whenever im racing or revving my motor up to higher rpm maybe 5-6k when i shift or let of the throttle it backfires once then decels fine to about 1500-2k it pops and crackles til it idles,is this normal for rotary engines?or if theres something wrong id like to know! thanx

 

what exhaust configuration are you running?

 

stock with empty cats,it did it before i hollowed them out too if it should make a difference

 

there is probably an exhaust leak some where letting air in on decel. my car will shoot flames occasionally after i get the exhaust nice and hot, mostly b/c my carb is tuned pig rich at the moment, but it doesn't really ever back fire

 

air is getting in there somewhere - holes or broken welds.

 

alright.i had already replaced about 4 exhaust gaskets but i guess theres more work to be done! thanx guys!!

 

Misfiring at low RPM when returning to idle seems fairly normal for older-style rotaries (particularly so for ported ones). Is that what you're referring to? Either way, you obviously have exhaust leaks.

 

well as far as i know i was by the previous owner it was ported,who had bought the motor with around 58k miles on it from a wrecking yard so yea another reason i think its ported cause i get worse mpg than my friends stock fb....im getting around 13-14mpg,sound right to u? im somewhat a rotary noob being my first rex and all.so im trying to figure it all out.