hi-flow accelerator pump for Keihin CV
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hi-flow accelerator pump for Keihin CV
On the older (before the CV) Keihin carbs the Andrews Co. made a hi flow accelerator pump and I used it on a Shovel and a Sportster; seem to remember drilling the bottom of the bowl and using a the Andrews Co. accelerator pump and it made it squirt a healthier stream into the intake.
The other night when the Andrew Co. hi-flow accelerator pump was off on the '84 Sportster it sure looked different than the '99 big-twins CV accelerator pump looked a couple days earlier.
Is there a hi-flow accelerator pump for the Keihin CV carbs? 1999 FLHTC is near stock except air cleaner, dyno-jet, HD mufflers Stage 1.
The other night when the Andrew Co. hi-flow accelerator pump was off on the '84 Sportster it sure looked different than the '99 big-twins CV accelerator pump looked a couple days earlier.
Is there a hi-flow accelerator pump for the Keihin CV carbs? 1999 FLHTC is near stock except air cleaner, dyno-jet, HD mufflers Stage 1.
Last edited by astros; Nov 4, 2011 at 11:27 AM.
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Installed on wife's '06. Impressive upgrade - simple swap - "THE" quintessential CV40 mod!
- Machined to exact tolerances for improved performance/reliability
- Patented QUICKSHOT 3 technology for precise/consistent fuel metering (QS3 chamber completely fills with fuel, eliminating trapped air in system, for accelerated fuel delivery)
- 25% more fuel capacity plus added bleed capability allows for solid fuel delivery 100% of the time
- Dual Check Valves, new ball & spring system keeps fuel dirt from clogging system, second valve located at sprayer for immediate response of fuel spray
- "ON THE FLY" external leak jet adjuster maximizes fuel volume/duration of squirt for all conditions (turn out for hot days/high elevations - turn in to enrich for cold days/low elevations)
- SS plunger rod & 5% stiffer activation arm spring for consistent spray response
- Precisely angled Twin Hole Sprayer enhances fuel velocity/atomization for increased roll-on acceleration
- Removable main jet cap for quick access tuning
- Predictable, smooth, instant throttle response - similar to EFI
- Improved low end performance, quick cold starts, no more hesitation/bog/stalling/backfiring
- Boyesen Unconditional Guarantee - complete refund if not 100% satisfied
http://www.boyesen.com/twinshot-vtwin
http://www.hotbikeweb.com/tech/1004_...t/viewall.html
- Machined to exact tolerances for improved performance/reliability
- Patented QUICKSHOT 3 technology for precise/consistent fuel metering (QS3 chamber completely fills with fuel, eliminating trapped air in system, for accelerated fuel delivery)
- 25% more fuel capacity plus added bleed capability allows for solid fuel delivery 100% of the time
- Dual Check Valves, new ball & spring system keeps fuel dirt from clogging system, second valve located at sprayer for immediate response of fuel spray
- "ON THE FLY" external leak jet adjuster maximizes fuel volume/duration of squirt for all conditions (turn out for hot days/high elevations - turn in to enrich for cold days/low elevations)
- SS plunger rod & 5% stiffer activation arm spring for consistent spray response
- Precisely angled Twin Hole Sprayer enhances fuel velocity/atomization for increased roll-on acceleration
- Removable main jet cap for quick access tuning
- Predictable, smooth, instant throttle response - similar to EFI
- Improved low end performance, quick cold starts, no more hesitation/bog/stalling/backfiring
- Boyesen Unconditional Guarantee - complete refund if not 100% satisfied
http://www.boyesen.com/twinshot-vtwin
http://www.hotbikeweb.com/tech/1004_...t/viewall.html
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From: Phoenix '53, '88, '09 Big Twins
not that I've used or had need for
the boyensen float bowl thingy I think has an adjustable accel pump
But consider unlike your other bikes, the 99 retards timing when the throttle is whacked open ( as the vacuum drops).
are you having trouble when accelerating?
mike
the boyensen float bowl thingy I think has an adjustable accel pump
But consider unlike your other bikes, the 99 retards timing when the throttle is whacked open ( as the vacuum drops).
are you having trouble when accelerating?
mike
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@mkguitar
@mkguitar
not any problem accelerating; but while cleaning jets and pump on Sporty with hi-flow it got me to wondering. it was a low cost item for the old butterfly type Keihins. If it were there and did something I didn't want to miss it.
not any problem accelerating; but while cleaning jets and pump on Sporty with hi-flow it got me to wondering. it was a low cost item for the old butterfly type Keihins. If it were there and did something I didn't want to miss it.
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