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Sportster Motorcycle Engine Conversions Advice, questions, and tips for 1200, 1250, 1340, 1450 etc... for Sportster and Buell motorcycle engine conversions

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View Poll Results: Have you converted your 883 to a 1200?
883/1200 conversion is done 518 37.56%
I haven't done the conversion, but plan on it 525 38.07%
I plan on leaving my 883 as it is 147 10.66%
I am still undecided 189 13.71%
Voters: 1379. You may not vote on this poll

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  #381  
Old 15th December 2018
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Quote:
Originally Posted by sportsterdoc View Post
You could have a 1200 or 600, if you just pull one spark plug!
There used to be "Half Harley's" running at Speedway. They plated the rear jug hole and ran one jug in the front. Must have been 1000's, because Speedway is 500cc. In general they didn't seem to do well, but that's relative to the rider in a major way. If Eddie Castro (Fast Eddie) sat on one, I'm sure it would be up front. That boy used the entire track and the wall, amazing to watch.
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  #382  
Old 16th December 2018
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now that is funny.
now back in the day, i used to get my drinking money by swapping cylinders.
first, you have to know your targets, hd was king back then by displacement but rice half the size could be a challenge.
anywho
we would make the run and then i offered double or nothing and he could swap my plug wires, never missed. we all know the out come.
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  #383  
Old 4 Weeks Ago
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Sportster/Buell Model: xl 883 Iron
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I was just wondering how much the timings differ from 883 to 1200/1250/1275...
I.E.
how much exactly the initial advance has to be retarded...
coming from 883 to stock OEM 1200 could be easy... since i guess you should copy a stock 1200 tune
things become more complicated with kits and high compression pistons

with AFRs you can always play
the same is a bit dangerous about timings
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Last edited by Nibelungen; 4 Weeks Ago at 14:42..
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  #384  
Old 4 Weeks Ago
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Sportster/Buell Model: 1200R
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Quote:
Originally Posted by Nibelungen View Post
I was just wondering how much the timings differ from 883 to 1200/1250/1275...
I.E.
how much exactly the initial advance has to be retarded...
coming from 883 to stock OEM 1200 could be easy... since i guess you should copy a stock 1200 tune
things become more complicated with kits and high compression pistons

with AFRs you can always play
the same is a bit dangerous about timings
You could check with Rocketman or Rico. They have programed plenty of curves for various stages.
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  #385  
Old 4 Weeks Ago
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Sportster/Buell Model: xl 883 Iron
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Thanks
My point was another though...
I was wonder...
Either the manufacturer who sell the conv kit tell you the exact timing to set for the kit (like some do)... or otherwise you are exposed to errors even if competent mechs work on the assembly...

Maybe i'm only conditioned from experiences in my youth...
but that's it
I had a lot of conv experience when kid... on Vespas...
i spent dozen of hours in garages or workshops of friends who wrenched on their ride...
Back then in Italy there where hundreds of kits since 9 guys over 10 bought a Vespa... (80 cc, 105 cc, 175 cc, 200 cc, plenty of aftermarket flywheel rotary valves, clutchs, gearing, dozen of carbs, filters, exhausts etc etc)

very few of these kits did the same mileage of a stock...
i saw many interesting things...
broken connecting rods...
pierced or scuffed pistons...
shaved shaft keys...
thing like that for the most powerful kits
True
we were all kids... but even prof mechs assembled once in a while...

Last edited by Nibelungen; 3 Weeks Ago at 19:54..
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  #386  
Old 4 Weeks Ago
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The stock HD ignitions, up to 2003, could have the intial starting point for the curves adjusted by rotating the Cam Sensor Plate (CSP)... After that, 2004-later, it requires computer control by the dealer because the HD modules are not user programmable...

Of course, rotating the CSP does not address the shape of the curve... This was not user programmable by any means on any of the HD modules...

This is why conversion kits should recommend programmable aftermarket ignition modules that can control the timing (both initial and curves) to achieve the best setting for the conversion being done...

Previously, doing a simple conversion from 883 to 1200, using some or all of the stock 1200 parts, allowed swapping the 883 stock HD module for the equivalent stock HD 1200 module and you'd be in the right ball park. But if you made any changes (cams, compression, headwork) you'd be right back to the problem of timing to match the conversion...

Even for stock models (no conversion), it was not uncommon to change the timing a bit to find the best initial point to more closely match your specific engine, carb, exhaust requirements...

In the end, using any stock HD module is less desirable than a programmable aftermarket module if you are trying to get the very best settings for your particular bike. HD has always had the burden to create settings that are universal rather than specific, which individual owners should take into account. Using stock HD modules may be a compromise / trade-off that is acceptable to some for economic reasons...

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