Tieftoener

Hey folks, Thanks again for all your help. I only got one notification for randya's post, so I'm just now getting to see all the other help flooding my way Unfortunately, the bike is in storage far away (100 miles) so getting to it is a pain. I did get to go on Tuesday and managed to get the air box off to get at the TCI. What a pain... (my first time). I pulled both connectors off and inspected them. I'm an Avionics Engineer, dealing with daily with $700 connectors and $5/ft wires... It was all I could do not to rip all the wires off the entire bike and start from scratch. 25 years have aged things extensively... There were a few corroded contacts, but after some investigation and scraping, I was able to make decent connections to things with my probe/meter. For what its worth, operating temperature of the bike makes no difference. I rode two-up with my wife two weekends ago on about a 100 mile (round trip) road trip. It was reliably consistent with my calibrated hand at "moderate" throttle. Dead cold or completely heat soaked - consistent results. I incidentally found the Barometric Pressure Sensor, based on George's description. I was unable to disconnect it. The fuse block has indeed been on my list of things to upgrade... I was just trying to find a reason to do it since the bike was working (if it ain't broke, don't fix it mentality). Well, looks like you guys have given me PLENTY to work on and investigate. Thank you so much for everything. I'll keep everyone posted as I make progress. 1 question though - when I pulled the air box off, I was trying to trace the spark plug wires back to the coil(s). The wires disappeared under the fairing frame. Where are they (plural?) located, and what's the easiest way to get to them? Regards, Scott

Hello all, Thanks in advance for your help. I've got an '84 XVZ1200. I've owned it about 3 years. This season, it started doing something weird the 3rd or 4th time I had it out. As a result, I haven't been able to ride much this year. It's taken me a few rides to get things narrowed down, as it was fairly intermittent. When: Under light acceleration, no problems. Under moderate acceleration, it happens occasionally in 1st and 2nd. Under heavy acceleration, it happens repeatedly during acceleration through 3rd gear. I have eventually narrowed it down to a position of the throttle. "What" happens: I describe it as a lurch. Although, the lurch is the result of the engine dying for a split second, followed by a quick rebound when it starts going again. When I say the engine dies, I mean all 4 cylinders loose power (not a gradual power lag). My initial guess was fuel starvation, perhaps from gummed up jets, etc in the carb. But, after running 2 tanks with half a can of Sea Foam each, there was no change whatsoever. (I understand Sea Foam won't fix everything for sure... it may well be clogged.) I then started to rule this out because of discovering the quick, repeated jolts under hard acceleration later on (see below for "speed"). As a result, I started leaning towards an ignition problem. Its as if the coil(s) run out of spark. What strikes me as weird is that if I run the RPM's up slowly, I can get it to redline without a problem... the engine runs normal all the way up. So, it seems as if ignition is working OK under load (at high RPM). So, this brings me back to a fuel problem. Are there accelerator pumps in these carbs that might be failing (I assume not)? I'm still surprised that the fuel could "recover" if there is a momentary starvation so quickly with the speed of repeated jolts. To give you an idea of the "speed" of these jolts: If I rail on the throttle, I would guess it gets as "violent" as 4 times per second in the 2000-5000 RPM range, and weaning off to 1 time per second nearing redline. Does anyone have any idea what this could be? Many thanks in advance for your help! Regards, Scott

Thanks so much for posting your experience! It's great to have some empirical data for comparison rather than just opinions. Regards, Scott