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RB carb and low end torque
Posted: 12:18 pm Apr 01 2008
by ebeck
I an considering doing an RB carb with the head. I seem to read many people like it but I also read the head does more and is more noticable.
I guess if there is an increase in low end performance then I would do it. Can anyone comment on the low speed lggging performance, grinding up a hill for example. Is there a noticable difference with the carb in that situation or should I just stick with the head.
I am sure there is more top end but I rarely get there so I am more concerned about low end performance. I think I need a KTM300 LOL.
Thanks.
Posted: 07:31 am Apr 02 2008
by KarlP
"Is there a noticable difference with the carb in that situation or should I just stick with the head."
Yes, there is a noticeable difference
Posted: 07:33 am Apr 02 2008
by Indawoods
One Acronym "SSS" .... use it!
Posted: 05:43 pm Apr 02 2008
by ebeck
Hmmm, what is "SSS"? Spelling reference or something?
Posted: 06:22 pm Apr 02 2008
by skipro3
Second Sweet Spot.
Some pipe dream of Carvr's. Humor him and do a search on it. Pretend you found the spot and that you like it. Otherwise, he'll get a rant going....
He thinks that there is a second setting on the air screw that provides a better low to mid rpm performance with the KDX motor on bikes with an RB'd carb.
Posted: 10:14 pm Apr 02 2008
by ebeck
Oh yeah, I noticed that too.
Posted: 05:30 pm Apr 03 2008
by Jeb
'I can only comment on what happens when you install BOTH the head mod AND the carb mod since I did both simultaneously, but the combination is VERY impressive in terms of a generous, definately-feel-it-in-the-pants increase in power across the RPM range. I can remember what the rev pipe did when I installed it and the difference with the mods is of that magnitude.
My bike is a few steps beyond that with some recent changes; race gas head, timing changes, power valve changes have resulted in more aggressive power delivery and more power from mid-range to upper revs. But the biggest power change was the initial RB mods.
Oh yeah . . . I stumbled onto that pipe dream as well
Posted: 12:15 pm Apr 04 2008
by ebeck
OK I am convinced, carb and head it is. I need all the low end, lug up a hill, with out breaking traction power I can get.
Posted: 05:51 pm Apr 04 2008
by skipro3
On my 220 it was the best mod I did. What reeds are you running? VForce3 are great....
Posted: 01:48 pm Apr 07 2008
by ebeck
I have stock reed cage but Boysen carbon fiber dual stage reeds.