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

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  #31  
Old 24th September 2020
Iron Mike Iron Mike is offline
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Sportster/Buell Model: xlch
Sportster/Buell Year: 1964
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Sportster/Buell Year #2: 1971
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That’s an odd one.
That would be a hard one to catch. At least your assembly skills are validated.
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  #32  
Old 24th September 2020
needspeed needspeed is offline
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So far I've found that the part number for nose cone sportster and nose cone shovelhead point cam is the same. So no idea what you've got. Maybe a manufacturing error by the factory or after market?

This thread has pictures of an aftermarket vertical circuit breaker that appears to use some parts from the later nose cones. Points, condenser and advance weights that are used upside down because it turns in the opposite direction. So maybe the oddball point cam you have goes to this? Don't know, just thinking- wondering.

http://xlforum.net/forums/showpost.p...59&postcount=1

Good job figuring out what was wrong.
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  #33  
Old 24th September 2020
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Thanks for the kind words.
As for the part...im not sure. It came with some parts I got second-hand, one of which was the rivera advancer. I used it because it was with the rivera advancer, so I figured "looks new, I'll go with it"
I'm gonna put it in a bag, and be sure to label it "do not use"
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  #34  
Old 24th September 2020
Iron Mike Iron Mike is offline
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I’m with Needspeed in not knowing what use there would be for a cam with that orientation. Perhaps the pic provided comparing the two could be added to the appropriate documentation area in the stickies. Unless of course someone would happen to know where it could be used. This would at least point out the fact that cams with this orientation are out there, and give a reference to the correct direction.
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  #35  
Old 25th September 2020
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Heff: Reputation points to you for tenacity!

Enjoyed this thread...a lot of great input.
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  #36  
Old 25th September 2020
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Quote:
The instructions I found on the wiseco site says .003" piston wall clearance.
Ok. But a big can of worms. Clearances will be determined by material and use. The latest high silicon content cast pistons cannot be compared with much earlier pistons or forged pistons.
In use, both types of pistons will expand with the heat and running clearances will "mostly" be the same. Forged pistons generally use an alloy that expands a lot more than the cast versions. So they generally require more clearance. And an engine running WOT will generate more heat than a cruising street engine.

You mentioned that these pistons are 20 years old. If you are looking at the web site they might be referencing their current stock. The alloys may (probably are) different now.

I'm not saying this is a problem but I would probably shoot an email to tech support giving them the item number on the box. Just as a precaution.

OK. ignition cam. Don't know what to make of that.
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  #37  
Old 25th September 2020
needspeed needspeed is offline
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The two aluminum alloys most commonly used to make forged pistons are 4032 and 2618. Because the 4032 has a much higher silicon content it expands much less than the 2618.

Wiseco ironhead pistons are made from 4032 and their recommended clearance is .003" for normal use. Yes, If used for racing a bit more clearance may be needed.
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  #38  
Old 4 Weeks Ago
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I've never seen a cam like that? Somebody ground the flat on the wrong side? I have seen some aftermarket cams that were slightly off and you couldn't turn the point plate far enough to time it? In that case you either had to make the slots longer or replace the cam? I always try to use original Harley cams if you have one? This is why electronic ignition is better!
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  #39  
Old 4 Weeks Ago
GA_Ironhead GA_Ironhead is offline
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Looks like you may have found the third bad cam lobe...

http://xlforum.net/forums/showpost.p...04&postcount=9
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  #40  
Old 4 Weeks Ago
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OK. That makes sense.

China is about 1/2 around the world from the USA.

The circumference of the world is 360 degrees. So, 180 out !

I can see why they would need to do that.

And anyway, the drawings they were working from would have been in ENGLISH. The Chinese write from right to left !
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