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11-14-2012, 07:44 PM
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#1 |
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Gnarly Adventurer
Joined: Mar 2009
Location: OZ
Oddometer: 104
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vac leak?
Hi, I just installed new carby on bigger barrel. Tuned it up and everything seems to be fine within specs except - when I sharply close the throttle (two cables design) the revs gradually go to idle. I mean gradually: 3 -- 5 secs instead just comeback to 1.5k instantly. Cables are fine, carby jetted as most people do for my configuration. Anybody seen that weird behavior?
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11-14-2012, 08:56 PM
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#2 |
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Woolf Barnato
Joined: Jul 2004
Location: OAK
Oddometer: 29,324
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Lean idle mixture.
__________________
'Gonna get me a six pack...push people off the highway!' "they live off the carrion of our mutual distrust and bribe us with symbols that equate hatred with manhood." "I mean at the end of the day, I was addicted to Starting Fluid for Christ's sake!" "Yeah, that guy sure is terrible at touching moms" |
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11-14-2012, 09:28 PM
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#3 |
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Gnarly Adventurer
Joined: Mar 2009
Location: OZ
Oddometer: 104
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does it mean that pilot jet must go up size or two?
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11-14-2012, 09:46 PM
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#4 | |
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Woolf Barnato
Joined: Jul 2004
Location: OAK
Oddometer: 29,324
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Quote:
__________________
'Gonna get me a six pack...push people off the highway!' "they live off the carrion of our mutual distrust and bribe us with symbols that equate hatred with manhood." "I mean at the end of the day, I was addicted to Starting Fluid for Christ's sake!" "Yeah, that guy sure is terrible at touching moms" |
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11-14-2012, 09:59 PM
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#5 |
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Gnarly Adventurer
Joined: Mar 2009
Location: OZ
Oddometer: 104
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Hmmm if I play with mixture screw it will increase or decrease revs. At the moment I have 1.5k rpm on idle very stable. Mixture screw is 2.3 out after tuning. Originally it was at 2.5.. I was using Mikuni man to tune up mixture and idle screws. Going in and out to extremes of mix screw was killing the engine. Could you tell me exactly how to try.
alexgg screwed with this post 11-14-2012 at 10:10 PM |
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11-14-2012, 10:17 PM
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#6 |
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Gnarly Adventurer
Joined: Jun 2008
Location: Orange, CA
Oddometer: 479
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What bike?
Mainly posting so I can come back to this because my Girlfriend's klr is doing the same thing. I still need to drill out the idle screw to clean and check it.
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04 KLR 650 07 KLR 650 06 sv650s 07 Ducati Monster |
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11-14-2012, 10:47 PM
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#7 |
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Gnarly Adventurer
Joined: Aug 2011
Location: up nort' somewheres
Oddometer: 107
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Raise the idle speed to ~2500 RPM. Adjust the idle mixture screw until the RPM achieves a maximum, then back out the screw maybe 1/8th turn. Restore the idle speed to the desired level. Go for a ride and see how it does.
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'76 R90/6, '07 K1200GT Rounder #6 MOA Ambassador, Biergarten co-chair RA WI Regional Rep, rally security chair |
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11-15-2012, 05:17 AM
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#8 |
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Beastly Adventurer
Joined: Aug 2004
Oddometer: 1,579
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Check the vac hoses, my KLR did the same thing after I was careless pushing on the vac hose behind the shutoff, not all the way over the bulge. Also, sure you didn't pinch the diaphram or that is doesn't have a small hole in it?
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11-15-2012, 06:04 AM
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#9 |
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Gnarly Adventurer
Joined: Mar 2009
Location: OZ
Oddometer: 104
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Carby is TM36-68 pumper flat-slide. Bike KLX350 big bore. There are no vac hoses on this kind of carby coz it is not CV. I will try to retune at 2500rpm and see what gonna happens...
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11-15-2012, 10:59 AM
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#10 |
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Rectum Non Bustibus
Joined: May 2009
Location: Dearborn, MI
Oddometer: 3,641
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You might check that there's no split in the rubber adapter between the carb and head. To check for vacuum leaks, use an unlit propane torch and go around anywhere a leak might be. RPM will change if a leak is found.
__________________
10 Ducati 1098 Streetfighter S - "Sleipnir" 09 Kaw Versys "The problem with Socialism is that you eventually run out of other people's money" _____ Margaret Thatcher |
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11-15-2012, 02:22 PM
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#11 | |
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Gnarly Adventurer
Joined: Mar 2009
Location: OZ
Oddometer: 104
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Quote:
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11-15-2012, 02:23 PM
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#12 | |
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Rides slow bike slow
Joined: Aug 2008
Location: New(er) Mexico
Oddometer: 9,774
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Quote:
WD-40 works too but is messier.
__________________
 You couldn't hear a dump truck driving through a nitro glycerin plant!Badasses might screw with another badass. Nobody screws with a nut job. -- Plaka |
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