Hesitation in throttle - 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 21 Old 08-15-2018, 10:02 AM Thread Starter
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Hesitation in throttle

Finally got my bike up and running, but not very smoothly. Theres a slight hesitation in the throttle when giving it gas. Its not very responsive. I'm thinking it needs some air fuel screw adjustments, but not 100% sure. Just figured I'd ask in here before I go start messing with it. Thanks
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post #2 of 21 Old 08-15-2018, 10:06 AM
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carb could be dirty or gummed up. Do you know what jetting you have? What's your idle speed?

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post #3 of 21 Old 08-15-2018, 10:20 AM Thread Starter
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carb could be dirty or gummed up. Do you know what jetting you have? What's your idle speed?

Dave
I think I have a 158 main jet with 1 washer under the needle (I bought the bike like this and didn't want to mess with it) everything else is stock. I also just cleaned the carb earlier this week so I don't think it'd be clogged or gummed up.
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post #4 of 21 Old 08-15-2018, 11:40 AM
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158 what kind of jet? Dynojet or the stock type? I think I'm running a 146 Dynojet with air box mods and aftermarket slip on. Is this the one you said you cleaned the carb on in an earlier post? Did you take the pilot jet or mixture screw out?

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post #5 of 21 Old 08-15-2018, 12:23 PM
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Doesn't matter what brand the jet is. A 158 anything is WAAAY too big.

The proper jet size for a KLR is in the range of .056" +/-.002", or about 1.4mm.

For Keihin that would be 140 to 147.5
For DynoJet that would be 130 to 136
For Mikuni that would be 121.9 to 127.5

That jet is anywhere from 19% (Keihin) to 70% (Mikuni) too big.

I simply don't know where people get these jetting ideas...

I have airbox mods, KLX needle, 678cc, and a Gixxer pipe. I'm using a 142 and my AFR is about 13:1 as measured with an Innovate LM-2 wideband. I've been tracking fuel economy for the past 32,351 miles and have averaged 43mpg.

I humbly submit this as the best thing to do with a DynoJet kit.
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Last edited by Tom Schmitz; 08-15-2018 at 12:31 PM.
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post #6 of 21 Old 08-15-2018, 12:56 PM
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Maybe mine's a 146, maybe it's the 142, I can't recall off the top of my head. But I was under the impression that the jets were ground to match the taper angle of the brand's needle.

I have no issue with my DynoJet, it runs like a champ with a smooth powerband and no funky hesitation in the transition area.

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2002 Ducati Monster 750S < -- For Sale
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post #7 of 21 Old 08-15-2018, 12:56 PM Thread Starter
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I have a 148 jet I can put in, but despite the jet issue, I now have a hanging idle. It idles a little over 3000 with the choke off but drops to around 1000 with it on. i'm assuming its a vacuum leak but I sprayed carb cleaner into both the intake manifold and the air box manifold and the rpms didn't change. Not sure where else to check.
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post #8 of 21 Old 08-15-2018, 01:02 PM
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There aren't a lot of vacuum points to check. Make sure you don't have an exhaust leak. Your idle issue is between the exhaust, vacuum, pilot jet, that plastic choke nut you said was broken and electrical taped, and mixture screw. This 158 main jet doesn't do anything until, what, 3000 rpm?

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1986 Honda TLR 200 Reflex
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post #9 of 21 Old 08-15-2018, 01:06 PM
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You need to get the carb off and watch some YouTube videos on disassembly, cleaning, jetting, mixture screw adjustment, and reassembling it. You need to deal with the plastic choke nut too, replace it or get the relocator knob.

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1986 Honda TLR 200 Reflex
2002 Ducati Monster 750S < -- For Sale
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post #10 of 21 Old 08-15-2018, 01:16 PM
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Maybe mine's a 146, maybe it's the 142, I can't recall off the top of my head. But I was under the impression that the jets were ground to match the taper angle of the brand's needle...
That is true and a very good point. Thanks for pointing that out.

It is the reason that, with the KLX needle, you go down a jet size. As long as one uses the right needle with the right jet the world is a happy place.

Still, we run into a lot of over-rich conditions with DynoJets and not so much with the KLX (when the recipe is followed ;^))

Tom [email protected]

“She went out slowly. The way she did it hadn’t been learned at business college.” -Philip Marlowe

“'Why' and 'How' are words so important they cannot be too often used.” -Napoleon Bonaparte


Sting like a butterfly.
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