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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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  #1  
Old 16th April 2018
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Loony Loony is offline
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Default Running CVP velocity needle. shims?

Got some pics of what was and what is.....

This is what was in the bike when i bought it and it had the carb fart.

Don't know what needle it is but it had a plastic spacer 0.8mm



I then went for the CVP velocity needle without the plastic shim and this appeared to solve the farting.



I recently added some really short exhaust pipes and lost power which i live with but talking to a friend he said try a shim under the CVP needle and see if that improves mid range. TBH couldn't really tell but i guess better.
The shim is 0.6mm and he gave me 2. I have been running one but now have the fart back.



No shim but recess in slide.




Jets are at 45 pilot 185 Main. if i go any bigger on the jets i lose about 20 miles of range.
I have the CVP emulsion tube, the CVP needle jet, EZ mixture screw about 2 turns out.

I am running the stock rubber breather pipes that run back into the inlet manifold. Some say to modify this on the XLforum.

So my question is what, if any, shim should i be running?

Thanks
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Loony

2004 XL1200 Roadster - TC88A Jester 5. 5 IT - 8 AS (Thanks Rico) - EZ IMS - CVP Jet Needle - 45 pilot - 185 Main - K&N Airfilter - Short Drag Pipes (FMP's) (SEII Slipons OFF)

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  #2  
Old 25th April 2018
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Arrow

First, do NOT shim the CVP needle. This will do nothing for the hesitation (carb fart) problem you described on the other forum. Adjusting the EZ-Just out an extra 1/8th turn will likely cure the hesitation... that is if the passages are not clogged which you'll never be able to adjust around. Also remove any spacer that the previous needle used. That spacer shown is only to support the top of an adjustable needle in the spring retainer. On a stock slide with a CVP needle, no shims or spacers are needed.

It is hard to tell in that picture but I suspect the slide vacuum hole has been drilled. If you can slide a 1/8" drill bit into that offset hole, it is too big and you'll encounter issues. It was common years ago to drill them that large, some magazines even recommended it in articles. It was later found to cause more problems compared to the minimal throttle response gained. If that hole is too big, just replace it.

As mentioned in the other post, drag pipes are for sound and on a driver you'll always be battling to find any performance on the low end. If you can't baffle them, there is a trick to add a large washer on a bolt (think butterfly valve) in the path of the pipe where a baffle would normally go.

Did I mention No Shims?


CV Performance
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Old 7th May 2018
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Thanks for the reply, bike seems ok at the moment, No shims.
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