loud exhaust pop when starting - Honda TRX Forums: Honda TRX 450R Forum

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Old 11-03-2008, 08:00 PM   #1 (permalink)
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Sometimes when im starting my bike, while its still cranking it will make a really loud pop through the exhaust. It seems to be getting worce. its a 06 450er with hrc, twin air intake ring and filter, hrc jetting. lots of hard hours but still runs great.. could it be valves out of adjustment..
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Old 11-04-2008, 12:30 AM   #2 (permalink)
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I would check the decomp adjustment and the valve clearances.
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Old 11-04-2008, 08:05 PM   #3 (permalink)
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mine kind of does this, i think mine does cause cold weather and takes more cranks to start, and back fires once cause the fuel isnt burning. i think mine needs add alittle for fuel for the weather.
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Old 11-04-2008, 08:13 PM   #4 (permalink)
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Quote:
Sometimes when im starting my bike, while its still cranking it will make a really loud pop through the exhaust. It seems to be getting worce. its a 06 450er with hrc, twin air intake ring and filter, hrc jetting. lots of hard hours but still runs great.. could it be valves out of adjustment..[/b]
sounds lean, mabye getting worse with cold weather, bump your HRC needle down one notch, let me know how that works for you.

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Old 11-04-2008, 09:27 PM   #5 (permalink)
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Quote:
Quote:
Sometimes when im starting my bike, while its still cranking it will make a really loud pop through the exhaust. It seems to be getting worce. its a 06 450er with hrc, twin air intake ring and filter, hrc jetting. lots of hard hours but still runs great.. could it be valves out of adjustment..[/b]
sounds lean, mabye getting worse with cold weather, bump your HRC needle down one notch, let me know how that works for you.

Andrew
[/b]

would u not want to change the pilot to help the starting? that would give it more gas at the idle ckt where the needle change will give it more gas at the 1/3 to 2/3 throttle.

i would adj the fuel screw out a little, if that didn't work i would go up on the pilot a little.......just my .02
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Old 11-05-2008, 01:32 PM   #6 (permalink)
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thanks for the help, i'll try those suggestions this weekend..
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Old 11-05-2008, 01:40 PM   #7 (permalink)
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If you ae popping when starting, or/and on decel you should change the needle clip and the pilot. This will smooth out your jetting, and prevent a hesitation between your pilot control and your needle. Kehin carb chart
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