Vstar 1100 Front Cylinder Cutting Out
I bought a 2002 Vstar 1100 back in August of this year. It only had 4600 miles on it, and so it did quite a bit of sitting over the years. He told me he did not ride it at all for the past year. There was old gas in it, and old oil... When I first rode it, it was very smooth, rode very nicely, so I bought it. I rode it for a day with that old gas in it and the old oil (which was a bit low I will say), and by the end of the first day, the carb jets were clogged up due to that old gas (my mistake for not draining the old gas out)... I could not get the engine to go high RPMS at all because the jets were so clogged. I proceeded to take apart the carbs and cleaned them. I will make note that while cleaning them, there was a small part that popped out of one of the carbs (I have no idea where from and I can't find where to put it back, picture is posted in my reply below)... The main jets were clogged pretty good, as well as the other 2 jets. Got it all cleaned up, but I set the fuel mixture screws wrong, so I had a lot of popping at idle. Now here's the odd thing... At idle, the front cylinder was not firing... Would only fire after I got the RPMs up past maybe 2k (I don't have a tach, just guessing by sound), so that made for a very jolty ride getting started from a stop. Since I am not a mechanic by any means, I took it to my friend and he proceeded to take apart the carbs again and set the fuel mixture screws correctly (which got rid of the popping), and he also said that he tuned the carbs up to where they were supposed to be as far as the gas/air mix. He unfortunately was not able to fix the front cylinder not firing problem... We tried replacing the ignition coil (and spark plug wire) and that did not fix it. We swapped the spark plugs many times to no avail... We changed the air filter, fuel filter, changed the oil, still nothing... Here's the current state of the bike:
I start the bike up and let it warm up for a minute or two at idle (remember the front cylinder does not fire at all at idle). By this point, the front cylinder spark plug is fouled and if I take it for a ride, the front cylinder won't fire at all (no matter what speed or RPM). That pipe is literally cold to the touch and I can smell gas coming from it. After the bike has warmed up, I proceed to take out that front spark plug, give it a good brushing with a wire brush/rag, and then I put it back in the cylinder. Then I really crank on the bike going down the rode and the front cylinder slowly zaps back to life, but still only fires after getting the RPMs up to 2000 or so. If I let it idle for too long, the plug fouls again and I have to take it out and clean it with a wire brush. I have confirmed that I am getting a constant spark at all RPMs by taking out the spark plug and letting it hang from the engine and seeing it spark to the frame (or any point that is grounded), so I don't believe this problem is electrical. I believe that leaves perhaps a few things... Compression of the engine (but it's only 5500 miles at this point), timing, or maybe my friend did not tune the carbs correctly and the front is just really too rich all the time? Any feedback would be well appreciated!!!
Last edited by Chris Poullas; 10-04-2018 at 04:20 PM.