Clean Carbs But Still No Love

Finally had a chance to button up all the carbs and get the pack rebuilt.  My attempts to fix the stripped air mixture screw all went poorly, so ultimately I picked up a replacement off of Ebay and cleaned it up.  Things are looking pretty clean and came together quite well.

Clean Carb, Bottom Clean Carb, Throttle Clean Carb, Choke

Placing the carbs back on the bike went pretty well and I just had to test it.  I put some fuel in and checked for leaks; happily everything seemed to be holding pretty well.  Started up the engine (with my fingers crossed) and things fired up, but still having issues with carbs 3 and 4.  Doing a temperature test at the headers, cylinders 1 and 2 read around 250+ degrees F while cylinder 4 was at 83 degrees F.  Not good.

After stepping back and trying to figure out the next plan, I decided to go ahead and revisit the compression and ignition.  To rule out “no spark” problems, I went ahead and did an ignition test as well as a spark test; both seemed to pass for all for spark plugs.  Pulling them I did notice that cylinder 3 and 4 were both “wet” compared to 1 and 2.

Spark Plugs

Next up was the compression test.  The Clymer manual says to try a normal compression test (crank the engine a few times) and a wet compression test (add a tablespoon of oil to the cylinder and retry the compression test).  I found the following:

Cylinder Dry Compression (psi) Wet Compression (psi)
1 120 210
2 97.5 270
3 105 150
4 97.5 165

 
The low compression readings seem to be within reason (the Clymer manual says that ~100psi is good enough to get the engine going), but the worry is that with the additional oil, cylinders 3 and 4 didn’t significantly change.  This could point back to needing to finish the valve shim adjustment I mentioned in an earlier post.  Perhaps in doing that I can correct some of these compression issues.  To do so, I’ll need to order the following 25mm valve shims:

Shim Thickness Number
2.6 2
2.65 5
2.7 5
2.75 1
2.8 1
2.85 1

 
After putting all the spark plugs and re-wiring, I decided to fire the bike up one more time (this time with the oil still in the cylinders).  I expected quite a bit of smoke, which is what I got, but was also pleasantly surprised to notice all 4 cylinders seemed to be firing.  Seems the added compression from the oil has helped a bit; furthering the idea that the next step is to finish the valve adjustment.

Comments (1)

  1. 10:00 am, July 12, 2013faber 

    When you reinstalled the plugs did you use dielectric grease in the plug caps to ensure good connection? It’s possible that there may have been a slight connection issue before that was remedied when you re-plugged everything.

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