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Old 07-02-2011, 07:44 AM   #16
XDragRacer
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Quote:
Originally Posted by Kawidad View Post
Besides almost every other bike out there has performance stuff, why not us?
Hey, go for it, Kawidad, if removing some milliseconds of delay between throttle opening and slide elevation is worth it to you!

The accelerator pump merely dumps raw fuel into the carburetor venturi upon throttle opening, preventing a fuel-lean condition at the slide-opening instant; the CV carburetor opens the slide when intake air velocity produces sufficent vacuum, concurrently supplying an acceptable air/fuel mix to the engine . . . KLRistas typically enhance throttle response by hogging out the slide vacuum port (to 7/64" diameter).

What is the MSRP (Manufactuer's Suggested Retail Price) of a typical 40 mm pumper slide carb these days? [Answering my own question, I found for $ 289.95 on the Web, "40mm MIKUNI TM Flat Slide smoothbore Pumper carburetor TM40/6 with accelerator pump for 4-stroke use." ]

Regardless, if your riding style profits sufficiently from implanting a pumper carb, as mentioned, go for it!

XDragRacer screwed with this post 07-02-2011 at 08:01 AM
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Old 12-11-2012, 08:58 AM   #17
Chazangie
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Gotta chime in and try to bring this thread back to life. I have installed a Harley pumper as well as a Mikuni TM38 non pumper. Both Carbs suck. What I have:
92 KLR650 punched to 665 with 101mm Wossner piston (amazing) LA sleeve, p&p head, intake and exhaust ground and matched to the head, airbox mod, White bros E2 exhaust. Stock header
They weren't very good on what they came on for that matter.
Here's the skinny and fat:
Harley pumper
40 pilot
150 main
883 needle
Had to modify the pull pull throttle cable and Harley cable mounts on the carb
custom intake adapter(filter side) and modified intake hose.
Hang up: The Harley CV needle jet diam is larger in the seat. The CVK needle jet just drops through the whole thus forcing me to use Harley jet needle, needle jet, and emulsion tube.
Conclusion:
No enricher= always gonna pop on decel like a Harley. After trying several main jet combos and hours of tuning the ac pump with shims, I was unable to get it right. Yield=more fuel burned, engine pops on decel. My fully worked CVK was better.
PM for pics.
I will do a write up on the TM tonight
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Old 04-10-2013, 03:06 PM   #18
hayduke.klr07
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Quote:
Originally Posted by juames View Post
Anyone ever put a pumper carb on a KLR and is it worth it?
I know nothing of a pumper carb but.....

Was just in Moab and made the obligatory stop to Arrowhead. Fred is working on supplying a plug and play carb. It is a Mikuni performance carb. The way it was explained to me is that the stock carb/diaphragm works on a vacuum. You need rpms for vacuum which reduces throttle response. Seems like something I want to do to my moto. Problem is I just got my hands on an xt225 which is taking my attention right now.

I saw this carb and talked to Fred about just a couple of weeks ago. Thought I would share the info.
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Old 04-10-2013, 03:57 PM   #19
SkiBumBrian
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I run a 44mm Lectron PowerJet. Took me mega times tank on and off to get the metering rod right, carb is cold blooded but overall awesome performance. No need for anything but the CVK unless extensive headwork and BB done....
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Old 05-19-2014, 11:02 AM   #20
tom c
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I rode a buddys' DR650 this weekend - he had installed a pumper carb and found that it improved throttle response. Indeed his DR seemed more responsive than my KLR650.

per Chazanies earlier post - Arrowhead Motorsports in Moab is now making the Mikuni Performance Carb Replacement Kit - $265.95.

http://www.angelfire.com/ut/moab/klr_fuel_air.html

Has anybody out there done this to their KLR?
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Old 05-19-2014, 11:22 AM   #21
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Quote:
Originally Posted by tom c View Post
per Chazanies earlier post - Arrowhead Motorsports in Moab is now making the Mikuni Performance Carb Replacement Kit - $265.95.
Slide (vs. CV) carb, but . . . ain't a pumper, IIRC.

Harley CV40's have accelerator pumps; Kawasaki actually had at one time a CVK40 with accelerator pump for a cruiser. Mounting challenges are manifold (no pun intended) when implanting an accelerator-pumped CV carb onto a KLR650, men say.
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Old 05-21-2014, 02:48 AM   #22
Old Kiwi#99
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another possibility:http://www.ebay.com/itm/Arctic-Cat-A...e92c8b&vxp=mtr

Sure looks like an accelerator pump at the bottom of the bowl
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Old 05-21-2014, 07:36 AM   #23
TNC
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Quote:
Originally Posted by Beezer View Post
I saw a thread about that a couple years ago somewhere... prolly on dot net. The Hardleys use a CV 40 on (I think) the Sportster. The casting is a bit different because of the air filter. They are around as a take off due to "upgrades". I saw one in a junk store & considered it, but didn't make the leap. The down side is it would kill the fuel mileage no doubt, and I finally decided it wasn't worth it to me. The 685 & some head work, an exhaust system & carb kit does pretty good....
It's not a given that fuel mileage will be affected negatively. On the KLX250's the TM34 and TM36 actually improve fuel mileage when jetted properly. I'm running the TM36-68 on my '06 KLX250S with a 300 cylinder. It was one of the best mods I've done to this bike. I've had 4 KLR600/650's over many years, and I think I'd find a way to install the Mikuni HS40 which is the exact same carb as my TM36...just 2mm bigger.
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Old 05-22-2014, 07:02 AM   #24
Kawidad
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Quote:
Originally Posted by Old Kiwi#99 View Post
another possibility:http://www.ebay.com/itm/Arctic-Cat-A...e92c8b&vxp=mtr

Sure looks like an accelerator pump at the bottom of the bowl

Yep, sure enough that is an accelerator pump.

Nice find.

It looks like it has A LOT of possibilities.
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Old 05-22-2014, 08:02 AM   #25
itsatdm
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The 1996-2004 Kawasaki 1500 cruisers had hybrid 40mm CV/pumper carbs
https://www.google.com/search?q=kawa...w=1067&bih=475
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Old 05-22-2014, 10:08 AM   #26
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Quote:
Originally Posted by BikePilot View Post
I'm fairly certain it will add a lot of throttle response and prevent the carb from shutting down on really hard impacts. Probably limited utility on the road, but perhaps helpful in the dirt if you like to snap the front end up quickly on just throttle. I had a pumper on my DR350 and, unlike an above poster, thought it made a tremendous difference. I also have one on my XR650R that works quite well. For street/dirt road use it probably isn't worth it.
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Bearing in mind, the bike still weights 425 pounds... Throwing a little more gasoline at the fire isn't going to make it get up and TANGO.
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Old 05-22-2014, 01:27 PM   #27
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Pumper? Who needs that if you got two carbs?

For real though, I believe every big thumper needs a pumper if you're going to be whacking the throttle.
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Old 05-23-2014, 07:01 AM   #28
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Originally Posted by RFVC600R View Post
Pumper? Who needs that if you got two carbs?
Kinda like who needs a 21" front wheel when you can have a 23".
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Old 05-23-2014, 09:24 AM   #29
XDragRacer
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Originally Posted by RFVC600R View Post
Pumper? Who needs that if you got two carbs?
I think the purpose of the accelerator pump was to address the fuel-lean condition at the instant of rapid and full throttle opening, an issue independent of the number of carbs.
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Old 05-23-2014, 02:05 PM   #30
RFVC600R
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Quote:
Originally Posted by Kawidad View Post
Kinda like who needs a 21" front wheel when you can have a 23".
23" front wheel is to make the freeway more fun, duh! The 80's were awesome, lot's of money wasted on designing motorcycles. Companies don't take weird chances anymore.
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