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Evo 4T Banging Through The Exhaust


trialholic
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"Bang"? Like a loud popcorn popping sound? Perhaps several in a row? If so, this is a common sound when shutting down the throttle on the Evo 4t, especially when going down an incline. My only sugenstion is to ensure your jetting is set correct. I had to adjust my pilot and main jet as the bike was too lean and the popcorn sound diminished a fair amount. The air boots on the carb are "hard fitting" and the front boot can shimmy back causing an air leak. So, double check that fitting and don't over-tighten the boot clamp as it will cut through the boot in a short time if too tight.

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Thanks guys! :icon_salut:

it was an air leak between the carb manifold and the carb union hose, the hose clamps were too loose and the carb was a little backwards. I pushed the carb in place, tighten the clamps a bit and... problem solved! :)

Edited by trialholic
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