She keeps getting better, but still not there

[stng_96]

Hey guys, my 1000 is coming along, but still has a few issues. I have gotten a lot of good information from this site, that has really made a HUGE difference. Now granted, the stock airbox I found is not here yet, neither is my carbtune, so I haven't got everything squared away, however I do have a general question or two.

First, after bench syncing my carbs, setting the mix screws out 2.5 turns, and adding new intake boot o-ring, her idle is down to a normal level, what a relief. That being said, my problems right now are this. No fire on cyl 4, and one of the carbs is still backfiring alot, i am not sure, but Its either 3 or 4, leaning to four because of the no fire on that cylinder. What do you guys think this could be. It backfires a LOT when I try to rev it. I know its getting spark to the plug, because I could feel it in my hand when I pulled the wire off with no change , haha.

On a side note, at low rpms (800-1200 or so) there is a nasty rattle coming from what sounds like the back of the motor, but it clears COMPLETELY after those low rpms, any takers?

[Big T]

It will backfire until you put the airbox on and seal it up, it's running lean


#4 may need the ignition wire trimmed and a new cap

That horrible noise is probably the cam chain tensioner needing service

[stng_96]

Cam chain tensioner, hmmm, Ill have to read into that. Adjustable, or just replace?

[mike_of_bbg]

Not really adjustable (you can put more spring tension on the outside knob), but certainly rebuildable.

http://www.bwringer.com/gs/camchaintens.html

Make sure you read and understand what all the parts of that do before you go touching it - particularly if the motor is running! Do not turn the knob counter-clockwise unless the unit is locked! On mine when it was noisy I could look at the knob and see it shaking. It needed more spring tension, but I went ahead and did the full rebuild. It's about $10 in parts, and I shouldn't have to worry about weeps/leaks from it for another 20 years.