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 Headlight bulb rotation? 
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Post Headlight bulb rotation?
Do H4 bulbs need to be installed at a certain rotation, like the top of the three tabs pointing directly up. I put in dual headlight wiring and 45w bulbs but not sure I got them directly rotated the same in the rubber cups.

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2014 Zuma 125


Sat Aug 20, 2016 4:17 pm
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Post Re: Headlight bulb rotation?
h4 has 3 prongs on the bulb base
they will only fit one way into a h4 headlight

so its kinda hard to install wrong
unless your not using h4 bulbs

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2010 Zuma 155cc
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Sat Aug 20, 2016 8:28 pm
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Post Re: Headlight bulb rotation?
Ya they are three prong and seem ok they are just not perfectly aligned with the top tap pointing straight up. They are rotated a little so the top tab is at 1:00 instead of 12:00 so to speak.

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Sat Aug 20, 2016 8:35 pm
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Post Re: Headlight bulb rotation?
most h4 lights I work on (as I take them apart and install halo light rings in them)
its not set at 12oclock straight up

they are off to the side a touch. or twisted
the molding in the headlight lens itself
if that makes sense

I think the factory has figured the best light pattern if the bulb is clocked to the side a touch

is this what your referring too?


or are you saying your actual h4 bulbs tabs are too thin and it causes the bulb to sit crooked?


later I may be able to get some pics to show what im trying to describe

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2010 Zuma 155cc
BWS X Digital Gauges<>Clear Smoke BWS 125 Turn Signal Covers<>Billet Bar Ends<>Front Brake Rotor 260mm<>Razor Cam Covers<>NCY Breather Assembly<>Polini EVO Clutch Bell<>Anodized Orange Dipstick<>RRGS Front and Rear Shocks<>Dual 5000K HID's 35w High/Low Beam<>Black Adjustable Brake levers<>Halo Led's<>TST 2 Stage Variator 9gL 10gS <>NCY Oil Cooler<>Yamaha Skid Plate<>NCY Contra Spring Bearing<>1000 Rpm RRGS Contra Spring<>Yoshimura Exhaust<>NCY Direct Ignition Coil<>Lightweight Cooling Fan<>Koso Cable Clamps<>High Lift Cam+Lightened Cam Sprocket<>Underseat Storage Bag<>Stage 6 (Koso) Clutch<>Accel Handlebars<>Koso Brake Light<>Lightweight Swingarm<>RRGS 4 Pot Caliper (PH80)<>Stainless Braided Brake Line<>Lightened F|ywheel<>OEM Headlight Screens<>Zubiku Wing<>Air Horn<>9 inch stretch<>Koso High Flow Filter/Cover<>RPM 10 Spoke Wheels<>Digital Camo Vinyl Wrap<>SEP Cvt Covers





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Sun Aug 21, 2016 8:31 am
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Post Re: Headlight bulb rotation?
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h4 lights off 2 different bikes
you can see they both twist the bulb slightly from level

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2010 Zuma 155cc
BWS X Digital Gauges<>Clear Smoke BWS 125 Turn Signal Covers<>Billet Bar Ends<>Front Brake Rotor 260mm<>Razor Cam Covers<>NCY Breather Assembly<>Polini EVO Clutch Bell<>Anodized Orange Dipstick<>RRGS Front and Rear Shocks<>Dual 5000K HID's 35w High/Low Beam<>Black Adjustable Brake levers<>Halo Led's<>TST 2 Stage Variator 9gL 10gS <>NCY Oil Cooler<>Yamaha Skid Plate<>NCY Contra Spring Bearing<>1000 Rpm RRGS Contra Spring<>Yoshimura Exhaust<>NCY Direct Ignition Coil<>Lightweight Cooling Fan<>Koso Cable Clamps<>High Lift Cam+Lightened Cam Sprocket<>Underseat Storage Bag<>Stage 6 (Koso) Clutch<>Accel Handlebars<>Koso Brake Light<>Lightweight Swingarm<>RRGS 4 Pot Caliper (PH80)<>Stainless Braided Brake Line<>Lightened F|ywheel<>OEM Headlight Screens<>Zubiku Wing<>Air Horn<>9 inch stretch<>Koso High Flow Filter/Cover<>RPM 10 Spoke Wheels<>Digital Camo Vinyl Wrap<>SEP Cvt Covers





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Sun Aug 21, 2016 12:42 pm
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Post Re: Headlight bulb rotation?
Very interesting, thanks. So I guess its just trial and error.

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Thu Aug 25, 2016 11:39 am
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Post Re: Headlight bulb rotation?
whats trial and error?

the bulb only installs one way

you look at the tabs, spin the bulb until the tabs line up and it drops in

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2010 Zuma 155cc
BWS X Digital Gauges<>Clear Smoke BWS 125 Turn Signal Covers<>Billet Bar Ends<>Front Brake Rotor 260mm<>Razor Cam Covers<>NCY Breather Assembly<>Polini EVO Clutch Bell<>Anodized Orange Dipstick<>RRGS Front and Rear Shocks<>Dual 5000K HID's 35w High/Low Beam<>Black Adjustable Brake levers<>Halo Led's<>TST 2 Stage Variator 9gL 10gS <>NCY Oil Cooler<>Yamaha Skid Plate<>NCY Contra Spring Bearing<>1000 Rpm RRGS Contra Spring<>Yoshimura Exhaust<>NCY Direct Ignition Coil<>Lightweight Cooling Fan<>Koso Cable Clamps<>High Lift Cam+Lightened Cam Sprocket<>Underseat Storage Bag<>Stage 6 (Koso) Clutch<>Accel Handlebars<>Koso Brake Light<>Lightweight Swingarm<>RRGS 4 Pot Caliper (PH80)<>Stainless Braided Brake Line<>Lightened F|ywheel<>OEM Headlight Screens<>Zubiku Wing<>Air Horn<>9 inch stretch<>Koso High Flow Filter/Cover<>RPM 10 Spoke Wheels<>Digital Camo Vinyl Wrap<>SEP Cvt Covers





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Thu Aug 25, 2016 3:10 pm
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