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-   Carbs and Fuel System (https://www.vn750.com/forum/22-carbs-fuel-system/)
-   -   problem after rejetting (https://www.vn750.com/forum/22-carbs-fuel-system/14892-problem-after-rejetting.html)

niterider 05-30-2010 10:56 AM

problem after rejetting
I rejetted my carbs with a jetting kit from no one other then Lance. I let him know my altitude and the exhaust and no ears. Anyways after the installation I was having a problem with not reaching high rpms. At Lances advise I tried removing the EMGO filters. And still no change. I went throught the process of changing the jets and shims around, still a problem. However; when I removed the filters I did not remove the entire filter. I had left the rubber part on the carb inlet. This rubber part was causeing the problem. It partially covers the air ports at the mouth of the carbs. So what we did is go with what lance sent me and removed the entire air filter and wala, high rpms reached. I am waiting on my new K & N air filters. The moral of the story EMGO filters not good for this application.

VN750Rider/Jerry 05-30-2010 04:12 PM

It sounds like you were running to rich to begin with. If this happens with Emgo filters, but does not with K&N filters (and yes, I am a K&N filter hater from decades back), that tells me the K&N filters flow more air. I find it hard to understand how a filter can flow more air, and not let more dirt through as well. If you were running Emgo pod type filters, I think I would have rejetted to match them rather than changing to K&N filters. JMO, BTW. Not based on known facts, just speculation. Jerry.

niterider 05-30-2010 04:47 PM

The rubber part of the filter blocks off the flow of the air. It is like part of a funnel. That is the best way that I can explain it. Not saying it again.

lance328 05-30-2010 04:57 PM

Well Jerry if you read the post it was not running rich, the flange inside the rubber base on the Emgo filters were blocking the ports at the mouth of the carbs preventing vacuum to fully open the vacuum valve. I guess you just saw the K&N and went into K&N bashing mode. K&N's do not have a flange on the inside of the base, the base is the problem not the filter media.

If you read the post completely you would have also seen the we rejetted several times with the emgo filters with the same end result.

slimvulcanrider 05-31-2010 09:17 PM

another thing to think of on the K&N filter... imagine the filter element being a wool sock. it is very restrictive in airflow design... now take a set of nylons... same amount of filtration but much more breathable. also to help trap dirt K&N uses oils... with out the oils, yes they would let more dirt through... but oil acts like a magnet to dirt. I was skeptical of them as well when they first became popular, but after much testing in extreme environments, I have come to the conclusion that if I am going to be running a hi performance filter... its gotta be K&N... normal filters I run only wix.

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