria, but not all: 7/8 diameter, open end, fit inside throttle housing, etc.

Has anyone out there installed one that they can recommend? Or should I just stick with plastic/nylon tube and ditch the bars? (Tolemar drag bars had the most similar dimensions to stock, just wider which is what I was looking for.)

Thanks!

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post #2 of 7 Old 04-29-2012, 01:19 PM
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what bars did you put the stock tube on.

The stock one should work with any 7/8ths bar so long as its adjusted right.

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post #3 of 7 Old 04-29-2012, 01:22 PM
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Quote:
Originally Posted by oxwilder View Post
I recently started a handlebar swap on my 03 919, and in reassembly I've found that the throttle tube is too tight and the throttle won't return. I've been thinking I might want to do an aluminum throttle tube conversion anyway, since most makers claim they'll cure "throttle snatch."

I'm having a hard time finding any that say they're for the 919. I can find various tubes that fit a couple criteria, but not all: 7/8 diameter, open end, fit inside throttle housing, etc.

Has anyone out there installed one that they can recommend? Or should I just stick with plastic/nylon tube and ditch the bars? (Tolemar drag bars had the most similar dimensions to stock, just wider which is what I was looking for.)

Thanks!
IF the bars are truly causal, then an aluminum throttle tube will do nothing to help.
My guess is that the cable routing has been disrupted and/or and the slack improperly set.
And/or the pod is not resting squarely on the bar tube.
And/or the grip you have is lip style and dragging on the bar end instead of having some standoff.

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post #4 of 7 Old 04-29-2012, 01:22 PM
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It would seem that when the bar was chromed they went a bit overboard and it ended up too large a diameter by a small amount. If you are sure you want to keep the bar it's a small amount of work to sand the throttle side down to obtain enough clearance for the tube. Start with 220 grit for gross material removal, then graduate to finer grits to polish the remaining chrome in order to prevent drag on a rough surface.

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post #5 of 7 Old 04-29-2012, 01:27 PM
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Quote:
Originally Posted by robtharalson View Post
It would seem that when the bar was chromed they went a bit overboard and it ended up too large a diameter by a small amount. If you are sure you want to keep the bar it's a small amount of work to sand the throttle side down to obtain enough clearance for the tube. Start with 220 grit for gross material removal, then graduate to finer grits to polish the remaining chrome in order to prevent drag on a rough surface.

Rob
Rob,

I just played with mine re slop.
I'm guessing there is around 20 thou' total diametrical.
Bad lot of tubing with excessive OD perhaps ?
Or, and I think more likely, a bad fitup.
A vernier of stock vs the replacements would instantly tell the story.

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post #6 of 7 Old 04-29-2012, 03:27 PM
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Quote:
Originally Posted by oxwilder View Post
I recently started a handlebar swap on my 03 919, and in reassembly I've found that the throttle tube is too tight and the throttle won't return. I've been thinking I might want to do an aluminum throttle tube conversion anyway, since most makers claim they'll cure "throttle snatch."
If "Throttle Snatch" is a problem on the 919, you may have too much slack in the cables. Both my '03 and '06 have very little free play left after adjustment and do not suffer from the snatch. The condition you describe was very obvoius on my ST1300 especially coming off throttle and then back on in a turn, yielding a pronounced lurch.

Some ST Owners have gone to an aftermarket throttle tube, but I don't know of one for 919.

G2 Tamer Throttle Tubes

Doc



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post #7 of 7 Old 04-30-2012, 09:10 AM Thread Starter
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I think Rob's theory makes the most sense. I'll try polishing down the chrome on these cheapos and see if that reduces the drag on the throttle tube.

Thanks, guys.

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