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

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  #11  
Old 1 Week Ago
kitabel kitabel is offline
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AFAIK the chamber radius is the same on all XL iron heads, the 3/32" extra width all around looks like a quench band.
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  #12  
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More info really is needed Monte.

I'm presuming these are the heads you had rebuilt last year. And I presume you've been riding the bike for a while without issues.

The most likely scenario is a missed shift and over revving. It's quite possible to clout the intake but to not bend it. Depends on how hard it hits. If it tipped the valve it will leak and you would have been down on compression on that cylinder.

R valves are a tad longer an intended to be used with cams with a smaller than stock base circle. But again, I would presume this was taken into account and checked during the engine build.

If a tappet adjuster came loose it could possibly lead to clearance issues. I've never had it happen to me though.
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  #13  
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* I thank everyone for their reply, the engine was kicked THRU in the garage when the pistons kissed, cam cover was never removed, since that time another set of heads were built , coil bind and free travel checked , as was Static Compression’, the .436 Sifton Cams timing was checked, I Clayed the top myself and assured sufficient clearance, ( I go for start this weekend) I am not on this forum much lately , The forum continues to be a great source of info , I see many familiar names here , on the East coast the Oley PA AMCA rally will be in 2 weeks, after this insane 2020 year it will be great to get out and to see old friends , thanks and ride safe
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  #14  
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If it's the intake cam position, advanced 1 tooth may cause a crash and will greatly increase CCP.
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  #15  
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Not 100% sure of what your saying here.

But, if your saying nothing was changed since checking static compression and they didn't touch then, it's unlikely to be cam timing. But on a kick through cam timing or tappet adjustment are the two most common problems.

But if your telling us the engine hasn't run since the head work I would have to guess the intake valve might have stuck in the guide.

I think these had new seats ? Anyway, major surgery in this area means new guides and the need to be honed to fit after installation. Possibly done just a bit tight.

But if your saying the valve hits every time you kick the engine through now you really need to check cam timing again.

I have a degree wheel set up to do mine. Without that you'll have to pull the cam cover.

But another possibility. If the engine hasn't been run in this configuration you cannot be sure of anything. Even the cam timing marks become suspect.

So, has the engine run since the new heads went on ?
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  #16  
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Oh - almost forgot.

I get no ad pop-ups or other tom foolery. But it might be because I'm a paid up forum member. I feel the info I get from here every year is worth far more than the bucks I pay.

Do you have any idea what it costs to go to ANY school today is ?

Let alone one that teaches you something you want to know. By people like yourself. About things you want to learn ?

If they did this course at MIT it would be 4 grand semester.
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  #17  
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Physics don't lie. And they are never wrong.

If your going to start playing around with cams, valves, tappets, pisttons etc you need some basic tools to help.

The sportster crank has a thread on the sprocket shaft that just makes making an adapter dead easy. Degree wheels are actually quite cheap. The adapters aren't complicated and can be made from aluminum.



On some of my engines I have the advantage of not having to remove the primary cover but that's no big deal.

This and a piston position indicator will tell you an amazing amount about your engine.
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Physics don't lie. And they are never wrong.

So, when I make a comment and tell you it's physics, it must be right?
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The science of Physics is the most basic, fundamental of all science. Everything is based on Physics. It has historically been amoung the most difficult of academic subjects, along with Pure Mathematics. Physicists, OTOH, are people just like us, and they can be wrong

EDIT: Except for Stephen Hawking and Enrico Fermi
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  #20  
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Hold everything.

Turns out, we might have some things wrong about physics.

Some are now postulating there is a 5th unknown force affecting things which may alter our understanding of physics.
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