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Oct 21st, 2007, 07:39 PM
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#1 | | Very Active Poster 50+
Join Date: May 2007 Location: Whitehall, Pennsylvania
Posts: 62 Model: 06 sportster 883/1250 Interests: riding and computers Occupation: Technical Assistant
| Sporty stock rpm rating
Hi Everybody,
I got to wondering my 06 883 sporty is rev limited at 6.000 rpms, since i have Ken's stage 1 and pipes and highflow A/c this thing pulls right up to the rev limiter very quickly thru the first 3 gears with every indication of having a lot left beyond the 6k. I saw the MoCo has a emission legal Screaming Eagle ignition for this bike and the only difference between my stock ignition and it is the RPM limit, 7000 for the Screaming Eagle. Can the stock valve train handle the extra 1000 rpm without any work such as heavier valve springs etc. Also i do not know if i would buy this particular unit, there are alot others out there.
Tim | 
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Oct 22nd, 2007, 03:04 AM
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#2 | | Has posted 500+
Join Date: Dec 2006 Location: Stanton, NJ
Posts: 1,378 Model: 04 Dyna WG (with a 240 rear tire) Interests: Harleys, drag racing, family, fishing, my rottweilers, the UFC Occupation: Carpenter/Builder
| What's the need to go past 6K rpm anyway? There's no extra power at that rpm range with a stock bike, and you're tempting fate. (just asking) BTW, I would assume the stock valve train would handle it, although I'm not positive. | |
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Oct 22nd, 2007, 06:45 AM
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#3 | | Has posted 500+
Join Date: Feb 2007 Location: middleburg, pa
Posts: 713 Model: 06 FLST hertiage, stage 1 1450 pc111 Interests: hunting,wood working Occupation: medical asst. tech/DPW
| probley should think about heavier valve springs, might start having "valve float" not sure about the rest of the engine  | |
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Oct 22nd, 2007, 08:56 AM
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#4 | | Very Active Poster 50+
Join Date: May 2007 Location: Whitehall, Pennsylvania
Posts: 62 Model: 06 sportster 883/1250 Interests: riding and computers Occupation: Technical Assistant
| Curiosity,I am just trying to figure out why they would sell an emissions legal ignition that only changes the rpm limit to 7k and keeps the stock advance curves the same as the stock unit.I think MoCo's intent would be to install it on a stock bike because it is emissions legal. Thus the question can the 06 883 engine handle the extra 1k of rpm with out any mods to the valve train?
Tim | |
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Oct 22nd, 2007, 09:37 AM
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#5 | | Administrator Frequent Posting Club
Join Date: Jan 2005
Posts: 1,544 Model: Harley FLHX Interests: Harley's, Saltwater fish tanks, and inventing new ways to keep busy. Occupation: Web Specialist by day, 25+ years of carb building by day, hey what happened to my day?!
| I recall hearing that this SE ignition keeps the same stock curves down in the lower RPM range but up higher is where it might pick up a little bit. The evo sporty engine can handle the higher revs but I don't think you will find (or feel) any extra power that high up. It might be worth it to pull out a couple extra rpm but I wouldn't run up to the full 7000.
Just a bit of speculation, but maybe the Moco probably keeps the rev limit down on their factory models to keep people from over revving before the engine gets broken in. Otherwise the urge to max it out on the first day could tear up the motor before it had a chance to get everything seated.
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Enjoy the Ride!
Ken
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