Question about Harley Davidson XL Sportster 883 Motorcycles

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No low end response and cam (andrews n4) will not kick in until 4000rpm. Cv carb with dyno jet kit installed. Slow jet is 42, 170main and eclip is on 3rd groove.

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Look at new spark plug for colour after running 1/3 thottle

if clean or carbon

i susspect you have spark curve issues (timing) if changed the orginale cam shafts profiles

Posted on Aug 17, 2009


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I recently put a 95 C.I kit in my 2000 Road King, true duels and 203 screamining eagle cams, someone give me a suggestions on what jets to run in the CV carb?

Hi Joe, for more information about your question please visit the websites below. Good luck and have nice day.
Harley CV carb mod

Btw, I’m available to help over the phone in case u need at

May 13, 2012 | 2000 Harley Davidson FLHR-FLHRI Road king

1 Answer

TTR 225 2003. Starts great and idles good, choke when cold then when choke off still good. Pulls away fine but has a 'flat spot. Medium to high revs are fine, no problem but initial acceleration when...

Your bike has a CV carb. It is designed to give a more gradual rate of acceleration. What would help out to improve low end acceleration is to move the jet needle circlip to a lower notch. This raises the clip thus allowing an earlier flow of fuel at low end. All ya gotta do is remove the carb cap and then move the clip. Some CV carbs do not have multiple clip grooves. If yours doesn't the only other thing would be to check the diaphragm (power valve) and replace it if it's not working. The clip change costs nothing, the new diaphragm does cost for the part.tombones49_208.gif

Jul 05, 2011 | 2003 Yamaha TT-R 225

2 Answers


Try and get the carbs balanced .You may have one in need of adjusting .

Mar 17, 2010 | 2001 Harley Davidson FLHR - FLHRCI Road...

1 Answer


nope you will get about 28 with the tuning you did
mine never got anything better than that and i dyno tuned it more than once

Feb 16, 2010 | 2007 Yamaha Road Star

1 Answer

I have a 97 gsxr 600 bike has rebuilt 99 motor with 97 carbs DandD exhaust K&N filter and stage 1 dyno jet kit. it runs great over 3500 - 4000 rpm. It also idles very nice, very smooth. Sounds smooth...

if you had cam overlap then it wouldnt start and when you pushed the starter if would smash the valves together, if it runs ok every where else then i would say its a crab fuel problem and at that rev range it would be pilot jets as the mains dont come into use at that rev range you should take your bike to your local dyno center and have them run it up they will sort you problem

Jun 19, 2009 | Suzuki GSX-R 600 M Motorcycles

1 Answer

97 srad no power under 4000 rpm in, in first gear acceleration

If you have installed the Dynojet kit's carburetor needles take them off and use the stock ones.
Dynojet's needles are for track use only and the don't work properly under 4000rpm.

Jun 15, 2009 | 1999 Suzuki GSX-R 600

1 Answer

Large knock at start up.

All anyone is doing at this point is guessing on the jet size. With all the work you've had done I would go ahead and pay for a dyno tune up.

Apr 06, 2009 | 2004 Harley Davidson XL 883 Sportster

1 Answer

New pips

No.Although, it is a common practice to de-tune bikes at the factory so that they meet emissions requirements. All new injected HD's can expect a 4-6% increase in horsepower and 2-3% increase in torque just by dyno tuning the bike straight off the showroom floor. If you're riding a Low with a carb, then you do not need to have it re-jetted for slip-on's. If you're changing the exhaust from where it bolts to the engine, then yes you should. Dyno tuning is not as useful on carbureted bikes compared to injected ones, in fact I could tune a carbureted Low just as easily with an Exhaust Gas Analyzer as a dyno and save you $300. You're probably not that interested in minor differences in horsepower if you're doing slip-ons rather than a whole Screaming Eagle Stage 2 kit. Bolt 'em on and ride...

Nov 20, 2008 | 2005 Harley Davidson FLSTSC - FLSTSCI...

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