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

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  #11  
Old 10th March 2015
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Sportster/Buell Model: Ironhead
Sportster/Buell Year: 1976
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Other Motorcycle Year: 1979
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Well on the watch list it goes lol
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  #12  
Old 10th March 2015
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Thank you for the info, Eric.......
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  #13  
Old 10th March 2015
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ericfreeman ericfreeman is offline
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Sportster/Buell Model: Ironhead XLH Sportster
Sportster/Buell Year: 1978
Sportster/Buell Model #2: Ironhead XLT Sportster
Sportster/Buell Year #2: 1977
Other Motorcycle Model: Honda CBX 1000
Other Motorcycle Year: 1979
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Quote:
Originally Posted by KNuckleheadSteve View Post
Thank you for the info, Eric.......
No problem. Feel free to contact me if/when you have any further questions. These are wonderful little carbs and I'm happy to help others keep them alive.

Eric
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1978 Anniversary Edition XLH. Wiseco 10:1 forged pistons, Andrews R5 cams, dual plugged heads with Super Port Flow, single fire ignition, Mikuni Solex 36 PHH carb, Jagg oil cooler, '73 gauges, kickstart, Barnett kevlar clutch, Progressive front springs, Hagon Nitro shocks, all-Andrews tranny. 1977 XLT, Mikuni Solex 36 PHH carb, tapered dual exhausts, Andrews Y cams, Progressive front springs, Hagon Nitro shocks.
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  #14  
Old 8th April 2016
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Sportster/Buell Model: XLCH
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Thread necro to keep the info in a single relevant thread?

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Originally Posted by ericfreeman View Post
Main jets were originally 135's with the air correctors (on top of the emulsion tube) usually 180's.
Mine are etched 135 but tops are 220. From my calculation, that's 2/3 more flow (cross sectional area) than stock. Do you know how the air correctors work? Is this going to be really rich on a pretty stock bike? 60% would be damn near flooding if it was straight jetting, but I don't know how the air corrector system works at all. Never seen anything like it, except pilot air screws that let the carb pull more air and thus more fuel.

BTW, it came with drag pipes which I'm keeping until I can find someone to make a decent 2-into-1. I have some torque cones that are supposed to fit and will get some DIY lollipops at the least. You think I'm okay to start where the jets are at for now? I haven't run the bike yet--still doing some other work and it's my first ironhead, so I'm not sure where to start on jetting.

Hex
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  #15  
Old 9th April 2016
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Sportster/Buell Model: Ironhead XLH Sportster
Sportster/Buell Year: 1978
Sportster/Buell Model #2: Ironhead XLT Sportster
Sportster/Buell Year #2: 1977
Other Motorcycle Model: Honda CBX 1000
Other Motorcycle Year: 1979
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The air jet does exactly that: let's in air to the emulsion tube. The main jet on the bottom allows fuel to enter the tube where they mix. A 220 is pretty big and will lean out your mixture. Fortunately, air jets are available on Ebay and from Wolf Creek Racing. Wolf Creek supports the Mikuni-Solex carbs used on various Japanese tuner cars and while most of the parts are different between carb models, the jets are interchangeable.

If your engine is stock, I'd try a 180-185 air corrector jet to go with your 135 main. What size pilot jet are you running? With the Mikuni-Solex carbs, you're on the pilot jet during most cruising speeds when the throttle is barely cracked open. If you get much coughing (lean pop) from the carb when cruising on a warm engine, you can install the next size up pilot to see if that helps.

Welcome to the Mikuni-Solex club! They're awesome carbs and I'm glad I had the chance to meet Jerry Branch who sold me my first one back in 1977.

Eric
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  #16  
Old 9th April 2016
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Thanks for the reply. Yeah, I wasn't sure which way the air jets would function since Keihin air screws are the opposite, open = richer. Most of my experience is on CVK's which are great on newer bikes but I'm already liking some parts of this Mikuni, even the coarser jet threads. I wonder why they had such lean ones in. Pilots are #55 and yeah, I should be on pilots most of the time. There's no transitional/mid circuit screw on these, is there?

Are the air corrector jets specific or are they standard Kuni jets?
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  #17  
Old 9th April 2016
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Sportster/Buell Model: Ironhead XLH Sportster
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Sportster/Buell Year #2: 1977
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A 55 pilot might be a bit big for a stock motor. I think I run a 52 in my relatively stock '77 XLT and a 55 in my built '78 motor. Fortunately, jets are so damn easy to change on these carbs that it's a pleasure to swap them out!

I believe the jets are specific to the Mikuni-Solex carbs and won't interchange with any other Mikuni carbs. They're easy to get though and I found it easiest to order an assortment to have on hand rather than ordering just 2 at a time.

K&N still make an air filter for the 36 PHH carbs so you have a modern option there. I happen to like the RamFlo air filters from Australia and while they don't make one for the M-S, the normal Weber 40 DCOE filter will fit the K&N baseplate if you remove the metal bracket that holds the screw. Works very well and is distinctive.

Eric
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  #18  
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Looking to have phh36 rebuilt. Anybody willing to do this?
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  #19  
Old 1 Week Ago
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What shape is your carb in? You can get a gasket kit from Italy on Ebay and some other parts are available from Wolf Creek racing. I've rebuilt many of these carbs, having become a big fan when I bought my first one from Jerry Branch back in 1977. I now run two of them on my '77 and '78 Ironheads. I keep a spare just in case another project comes up.

Eric
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Can you contact me at sales@pautollc.com?

Quote:
Originally Posted by ericfreeman View Post
What shape is your carb in? You can get a gasket kit from Italy on Ebay and some other parts are available from Wolf Creek racing. I've rebuilt many of these carbs, having become a big fan when I bought my first one from Jerry Branch back in 1977. I now run two of them on my '77 and '78 Ironheads. I keep a spare just in case another project comes up.

Eric
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