2005 trx 400ex w/ 440 big bore kit - Honda ATV Forum
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post #1 of 16 (permalink) Old 06-25-2019, 02:24 PM Thread Starter
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2005 trx 400ex w/ 440 big bore kit

Greetings everyone! I am working on my 2005 trx400ex. I recently had a 440 big bore kit installed. The bike will crank for brief moments and barely idle. If I try to throttle it, it bogs out and is difficult to restart. I was told I need to rejett the carb, if so what jett kit should I use? Thank you!
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post #2 of 16 (permalink) Old 06-25-2019, 07:04 PM
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I have a hmf main and honda 42 slow jet in mine, runs fine. Iíve been told to stay away from dynojet. Keihin is what most people prefer


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post #3 of 16 (permalink) Old 06-26-2019, 05:01 AM
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Has it ran this way since the 440 kit was installed? Or did it run ok after the 440 for alittle bit?
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post #4 of 16 (permalink) Old 06-27-2019, 07:35 AM Thread Starter
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I tried the 42 slow jet, it idled but kinda high. I tried to adjust the fuel screw but it sat all the way down. What size is the hmf main
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post #5 of 16 (permalink) Old 06-27-2019, 07:38 AM Thread Starter
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The kit was 1st put on with just the piston and cylinder. It ran ok. I had the entire top end rebuilt and now it seems as the carb won't keep it running
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post #6 of 16 (permalink) Old 06-27-2019, 09:15 AM
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If it ran good before the rebuild chances are the "rebuild" wasnt done right. My bet is its a tooth off on timing. Carb tuning will make it run crappy. But to go from running to not running i would find it hard to believe the carb went bad at random. Unless the topend rebuild took a few years or something and the carb could have gummed up.
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post #7 of 16 (permalink) Old 06-27-2019, 07:11 PM
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Quote:
Originally Posted by XrMelTrx View Post
I tried the 42 slow jet, it idled but kinda high. I tried to adjust the fuel screw but it sat all the way down. What size is the hmf main


I have a 165 in it, might need a 170. What works for me might not be the best for you though.


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post #8 of 16 (permalink) Old 06-28-2019, 11:51 PM Thread Starter
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I cleaned the carb and went back with the 38 slow jet, now it's idling and running perfectly. Nothing smoking or leaking.
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post #9 of 16 (permalink) Old 06-29-2019, 05:36 AM
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Glad you got it figured out. But i forsee a blown headgasket in your very near future. There is 100% no way that 38 pilot jet is giving a 440 enough fuel at idle. I would bet my last dollar if you start it and let it idle the head pipe will be cherry red in no time.

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post #10 of 16 (permalink) Old 06-29-2019, 01:06 PM Thread Starter
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You sir might be psychic! Lol I think thats whats happening now. It ran perfectly yesterday, I rode it a bit more and now it's idling high again at times and my exhaust pipes seem to be getting hotter than normal
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