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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 25th November 2021
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Originally Posted by RicThompson View Post
I'm throw this out there cause I don't know the answer and it may be something to consider. If you are using early cases I assume you are using the early electric starter? Or is this kick/roller start only? Wouldn't a compensator sprocket be used?
I'm planning on using the electric leg and will add a kicker just in case.

Planning on using a TechCycle unit down the track.

I have a compensator setup to go on there.

Mo longer planning on racing this engine. Going into a road solo. XR Style.
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  #22  
Old 25th November 2021
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Originally Posted by Hippysmack View Post
Do you have a groove in the bore for the middle race spacer?
I never installed the crank in the bottom end. It came to me as a mostly complete engine.

It had the transmission installed but no primary or clutch.

No valves springs, push rods or even rocker boxes.

I have been putting off doing this engine as I thought it was going to be a lot harder than it's turning out.
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  #23  
Old 25th November 2021
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Ferrous, depending on the vintage of the parts, sprockets will slide on with alarming ease. Instead, the S and S shafts are hardened well, so you have zero fear of torquing the sprocket nut smartly. More recently made parts are a much tighter fit. I got to service a bunch of older S and S assemblies recently and the fit was loose on all of them, compensator or solid. One was nos, so no wear difference. Still loose.

How do you get a compensator cam to live in a big inch motor? I'm Leary of using them in anything over 65hp.
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  #24  
Old 25th November 2021
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Yeah, the first sprocket I tried on there was pretty loose. But the compensator one was much better and I tried the sprocket on anothr shaft and it was very loose on there too.

Part of me is a bit worried about the comp set up. If this was going to be raced I would never consider it. But this bike is going to get ridden by "other people", meaning not me.

Some people have empathy with machines. Some (most) don't.

My youngest daughter has just taken up motorcycles. I can't dissuade her given my involvement with them. Until now I've had no one to leave anything to.

This will be an interesting, unique motorcycle for someone to ride. There will be nothing else quite like it in Australia.

She has already expressed interest in having a ride on my sidecar. Anyone willing to do that deserves something.

But, maybe I should just turn her loose on the P3 Solo when it's finished to she how she goes with that. And this will have electric start unlike my race bikes.

Starting these on the rollers puts quite a jolt through the drive train. I've been meaning to develop a remote starter for them. This Strociek engine has a primary cover set up for a remote starter.
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  #25  
Old 25th November 2021
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Most of the engines I've been working on in the last 15 years or so have had S&S wheels in them, new ones.
Given that I have to pull the primary every time I pull the gearbox I've had to do this a lot. It's not hard but mostly I have to use my sprocket puller. They almost never just slip off. And most of them need a slight tap on.

Other than Smith Brothers is there another way to source /8's longer push rods ?

Guess I could just sacrifice a stock set if I had the right tube. But no idea where I would find chromo tubing in the right size.
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  #26  
Old 27th November 2021
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Quote:
Originally Posted by Ferrous Head View Post
.

Other than Smith Brothers is there another way to source /8's longer push rods ?

Guess I could just sacrifice a stock set if I had the right tube. But no idea where I would find chromo tubing in the right size.
I make my own pushrods now.
7/16 diameter solid 7075 aluminum and use the stock Harley balls.

I believe the OEM's were solid 7/16 diameter 2014 aluminum.
Sifton and others used 1/2 inch diameter 6061 aluminum tube.

I have used the 3/8 diameter 4130 chromemoly DYI yourself a kit from Andrews products.
The quality of the ball end on these are marginal.
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  #27  
Old 27th November 2021
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Thanks Doc.

Reminds me I have a set of the bigger diameter Siftons one with one bent that would be an ideal candidate for rebuilding.

I can no longer run a lathe so need to get others to help me with all of this. But new rods isn't a big ask. I prefer the steel ones myself. But getting the material might be a problem. Last time I bought chroMo I had to buy a 9 meter length to get 3 feet of it !

Drove 40 miles to get it and then they charged me just to cut it so it would fit into my car.

Sometimes the cake isn't worth the ingredients.

And that bit broke on me at Symmons Plains. Never again.
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  #28  
Old 27th November 2021
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Maybe Andrews would sell me just the tubes.
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