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Old 01-20-2012, 08:11 PM   #1
MuscleGarunt OP
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XR650L carburetor options?

I'm looking for a drop in replacement or kit that uses the stock airbox and intake manifold. I am aware of the XRs Only Mikuni kit which is a pumper for 450 or so and the Sudco Keihin FCR41 kit which is 550. Are there any cheaper options? I don't need an accelerator pump. Does anyone make a kit for the XR650L with a round or flatslide non pumper slide carb in the 200 to 300 range? Google has turned up nothing.
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Old 01-20-2012, 08:46 PM   #2
PistonPants
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Why not modify or jet kit the stock CV? Good bang for the buck. De-snorkel the air box, massage the stock carb, good to go.

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Old 01-20-2012, 09:43 PM   #3
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I did that, drilled the slide, dynojet kit, 58 pilot jet, desnorkel, baffle removed from exhaust. it made a huge difference. The only thing is low RPM performance is really crappy with a CV carb and only one lung.
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Old 01-20-2012, 09:45 PM   #4
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Use a XR650r carb
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Old 01-20-2012, 09:58 PM   #5
MuscleGarunt OP
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Does it fit right in with no modification or adapters? If so that sounds like the ticket!
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Old 01-21-2012, 05:32 AM   #6
mcma111
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Quote:
Originally Posted by MuscleGarunt View Post
Does it fit right in with no modification or adapters? If so that sounds like the ticket!


Yes it does. Here is what you need to do to the jetting:

Jetting for the XR carb is 65s slow/pilot and 165 main and a HRC needle on the second slot from the top
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BMW's
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79 R100s
91 R100gs

87 Harley FXRS-SP ~ 06 KTM 625 SMC ~ 72 Honda CB750/915cc ~ 92 XR600/654cc ~ 95 XR650l/675cc ~ 03 CRF450r ~ 05 CRF450x ~ 02 XR650l/675cc ~ 86 YZ490 ~ 93 YZ80 ~ 93 XR650l Project
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Old 01-21-2012, 08:24 AM   #7
rufus
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Quote:
Originally Posted by mcma111 View Post
Use a XR650r carb

I did that.

Lots better throttle response at low rpm. Smoother, easier starting. But from 1/3 throttle on up it seemed slower and flatter than with the stock CV. I changed jets about 50 times (realistically...20) and never got it to run as good as the CV does at road speeds.

I switched carbs back to back and finally went back to the stock CV.
But IT sucks.
I have an FCR on order from sudco. If that satisfies me then i will get the do 2nd and 5th gear mod.
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Old 01-21-2012, 08:27 AM   #8
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Quote:
Originally Posted by MuscleGarunt View Post
I'm looking for a drop in replacement or kit that uses the stock airbox and intake manifold. I am aware of the XRs Only Mikuni kit which is a pumper for 450 or so and the Sudco Keihin FCR41 kit which is 550. Are there any cheaper options? I don't need an accelerator pump. Does anyone make a kit for the XR650L with a round or flatslide non pumper slide carb in the 200 to 300 range? Google has turned up nothing.


I looked for ,but never found, an XR 600 carb. It should fit right in. My 650L has never run as good as the 600 I had.
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Old 01-21-2012, 10:48 AM   #9
Wattner
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I used a Mikuni flat slide non-pumer for years.... I bet Sudco still has the parts to get it for you!

IMO, they work better than the stock CV, but nowhere near a pumper... KeiHin is the best!
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Old 01-21-2012, 11:28 AM   #10
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Quote:
Originally Posted by Wattner View Post
I used a Mikuni flat slide non-pumer for years.... I bet Sudco still has the parts to get it for you!
IMO, they work better than the stock CV, but nowhere near a pumper
+1, I wore one completely out, then got another. xrsonly does them for an xr600 replacement carb, but they'll do you one to fit an L
It won't be enough carb for the 728 though, nor my TM40.
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Old 01-21-2012, 05:59 PM   #11
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Originally Posted by mcma111 View Post
Yes it does. Here is what you need to do to the jetting:

Jetting for the XR carb is 65s slow/pilot and 165 main and a HRC needle on the second slot from the top
Thanks for all the replies! Great information from everyone.

Is the HRC needle something I will need to order?
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Old 01-21-2012, 06:04 PM   #12
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How about this carburetor? Or would the stock XR650R carb work better?

http://www.ebay.com/itm/Mikuni-TM40-...ht_2808wt_1000
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Old 01-21-2012, 09:43 PM   #13
darenative
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With the R carb, your stock throttle cables need to be modified or you can purchase an R carb with throttle assembly.

I'm in the middle of the swap so I'm not a wealth of information, but the few times I've ridden the bike with the R carb, I could tell low end throttle response is hands down better the the cv carb....
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Old 01-21-2012, 10:15 PM   #14
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So assuming I get the Mikuni TM 40 can I go with my current jet sizes from my CV carb? Everything I am reading is talking about smaller jets in this carb for same motor? Anybody done this before?
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Old 01-23-2012, 08:02 PM   #15
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Anyone done a TM 40? I'm about to take the plunge and be the first here pretty soon or one of the few anyway.
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