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Old 11-22-2009, 10:16 AM   #1
dvldg08
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Question Need help W/ K&N

I purchased a universal K&N (RU-2962) for my 90 model zx10 but when I give it throttle it bogs down? I was told all I had to do was swap out the airbox and mount the filters, is there some carb tinkering i have to do.
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Old 11-22-2009, 10:22 AM   #2
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My guess is your getting to much air. Some adjustment is probably in order. If you dont have any exp. adjusting carbs take it to a shop, and have them jet and adjust everything for the mods you have on there.
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Old 11-22-2009, 10:23 AM   #3
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cool bike BTW
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Old 11-22-2009, 10:28 AM   #4
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It's WAY too lean. On that bike you will need to install a jet kit and have it properly jetted.
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Old 11-22-2009, 10:31 AM   #5
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+1 to japawhat. probably too much air. if thats the case you need to be re jetted. But just in case, jump in there and check for any vacuum hoses that may have come off, or maybe you forgot to re connect. Maybe put your other filter back in just to check if thats it for sure.
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Old 11-22-2009, 10:33 AM   #6
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Quote:
Originally Posted by dvldg08 View Post
I purchased a universal K&N (RU-2962) for my 90 model zx10 but when I give it throttle it bogs down? I was told all I had to do was swap out the airbox and mount the filters, is there some carb tinkering i have to do.
An engine is basically an air pump. By changing air filters you increase the airflow INTO it.
Based on your sig photo it has at least an aftermarket can, maybe a full exhaust system. That increases airflow OUT of the engine.
What that means is your engine could be running very lean, in which case you will likely have to buy larger carb jets (a "jet kit"). A reasonable place to start would be 2 sizes up from where you are now.
After that you may have to resort to the black and mysterious art of sparkplug reading to determine fine adjustments to the fuel mixture.

When it bogs is it just as the engine starts to accelerate from idle or is it higher up in RPM?
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Old 11-22-2009, 10:35 AM   #7
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Patrick as always will be the final word on this or any other mechanical issues. Listen to his advice.
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Old 11-22-2009, 10:53 AM   #8
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Just installing a filter usually won't lean it too much. In this case you've completely removed the air box and went to pod filters which dramatically adds more air.
I believe Dynojet stIll offers a Stage 3 kit fir your bike, you'll need that and a bit of tuning to properly get it jetted.
Also, what did you do about the crankcase breather hose that went to the air box? You'll want to install something like a K&N breather filter in it.
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Old 11-22-2009, 11:28 AM   #9
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Like Patrick said, you are getting a lot more air and it has altered the air/fuel ratio. When going to pods the effect is often most noticeable at lower rpm where the pilot jets are overwhelmed. You are going to have to increase jet size on both the pilot and main jets and probably adjust the idle mixture a little. If you like taking carbs off/on several times and replacing jets and road testing between swaps then you'll have fun. If not, then take it to someone like Patrick and have them re-jet it.
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Old 11-22-2009, 12:14 PM   #10
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So basic what they are trying to tell you man is that your B*tch is sucking to much and you need to grab by the pig tails and give her some more fuel. That about cover it fellas?
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Old 11-23-2009, 10:58 AM   #11
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Thanks for all the info guys, Patrick you will be seeing me shortly.
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