The Sportster and Buell Motorcycle Forum - The XLFORUM®
 

Go Back   The Sportster and Buell Motorcycle Forum - The XLFORUM® > SPORTSTER MOTORCYCLE FORUM > Sportster Motorcycle Era Specific and Model Specific > Ironhead Sportster Motorcycle Talk (1957-1985)
XLF Blogs XLF Arcade XLF Disclaimer/Privacy Statement/Terms Of Use

Notices

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

Active Threads
11 How much did you spend on accessories in the first month?
Last Post: Folkie
Posted On: 15 Minutes Ago
Replies: 173
Views: 13,941
0 Does 20W60 reduce cam gear noise?
Last Post: XL Dane
Posted On: 23 Minutes Ago
Replies: 15
Views: 323
0 TC88A EX lower MAP settings
Last Post: Tomcatt
Posted On: 26 Minutes Ago
Replies: 3
Views: 23
0 Iree's late night cafe
Last Post: ZCarFan
Posted On: 26 Minutes Ago
Replies: 1,653
Views: 221,354
0 No juice, no run, no power, nothing...
Last Post: 81ironhead77
Posted On: 27 Minutes Ago
Replies: 4
Views: 25
0 Keep & Kill
Last Post: fafcpa
Posted On: 31 Minutes Ago
Replies: 17,855
Views: 1,043,984
0 Anyone go racing last weekend?
Last Post: madnss
Posted On: 39 Minutes Ago
Replies: 3,196
Views: 328,344
0 Hagerty Insurance
Last Post: Pigskinner
Posted On: 50 Minutes Ago
Replies: 5
Views: 266
0 Official XL Forum Random Image Thread (NO NUDITY!)
Last Post: Stairman
Posted On: 53 Minutes Ago
Replies: 47,994
Views: 7,712,841
0 Hottie of the day, no nudity.
Last Post: Stairman
Posted On: 55 Minutes Ago
Replies: 20,781
Views: 2,135,316
0 Hot Chicks on Hot Bikes
Last Post: trainman
Posted On: 2 Hours Ago
Replies: 10,882
Views: 2,104,728
0 Poll: Saddlebag Supports
Last Post: Stairman
Posted On: 2 Hours Ago
Replies: 52
Views: 13,082
0 magneto twin plug heads
Last Post: marioserafica
Posted On: 3 Hours Ago
Replies: 36
Views: 6,700
0 ....1
Last Post: DEEP DIVER
Posted On: 3 Hours Ago
Replies: 5,687
Views: 329,380
0 Fun or money?
Last Post: bill smith
Posted On: 4 Hours Ago
Replies: 30
Views: 1,309
0 Roads I'd like to ride.
Last Post: cal43
Posted On: 4 Hours Ago
Replies: 3,168
Views: 298,463
5 Wet Dream, Ever Have One?
Last Post: Toejam503
Posted On: 5 Hours Ago
Replies: 88
Views: 17,077
0 Down on oil
Last Post: Billy1200
Posted On: 6 Hours Ago
Replies: 13
Views: 227
0 1968 xlch
Last Post: Ferrous Head
Posted On: 6 Hours Ago
Replies: 24
Views: 2,608
0 blonde, brunette, red?
Last Post: Ireeman
Posted On: 8 Hours Ago
Replies: 268
Views: 47,897
0 Hamburger drum brake clunk noise
Last Post: nickfracture
Posted On: 10 Hours Ago
Replies: 4
Views: 131
0 Compression tool for working on springer front ends?
Last Post: Tim The Grim
Posted On: 10 Hours Ago
Replies: 3
Views: 97
0 Food porn
Last Post: Crusty
Posted On: 14 Hours Ago
Replies: 2,028
Views: 392,827
0 I'm here to introduce Gristle.
Last Post: apotheon
Posted On: 14 Hours Ago
Replies: 16
Views: 448
0 Converting 2003 engine to fuel injection setup from 2007&UP model
Last Post: Randy_rots
Posted On: 14 Hours Ago
Replies: 16
Views: 2,049
6 Blast Project (and will be needing help most likely)
Last Post: apotheon
Posted On: 14 Hours Ago
Replies: 127
Views: 23,434
0 Wish I had a beach with a ocean
Last Post: Akdawg
Posted On: 14 Hours Ago
Replies: 1
Views: 82
10 big bore question
Last Post: Ferrous Head
Posted On: 15 Hours Ago
Replies: 72
Views: 13,546
0 Transmission figment
Last Post: Ferrous Head
Posted On: 15 Hours Ago
Replies: 5
Views: 305
0 Smoke and top end job
Last Post: Maxeffort
Posted On: 15 Hours Ago
Replies: 14
Views: 495
More...
Members Birthdays
win307 (66), JrzyDave (59), WeirdNJ (59), Pigskinner (46), jeepsoldier (44), Virgdog (34), bernardderek, John Titor (22)
Tags
dual throat, mikuni, solex

Reply
 
Share Thread Tools Display Modes
  #1  
Old 9th March 2015
KNuckleheadSteve KNuckleheadSteve is offline
Biker
 
Join Date: Apr 2011
Posts: 6
Sportster/Buell Model: Mount Airy
Sportster/Buell Year: 2000
Reputation: 29
KNuckleheadSteve is an unknown quantity at this point
Default Mikuni/Solex Dual Throat Tuning Instructions

Does anyone know where I can get tuning instructions for a Mikuni/Solex Dual Throat carb? I'm probably gonna need a few parts too. Where can ya get em?
Reply With Quote
  #2  
Old 9th March 2015
72 Ironhead XLH's Avatar
72 Ironhead XLH 72 Ironhead XLH is offline
Senior Master Custom Bike Builder
 
Join Date: May 2005
Location: NJ
Posts: 5,914
Sportster/Buell Model: XLH
Sportster/Buell Year: 72
72 Ironhead XLH has disabled reputation
Default

Havent seen that since the 1970`s along with the Weber . Have no Idea for parts or tuning on a 45 year old carb.
Reply With Quote
  #3  
Old 9th March 2015
brucstoudt's Avatar
brucstoudt brucstoudt is offline
Senior Master Custom Bike Builder
 
Join Date: May 2010
Location: Pottstown PA.
Posts: 13,871
Sportster/Buell Model: xlch
Sportster/Buell Year: 1960
Reputation: 515799
brucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond reputebrucstoudt has a reputation beyond repute
Default

member ericfreeman might know. he run's one on his ironhead,maybe both of them.if he see's this,he should reply.
__________________
72 1000cc barrels and heads, s&s 41/2'' flywheels, sifton cams, s&s super B w/ zippers thunderjet w/yost powertube, andrews gears,and shafts, competition engineering kevlar wet or dry clutch, 72 oil pump, morris magneto w/auto advance and single fire module, cycle electric generator w/electronic regulator,73 cu.in.
Reply With Quote
  #4  
Old 10th March 2015
ericfreeman's Avatar
ericfreeman ericfreeman is offline
XL FORUM TEAM MEMBER
 
Join Date: May 2007
Posts: 4,909
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
Reputation: 56618
ericfreeman is a splendid one to beholdericfreeman is a splendid one to beholdericfreeman is a splendid one to beholdericfreeman is a splendid one to beholdericfreeman is a splendid one to beholdericfreeman is a splendid one to beholdericfreeman is a splendid one to beholdericfreeman is a splendid one to beholdericfreeman is a splendid one to beholdericfreeman is a splendid one to beholdericfreeman is a splendid one to behold
Default

I'm running 2 Mikuni-Solexes, one on my '78 and another on my '77. I also have a spare on hand in case another old Ironhead comes sniffing around my garage! Bought my first Mikuni-Solex 36PHH from Jerry Branch himself back in 1977 for my new XLCH. Absolutely fell in love with the carb and threw the OEM Keihin in the trash. Simple to tune, reliable, very fuel efficient and awesome throttle response. Only problem was for guys with long legs since the carbs stick out a ways.

You'll need a support for the carb since it sticks out. I use some 1/8" x 5/8" stainless flat bar that bent into an 'L' shape. It bolts to the bottom front mounting bolt between the carb and the manifold and has the short leg going to the stud on the front cylinder intake tappet guide. You'll need to add a little twist to the short leg to get things lined up. A bit of trial and error is required for a good fit.

You can source idle jets, main and air jets, accelerator pump parts from Wolf Creek Racing. These parts are common across lines for the larger Mikuni-Solex auto carbs used by lots of racers. Top cover gaskets you'll have to make or buy a repair kit from a fellow in Italy (http://www.ebay.com/itm/261349017331...%3AMEBIDX%3AIT). Solex carbs were used on lots of small European cars back in the day and the kit on Ebay does have gaskets that match (I bought a kit to verify this).

One thing you'll notice if your carb is still original as set up by Jerry Branch is that the main jet (the small jet on the bottom of the emulsion tube) was machined down and had a small brass extension tube fitted to it. Apparently, there was a problem with running the float bowl low on gas and the extension tube allowed for drawing gas from the very bottom. I've run standard jets and didn't notice any problem during normal running.

Typical idle/pilot jets would be anywhere from 45-55. I find that 52-55 gives good performance without any carb coughing from being slightly lean. Remember, you'll be running on the idle jet most of the time when just cruising as these carbs are amazingly efficient. I average 50-55 mpg on my Ironheads.

Set the two mixture screws at 1-1/2 turns out from a lightly seated position for initial tuning. I've found that due to the shape of the intake manifold, the rear carb barrel actually feeds the front cylinder, vice-versa for the front carb barrel. I know it sounds strange but when you play with the mixture screws you'll notice the opposite cylinder is affected. At least that's how it works on my two Ironheads.

Main jets were originally 135's with the air correctors (on top of the emulsion tube) usually 180's. If you have the brass extension tubes on your main jets, they should have the jet size etched on the side. Turning down the jets to fit the extension tubes erased the OEM sizing on the side of the main jets.

Nice thing with the M-S carbs is you can easily change jets through the small cover on top: no need to drop float bowls or other nonsense.

Best air filter is the K&N which is still available. I tend to like the Ramflo filters from Australia but they don't make one for the M-S 36PHH carb. However, I found that if you buy the Ramflo for a Weber 40DCOE, the filter/support and cover will fit the K&N baseplate once you cut off the screw support on the base plate. I can send you pics if you need more info.

Concerning throttle cables, I run slightly longer cables that go between the cylinders for a clean run to the linkage on the carb. I use only teflon lined cables since they're subject to heat between the barrels and also use some split tubing to further insulate the cables where they get closest to the hot barrels.

When you go to start a cold engine, the enrichener is that small round part on the top of the cover with a hole for mounting a cable or small knob. Fully enriched is with the lever pushed forward, or clockwise. Give the throttle a twist or two and then leave it alone. When the engine starts it will sound like it has an air leak but that's just the enrichener working. The enrichener has two 'on' positions with the middle position providing less fuel/air. I usually only keep the enrichener on until I'm up to speed on the road but sometimes the bike runs smoother with a little enrichener on until the carb warms up.

Not much else I can think of right now. Be aware that the fuel inlet needle/seat is a special part for gravity feed situations and the needle/seats sold by Wolf Creek won't work. If you need a replacement needle/seat, you'll have to search Ebay for a 3.5 needle/seat. Last one I got came from Europe.

Hope this helps.

Cheers, Eric
__________________
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.

Last edited by ericfreeman; 10th March 2015 at 04:41..
Reply With Quote
  #5  
Old 10th March 2015
blue's Avatar
blue blue is offline
Land Speed Record
 
Join Date: Jul 2013
Posts: 789
Sportster/Buell Model: Ironhead
Sportster/Buell Year: 1976
Other Motorcycle Model: Honda Xr500 streetfighter
Other Motorcycle Year: 1979
Reputation: 20211
blue is a name known to allblue is a name known to allblue is a name known to allblue is a name known to allblue is a name known to allblue is a name known to allblue is a name known to allblue is a name known to allblue is a name known to allblue is a name known to allblue is a name known to all
Default

They look fn awesome!! But god its got to be a bear to adjust and rebuild
__________________
Saying a Sportster is half a Harley is like saying a Corvette is half a Chevy.
Reply With Quote
  #6  
Old 10th March 2015
ericfreeman's Avatar
ericfreeman ericfreeman is offline
XL FORUM TEAM MEMBER
 
Join Date: May 2007
Posts: 4,909
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
Reputation: 56618
ericfreeman is a splendid one to beholdericfreeman is a splendid one to beholdericfreeman is a splendid one to beholdericfreeman is a splendid one to beholdericfreeman is a splendid one to beholdericfreeman is a splendid one to beholdericfreeman is a splendid one to beholdericfreeman is a splendid one to beholdericfreeman is a splendid one to beholdericfreeman is a splendid one to beholdericfreeman is a splendid one to behold
Default

Quote:
Originally Posted by blue View Post
They look fn awesome!! But god its got to be a bear to adjust and rebuild
Not at all!! I've rebuilt the four I purchased used and other than the gaskets for the top cover, everything else was easy to find. Also, once the mixture screws are adjusted for smooth running, that's pretty much it. Changing jets to get the best mixture under load is very easy to do and once you have them sorted you never have to touch anything again. These vintage carbs are fantastic and I'll never use anything else. By the way, I've run stock Keihin, Weber DCOE40 and S&S Super E on my Ironheads before going back to the Mikuni-Solex.

Eric
Reply With Quote
  #7  
Old 10th March 2015
blue's Avatar
blue blue is offline
Land Speed Record
 
Join Date: Jul 2013
Posts: 789
Sportster/Buell Model: Ironhead
Sportster/Buell Year: 1976
Other Motorcycle Model: Honda Xr500 streetfighter
Other Motorcycle Year: 1979
Reputation: 20211
blue is a name known to allblue is a name known to allblue is a name known to allblue is a name known to allblue is a name known to allblue is a name known to allblue is a name known to allblue is a name known to allblue is a name known to allblue is a name known to allblue is a name known to all
Default

Hmmmm may have to find one for the next ironhead. Im trying to set each one up differently lol
Reply With Quote
  #8  
Old 10th March 2015
ericfreeman's Avatar
ericfreeman ericfreeman is offline
XL FORUM TEAM MEMBER
 
Join Date: May 2007
Posts: 4,909
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
Reputation: 56618
ericfreeman is a splendid one to beholdericfreeman is a splendid one to beholdericfreeman is a splendid one to beholdericfreeman is a splendid one to beholdericfreeman is a splendid one to beholdericfreeman is a splendid one to beholdericfreeman is a splendid one to beholdericfreeman is a splendid one to beholdericfreeman is a splendid one to beholdericfreeman is a splendid one to beholdericfreeman is a splendid one to behold
Default

Quote:
Originally Posted by blue View Post
Hmmmm may have to find one for the next ironhead. Im trying to set each one up differently lol
The prices seem to be rising quickly for these rare carbs. Plus, you need the Branch manifold to fit one to the motor. Beware of folks offering to sell only the carb since it's worthless without the manifold (unless you already have one). A fair price for a carb that needs some TLC is anywhere from $75-$150. Lately they seem to around $500 for a rebuilt unit but if you're patient you might find one for less.

Eric
Reply With Quote
  #9  
Old 10th March 2015
Robicycle's Avatar
Robicycle Robicycle is offline
Master Custom Bike Builder
 
Join Date: Jan 2011
Location: Canada
Posts: 3,366
Sportster/Buell Model: XLCH
Sportster/Buell Year: 1969
Reputation: 11515
Robicycle is a glorious beacon of lightRobicycle is a glorious beacon of lightRobicycle is a glorious beacon of lightRobicycle is a glorious beacon of lightRobicycle is a glorious beacon of lightRobicycle is a glorious beacon of lightRobicycle is a glorious beacon of lightRobicycle is a glorious beacon of lightRobicycle is a glorious beacon of lightRobicycle is a glorious beacon of lightRobicycle is a glorious beacon of light
Default

There is a dual throat on chopcult right now for $250...Mikuni Solex.
Reply With Quote
  #10  
Old 10th March 2015
JBA123 JBA123 is offline
Harley Engineer
 
Join Date: Apr 2013
Posts: 334
Sportster/Buell Model: XLH
Sportster/Buell Year: 1985
Reputation: 3683
JBA123 is a jewel in the roughJBA123 is a jewel in the roughJBA123 is a jewel in the roughJBA123 is a jewel in the roughJBA123 is a jewel in the roughJBA123 is a jewel in the roughJBA123 is a jewel in the roughJBA123 is a jewel in the roughJBA123 is a jewel in the roughJBA123 is a jewel in the roughJBA123 is a jewel in the rough
Default

I have two, one is on my bike right now. Once it gets put back together i'll post results and pictures.
Reply With Quote
Reply

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



All times are GMT +1. The time now is 13:34.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
XL Forum® - Linson Media LLC