Went out for a ride to a mate's. Bike was running sweetly as it always has. When I was heading back home, the bike had been sitting for about 3 hours, I noticed the bike was all of a sudden idling at 1k, even when warm. It has previously always idled at 2k (high, I know).
Furthermore, there is a lot of popping coming from the exhaust on deceleration. Something that only used to happen lightly when decelerating from very high rpms. It seems this popping happens pretty much whenever I decel now.
It's on small throttle opening when the bike seems really 'hesitant' and seems to run a lot better when opened up a bit. Also, I'm not 100% on this, but when idling it may be running on one cylinder (is there anyway I can check?)
As of now I am thinking it might be a clogged pilot jet? What do you guys think? What should I be checking?
Intake leak ??? exhaust leak ??? yea you can lose 1 cyl - especially if the vacuum cap on that side blows, or even if the intake leak is bad enough.
Does the bike make more raspy noise ??? Then definitely one of those.
Cool.
Buddha.
I would check your spark plugs. One of them not sparking could cause you to only run on one cylinder, and could create the symptoms you're describing. The popping in the exhaust could be the unburnt fuel from the non-firing cylinder getting into the exhaust and exploding there rather than in the cylinder.
Also, check for vacuum and/or exhaust leaks, like Buddha said.
Quote from: qcbaker on September 27, 2016, 07:29:03 AM
I would check your spark plugs. One of them not sparking could cause you to only run on one cylinder, and could create the symptoms you're describing. The popping in the exhaust could be the unburnt fuel from the non-firing cylinder getting into the exhaust and exploding there rather than in the cylinder.
Also, check for vacuum and/or exhaust leaks, like Buddha said.
ETA: could have something to do with the pilot jet, check that for clogs if the spark plugs look okay.
I'm on break now, finally got around to looking at the bike. Got her started again, same problem. Took out the spark plugs, one was fine, the other seemed to have carbon fouling. Similar to this picture:
http://imgur.com/a/8L4U3
According to haynes, that cylinder is running too rich. What could be causing this? I'm still pretty lost, on how to go forward.
Cheers.
With fouling of 1 cylinder, I might think the carb on that side has a stuck or fouled float needle allowing in too much fuel?
Quote from: Arpee on December 21, 2016, 08:59:54 PM
With fouling of 1 cylinder, I might think the carb on that side has a stuck or fouled float needle allowing in too much fuel?
This would be my guess as well. That's probably the most likely scenario.
Ahh great, thanks for the replies.
Had the carbs out to have a look anyway. Having problems with screws even with a JIS screwdriver >:(.
Will report back, after findings/adjustments. :thumb:
The carb screws are notoriously soft. I believe the common advice around here is to replace them with some allen head ones.