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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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big bore kit, cams, timing

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  #1  
Old 27th December 2014
Willcmoore Willcmoore is offline
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Default No new go. (Delayed Response After Conversion)

Ok, a little help on this one please. I finally upped the game to a 1200 big bore kit and N2 cams. It went pretty smooth and no hang ups. Problem is when I accelerate, there is a delay in "go". I'm not getting response I expected, it's taking awhile to build up speed. Is it the timing, or fuel delivery? The valves are in great shape, for having 35,000+, miles on them (I did have to clean them up a bit). There is no apparent leak of oil or air. I'm a little stumped, and try to avoid pulling the cam cover off to re-inspect the cam timing, cause I'm pretty sure I got that right. It seemed to idle like it should, but it's under load that seems to be a problem. Any ideas or advice would be greatly appreciated.
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  #2  
Old 28th December 2014
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If you're still using the 883 Ignition Module -- You need to change out that module to a 1200 version in order to have the right timing and advance.... Or purchase a newer programmable module that is compatible with the 1200 build...

If you haven't re-tuned the CV carb, you should really start from scratch and do that as well --- after you have the right control module...

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  #3  
Old 28th December 2014
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On my 2005 883 conversion I used 497 cams and 9.5 to compression and made no ignition changes. Even the stage 1 jetting remained the same. Performance was perfect with no hesitation anywhere. Some have timing problems, but your changes sound similar to what I had. Hopefully your cams are aligned OK.
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Old 28th December 2014
Willcmoore Willcmoore is offline
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Quote:
Originally Posted by IXL2Relax View Post
If you're still using the 883 Ignition Module -- You need to change out that module to a 1200 version in order to have the right timing and advance.... Or purchase a newer programmable module that is compatible with the 1200 build...

If you haven't re-tuned the CV carb, you should really start from scratch and do that as well --- after you have the right control module...

....~\
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Thanks IXL2Relax, I was afraid of that answer. The shop I bought my kit from said that I shouldn't need to do that when I purchased it. So, I wasn looking forward to the cost of a new module. After some more research, It's the only thing that makes sense. I'll let ya know how it goes for me. Thanks again.
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  #5  
Old 28th December 2014
Willcmoore Willcmoore is offline
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Quote:
Originally Posted by ed_in_az View Post
On my 2005 883 conversion I used 497 cams and 9.5 to compression and made no ignition changes. Even the stage 1 jetting remained the same. Performance was perfect with no hesitation anywhere. Some have timing problems, but your changes sound similar to what I had. Hopefully your cams are aligned OK.
I used Andrews N2 bolt-on cams. I was 100% sure they were set right (I did it twice to be sure), but since there is hesitation I'm starting to doubt my self. But, I'm sure I would have other issues as well if they were wrong.
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Old 28th December 2014
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Quote:
Originally Posted by Willcmoore View Post
I used Andrews N2 bolt-on cams. I was 100% sure they were set right (I did it twice to be sure), but since there is hesitation I'm starting to doubt my self. But, I'm sure I would have other issues as well if they were wrong.
Are you talking about reversion?
I have the N4s. There is a hesitiation at 2500-3000 then it kicks in and blasts off
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Old 28th December 2014
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Quote:
Originally Posted by Willcmoore View Post
I used Andrews N2 bolt-on cams. I was 100% sure they were set right (I did it twice to be sure), but since there is hesitation I'm starting to doubt my self. But, I'm sure I would have other issues as well if they were wrong.
I'd do a Compression Check - It's the first thing I would do after any cylinder/head/cam upgrade - It's the quick way to see that all those moving parts are in the right orientation, timing-wise, to make the necessary compression for combustion... For less than $30, you can get a functional compression gauge and the readings you take now can be used for comparision to later readings to check how the cylinder/pistons are wearing over time...

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Old 4th January 2015
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Ok, an update since last post. I did a compression test, getting 120 p.s.i. Which is what I'm figuring a ratio of about 9.5:1. Also, I purchased and installed the Dynatec ignition module. I've been playing with it for a few days and trying to figure the best setting for it. It still feels like it's not quite right, not taking off like it should. Barely twisting the throttle, and it climbs on its own slowly. Anybody have experience with this? Or any suggestions or advice about advance and rev limit?
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Old 5th January 2015
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That seems a little low - but I'll let others comment on that....

As to the carb, did you check the accelerator pump? Did you set the idle with the throttle plate in the right place so the Transfer Ports kick in when you open the throttle?

Did you have the carb torn down? What Idle & Main Jet are you using? Needle?

Did you possibly put the needle jet in upside-down?


Maybe a Map Sensor issue? Did you check to see if you have any codes on the Speedo?
( http://donscycleware.com/hadaspercoan.html )

Which Dynatec model and what settings are you using? I'm sure someone else has used that model and can comment on those settings....

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Old 5th January 2015
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I didn't do anything with the carb during this upgrade, a couple years ago I upped the jet to the largest size (I don't remember size) and my buddy "bored it out" a little bit due to a coughing and stalling issue. Otherwise, there was no issues with it pre-upgrade. There was a code on my speedo when I first had the module set in the "C" group, but after dialing it down it it went away, and I don't remember what it was. I didn't document it. I've tried different setting on the module, rode it around a few miles to see if it needed to learn itself. Everything I've read states that for this upgrade, most set the rev limiter at or near 7000. After all that, maybe it is time to rebuild the carb. Start with some new jets.
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