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Keep & Kill
Last Post: Yakcm2
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3 Weeks Ago
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Land Speed Record
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Join Date: Jan 2015
Posts: 701 Sportster/Buell Model: ironhead sporty Sportster/Buell Year: 79
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Questions on popping after start
Ok so I changed the setting on the needle in the vm38...it says to start off w clip in the 3rd notch....I raised it one to run leaner for my plugs shows I'm running rich.(black soot) so kicked it couple times n forced up but on this one I got lots of popping out the pipes...any thoughts from ya guys in which i truly appreciate n am grateful for how far ya guys got me on this 71xlch
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3 Weeks Ago
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Senior Master Custom Bike Builder
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Join Date: May 2009
Location: 37° 25' 28" N by -80° 03' 42" W
Posts: 10,378 Sportster/Buell Model: XLCH Sportster/Buell Year: 1975
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The jet needle doesn’t really come into play until about 3/4 throttle (twist grip position). Scroll to the end of this guide for a chart showing when each tuning item comes into play...
http://www.mikuni.com/pdf/vmmanual.pdf
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i cut my deck to the queen of spades, but the cards were all the same
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3 Weeks Ago
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Chief of Security
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Join Date: Sep 2017
Location: United States
Posts: 2,323 Sportster/Buell Model: 1200/1250C Sportster/Buell Year: 05
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So when does the main come in then? Cuz the needle comes in more like 1/4 throttle to 3/4 throttle on the hsr42.
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05 1200/1250C/Hammer 570 Cams/E1 clutch kit +15% spring
TC88A Gunner's V00D00 map/DCPR7E/Taylor Pro 8mm
S&S Premium Lifters/KhromeWerks HP Plus 3" slip ons
HSR42 25 pilot 2 turns Y8 needle jet 97 needle 2nd groove 170 main
Dragtron II AC K&N filter/VR1 20W50/Spectro 85wt Primary Oil
Max torque 87.7@4400rpm/max hp 86.8@5600rpm
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3 Weeks Ago
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Senior Master Custom Bike Builder
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Join Date: May 2009
Location: 37° 25' 28" N by -80° 03' 42" W
Posts: 10,378 Sportster/Buell Model: XLCH Sportster/Buell Year: 1975
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Quote:
Originally Posted by 60Gunner
So when does the main come in then? Cuz the needle comes in more like 1/4 throttle to 3/4 throttle on the hsr42.
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My apologies, it looks like I misspoke. Looking at that chart again at the end of the guide the black diamond for the needle begins at 1/4 throttle opening and tapers off at 3/4 throttle. The main jet begins around 2/3 throttle opening to full open. |
3 Weeks Ago
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Senior Chief Master Mechanic 1st Class
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Join Date: Dec 2014
Location: Phoenix
Posts: 1,299 Sportster/Buell Model: xlch Sportster/Buell Year: 1964 Sportster/Buell Model #2: XLCH IR EFI Sportster/Buell Year #2: 1971 Other Motorcycle Model: BMW K1200RS Other Motorcycle Year: 2001
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Needle below the retaining plate?
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3 Weeks Ago
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Land Speed Record
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Join Date: Jan 2015
Posts: 701 Sportster/Buell Model: ironhead sporty Sportster/Buell Year: 79
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If I'm following what your saying correctly, yes...needle first then the locking plate which I'm sure is the retaining plate.
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3 Weeks Ago
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Senior Master Custom Bike Builder
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Join Date: May 2009
Location: 37° 25' 28" N by -80° 03' 42" W
Posts: 10,378 Sportster/Buell Model: XLCH Sportster/Buell Year: 1975
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Quote:
Originally Posted by mickey t
If I'm following what your saying correctly, yes...needle first then the locking plate which I'm sure is the retaining plate.
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Correct. |
3 Weeks Ago
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Senior Chief Master Mechanic 1st Class
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Join Date: Dec 2014
Location: Phoenix
Posts: 1,299 Sportster/Buell Model: xlch Sportster/Buell Year: 1964 Sportster/Buell Model #2: XLCH IR EFI Sportster/Buell Year #2: 1971 Other Motorcycle Model: BMW K1200RS Other Motorcycle Year: 2001
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Re check your batt voltage.I f iremember correctly you had some batteryand/or charging issues previously? Also verify electrical connections at coil and plug wires. Do small changes one at a time.
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3 Weeks Ago
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Land Speed Record
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Join Date: Jan 2015
Posts: 701 Sportster/Buell Model: ironhead sporty Sportster/Buell Year: 79
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Quote:
Originally Posted by Iron Mike
Re check your batt voltage.I f iremember correctly you had some batteryand/or charging issues previously? Also verify electrical connections at coil and plug wires. Do small changes one at a time.
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Yeah got battery straightened out...reads 13...n kept on trickle charger...checked spark plug wire connections n all is good
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3 Weeks Ago
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XL FORUM TEAM MEMBER
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Join Date: Dec 2008
Posts: 914
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Look for a manifold leak or leak around the manifold to carb fitment.
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