Idle mixture - Kawasaki KLR 650 Forum
1987 to 2007 Wrenching & Mods For maintaining, repair or modifications of Generation 1 KLR's. 2007 and earlier.

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post #1 of 47 Old 02-16-2018, 02:55 PM Thread Starter
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Idle mixture

Gents,....I'd like to hear from people that have "external" (for the lack of better word) idle mixture screw. I kinda like the idea of being able to reach under the carb, and turn the knob by hand, instead of tilting the carb, or fiddling with a short screwdriver in order to adjust it.

Mine is still capped, and it hasn't been touched. I am not sure how important it is to adjust it periodically, and I am concerned about the thing getting packed with dirt, and whatnot.

Now that I have the carb in pieces, it would be the right time to install this thing. What are your experiences with it?
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post #2 of 47 Old 02-16-2018, 04:18 PM
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Talking about the fuel mixture screw right? http://www.klrforum.com/1987-2007-wr...valuation.html


I'm in the "I don't mess with it once I've set it so don't see the need" camp! :-)

Dave
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post #3 of 47 Old 02-16-2018, 05:07 PM Thread Starter
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Would HD Sportster mixture screw fit? (it's almost half price!)
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post #4 of 47 Old 02-16-2018, 06:14 PM
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Unless you're performing lots of (as in, obsessive-compulsive) IDLE mixture adjustment, the fuel screw remains pretty much a, "set it and forget it" component, in my experience.

If you're traveling regularly from Death Valley to the Pike's Peak summit, and experience difficulty starting and idling with elevation changes, easy idle mixture adjustment might be worthwhile.

The fuel screw dominates mixture only from idle to slightly above. If worth it to you, the screw for the Harley CV40 ought to fit the Kawasaki CVK40; be careful of all the little co-axially-mounted goodies prone to loss when you remove and replace the fuel screw (shown, I think, in the Carb Overhaul thread).

Oh, yes; EXPERIENCE. I have a Kouba (yeah, they make LINKS, too) T-handled fuel screw (installed on my KLF300 (ATV) CVK32; adjusted it ONCE, IIRC.

Last edited by Damocles; 02-16-2018 at 06:24 PM.
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post #5 of 47 Old 02-16-2018, 06:21 PM
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Is the Sportster screw extended, about 5/8 - 3/4 inch? Probably work.

Some owners have drilled a hole in the center of the screw head and soldered a bent wire into the existing mixture screw.

pdwestman
Modify at "YOUR OWN RISK"!

Still riding my 1987 KL650-A1. 84,000+ miles & counting
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post #6 of 47 Old 02-16-2018, 08:07 PM Thread Starter
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Well,......if you guys didn't figure it out yet,...it's time for me to come clean. I am OCD,.....but I think in a good way. My wife (jokingly) says that whoever "created" me, was making me gay, and at the very last moment, changed his mind. Because,.....I am very clean, organized, I love classical music, arts, I am extremely conscious about my looks (I work out daily, and have sixpack at my age), wardrobe......you get the picture. And yet,.....I can't live without women! Sometimes she says it was a "crime" for me to be introduced to military, because THAT just exacerbated my natural disposition (sickness).

Like I said before,......I live above 4000', I will ride this thing from there up (sometimes over 8000'), AND I am planning a sailboat trip to the Med, AND the KLR will go with me. I WILL need to adjust that screw periodically (4-5 times with one of them possibly on the boat, or in the Monaco marina, with parts hard to find). My thinking is,......screw the damn thing in, and adjust the mix whenever/wherever the bike might need it. But,.......

Knowing me as well as I do,....I doubt this bike will ever be dirty (except for a short time on the mountain), but I would not like this to get packed with dirt/grime. That's why I was asking this question from the gurus. AFA HD screw,...don't get me wrong, 35 bucks is nothing for me, but I see the same crap for 16 bucks, and I might be "sick", "OCD", "anal", etc. but I refuse to be taken for a sucker. I did not get here where I am in my life, by being a sucker. Anotherwords,....it's not about the money, it's the principle.

I also LIKE to wrench (it relaxes me), but I don't like to wrench more than necessary. So while this thing is in pieces, I might as well do whatever I think of doing to this carb. Once I put it back in, I'll never take it off again (I am pretty sure rubber boots will outlive me). It'll be either .22, or KLX,.... AND "enricher" plunger, plus the idle mix screw. I'll also drill 1" holes in the side of the airbox (dirty side of course), and go to UNI.

Now,.....I could spend some time to do more reading, but,.....since you are ALL so generous with your knowledge, I'll ask here:

What would you recommend in terms of jetting (all jets!) for the intentional use of this bike? And remember,...no racing, no "wild" stuff, no sprocket changes, and no changes once set up. It needs to work like a Rolex (NOW that's a stretch I know!) at the sea level, and up to, let's say 8500' without taking the carb out, and without screwdriver.

Thank you.
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post #7 of 47 Old 02-16-2018, 09:37 PM
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2 turns open on the idle mixture screw, 11 cent shim on the mid-range needle, 145 main jet.

Do Not Drill holes on the Side of the dirty air box, drill them on the top!

Retain your oem foam air filter, unless splitting at the seams and rotate as needed with the Uni-Filter.

pdwestman
Modify at "YOUR OWN RISK"!

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post #8 of 47 Old 02-16-2018, 10:12 PM Thread Starter
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Quote:
Originally Posted by pdwestman View Post
2 turns open on the idle mixture screw, 11 cent shim on the mid-range needle, 145 main jet.

Do Not Drill holes on the Side of the dirty air box, drill them on the top!

Retain your oem foam air filter, unless splitting at the seams and rotate as needed with the Uni-Filter.
Thank you. OEM filter is like new. I assume you mean "complete .11 mod" with 7/64 hole?
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post #9 of 47 Old 02-16-2018, 11:28 PM
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Your CV carburetor compensates automatically for elevation changes within the range you mention, Danielsand (see, the less-dense air at altitude produces less Bernoulli-effect vacuum, drawing less fuel through the . . . oh, never mind! )! But, from your personality profile, you'll never be satisfied with this automatic phenomenon, and you will continue "optimizing" the fuel-screw setting (even though you're not affecting more than about 1/8" throttle escalation). You probably will profit from an easily-adjustable fuel screw (the Kouba T-handle would be my preference, its setting position always visible, easily torqued in either direction).

While the 145 main jet is usually employed with the KLX needle (vs. the OEM needle), pdwestman's recommendation must be resepected, from his experience.

Don't know why you need "another enricher plunger." While you vow never to take your carburetor off again, keep, "Carb Overhaul" URL handy, just in case. Enricher plunger can be removed and replaced without carb removal, anyway (as can performance of the complete 22-cent/11-cent mod, even main jet replacement, simply rotate the carb).

The $ 16 fuel screw vs. the $ 35 fuel screw decision is harder to game; the cheaper product likely is made-in-China with attendant quality control, design and workmanship consequences . . . you may not simply be a sap for paying more for a quality component, especially one as critical as the fuel screw. However, if the notion you've cleverly shopped and bagged a bargain appears vastly more important to you, go for it!

So, you plan to tune your carburetor while afloat in the Mediterranean Ocean? While moored at the Monaco marina? (You ain't CATFISHING us, are you, man? ) Must be a mighty big sailboat upon which you sail!

Your call on drilling the slide hole (vacuum port); you're unlikely to botch the job, given your fastidious nature and love of "wrenching." Especially since you'll doubtless chamfer both sides of the hole . . .

Your decision NOT to change sprockets must be respected; however . . . many riders engaged in the service life you postulate go up a tooth on the countershaft sprocket.

Post a picture of your ride, once you've farkled it to your taste! (Please share a snapshot of you and your KLR650 at Monaco's Casino de Monte Carlo (q.v., James Bond's, "Never Say Never Again") when you visit there.)


Last edited by Damocles; 02-17-2018 at 06:13 AM.
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post #10 of 47 Old 02-17-2018, 08:33 AM Thread Starter
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I lived in Monaco for two years. On and off for 31 years in Europe (15 with my parents who were both in the military, and the rest on my own, courtesy of Uncle Sam).

As far as the boat,........my wife grew up on 75' yacht in Dana Point. She is a sailing instructor (hobby). I can't sail worth of crap, but I am an EXCELLENT navigator. We sold 45' power boat that was moored in Newport Beach, back in 2011. Bought 140 acre horse ranch, and rescued horses. Then we sold that,purchased 45' Prevost, and moved to Idaho, and bought 40 acre ranch. After we purchased the ranch, we sold Prevost (not needed any more).

We still have four horses left. They are all rescued, and older. They won't last 2-3 years max, at which point we will sell Idaho property, purchase a 45' Ketch (a family member has it now, waiting for us to take over when we are ready), and sail it to Europe. My wife was stationed in Turkey for 5 years, and is of Irish/Greek descent (wants to spend at least 6-8 months in each country, which rules out "vacationing" for a week or two). I am of German/Croatian descent, and I want to spend about the same time in Adriatic (Croatia and Montenegro). I lived over there before. Buying properties, and moving on, is not cost effective. So,....with her background in sailing, we decided to live on the boat for a while (as we did on land in Prevost), until we find the place where we want to die.

She is ready to retire in couple of years,.....and that's it. I retired from US in 1995. Owned several business until 2015, and fully retired since.

As far as "enricher",......I am about to install the choke plunger (I call this thing a "choke" my whole life, but was corrected on this site to refer to it as "enricher"!). Turning the carb sideways is hindered by the original set up, and since I hated how cheap/plasticky it was , I just cut it off. Carb is out now, and I want to do to it everything that I think I might need. Like I said before,....I don't need more power, I don't do whilies/stoppies either. I just want it to run like a Swiss watch (thumper style), at any elevation I might find myself at. We are planning at least a year (from the start) to get to the Med. Haven't decided yet if we will sail from CA (where the boat is now), or transport the boat to the East Coast, and sail from there (shortening the trip considerably). Not too keen on Caribbean (pirates), and goofy gun laws that pretty much leave you defenseless.

In any case,.....there will be MANY ports we will be stopping at on the way, and KLR will be unloaded on the dock for grocery shopping, sightseeing, etc. That's why I was asking about the idle mixture screw, thinking that it would be much easier to manipulate (if needed) on the go. If CVK40 compensates for my range in elevation, than I don't need to do anything else. Once (in any given location), I have enough power, no backfire, smooth idle, and snappy throttle, I will not screw with it, despite my OCD. Everything I own "has to" be perfect, and in perfect running condition,....just the way I am.

When we are on the way, I will definitely post pictures from different ports, if I'm still a member here. If I'm not,...I'll have a blog on the web under the same moniker (easily found). I don't have a blog now, and I don't do ANY "social media".

And that's that.

P.S. the pic in your post is Monte Carlo (casino), and a lot of people mix the two (Monaco/Monte Carlo). Monaco is the country, Monte Carlo is just a casino. I love Monaco, but I don't gamble. I had to post this for the ones that don't know, and don't care to search.

Last edited by Danielsand; 02-17-2018 at 08:42 AM.
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