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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 5 Days Ago
73HEAD 73HEAD is offline
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Sportster/Buell Model: XLH
Sportster/Buell Year: 1973
Reputation: 159168
73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future
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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 5 Days Ago
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 5 Days Ago
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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 5 Days Ago
73HEAD 73HEAD is offline
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73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future73HEAD has a brilliant future
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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 4 Days Ago
73HEAD 73HEAD is offline
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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  
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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 2 Days Ago
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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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