Join Date: May 2009
Location: Indiana/ Michigan line at the Lake
[B]Simple REALLY Cheap Upgrade:
Talledega Nites (legend of Ricky Bobby),
My '01 Dyna came with 45/190, '96 Sporster at 42/ 150.
The mains have different threads for the KLR! I didn't mess with the low speed
(which is fine as-is imo.) I got a 150 at Honda and left the 42 in there.
The cylinder size for the EVO engine and KLR is the same, only 20cc difference.
With the twin cam setup on the CV40, I think you are a bit rich, not that is any
problem, plus you said AFR is fine. Your mileage is in the ballpark.
I thought I knew everything CV when I got here from my HD experience and learned
otherwise. These waterheads are fine leaner than HD, but richer than stock. Nearly
everyone who mods their carbs here just does the #4 ss or brass washers (2), and
turns out the mixture screw 2 1/2 to 3 turns from gently seated. The cut spring
and larger hole can make the slide go up too fast. You'll be on the main too soon
and run rich during acceleration.
The sponge element flows fine, and most dudes don't like the K7N unit. The KLR
problem is the restrictive airbox. Remove the rubber snorkel. Some, me included,
drilled holes in the top of the box in an "L" shape known as the L-mod here. I did
5 1/2" holes along with the snorkel. Some do 1" holes that can be reversed with
1" plugs if they don't like it. My bike woke right up and I haven't tried the K&N, nor
an aftermarket muffler. Cored my stock baffle instead for a nice bark yet it's neighbor-
friendly at steady cruise and idle. I get 50 mpg and spent about 4 dollars on my mods.
Including the pcv valve added to the crankcase breather line, the cost went up another
$4.99. If ya take a look on the right side of the carb where the cables attach, now
there's a stopper that prevents the butterfly from going past 80 degrees. It won't
open the full 90. I still don't know what to make of that, but it's gotta be hurting top speed.
I bent the tab out of the way and it ran like CRAP at WOT. Came up with a new
stopper that won't let the 'fly go too far, but goes further than before, and I went from
the stock 142.5 to a 150 main.
The Dynojet kits and Thunderslide recommend drilling the slider but I never have done
it, nor ever clipped a coil winding. I think the extra turbulence helps with the mixing
Sounds like you know what you are doing, and welcome to the site. Don't be afraid
to learn new tricks here. I hadda eat some crow. Thought I'd come in here as a
teacher, but am an apprentice. Some of the guys here have been working on KLR's since
they came out in 1987. I've been working on them since 2009 and have had
to relearn the art of mixing. The spark advance is more aggressive than HD's too.
Probably attributed to the waterhead once again. These babies don't go over 190,
where we had to try HARD to stay under 250 in the past and were really taxing our oil.
Once again, enjoy the site and welcome aboard!