Carb Mod - Kawasaki KLR 650 Forum
2008+ KLR650 Wrenching & Mod Questions For repair, maintaining or modifying discussions related to the newly updated 2008 and beyond, Generation 2 KLR650 Motorcycle.

 
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post #1 of 6 Old 08-26-2010, 02:33 PM Thread Starter
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Carb Mod

Any thoughts on the following:


First the low end idle circut.

I looked at my carb. The low mixcure screw faces down at the block from the carb. This makes it impossible to adjust even with a screw driver, you can't get at it. That of course is if your carb is like my 94.

Pretty easy fix really. Just loosen the carb at the intake boot and air box boot. Turn the carb side ways so you can see the jet in the carb. There might be a soft plug blocking it....drill it out, comes out easy.
Then turn the mixture screw all the way in counting how many turns "in".
Now remove the low set jet. Get a 3 cent screw that will thread into the jet screw hole. About a 1 inch long. Take a grinder and grind the end of the screw so the it has a flat tip blade, like the end of a screw driver. Make sure it fits in the end of the jet screw.

Now buy a rubber vac. plug that will fit snug over the end of the screw. This will make it easier to turn with you fingers.
Now screw the jet screw back into the carb until the jet screw is flush with the carb body. Now take the screw with the rubber plug and screw the The jet screw in with the screw. This will keep the jet screw and screw mated as you turn them in. Screw them in until the jet screw seats. Now turn the jet out the turns you counted before you remove it. You are now good to go. You can adjust the jet screw at any time with your fingers.

This really easier than it reads here. Takes about 30 mins to do.

Now the high speed jet:

This is just as easy. Some motors have a hole allready drilled in the intake just before the intake boot and is plug with a screw OR it has a tube with a vac. plug on it. Remove the plug or screw. With a tube just connect piece of vac. tube to it about 1 foot long. Connect the vac. tube to a small valve and mount it some where you get to it easy even while riding. Again your done and ready to rock and roll.

You can buy the screw, vac plug at Ace Hardware. About 10 cents
You can get a fuel adjustment valve at RC Counrty, but instead of letting fuel in your just adding more air.. About 10.00 if that.

As I said before about 30-1 hour to do with everything in hand.
But it will work real well and better than this cheap set in this post. Also you would get two adjustments instead of one.

HERE TO RIDE
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post #2 of 6 Old 08-28-2010, 09:02 PM
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Sean,
This is just the rev. of the dail a jet set up.
Myself I would prefer have the main jet a little fat and then lean it by adding a bit more air. If you for get to fatten the carb on a lean jet you could burn the motor. Dail a Jet requirs you put a leaner jet in the high side and then add fuel.
This is as i said in SCR.

Also the mod the way I suggested wont work for the newer bikes. Both set up's will work on the old one"s though.

After playing with this this week end I was able to make a mod set up for the low speed idle mixure. Now I can lean the idle mixure so the bike runs better the higher I go in alt. I can now adjust it with my fingers with the bike running.
I have to pick up a valve to do the high side.

Kurt

Mind over Matter:
If you don't mind, then it don't matter!

Def. of a man:
We spend 9 months trying to get out and the rest of our lifes trying to get back in!\
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post #3 of 6 Old 08-29-2010, 09:36 AM Thread Starter
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Kurt

Get in touch when your foot is 100% - can't wait too back into the mud this winter.

I'm going back to Patterson in the fall - mid October - if you're good by then.

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post #4 of 6 Old 08-30-2010, 10:44 AM
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I'm new and have no clue as to what mod your referring to, but want to start learning as much as I can.

How easy is it to blow the engine with out this sort of mod. I like running my 2001 at 85-90 for 15-20 minutes. Am I in danger of blowing this bike up with out a carb. Mod. The bike just crossed 7500 miles
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post #5 of 6 Old 08-30-2010, 11:39 AM
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Quote:
Originally Posted by flibida View Post
Am I in danger of blowing this bike up with out a carb. Mod. The bike just crossed 7500 miles
There's no rev limiter on your bike.. Just remember that and you're good..

I have no carb mods on my bike, and at 21,000 miles, it's running the same as it did when I bought it with 1200 miles on it.

I occasioally run at steady Interstate speeds for hours at a time, too..
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post #6 of 6 Old 08-30-2010, 07:58 PM
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Quote:
Originally Posted by flibida View Post
I'm new and have no clue as to what mod your referring to, but want to start learning as much as I can.

How easy is it to blow the engine with out this sort of mod. I like running my 2001 at 85-90 for 15-20 minutes. Am I in danger of blowing this bike up with out a carb. Mod. The bike just crossed 7500 miles
The carb mod Sean and I are talking about is not so much for speed but power at high Alt's.

Sean runs a lot of routes high up in the mountain at high alt. and the bike looses alot of power when it is not jetted for that alt.

We are talking about doing a mod that will allow a rider to reach down while ride and lean the bike out. The higher the alt. the richer it runs.

Kurt

Mind over Matter:
If you don't mind, then it don't matter!

Def. of a man:
We spend 9 months trying to get out and the rest of our lifes trying to get back in!\
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