I got problems!
07-25-2007, 08:52 PM
#1
Senior Member
SuperBike
Thread Starter
Join Date: Mar 2007
Location: Belgium, WI
Posts: 1,611
I got problems!
So, it doesn't concern me greatly, but... After doing my undertail exhaust, I have been having what appears like a rich (or ignition misfire) stumble on hard throttle at 6500rpms. Why I say its rich is that the dyno sheet shows a remarkable drop in power and a dip in air fuel ratio. My question is if anyone else has had this problem???
I have run through the scenarios in my head, coil would continue to suck ***, same with spark plugs. I just can't think of a possible solution as of right now, that doesn't cost me of course.
I have run through the scenarios in my head, coil would continue to suck ***, same with spark plugs. I just can't think of a possible solution as of right now, that doesn't cost me of course.
07-26-2007, 06:34 PM
#3
Senior Member
Back Marker
Join Date: Dec 2006
Location: Palm Bay, FL
Posts: 247
6500 is a strange place to have a hiccup.... I see you have a drop-in.....stock airbox? Don't see why you'd have a rich dip at that particular rpm though there's something funny going on in the airbox like it's losing pressure
07-27-2007, 05:01 PM
#6
Senior Member
SuperBike
Thread Starter
Join Date: Mar 2007
Location: Belgium, WI
Posts: 1,611
I know what you are thinking, 17/43 gearin???? Yeah, so I could only get the sidewinder tri-metal in a 43 tooth and didn't want to loose the highway attitude so I bumped up the front a tooth. The ratio is a tidbit shorter, but hardly noticeable. Less wheelie happy, for sure. I shoulda done a 520. Oh well,
As for the jetting. Ok on the needles coming in at the point, but the problem is that we have it dialed in right no for AFR and don't want to dick with it. I just didn't know if anyone had experienced this problem. Also, i have a goofy undertail I built myself, so I think that may be part of the problem.
thanks,
Bill
As for the jetting. Ok on the needles coming in at the point, but the problem is that we have it dialed in right no for AFR and don't want to dick with it. I just didn't know if anyone had experienced this problem. Also, i have a goofy undertail I built myself, so I think that may be part of the problem.
thanks,
Bill
07-30-2007, 03:28 PM
#8
Senior Member
SuperBike
Thread Starter
Join Date: Mar 2007
Location: Belgium, WI
Posts: 1,611
the lengths of the exhaust will play a role in the wave tuning and could definitely cause hiccups in a carbed bike. Oh well, I think I am going to just keep beating it like a bad dog.
09-12-2007, 11:43 AM
#10
Senior Member
SuperBike
Thread Starter
Join Date: Mar 2007
Location: Belgium, WI
Posts: 1,611
Thought that this may shed some light on recent tuning questions. I lost one of my homemade endcaps to my homemade exhaust. This pretty much sucks, but the shop i was working at had a shifter cart exhaust end that would work with my diameter, yeaaaaah. But wait, it only had a 1" outlet, so I tried it and it completely fixed all my carb problems. The first time I went out I hit the rev limiter in first because it didn't hiccup at 6500 and lose power. NOT ENOUGH BACK PRESSURE, i say, so its getting equal sized outputs to help this, and quiet the bike overall. Boy I am happy.
Thread
Thread Starter
Forum
Replies
Last Post
