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Originally Posted by jsmeltser
I have a 2008 GZ250 that I've put 3500 miles on this summer. Lately, when I start from a cold start there is a loud popping noise that seems to come from the front of the bike and then when I give the bike gas I get the same sound until it warms up.
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Could it be just the pipes heating up and expanding? Hope so.
If that's what it is, your header bolts might be a little loose.
If you check them, be careful; they should just be snug, not TIGHT.