| Author | Message | ||
     Shazam |
Overheating front cyl. headpipe on my Nallins 1200cc XB9 The XB is 100% back together, Right now it is sporting a 12 headpipe and a Latus slip-on. However, I still have a bit of a problem. Upon completing reassembly of the motor, I started the bike to listen for any signs of a problem, and amazingly everything sounded OK, alot quieter than the Force pipe set-up to be sure. I am pretty pleased with the looks of this set-up due to the sleeper image it gives the bike. I checked all the fluids and warmed the bike, I then took it for a quick spin around the block. I pull back into the garage to check fluids again. I put the bike back on the stand start it up again to let it warm fully, time to crack open a beer and celebrate. then I notice it...... the headpipe off the front cylinder is slowly turning red. followed by something like this: shut the bike off, finish beer open another, ponder questions, drink beer, re-think PCIII functionality as I understand it, drink another beer, bike is now cold, start bike again, sure enough front pipe is turning red! shut bike off, grabs another beer, turns light off and leaves garage! I didn't do any work on the front cyl. during this teardown. So here's my possible problem/s: 1. a clogged injector 2. injector possibly not plugged in fully(unlikely) 3. a pinched fuel line 4. PCIII issues..... not running proper map???? I don't remember where in the RPM range the PC starts affecting fuel delivery. or if it retains it's mapping through a prolonged power outage. I distinctly remember that it doesn't do anything to alter idle? hmmmm? maybe I plugged the injctors in opposite cylinders and they are out of time with the motor(possible yet would be symptomatic at both cyl's right?). I will have to make some phone calls for this Q. and check my wiring again. 5. It's also occurred to me that the different headpipe and can may have some sort of wierd reversion characteristic that is causing pressure waves off the rear cylinder to hinder evacuation of the front. but I really don't think so? 6. It's also possible I guess, that the bike WILL run extremely lean at idle due to the bigger bore and standard fuel delivery and I just didn't notice it with the ceramic header. 7. leaking exhaust port gasket? or intake gasket? just thought of this one! will check this tonight. anybody got any ideas before I start wasting the professionals time? I will be out of town and unable to read replys or tinker for the next few days so think about it and comment if you like. thanks Sam | ||
| Timbo |
Hi Sam, First thing I would look for would be an intake leak on the front jug. Start with the easy/simple things first. Just curious, have you been checking the rear jug exhaust as well? Could it be an overall lean condition? Have you read your plugs? Timbo | ||
| Shazam |
Rear jug looks fine/ normal discoloring... I haven't done a damn thing since this episode a week and a half ago, will be digging into it a little tonight. I will check the plugs as well. | ||
| Pammy |
Having the timing retarded too much will turn the pipes red quicker than anything. | ||
| Buellicious |
If it was the injectors there would be spitting and sputtering around 3500 and a wicked flat spot from 3500 to 4500. I had switched the injectors when I took the headers off |
