Too JET or NOT to JET? - 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 10 Old 10-06-2006, 07:45 PM Thread Starter
Join Date: Oct 2006
Posts: 14
Too JET or NOT to JET?

I am wondering if I should jet the carb, with a Dynojet after reading some different forums. It is for the KLR, and I am planning on keeping the stock pipe for a while. I was thinking go with the stage 1, but, I don't care; stage 2, if it is better I will do it. Anyway I am reading that it gives everything from a slight increase in HP, and some say it adds NO power, and only wastes gas with the stock pipe. I trust the patmans nice write up with regard to doing the carb mod and an aftermarket exhaust, so, the real Question is? Should I just hold off on it until I get a better pipe?

Thanx for any input.
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post #2 of 10 Old 10-06-2006, 08:27 PM
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I just did the drill and adjust, and shim on mine. I wouldn't bother with the shim thing. Just drill the plug, pop it out and adjust the mixture.
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post #3 of 10 Old 10-06-2006, 11:00 PM
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I have both now. (or have done)

I bought mine, used. with a dynojet, and supertrap on it. I was having running problems and mpg problems. the problems stemmed from not being set up right.

I have since gone back to stock 100%. then modified everything the way I have learned from these forums. I think you should shim, and adjust mixture now. dont wait or add a aftermarket exhaust. I dont think adding one will give you mpg problems, as long as you follow advise closely about jetting. You will have problems with mpg's if not done correctly. I was down to about 30 mpg at one time.

However, I also know that adding exhaust does really add alot of performance to the bike. it is lighter tho. I hated the loudness of the supertrap. I love the stock for noise.

I now am shimmed two washers. unifilter, 2.5 turns out. It runs great and all my mpg problems are fixed. making these changes will not effect you mpgs alot, maybee 2mpg.

hope it helps. remember you will get about four other varieties of advice. you decide, and be ready to play with it. its a science you have to stumble upon. all bikes are different!!

have fun!!!

Steve - Tazmanian Devil
00 KLR
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post #4 of 10 Old 10-06-2006, 11:41 PM
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Had a miss between 3-4K RPM with the stock setup. Decided to play with the carb. Drilled the airbox. Put a one size larger pilot jet. Got a Harley externally adjustable air screw. (They use a similar carb on some of their bikes) Played with the main. Went back to stock main. Shimmed the needle (started with one and then progressed) with three Radio Shack washers to somewhere between 0.060 and 0.075. "Seems" a little crisper in the midrange. Idles better. Mileage stayed around 50. Was a fun excersize (I can't spell), but not worth really worth the effort. Best thing I did was drop to a 14T countershaft sprocket. Much more fun to ride and only dropped a mile or so per gallon, even with a lot of hi-way miles. Engine really smooths out between 5-5.5K RPM.

I'm planning an aftermarket exhaust, just to lose some weight. Will be another fun excersize.

I'd leave all as well, if it's running OK. If you don't mind the wrenchin, then give some mods a shot. You can always go back. Just be methodical, in order to note the changes...........Randy
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post #5 of 10 Old 10-08-2006, 09:42 AM Thread Starter
Join Date: Oct 2006
Posts: 14
Thanx for all the info. I think I will start with baby steps and just shim the needle. Eventually I will try drilling the slide and when I decide to plunk down the bucks for a new pipe, then I will do the DYNO. I already have the kit. I bought the (thumb) air adjust screw from Arrowhead, also have a 14 tooth sprocket, I will be installing this week. Going to be a busy week installing stuff. Maybe I will take some pics and do a write up on my opinions of the upgrades.
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post #6 of 10 Old 10-09-2006, 10:57 AM
Join Date: Sep 2006
Posts: 54
Realy depends on where you live. Here on the east coast, or central, going leaner seems to be the ticket.

The KLR is RICH stock, not lean like the common thought. I have went about 4 sizes leaner on the main and have moved my peak hp to a higher rpm. It now pulles strongly through 7grand. I first did the shim/ airbox trick that I read about. Noticed a decrease in power.

Just so you know that its not my op.. At KLRcarrys drag shop we dynoed about 7 KLRs. EVERY Single one was rich, especially the ones with shimmed needles.. They put out anywhere from 35 to 36 hp. Mine was 2 sizes leaner on the main, dynoed 37hp with 72,000 miles on it! Meefza's new bike was the leanest and was stock, it dynoed at almost 40 hp!!! 39. something.

Now I am not saying that all bikes are rich stock(obviously meef's wasn't) but all the others were.

So before we all go shimming away. YOU might want to know how rich or lean your bike is now. JUST dont go jetting without knowing how your bike already is.
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post #7 of 10 Old 10-09-2006, 11:06 AM
Join Date: Sep 2006
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I have a jet kit I would sell you for a reasonable price if you want to tinker with it. I got that out of my system now though. The PO had it REAL rich and jetted to the max.
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post #8 of 10 Old 10-09-2006, 05:14 PM Thread Starter
Join Date: Oct 2006
Posts: 14
Hey I appreciate all the great info. I thinkI was getting ahead of myself, with the whole jetting idea. I actually sat and read most of the Clymer manual yesterday, and it along with some of the info I have gleaned from you all and others(across all the KLR boards/links), coupled with the air adjust thumb screw I got from Arrowhead, should help me get the carb straight before I start drilling and putting in foreign objects. Eventually I think I will want a little more performance, for now, I think I will learn more about how things work before, messing something up.

Thanx again, Happy and Safe rollin.
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post #9 of 10 Old 10-11-2006, 01:56 PM
Join Date: Sep 2006
Posts: 102
My 2 cents worth: I never jetted my KLR. I never added the washer. I never tore up the snorkle. I never cut holes in the airbox. I never need to touch the carb except for adjusting the idle. I did that once. I have the stock exhaust. I have over 30k on my KLR. It doesn't miss at any rpm, it doesn't need carburator tinkering to 'get it just right'. It doesn't burn oil.
Stock has worked for me. Low maintenance works for me. Low cost, works for me. A couple horse power ain't worth my time and trouble trying to get it all dialed in.

And the quiet lawnmower sound doesn't wake the neighbors when I leave for work at 5am.
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post #10 of 10 Old 10-11-2006, 03:48 PM
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Posts: 24
Originally Posted by Daddyjoe
I wouldn't bother with the shim thing. Just drill the plug, pop it out and adjust the mixture.
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