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

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  #1  
Old 9th June 2009
tat2d2dope's Avatar
tat2d2dope tat2d2dope is offline
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Default New Cams Vs. Carb. Jets

i replaced my stock P cams with some andrews Y grinds.
now my bike is a lil peppier than before
BUT it's still lacking.
could i need to up my main jet, and my thunder jet jet.
the carb is a super E
i also have some really short pipes that have the lollipop mod.
changing pipes is not an option.

pic of the pipes.

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  #2  
Old 9th June 2009
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1976 XL 1976 XL is offline
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Quote:
Originally Posted by tat2d2dope View Post
i replaced my stock P cams with some andrews Y grinds.
now my bike is a lil peppier than before
BUT it's still lacking.
could i need to up my main jet, and my thunder jet jet.
the carb is a super E
i also have some really short pipes that have the lollipop mod.
changing pipes is not an option.

pic of the pipes.

Sweet ass tubes! Is their any leg interference? As for your Q about the jets, sorry, just using the S&S alone.
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Old 9th June 2009
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Sorry with those pipes it will always be lacking, they look cool as hell but but performance will suffer and tuning will be very difficult. You should read jetting 101 on here and follow it untill you get it close then get a dyno run with an AFR chart to check it.
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Old 9th June 2009
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The only way to know if bigger jets will help is to run scientific tests. With the current jets, are there specific signs that they are either too lean or too rich? One way to answer this is to do chop tests at various throttle openings, and check the plug condition each time. Also look for signs such as carbon buildup at the back of the bike, pinging, etc.

Ya, best to check out the jetting 101 as already suggested.
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Old 9th June 2009
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tat2d2dope tat2d2dope is offline
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well i just got off the phone with one of my friends who went to MIT and another motorcycle school
and now he builds buell race motors for a living.
he told me to get rid of my Badass pipes i made.
my plugs are on the lite beige color so i need to up the main jet size a lil right now i have an .76 in it.
i'm looking at the paugho up sweep drag pipes.
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  #6  
Old 9th June 2009
jpironhead jpironhead is offline
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Quote:
Originally Posted by tat2d2dope View Post
well i just got off the phone with one of my friends who went to MIT and another motorcycle school
and now he builds buell race motors for a living.
he told me to get rid of my Badass pipes i made.
my plugs are on the lite beige color so i need to up the main jet size a lil right now i have an .76 in it.
i'm looking at the paugho up sweep drag pipes.
Your friend is a smart fella. Someone else had the same advice here too. Try 1.75" drags starting @ 40" long. Those you can tune. Those you can ride. That engine looks great, by the way. Nice build.
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