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XR650L Engine Brake Backfire

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Hello everyone,

I have a 2004 XR650L, mostly stock.  Recently it has started behaving strangely when i engine brake (as i do all the time).  When I engine brake for several seconds or more, and then open the throttle, the whole bike bogs down for a second, then backfires through the exhaust very loudly, then accelerates. Up until now the bike was running fine.  The only thing i've done was install the smog block-off kit about 2 weeks ago.  Does anyone have suggestions as far as potential causes or solutions? 

Thanks, David

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Update:  Found a smog blockoff cap was missing on the bottom of the carburretor.  Replaced with a new one.  Time to test!   :ride:

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Hi Barbarianbug - your last response is a good way not to get any help in the future - remember some members work and some live in different time zones - be nice to the members and they will be nice to you and they really are a fount of knowledge....  Pleased you found the problem.

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