Anyone drilled their throttle slide? - Kawasaki Vulcan Forum : Vulcan Forums
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post #1 of 16 (permalink) Old 02-20-2018, 02:59 PM Thread Starter
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Anyone drilled their throttle slide?

I am fixing to Grampsize my 1996 800 Classic per Russian Wolf's website; all parts are ordered. I'm going the route that uses the OEM needle. The only thing I have not decided whether or not to do is to drill the hole larger in the throttle slide, it's optional. RussianWolf states:

"This hole can be drilled out larger (1/8”), which theoretically allows the slide to move up and down more rapidly, thus decreasing throttle response time." (He put the word theoretically in italics.)

So, I thought I'd ask folks here who have drilled out their slides if they experienced any differences in performance. Thanks!

For those who are unfamiliar with Grampsizing: http://www.angelfire.com/ak5/russwol.../grampsize.PDF

1996 Vulcan 800, Blue/Green
JUST SOLD: 2016 Indian Scout, Black
SOLD LAST YEAR: 2006 Triumph Rocket III, Black
SOLD LAST YEAR: 1967 Honda 305 Dream, Black

"Going up the country . . . "
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post #2 of 16 (permalink) Old 02-21-2018, 07:01 AM
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I have scooterised my VN800A and drilled the slide, as per Russian Wolf instructions.
The bike is running very well, good throttle response. But I cannot say that I have notice an improvement ...
Definitely is not running worse, after drilling.
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post #3 of 16 (permalink) Old 02-21-2018, 08:42 AM Thread Starter
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Thanks marcelm, good info. Was there an noticeable change in performance when you Scooterized? Gas mileage better/worse?

1996 Vulcan 800, Blue/Green
JUST SOLD: 2016 Indian Scout, Black
SOLD LAST YEAR: 2006 Triumph Rocket III, Black
SOLD LAST YEAR: 1967 Honda 305 Dream, Black

"Going up the country . . . "
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post #4 of 16 (permalink) Old 02-21-2018, 09:06 AM
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Maybe there is an increase in power, but is not noticeable, at least in my case. Maybe other guys here, have different opinion...
Regarding the mileage, is the same, about 5,5l/100km (42,8 mpg), before and after.
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post #5 of 16 (permalink) Old 02-21-2018, 09:52 AM
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Be very very careful about taking a drill bit to any carb at any time.
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post #6 of 16 (permalink) Old 02-21-2018, 10:39 AM Thread Starter
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Quote:
Originally Posted by sfair View Post
Be very very careful about taking a drill bit to any carb at any time.
How so, as it pertains to drilling out this hole? Careful by doing a good, neat, thorough job? Careful by not knowing what you will get once it's drilled and you twist the throttle? Careful by affecting your entire fuel delivery system?

We value your input sfair. I (and others) are trying to decide whether or not to drill, or not to drill. Any insight other than 'be very, very careful' would be greatly appreciated. I shutter at the thought of drilling on a perfectly good carb, but I'm also curious. LOL Thanks!

1996 Vulcan 800, Blue/Green
JUST SOLD: 2016 Indian Scout, Black
SOLD LAST YEAR: 2006 Triumph Rocket III, Black
SOLD LAST YEAR: 1967 Honda 305 Dream, Black

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post #7 of 16 (permalink) Old 02-21-2018, 12:08 PM
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I have drilled the slide carb, cut about 2 turns of the sprind slide, 50 pilot jet, 170 main jet, stock needle raised up 2 mm ... and no issue.
But, this is me ... as each bike is different, I think same with the carburetors.
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post #8 of 16 (permalink) Old 02-21-2018, 01:09 PM
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Are you having issues with the carb tuning as it sits?
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post #9 of 16 (permalink) Old 02-21-2018, 01:30 PM Thread Starter
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No issues, bike runs perfectly. (Cobra tapered exhaust with welded in baffles, 150 pilot, stock air system.)

Just trying to decide whether or not to enlarge the hole to 1/8" in the vacuum valve (aka throttle slide) when I experiment by Grampsizing. Risk/benefits, I guess. Not a fan of drilling unless I can reap some rewards.

1996 Vulcan 800, Blue/Green
JUST SOLD: 2016 Indian Scout, Black
SOLD LAST YEAR: 2006 Triumph Rocket III, Black
SOLD LAST YEAR: 1967 Honda 305 Dream, Black

"Going up the country . . . "

Last edited by texasgrape; 02-21-2018 at 01:38 PM. Reason: added info
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post #10 of 16 (permalink) Old 02-21-2018, 01:57 PM
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Quote:
Originally Posted by texasgrape View Post
No issues, bike runs perfectly.

s.
You have answered your own question. If you want it to run more perfectly, then a dyno tune would be your next step.
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