|07-02-2011, 07:44 AM||#16|
Joined: Mar 2009
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
|12-11-2012, 08:58 AM||#17|
Joined: Sep 2008
Location: Roanoke Va
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:
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.
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
|04-10-2013, 03:06 PM||#18|
Joined: Mar 2007
Location: Black Hills, West Dakota
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.
|04-10-2013, 03:57 PM||#19|
DualSport Crazy !!
Joined: Jan 2012
Location: Redding, CA
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....
"Where ever you are, there you go..."
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