for the folks who use a mikuni tm flatslide carb

8 replies to this topic
  • honda500

Posted May 29, 2005 - 12:12 PM


i have a tm34 mikuni flatslide carb on the way and i wanna know if i need a fuel pump or not. anybody here have a tm carb with or without a fuel pump

  • XR250rdr

Posted May 29, 2005 - 03:53 PM


I've never heard of having a fuel pump on a dirt bike.

  • honda500

Posted May 30, 2005 - 07:41 AM


it's an aftermarket carb not stock

  • don87xr600

Posted May 30, 2005 - 12:48 PM


where would one buy a fuel pump for a dirt bike?

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  • BWB63

Posted May 30, 2005 - 03:33 PM


The fuel pump is part of a pumper Carburetor. It pumps fuel (squirts) to make the engine respond faster. Edelbrock, Mikuni and FCR Kehin carburetors are pumper carbs. A TM40 is a Mikuni pumper carburetor, I have one for my XR650R. I had a 36mm TM36 Mikuni on a 84 XR500 and it rimped compared to stock setup. Had a 38mm pumper on a 94' XR600R. I have a Edelbrock 40mm X 42mm pumper on my 680cc XR650R. I don't think you need a fuel pump as in "To pump fuel out of the fuel tank". But, a carburetor with a fuel pump meaning, "a pumper carburetor" it's the type of carburetor that is being talked about. Three major carburetors, talk about here; Round slide that just draws the fuel through the jets with vacuum (stock XR650R has this) has a lag time off idle if you wack the throttle. CV (Constant Volocity) uses Vacuum to pick up the slide, (what the XR650L uses) it's a good street carburetor but, sucks for real dirt riding. Then you have the pumper carburetors, has a fuel pump that squirts fuel to over come lag time. Very responsive once tuned right. They come Flat slide and round slide. TM Mikuni's are pupmer carburetors.

  • honda500

Posted May 31, 2005 - 02:37 AM


the reason i ask is because on the dennis kirk mag, they say that the tm carbs are to be used with a fuel pump for instance with a snowmobile. but the seller said he just bolted it on. i just wanted to know if he was just trying to sell it or not.

  • jbird710

Posted April 22, 2006 - 01:45 PM


I know it's nearly a year since the original posting but look at the string:

http://www.thumperta...rburetor XR650L

You can put an electric gas pump on a 650L to overcome fuel delivery issues. It would seem to be overkill but it obviously worked for the guy in the string above.

  • rcnutt

Posted April 22, 2006 - 03:33 PM


G-R-A-V-I-T-Y fills the bowl.a sleds tank will sit low and might need a pump to get gas up to the carb.........never need one on a dirt bike unless there is blockage in the line

  • BWB63

Posted April 22, 2006 - 11:28 PM


Some fuel tank need a fuel pump to pump fuel from one side to the other but, this is not about a mikuni, just might be where the confusion is coming from???

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