Jetting opinions please - 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 11 Old 01-10-2015, 08:50 AM Thread Starter
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Join Date: Sep 2007
Location: Brisbane Australia
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Jetting opinions please

Hi just rebuild my old klr with a 102mm high compression wossner piston.
This brings my cc up to 678. I have a 145 main jet with the standard needle not spaced fitted.
Am noticing that it starts to have a problem after 100 kph...or 60 mph. Wondering if i need to up the jet size.....bike has freer flowing aftermarket rear exhaust. Air mixture screw has been turned out 2 1/4 turns....any advice from experienced members welcomed.
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post #2 of 11 Old 01-10-2015, 05:37 PM
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Join Date: Jun 2013
Location: Chicago
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Woo Hoo! Another convert!

Are you running high octane fuel? You will need to run a minimum of 95 RON (91 U.S. pump rating). Also I use the stock pipe. The 142.5 should still be good for your pipe.
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post #3 of 11 Old 01-10-2015, 06:40 PM
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Stock main jet is 148 at sea level (source: Clymer manual).

With stock needle and trick pipe, the 145 may be lean.

With KLX needle, 145 may be closer to the mark (men say even smaller main jet appropriate with KLX needle).

No direct experience; info from Internet forums.
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post #4 of 11 Old 01-11-2015, 12:24 AM Thread Starter
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Quote:
Originally Posted by Sandstone View Post
Woo Hoo! Another convert!

Are you running high octane fuel? You will need to run a minimum of 95 RON (91 U.S. pump rating). Also I use the stock pipe. The 142.5 should still be good for your pipe.

have run all grades of fuel no difference might invest in the 148 jet and see what happens
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post #5 of 11 Old 01-11-2015, 08:35 AM
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I've got an '09 with the +1mm over domed top 11:1 Wossner. 142.5 main, KLX needle, clip on 2nd slot, EZ pilot screw 2 turns out, UNI and my snorkel had been pulled. Did this before the Wossie and no changes afterwards. I never tried 87 but I can force it to ping on 89 at WOT in 4th. Zero pinging with 91 or higher. Run the higher octane. There was another Aussie with an '08 who didn't and destroyed his new top end.
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post #6 of 11 Old 01-11-2015, 06:10 PM Thread Starter
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thanks all for your good advice
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post #7 of 11 Old 01-12-2015, 08:00 AM
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Quote:
Originally Posted by artrix View Post
Am noticing that it starts to have a problem after 100 kph...or 60 mph.
Was the bike okay above 100 kph before the modification? And would you elaborate on what kind of problem it has after 100 kph? Is it just a loss of power or does it backfire or hesitate also?

Last edited by twinjet; 01-12-2015 at 08:00 AM. Reason: grammer
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post #8 of 11 Old 01-12-2015, 09:39 AM Thread Starter
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Quote:
Originally Posted by twinjet View Post
Was the bike okay above 100 kph before the modification? And would you elaborate on what kind of problem it has after 100 kph? Is it just a loss of power or does it backfire or hesitate also?
hesitation......................almost feels like a faulty plug, thats been replaced.
thought itcould be plug cap or h/t lead from ignition coil or coil itself. dont have spare coil to swap and check.
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post #9 of 11 Old 01-12-2015, 10:22 AM
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Quote:
Originally Posted by artrix View Post
hesitation......................almost feels like a faulty plug, thats been replaced.
thought itcould be plug cap or h/t lead from ignition coil or coil itself. dont have spare coil to swap and check.
If the KLR can rev to redline in the lower gears (which doesn't require full throttle), the problem is probably not ignition related. If the hesitation only happens in high gear above 100 kph, carburation may be suspect. Does it idle okay?
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post #10 of 11 Old 01-13-2015, 07:31 AM Thread Starter
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Join Date: Sep 2007
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all sorted thanks all for the advice given....cheers went to 155 main and put washer under needle,,,,,,,,,goes like a train now
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