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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #1  
Old 4 Weeks Ago
mickey t's Avatar
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Default 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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  #2  
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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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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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  #4  
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Quote:
Originally Posted by 60Gunner View Post
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.
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.
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Iron Mike Iron Mike is offline
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Needle below the retaining plate?
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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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Quote:
Originally Posted by mickey t View Post
If I'm following what your saying correctly, yes...needle first then the locking plate which I'm sure is the retaining plate.
Correct.
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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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Quote:
Originally Posted by Iron Mike View Post
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.
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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Look for a manifold leak or leak around the manifold to carb fitment.
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