Topic: Ignition timing question

[guitarkev66]

Ok, I set the timing on my K1 cb750 with a timing light.  with the idle set at about 1000rpm's I hooked up my timing light to #4 and adjusted the F mark so it was in the middle of the groove, repeated the same on #3.  After doing so it feels like my timing is too far advanced.  Should I set the advance adjustment on the timing light to a certain degree before timing?  The reason I feel like it is too advanced is I have good power at the low and mid range but it feels flat at Higher rpm's.  (I have the valves adjusted, carbs synced, and points gapped at 0014)

[grcamna2]

Kev,
   Did you set the Advance also? It's the Best way to first set the timing on the mark at the lower rpm's like you have and then progressively turn the rpm's up and keep a steady hand until you reach the full advance marks on your advancer possibly around 3200 rpm's?
  It's always a good idea to remove your points plate and then remove your advance unit from the shaft and service it;I would do that first! before you even start to set the timing.There are other folks on here that will tell you how and other threads on how to service the advance unit properly  . with special regard to smooth free movement of the slightly greased center cam on it's pivot shaft & the correct shim clearance...and take up the tension a bit on the 2 springs to get them to spec.;they may have stretched over the years...

[jonboycox]

  I ran into this same problem using a "dial back" timing light on my 400f as well. I think that with a dial back you need to time to the "T" instead of the "F".  I spent $20 and got a brand new non-dial timing light and it worked like a charm, put the bike in the right power range using the "F" mark. Somehow setting the dial at zero is not the same as using a non-dial light.

[Spanner 1]

Timing @ the F mark with the bike running at say 1100 rpm is a bit dodgy as the advancer may be already turning off it's stop.... I always time statically at the F mark and then hook-up the timing light to check the full advance marks, which should appear on a K1 about 2,300 rpm 
Also +1 on checking the advancer for free movement.... it may be stuck 'open' and give you a false F mark.

[guitarkev66]

Great information Guys I really appreciate it!!!  I will give all that a try.  Thank You....

[ekpent]

As Spanner mentioned learn how to do a static timing also,its easy and the bike does not even have to be running.You will than be able to compare the two methods for fine tuning or to see if your light is off.