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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 2 Weeks Ago
RicThompson RicThompson is offline
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What are you building this bike for, street cruising or racing? If street cruising don't waste your time and money on dual plugs. As far as cleaning up the ports is concerned go for it. I don't care if you're building a Briggs and Stratton lawn mower motor cleaning up the ports will always be of a slight increase in performance somewhere in the rpm range. Cleaning up does not mean reshaping, it is removing casting slag, blending port into valve seat and fitting intake manifold. If tools are available polish the exhaust port and texture the intake. Again build the engine for the purpose.
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  #22  
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One suggestion I would make when you gt your heads back is to oil them immediately and liberally. When I got mine back I had no idea they had been cleaned so well there was no oil on them, and I got some surface rust which comes right off with an oily fingertip, but still. Kind of aggravating as indie didn't say anything about that.
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  #23  
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Staffords Staffords is offline
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Quote:
Originally Posted by mrmom9r View Post
At that compression ratio all you will gain by dual plugging is complexity.

Oh, and maybe 1 or 2 hp.

Your plan sounds fine to me.
Thank you. I was hoping you'd chime in.

Quote:
Originally Posted by RicThompson View Post
What are you building this bike for, street cruising or racing? If street cruising don't waste your time and money on dual plugs. As far as cleaning up the ports is concerned go for it. I don't care if you're building a Briggs and Stratton lawn mower motor cleaning up the ports will always be of a slight increase in performance somewhere in the rpm range. Cleaning up does not mean reshaping, it is removing casting slag, blending port into valve seat and fitting intake manifold. If tools are available polish the exhaust port and texture the intake. Again build the engine for the purpose.

The bike will be used for some spirited riding on short trips and maybe some dirt road riding. 9:1 compression, magneto ignition, and probably a 19t front sprocket for a little extra fun off the line. I realize the headwork isn't necessary by any means but the heads are getting new valve seats anyways might as well have the work done while it's all apart.
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  #24  
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Iron Mike Iron Mike is offline
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Sounds to me like the 19T is going to be the best return for smiles per mile for your plan. Save the dual plug money and spend 2% of it on an 18T for the big grin dirt riding days! Screw on the tire and drop the pressure on those days for some real grins!!
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  #25  
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No, No, NO.

That's a VERY dangerous place to ride a motorcycle. I have seen the insurance statistics.
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  #26  
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Iron Mike Iron Mike is offline
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Insurance salesmen are great for traction...
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  #27  
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Plus one on the 18 and the dirt.
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  #28  
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Well, maybe it's just because I'm hopeless in the dirt.

I did try but it seems that more power in the dirt just makes me crash faster.
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  #29  
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RicThompson RicThompson is offline
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I have an 18 on the trans, 48 on an 18 inch wheel. Happy spot is 55 mph. Goes from happy to apeshit at 60. lol.
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  #30  
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Quote:
Originally Posted by RicThompson View Post
I have an 18 on the trans, 48 on an 18 inch wheel. Happy spot is 55 mph. Goes from happy to apeshit at 60. lol.
I've never run 18t front sprocket but I've run a 19t with the standard 51t drum on my old 78 XLCH. Plenty of giddyup and still cruised well at 60-65.
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