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Tank swap
Last Post: Grymy
Posted On: 1 Hour Ago
Replies: 7
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9th June 2009
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Senior Chief Know It All 1st Class
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Join Date: Apr 2008
Location: in the garage
Posts: 1,165 Sportster/Buell Model: Sportster 1200 Sportster/Buell Year: 1999 Other Motorcycle Model: Shovelhead Other Motorcycle Year: 1976
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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.
__________________
1973 iron head sportster fully customized the stock frame
SOLD for 76 shovelhead and $5000
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9th June 2009
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Senior Chief Know It All
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Join Date: Sep 2008
Location: Southeast Oklahoma
Posts: 885 Sportster/Buell Model: Sportster XL Sportster/Buell Year: 1976 Other Motorcycle Model: Springer Softtail Other Motorcycle Year: 89'
Reputation: 155
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Quote:
Originally Posted by tat2d2dope
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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Sweet ass tubes!  Is their any leg interference?  As for your Q about the jets, sorry, just using the S&S alone.  |
9th June 2009
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Master Custom Bike Builder
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Join Date: Feb 2007
Location: northern IN.
Posts: 3,336 Sportster/Buell Model: 1200R 90+HP Sportster/Buell Year: 2004 Sportster/Buell Model #2: 2276cc VW sandrail Sportster/Buell Year #2: 1976
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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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04 1200R 90+HP/10.5-1 SE pistons/.536 cams/Heads by MR T/mikuni HSR 42 w/25 pilot, 96 needle, 170 main/TC88A ignition w turbotas mod 33 map pos.4/ Supertrapp 2-1 w 23 disks/ 28T FRONT PULLEY /NRHS Hurricane A/C & adj. pushrods /progressive 440 shocks & fork springs w/10 OZ SE fork oil
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9th June 2009
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Rider Of The Iron Steed
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Join Date: Dec 2003
Location: London, ON Canada
Posts: 31,154 Sportster/Buell Model: XLH Sportster/Buell Year: 1978
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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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9th June 2009
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Senior Chief Know It All 1st Class
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Join Date: Apr 2008
Location: in the garage
Posts: 1,165 Sportster/Buell Model: Sportster 1200 Sportster/Buell Year: 1999 Other Motorcycle Model: Shovelhead Other Motorcycle Year: 1976
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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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9th June 2009
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Chief Know It All
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Join Date: Jun 2009
Posts: 407 Sportster/Buell Model: XLS Sportster/Buell Year: 1979
Reputation: 164
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Quote:
Originally Posted by tat2d2dope
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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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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