I have a JDM B20b with no timing gear or pulley. I have a b20b4 that i took the pulley off no problem and i cant get the gear off of the crank. the key is out but the gear itself if stuck on there once it gets near the end. i have a gear from a b16 and GSR all look identical except the b20b4 that i cant get off has a bigger gear around the back of it. The b16 and GSR gear wont slide on however i managed to get it on a little before but it didnt seem to go on enough. Is there anyway i can get the b16 or GSR on there or would a b20 gear go on smoothly?