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Old 12-02-2010, 07:31 AM
TADracer TADracer is offline
XS-XJ Guru
Join Date: May 2006
Location: Kenner, Louisiana USA
Posts: 1,415
Did a bit of tweaking

It is getting cold here around New Orleans. I know, cold is relative and the 40's we have been having here might seem balmy to some of you guys up North. But I ride year round so I use a two spark plug system to help keep my motor temp where it likes it.

I decided to switch to my hotter plugs and while checking things out I noticed that when the throttle is cracked open the timing plate bounced back and forth a bit before it started a smooth advance. I put on my timing light and in that 'shake zone' the timing was all over the place. I took a ride with the cover off and it did the same thing under load. I did not notice this before so I figured that sone adjustment should be done here.

I took an old pilot jet (one of the funky ones from a K&L carb kit that dont work) and then put two layers of shrink tube around the body of it to make it want to fit tight inside the vacuum tube from the carbs and to close off the holes in the side of the jet leaving only the small hole in the end open. Then I shoved it about an inch into the tube at the dashpot end and gave it a try.

With the jet restricting the vacuum pulses in the line the advance now works smoothly throughout the range and elimated the 'shake zone' on the timing. I don't really notice any difference in rideability when just off idle when the bouncing was happening but I figure that concerning timing, smooth is better than rough.

The more I ride with these carbs the more love them and I would recommend them for someone looking for an easy and reliable upgrade from the 30 year old OEM carbs.
Mike Giroir
79 XS-1100 Special

Once you un-can a can of worms, the only way to re-can them is with a bigger can.