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

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  #61  
Old 13th August 2022
73HEAD 73HEAD is offline
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Originally Posted by doodah man View Post
I never saw if you checked your intake manifold to head spigot alignment. Runs like crap until it heats up and seals well…? Those two intake o-rings should have an equal feeling gap all the way around on each side where manifold meets the heads. Are the heads and intake mani both o-ring style fitment??

Check this old post…
http://xlforum.net/forums/showpost.p...2&postcount=30

Just covering over the basics first.
i just read that. thanks. for such a seemingly simple setup, there certainly is a lot to it.
A over B divided by C equals D type thing. im in the process now of trying to fact find now.
thanks mate
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  #62  
Old 13th August 2022
73HEAD 73HEAD is offline
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Originally Posted by Iron Mike View Post
Have you checked the slide and body condition of the Mik? Higher mileage TM’s were prone to slide wear resulting in air leak around the slide in a closed position.
Just a thought
thanks mate
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  #63  
Old 13th August 2022
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There is a valid reason some people like Mikunis.

They are more "tunable" than Super B's. ie there are more adjustments the tuner can make.

And that''s great if you know exactly what your doing and are usingg an O1 sensor to do the tuning.

But it's also easier to get things wrong. Or to have a problem with them.

Rge Super B's can be made to produce nearly a flat line A/F graph with the simple addition of an air bleed hole tapped for a fixed jet. This gives you 4 circuits to play with.
And if you really feel the need ad an Accelo Bowl.

Actually, I'm thinking Branko built you a stroker ? Or helped with the build ?

A 40 mm carb is going to be too small on the top end if that's the case.
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  #64  
Old 14th August 2022
73HEAD 73HEAD is offline
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Originally Posted by Ferrous Head View Post
There is a valid reason some people like Mikunis.

They are more "tunable" than Super B's. ie there are more adjustments the tuner can make.

And that''s great if you know exactly what your doing and are usingg an O1 sensor to do the tuning.

But it's also easier to get things wrong. Or to have a problem with them.

Rge Super B's can be made to produce nearly a flat line A/F graph with the simple addition of an air bleed hole tapped for a fixed jet. This gives you 4 circuits to play with.
And if you really feel the need ad an Accelo Bowl.

Actually, I'm thinking Branko built you a stroker ? Or helped with the build ?

A 40 mm carb is going to be too small on the top end if that's the case.
whatever branko did has given this ride of mine a lot of get up and go. it really does hammer. however, you are correct in saying that its easy to mistune a mikuni. i simply dont know what im doing and what i do do hasnt a pattern. im sure a lot of my problems are self induced. its a good learning curve for me though and i cant really destroy to much. thanks
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  #65  
Old 15th August 2022
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Originally Posted by 73HEAD View Post
whatever branko did has given this ride of mine a lot of get up and go. it really does hammer. however, you are correct in saying that its easy to mistune a mikuni. i simply dont know what im doing and what i do do hasnt a pattern. im sure a lot of my problems are self induced. its a good learning curve for me though and i cant really destroy to much. thanks
fb, do i need an insulator block/gaset to fit a super b to my ironhead? thanks
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  #66  
Old 15th August 2022
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neither. the Super B has an o-ring in the mounting flange.you're waiting 18+hrs. for a reply.i obliged.
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  #67  
Old 16th August 2022
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neither. the Super B has an o-ring in the mounting flange.you're waiting 18+hrs. for a reply.i obliged.
thanks
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  #68  
Old 14 Hours Ago
73HEAD 73HEAD is offline
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i ended up ditching the tm 40 mikuni and picked up a super b. the old girl ( bike ) loves it. no matter what i did i couldnt get the mikuni to do the right thing. since ive owned the bike ive tried a cv, a bendix and a tm 40 flatside mikuni. now the super b. this carb is the missing link. what a difference to everything. it even sounds better out of the exaust. i enjoyed the wheelie popping potential of the mikuni but dont think im losing much with the super b. the way the b requires the rider to use the throttle as apposed to the mikuni is very different but i like the different style of acceleration. im waiting on a teardrop setup so have no air filter on at the moment. i know its not coll but i have hardly ridden it, just for the tuning process etc. i have some stainless mesh that i picked up somwhere and its very fine but gives adequate air draw so im going to fix a bit over the throat to stop shit getting in so i can have a bit of a ride. i dont fully understand the meaning of " shrouding the bowl vent " i get it in principle with turbulance and air flow.... but in practice not really. can someone please explain how this can best be achieved whilst using the mesh. can i , cant i and how if i can. thanks boys.
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  #69  
Old 10 Hours Ago
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I suggest looking into the enrichner. Maybe some slack in the cable would cause it to not operate correctly. Using the Mikuni "choke" cable, there is a rubber boot that slides down over the black plastic screw in fitting where it goes into the carb.
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