I'm a little perplexed about a friends bike. 2001 DRZ400E K&N filter White Bros. R4 slip on other than that I'm not sure, the bike is new to him and he dosen't know. Is there any condition that would cause the bike to lope or not idle evenly that is normal. It is also slow to return to idle I have the pilot screw backed out 3 turns so I know I need to go to a smaller jet. Could that be the whole problem? It is also scary fast (at least to me) seems like way more guts than my stock S model.