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Old 11-20-2008, 04:21 PM   #16
ADVJake
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Quote:
Originally Posted by LukasM
Just a thought, but has anybody looked into fitting an FCR off another bike? The big KTM EXCs come with a 41mm Keihin as far as I know.
The FCR doesnt fit the XRs too well, the tank has to be heat treated to make room for the throttle wheel
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Old 12-02-2008, 01:17 PM   #17
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Doscer been away upcountry working but home for a week now.
You'll have to swap out every thing that comes in the xr650 TM40 kit jet and needle wise it's absolutely nowhere near where you want it.
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Old 12-02-2008, 01:51 PM   #18
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My .02

My XR came with a TM40 that would bog horribly at anything more than half throttle. It was really, really hard to ride the bike that way. I tried everything I could think of – jets, needles, adjusting the fuel shot – to get it set up right and nothing worked. I finally bought a used stock carb and set it up for the bike: 100 percent improvement.

So my personal experience is that the TM40 is probably a great carb if you can get it set up, but there are so many variables that you'd better be good at carb tuning, and have a lot of patience, or forget it.

Which reminds me: I need to get that TM40 listed in the flea market.
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Old 12-02-2008, 01:58 PM   #19
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The TM is a lot of work to set up but once it's done it's like fuel injection.
Hey nice sales pitch by the way.
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Old 12-02-2008, 03:13 PM   #20
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Quote:
Originally Posted by badcooky
The TM is a lot of work to set up but once it's done it's like fuel injection.
Hey nice sales pitch by the way.
That's why I only lasted one day as a door-to-door vacuum cleaner salesman.
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Old 12-02-2008, 05:27 PM   #21
ADVJake
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i got my tm40 on the way
sounds like they are a bitch to tune, maybe i should get a tuner to do it.
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Old 12-02-2008, 06:21 PM   #22
JustinT
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Quote:
Originally Posted by ADVJake
i got my tm40 on the way
sounds like they are a bitch to tune, maybe i should get a tuner to do it.
THey aren't that bad...just hunt down some starting jet settings give it a stab. You can get it to run well with little effort if you know where to start...then you just ride it, identify the symptoms of lean or rich and where they are in the throttle position and adjust accordingly, usually only a size or two is required!

At least try it...or let the tuner show you...so if you travel somewhere with different climate/alt you can make the changes yourself. Anything you learn on it will apply to all future carburetors!
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Old 12-02-2008, 06:32 PM   #23
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There's only one way to learn eh.
I can help with set up and there's a guy i know on TT who is stateside so and knows his stuff.
I think i've got my settings on here somewhere so check out mine and go a wee bit leaner as mines got a bit done to err.
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Old 12-02-2008, 06:36 PM   #24
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My .02

2005, opened exhaust but left in the screen, airbox has the plugs out but

no extra holes.

I jetted per Borynacks page.

Mine has instant throttle response RIGHT NOW!! Zero hesitation.

With stock gearing it wheelies off the throttle in third, and according to a GS

rider I was pacing, we hit a GPS verified 105 mph.

YMMV, Buyer Beware, IMHO, Yada Yada.
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Old 12-02-2008, 06:40 PM   #25
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That's the spirit.
Our Bruce knows his stuff.
So you are 25ish pilot,Y-4,9jy something and a 1.2 air screw and 140 or so main?.
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Old 12-03-2008, 12:31 AM   #26
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I've installed a few TM40s on BRPs and find thier performance to be excellent. I live at sea level in California and I'd be happy to dig out my notes on jetting if you think they would apply to your altitude. I would also have to agree with the other post, I don't know what they are thinking with regards to the jets that ship with the carb. I think I may have mentioned this in an earlier post, but I think you'll find tuning your carb easier if you disconnect the pump. I also like to mark the throttle grip with a pen to indicate 1/4, 1/2, 3/4, and WOT. It's a silly little gimmick but it helps.
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Old 12-03-2008, 04:49 AM   #27
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Quote:
Originally Posted by XRider
I've installed a few TM40s on BRPs and find thier performance to be excellent. I live at sea level in California and I'd be happy to dig out my notes on jetting if you think they would apply to your altitude. I would also have to agree with the other post, I don't know what they are thinking with regards to the jets that ship with the carb. I think I may have mentioned this in an earlier post, but I think you'll find tuning your carb easier if you disconnect the pump. I also like to mark the throttle grip with a pen to indicate 1/4, 1/2, 3/4, and WOT. It's a silly little gimmick but it helps.
I wouldn't mind seeing your notes on jetting. I may give the TM another go and I live at sea level. Thanks.
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Old 12-03-2008, 05:39 AM   #28
B.Curvin
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Quote:
Originally Posted by badcooky
That's the spirit.
Our Bruce knows his stuff.
So you are 25ish pilot,Y-4,9jy something and a 1.2 air screw and 140 or so main?.
Honestly, I have no idea. I know I have the 68s slow jet (or was it 63 )

I set it up in 2005 and haven't messed with it since.
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Old 12-03-2008, 06:29 AM   #29
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Quote:
Originally Posted by Scribe
I wouldn't mind seeing your notes on jetting. I may give the TM another go and I live at sea level. Thanks.
Me too.
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Old 12-03-2008, 01:32 PM   #30
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Mango if you have a 68 pilot we are talking about 2 different carbs as you have the stock carb,we are talking about the TM40 pumper carb.
The stocker bogs when you whack the throttle it also bogs over stutters so don't hand me that stuff about it being perfect.
With the stock carb the bike is a pain .
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