What size jets? - Honda TRX Forums: Honda TRX 450R Forum

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Old 10-04-2010, 06:34 PM   #1 (permalink)
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Default What size jets?

I have an '06 450ER. K&N air-filter, White Bros. slip on exhaust. About to get stage two cam and exhaust tape. I am not running an air-box lid, just outwears. I currently have a 180 main and stock pilot jet. I just put in the 180 from the stock 120 and it really woke up the quad. It still seems to be running to lean though. I think I need a bigger jet now. What happens when I get the cam and exhaust tape? Any suggestions on what size jets I should be running?
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Old 10-04-2010, 06:58 PM   #2 (permalink)
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A 180 is WAYYY to fat. Even with a cam (which doesnt really effect jetting much at all) you should be around a 162-165 main and a 45 pilot. If it is stumbling a little on top, its because you are too rich, not lean.
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Old 10-04-2010, 07:11 PM   #3 (permalink)
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^^ x2!!
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Old 10-04-2010, 07:39 PM   #4 (permalink)
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I have good power all the way around for what the bike has. I do not have lagging problems at any range. I have NO soot in muffler. It sounds way to crisp, and there is nothing on the plug. What is the stock pilot size? Maybe that is where my problem is.
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Old 10-04-2010, 08:18 PM   #5 (permalink)
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Quote:
Originally Posted by roughnecky2000 View Post
I have good power all the way around for what the bike has. I do not have lagging problems at any range. I have NO soot in muffler. It sounds way to crisp, and there is nothing on the plug. What is the stock pilot size? Maybe that is where my problem is.
Stock is a 42. You should probably try a 45 and lean down the main. That is really rich and is probably costing you power.
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Old 10-04-2010, 09:03 PM   #6 (permalink)
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you should have a 165 main. or close to that
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Old 10-05-2010, 11:06 AM   #7 (permalink)
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Listen to what these guys are telling you...a 162 or 165 is the proper range for your main jet....unless there is a variable that would require a drastic change fron Hondas recommendations....ie...altitude/temperature.
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Old 10-05-2010, 03:53 PM   #8 (permalink)
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X2 on all of the above...
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Old 10-05-2010, 06:56 PM   #9 (permalink)
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Thanks folks. Gonna go with a 165 and 45. Hope it helps.
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Old 10-05-2010, 07:04 PM   #10 (permalink)
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Let us know how it turns out.
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Old 10-07-2010, 07:45 PM   #11 (permalink)
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Runs like a champ. Sounds MUCH better, especially at higher RPM'S. Still bogs down a little if I dump the throttle off the line though.
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Old 10-07-2010, 08:19 PM   #12 (permalink)
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Runs like a champ. Sounds MUCH better, especially at higher RPM'S. Still bogs down a little if I dump the throttle off the line though.
Have you tried changing the leak jet to a 55? I think stock size is 75. The leak jet affects how much fuel is sent back into the float bowl by the accelerator pump. A smaller jet allows less fuel back into the float bowl which equals more fuel into the engine.
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