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KTM Carb question for SM tuners..
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KTM Carb question for SM tuners.. - September 6, 2007, 10:54 AM

Hola,

I could some help from you SM tuners....

I recently swapped my BST40 carb outta my KTM SXC for the FCR41.. The change in throttle response is scary - if I am not careful the front feels very light on power takeoffs and the 1/2 shift... I don't have any flat spots and it feels great - on acceleration anyway... My issue is with rolloffs.. If you aren't gentle when rolling off the throttle - it's allot like hitting the brakes if you do it too quickly...

I experienced some of this when I put a FCR39 in my DRZ - so I know is this is indicative of a flatslide with as accel pump.. It was easier to deal with on the drz - but that's was a 400 and this is a 625.. It seemed a little bit better when I pulled the snorkel (I have since ordered the KTM Racing airbox cover). I am trying to get a feel for it (FCR's quirks), and how normal it is before I attempt to start playing with needle position and jets. The carb came from a person I respect and it was on another SXC with the exact same config..

THoughts/Opinions


-Jason
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September 6, 2007, 11:04 AM

Yep had the same thing with the Duke. Was so bad that I installed a slipper clutch. Which then killed the motor cause of how hot it got the clutch basket and oil! I tried to tune it out but gave up and just dealt with it.


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September 6, 2007, 11:07 AM

All I know is that carb makes all the D2 riders smile.
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September 6, 2007, 12:16 PM

Thanks guys....


I figured it might be the case... It's not necessarily a bad thing, I can modifiy my riding to style to accomodate it .... Dodge - anyway to get a slipper in the bike without it killing it.... I can see where hard downshift could be brutal...

It's trully evil now.. High Flow Head, FCR, NO Emission stuff, no oil in the frame... As the 625's go - it's probably one of the lightest, and higher HP producing Tards out there. Only drawback was I had to put the 18L tank on it for street usage... 75-85 miles to a 9L tank SUCKED.. I will still put a 9l on for the track (maybe), right now I like the extra fuel weight to keep the front on the ground...

Thanks again




-Jason
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September 6, 2007, 12:27 PM

Yea go with the KTM anti-hopping clutch. I used a STM and it was great until. I know how to keep it from roasting the clutch cush drive but as for oil changes you would have to change it every 2000 miles. The KTM one is 1 grand and I got the STm for 540.00. Eh lesson learned!


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September 6, 2007, 12:29 PM

I'd live with it.

I do miss those wheelies out of every turn.
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September 6, 2007, 12:32 PM

Quote:
Originally Posted by nunyadambusiness
I'd live with it.

I do miss those wheelies out of every turn.
Get a KTM 690SM! The wheelies are calling you!!! Or a Duke III next year!


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September 6, 2007, 12:37 PM

Quote:
Originally Posted by dodge131
Get a KTM 690SM! The wheelies are calling you!!! Or a Duke III next year!
http://www.reelwavs.com/movies/office_space/ohface.wav
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September 6, 2007, 12:52 PM

Quote:
Originally Posted by dodge131
Get a KTM 690SM! The wheelies are calling you!!! Or a Duke III next year!
SMR690.. Next year babeeeeee


-Jason
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September 6, 2007, 01:01 PM

Quote:
Originally Posted by nunyadambusiness
I'd live with it.

I do miss those wheelies out of every turn.
the shifts are a tad harsh now with the extra ooomph.... I am sure I can deal with it... but if I start trying to back her in vs sportsbike style.. I might go the slipper route... I will probably jsut deal with it for now.....

My extra $ might be tied up in a purchase of a 620 Adv ESG - low pipe model....

I have gone KTM nutz..... a year ago - 3 jap bikes.... soon to be 3 ktm's


-Jason
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September 6, 2007, 01:03 PM

I've had a couple run through shop with the same carb on it. There really isn't a way to "tune" it out from what I've seen and heard. I did put slightly smaller jets in one but that helped about as much as pulling the snorkle. Just ride it like you would a twin and expect the heavy engine brake.


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September 6, 2007, 02:43 PM

Quote:
Originally Posted by nunyadambusiness
All I know is that carb makes all the D2 riders smile.
you mean like this one - http://cgi.ebay.com/ebaymotors/2002-...QQcmdZViewItem


-Jason
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