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Old 06-27-2011, 07:38 AM   #1
juames OP
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KLR650 + Pumper Carb?

Anyone ever put a pumper carb on a KLR and is it worth it?
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Old 06-27-2011, 07:41 AM   #2
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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 haven't. I would be interested in knowing also. Gonna do a 685 kit this winter and if a pumper makes a differance it would be good to know.

Good question.
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Old 06-27-2011, 08:17 AM   #3
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I'd be interested in that too. However, my personal experience with a Suzuki DR350 is that it's overrated. I was told about the magical transformation of the bike with the different carb (cv to pumper). I did it and not doubt it was better, but magical no. In fact, I'm not sure it was worth the money.

But, having written that, I'm definitely open to this idea on the KLR.
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Old 06-27-2011, 08:41 AM   #4
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Too expensive for a KLR!




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Old 06-27-2011, 08:48 AM   #5
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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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Old 06-27-2011, 11:53 AM   #6
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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....
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Old 06-27-2011, 02:16 PM   #7
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On late model klrs i think the flywheel is to heavy.I think for a pumper carb to do it's thing on a klr, you would have to sort out the fly wheel.Early model fly wheels are lighter.Instead of Kawasaki giving us more grunt over the years,they just gave us a heavy fly wheel.A cheap trick to make you think you got more torque than you do.
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Old 06-27-2011, 02:28 PM   #8
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Quote:
Originally Posted by FatChance View Post
Too expensive for a KLR!

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Old 06-27-2011, 02:52 PM   #9
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Quote:
Originally Posted by FatChance View Post
Too expensive for a KLR!




So you're saying we need to rig a squirt gun full of gas with a cable wrapped around the trigger and just squirt it in when we need the oomph?
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Old 06-30-2011, 01:01 PM   #10
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Mikuni TM40 pumper carb kit?

What about something like a Mikuni TM40 pumper? Procycle offers a kit for a DR650?

http://www.procycle.us/bikepages/dr650.html#fuelsystems


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Old 07-01-2011, 08:28 AM   #11
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Yes, that might be the hot ticket.

Or, ................ I don't why anybody with a milling or CNC machine hasn't made an adapter for the CV40 carb that were standard on the HD bikes. Those already have a pumper installed and should be really close to the jetting used on the CVK40 that is the original carb. I wish I had one, I'd do it, but since I don't.......................
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Old 07-01-2011, 10:21 PM   #12
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This issue has been visited on some other forums. The problem is clearance, there is very little above the carb.

I have been looking at the HSR40 which is the pumper replacement for the CVK40 carb meant for Harleys, but hey, it's still a decent pumper carb.

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Old 07-02-2011, 06:48 AM   #13
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A pumper carb should surely improve throttle response on a KLR650; no longer suffering the inconvenient delay while the CV carburetor develops vacuum necessary for lifting the slide and needle . . .

Clearly, an accelerator pump offers an advantage in the motocross, hare scrambles, and flat-track competitions, should KLR650's enter such races.

A pumper doubtless offers competitive edge over the CV-only carbed machines in wheel-to-wheel racing.

Invoking an accelerator pump appears to me a modification justifiable perhaps in competition. Ordinary KLR650 service life spectrum? Not so much, I think, but--YMMV!

Now, if we could simply just bolt on an ex-Harley CV40 . . . why not?
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Old 07-02-2011, 06:50 AM   #14
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Originally Posted by FatChance View Post
Too expensive for a KLR!




what he said
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Old 07-02-2011, 07:24 AM   #15
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Quote:
Originally Posted by danketchpel View Post
This issue has been visited on some other forums. The problem is clearance, there is very little above the carb.

I have been looking at the HSR40 which is the pumper replacement for the CVK40 carb meant for Harleys, but hey, it's still a decent pumper carb.


Details??????????????



Quote:
Originally Posted by XDragRacer View Post
A pumper carb should surely improve throttle response on a KLR650; no longer suffering the inconvenient delay while the CV carburetor develops vacuum necessary for lifting the slide and needle . . .

Clearly, an accelerator pump offers an advantage in the motocross, hare scrambles, and flat-track competitions, should KLR650's enter such races.

A pumper doubtless offers competitive edge over the CV-only carbed machines in wheel-to-wheel racing.

Invoking an accelerator pump appears to me a modification justifiable perhaps in competition. Ordinary KLR650 service life spectrum? Not so much, I think, but--YMMV!

Now, if we could simply just bolt on an ex-Harley CV40 . . . why not?
It's not just a question of racing or competition, it's also a question of drive/rideability. Several things hold back the KLR in the mind of more aggressive riders or riders who do more challenging off road work. One of those things is the instant power to clear obstacles and that power comes from an accelerator pump (among other factors too, of course)

You can't bolt a HD CV40 because the intake is different. The CVK slips onto a rubber boot that is bolted to the cylinder head, the CV bolts directly onto an aluminum Y pipe. I also believe that there are clearance issues as stated above, but I believe those clearance issues are related to the throttle cable wheel.

Besides almost every other bike out there has performance stuff, why not us?
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