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Discussion Starter · #1 ·
After the mods to my R (jetkit, pro-design airfilter - open airbox - ct pipe) we put it on the dyno, good gains - 43hp -. I took it out yesterday for the first time and did a proper off-road test on it but one thing bothers me, it backfires very hard/load when you come of the throttle or gear down, what is the problem?
 

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Discussion Starter · #4 ·
We are at 3800ft, jet is 165 (if I remember correctly from the guy that did the dyno)
Climate: Winter now, 15 to 23 d/celcius.

We tested again today and after my mechanic(best in the world) tightened the bolds on the exhaust at the engine the backfiring went down by 90%, if I look at the replies to my first query it sounds about right now.

We had a stock Banshee also today but it was absolutely no competision to the 450r.

Thanks you guys.
 
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