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

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  #21  
Old 19th May 2018
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is it because the carb is tucked in too close?? jpeg would be nice, if so, there is a solution
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  #22  
Old 19th May 2018
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The point is that the Mikuni fouls the underside of the “turtle” tank, which was still a standard fitting on Sportsters when the Mikuni conversion was first developed (late 1960s).

It doesn’t foul on Bikes fitted with the small tank, because the carb is outside the tank; but the original fuel valve is VERY close to the Mikuni carb, and sometimes fouls it.


So the full, original kit consisted of the dropped manifold, which lowers the carb by about half an inch; the original, cast manifold, which is longer than the modern rubber units; a rubber sleeve, and the carb itself. There may also be a Tufnol spacer to reduce heat and vibration transfer to the carb. This creates a small, but critical extra space around the carb.
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  #23  
Old 20th May 2018
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my branch kit manifold was non flange and connects with rubber coupler of which had several sizes for diff carbs.
it really saved me one night when i failed to make a curve, either slide in the gravel or take the corn field, anywho, did go down and carb popped off. put a little oil on the coupler and hand smacked it in and drove off.
the spacer was a nice addition and actually help more than just heat soak, it also created plenum volume. the other option is to make a longer manifold.

http://xlforum.net/forums/showthread.php?t=2067085
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  #24  
Old 21st May 2018
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45 Brit makes a good point about the Turtle tank. The carb hits the tank with a straight manifold. On my 66 the pervious owner raised the tank to fix this. I changed the carb and lowered the tank.

Back in the seventies, I sold and installed dozens of 38 Mikunis on Sporties and Pans. The only problem was they tended to fall off the bikes. I recall one even when my dear departed partner blew his off his pan while we were going down the road. He put the bike in neutral, reeled the carb in by the throttle cable, and popped it back in the rubber sleeve without missing really slowing down.
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  #25  
Old 21st May 2018
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Originally Posted by Moon Wolf View Post
45 Brit makes a good point about the Turtle tank. The carb hits the tank with a straight manifold. On my 66 the pervious owner raised the tank to fix this. I change the carb and lowered the tank.

Back in the seventies, I sold and installed dozens of 38 Mikunis on Sporties and Pans. The only problem was they tended to fall off the bikes. I recall one even when my dear departed partner blew his off his pan while we were going down the road. He put the bike in neutral, reeled the carb in by the throttle cable, and popped it back in the rubber sleeve without missing really slowing down.
That exact thing happened when Simeli had the 70. We changed the clamp(aircraft) and hasn't happened since.
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  #26  
Old 21st May 2018
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This thread came at just the right time for me. Only problem is I don't know how to Identify a VM38. Is this one? No numbers on it but it looks similar from googling.


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  #27  
Old 21st May 2018
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yep, seven, that's the one.
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Old 21st May 2018
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Damn. And I thought my bike parts are dirty. Thanks for stroking my insecurities .

Edit: Yep. Looks like mine.

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  #29  
Old 22nd May 2018
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Quote:
Originally Posted by doodah man View Post
yep, seven, that's the one.
Quote:
Originally Posted by rokytnji View Post
Damn. And I thought my bike parts are dirty. Thanks for stroking my insecurities .
Thank you doodah man AND you're welcome rokytnji, that's what I'm here for
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